Ganti Nama APP

This reverts commit 30298ac46eb71830a59cba5ae494fb12e3c2121d.

.idea/deploymentTargetSelector.xml

@@ -4,6 +4,14 @@
     <selectionStates>
       <SelectionState runConfigName="app">
         <option name="selectionMode" value="DROPDOWN" />
+        <DropdownSelection timestamp="2025-11-17T09:59:25.576794100Z">
+          <Target type="DEFAULT_BOOT">
+            <handle>
+              <DeviceId pluginId="LocalEmulator" identifier="path=C:\Users\Fazri Abdurrahman\.android\avd\Medium_Phone.avd" />
+            </handle>
+          </Target>
+        </DropdownSelection>
+        <DialogSelection />
       </SelectionState>
     </selectionStates>
   </component>

.idea/deviceManager.xml

@@ -5,7 +5,7 @@
       <list>
         <ColumnSorterState>
           <option name="column" value="Name" />
-          <option name="order" value="ASCENDING" />
+          <option name="order" value="DESCENDING" />
         </ColumnSorterState>
       </list>
     </option>

app/build.gradle.kts

@@ -80,4 +80,18 @@ dependencies {
     // ViewModel & Lifecycle
     implementation("androidx.lifecycle:lifecycle-viewmodel-compose:2.7.0")
     implementation("androidx.lifecycle:lifecycle-runtime-compose:2.7.0")
+
+    // Retrofit untuk HTTP requests
+    implementation("com.squareup.retrofit2:retrofit:2.9.0")
+    implementation("com.squareup.retrofit2:converter-gson:2.9.0")
+
+    // OkHttp untuk logging
+    implementation("com.squareup.okhttp3:okhttp:4.12.0")
+    implementation("com.squareup.okhttp3:logging-interceptor:4.12.0")
+
+    // Gson
+    implementation("com.google.code.gson:gson:2.10.1")
+
+    // PDFBox untuk extract text dari PDF
+    implementation("com.tom-roush:pdfbox-android:2.0.27.0")
 }

app/src/main/AndroidManifest.xml

@@ -2,6 +2,13 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools">
 
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"
+        android:maxSdkVersion="32" />
+    <uses-permission android:name="android.permission.READ_MEDIA_IMAGES" />
+    <uses-permission android:name="android.permission.READ_MEDIA_VIDEO" />
+    <uses-permission android:name="android.permission.READ_MEDIA_AUDIO" />
+    <uses-permission android:name="android.permission.INTERNET" />
+
     <application
         android:allowBackup="true"
         android:dataExtractionRules="@xml/data_extraction_rules"
@@ -11,6 +18,17 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.Notebook">
+
+        <provider
+            android:name="androidx.core.content.FileProvider"
+            android:authorities="${applicationId}.fileprovider"
+            android:exported="false"
+            android:grantUriPermissions="true">
+            <meta-data
+                android:name="android.support.FILE_PROVIDER_PATHS"
+                android:resource="@xml/file_paths" />
+        </provider>
+
         <activity
             android:name=".MainActivity"
             android:exported="true"

app/src/main/java/com/example/notebook/api/ApiConstants.kt

@@ -0,0 +1,88 @@
+package com.example.notebook.api
+
+object ApiConstants {
+
+    // API KEY GEMINI (GOOGLE AI STUDIO)
+    const val GEMINI_API_KEY = "AIzaSyCVYFUMcKqCDKN5Z_vNwT2Z4VHgjJ5V7dI"
+
+    // Endpoint Gemini API
+    const val BASE_URL = "https://generativelanguage.googleapis.com/"
+
+    // Model yang digunakan (Flash = gratis & cepat)
+    const val MODEL_NAME = "gemini-2.0-flash"
+
+    // System instruction untuk AI nya
+    const val SYSTEM_INSTRUCTION = """
+        Anda adalah AI assistant yang membantu pengguna memahami dokumen mereka dengan lebih baik.
+        
+        KARAKTERISTIK ANDA:
+        - Ramah, sabar, dan edukatif
+        - Memberikan penjelasan yang mudah dipahami
+        - Menggunakan contoh konkret dari dokumen pengguna
+        - Proaktif dalam memberikan insight tambahan yang relevan
+        
+        CARA KERJA ANDA:
+        
+        1. **Untuk pertanyaan langsung tentang isi dokumen:**
+           - Jawab berdasarkan informasi dari dokumen
+           - Kutip atau parafrase bagian relevan
+           - Berikan konteks tambahan jika membantu pemahaman
+        
+        2. **Untuk pertanyaan konseptual yang terkait dengan topik dokumen:**
+           - Jelaskan konsep dengan bahasa sederhana
+           - Hubungkan dengan contoh spesifik dari dokumen
+           - Format: "Secara umum, [konsep] adalah [penjelasan]. Dalam dokumen Anda, hal ini terlihat pada [contoh spesifik dari dokumen]."
+        
+        3. **Untuk pertanyaan yang memerlukan analisis atau perbandingan:**
+           - Berikan analisis yang informatif
+           - Gunakan pengetahuan umum untuk konteks
+           - Selalu kaitkan kembali dengan isi dokumen
+           - Tunjukkan bagaimana konsep umum diterapkan dalam dokumen
+        
+        4. **Untuk pertanyaan definisi atau istilah:**
+           - Berikan definisi yang jelas dan akurat
+           - Jelaskan dengan bahasa yang mudah dipahami
+           - Tambahkan: "Dalam konteks dokumen Anda tentang [topik], istilah ini merujuk pada [penjelasan spesifik]..."
+        
+        5. **Untuk pertanyaan yang sama sekali tidak terkait:**
+           - Sampaikan dengan sopan bahwa pertanyaan di luar topik dokumen
+           - Berikan ringkasan singkat topik dokumen
+           - Tawarkan untuk membahas topik dalam dokumen
+        
+        PRINSIP MENJAWAB:
+        ✓ Prioritaskan informasi dari dokumen pengguna
+        ✓ Gunakan pengetahuan umum untuk memperkaya pemahaman
+        ✓ Selalu hubungkan konsep umum dengan contoh dari dokumen
+        ✓ Jelas membedakan mana dari dokumen vs pengetahuan umum
+        ✓ Gunakan format markdown untuk struktur yang jelas
+        ✓ Berikan jawaban yang komprehensif tapi tidak bertele-tele
+        
+        GAYA KOMUNIKASI:
+        - Bahasa Indonesia yang natural dan profesional
+        - Hindari jargon kecuali diperlukan (dengan penjelasan)
+        - Gunakan bullet points, numbering, bold untuk readability
+        - Friendly tapi tetap informatif
+        
+        FORMAT TABEL:
+        Untuk perbandingan atau data tabular, gunakan markdown table:
+        | Fitur      | Algoritma A | Algoritma B |
+        |------------|-------------|-------------|
+        | Akurasi    | 95%         | 92%         |
+        | Kecepatan  | Cepat       | Sedang      |
+        
+        CONTOH INTERAKSI:
+        
+        User: "Apa itu algoritma supervised learning?"
+        Good: "Supervised learning adalah pendekatan machine learning dimana model belajar dari data yang sudah diberi label. **Berdasarkan dokumen Anda**, beberapa contoh algoritma supervised learning yang dibahas adalah:
+        - **Naive Bayes**: Algoritma klasifikasi berbasis probabilitas
+        - **Decision Tree**: Menggunakan struktur pohon untuk keputusan
+        - **K-NN**: Klasifikasi berdasarkan kedekatan dengan data tetangga
+        
+        Ketiga algoritma ini termasuk supervised learning karena menggunakan data training yang sudah memiliki label kelas."
+        
+        User: "Berapa akurasi terbaik yang bisa dicapai?"
+        Good: "Berdasarkan dokumen Anda, akurasi terbaik dicapai oleh algoritma Random Forest dengan hasil [X]%. Namun, perlu diingat bahwa akurasi optimal bergantung pada beberapa faktor seperti kualitas data, feature engineering, dan parameter tuning yang digunakan."
+        
+        Selamat membantu pengguna! 🚀
+    """
+}

app/src/main/java/com/example/notebook/api/GeminiApiService.kt

@@ -0,0 +1,48 @@
+package com.example.notebook.api
+
+import okhttp3.OkHttpClient
+import okhttp3.logging.HttpLoggingInterceptor
+import retrofit2.Response
+import retrofit2.Retrofit
+import retrofit2.converter.gson.GsonConverterFactory
+import retrofit2.http.Body
+import retrofit2.http.POST
+import retrofit2.http.Query
+import java.util.concurrent.TimeUnit
+
+/**
+ * Retrofit interface untuk Gemini API
+ */
+interface GeminiApiService {
+
+    @POST("v1beta/models/gemini-2.0-flash:generateContent")
+    suspend fun generateContent(
+        @Query("key") apiKey: String,
+        @Body request: GeminiRequest
+    ): Response<GeminiResponse>
+
+    companion object {
+        fun create(): GeminiApiService {
+            // Logger untuk debug
+            val logger = HttpLoggingInterceptor().apply {
+                level = HttpLoggingInterceptor.Level.BODY
+            }
+
+            // HTTP Client
+            val client = OkHttpClient.Builder()
+                .addInterceptor(logger)
+                .connectTimeout(60, TimeUnit.SECONDS)
+                .readTimeout(60, TimeUnit.SECONDS)
+                .writeTimeout(60, TimeUnit.SECONDS)
+                .build()
+
+            // Retrofit instance
+            return Retrofit.Builder()
+                .baseUrl(ApiConstants.BASE_URL)
+                .client(client)
+                .addConverterFactory(GsonConverterFactory.create())
+                .build()
+                .create(GeminiApiService::class.java)
+        }
+    }
+}

app/src/main/java/com/example/notebook/api/GeminiModels.kt

@@ -0,0 +1,105 @@
+package com.example.notebook.api
+
+import com.google.gson.annotations.SerializedName
+
+/**
+ * Request model untuk Gemini API
+ */
+data class GeminiRequest(
+    @SerializedName("contents")
+    val contents: List<Content>,
+
+    @SerializedName("generationConfig")
+    val generationConfig: GenerationConfig? = null,
+
+    @SerializedName("systemInstruction")
+    val systemInstruction: SystemInstruction? = null
+)
+
+data class Content(
+    @SerializedName("parts")
+    val parts: List<Part>,
+
+    @SerializedName("role")
+    val role: String = "user"
+)
+
+data class Part(
+    @SerializedName("text")
+    val text: String? = null,
+
+    @SerializedName("inlineData")
+    val inlineData: InlineData? = null
+)
+
+data class InlineData(
+    @SerializedName("mimeType")
+    val mimeType: String,
+
+    @SerializedName("data")
+    val data: String  // Base64 encoded
+)
+
+data class GenerationConfig(
+    @SerializedName("temperature")
+    val temperature: Double = 0.7,
+
+    @SerializedName("maxOutputTokens")
+    val maxOutputTokens: Int = 2048,
+
+    @SerializedName("topP")
+    val topP: Double = 0.95
+)
+
+data class SystemInstruction(
+    @SerializedName("parts")
+    val parts: List<Part>
+)
+
+/**
+ * Response model dari Gemini API
+ */
+data class GeminiResponse(
+    @SerializedName("candidates")
+    val candidates: List<Candidate>?,
+
+    @SerializedName("error")
+    val error: ApiError? = null
+)
+
+data class Candidate(
+    @SerializedName("content")
+    val content: Content,
+
+    @SerializedName("finishReason")
+    val finishReason: String?,
+
+    @SerializedName("safetyRatings")
+    val safetyRatings: List<SafetyRating>?
+)
+
+data class SafetyRating(
+    @SerializedName("category")
+    val category: String,
+
+    @SerializedName("probability")
+    val probability: String
+)
+
+data class ApiError(
+    @SerializedName("code")
+    val code: Int,
+
+    @SerializedName("message")
+    val message: String,
+
+    @SerializedName("status")
+    val status: String
+)
+
+/**
+ * Helper untuk extract text dari response
+ */
+fun GeminiResponse.getTextResponse(): String? {
+    return candidates?.firstOrNull()?.content?.parts?.firstOrNull()?.text
+}

app/src/main/java/com/example/notebook/api/GeminiRepository.kt

@@ -0,0 +1,379 @@
+package com.example.notebook.api
+
+import kotlinx.coroutines.delay
+
+/**
+ * Repository untuk handle Gemini API calls
+ */
+class GeminiRepository {
+
+    private val apiService = GeminiApiService.create()
+
+    // Retry configuration
+    private val maxRetries = 3
+    private val initialDelayMs = 2000L // 2 seconds
+
+    // Helper function untuk retry dengan exponential backoff
+    private suspend fun <T> retryWithBackoff(
+        maxAttempts: Int = maxRetries,
+        initialDelay: Long = initialDelayMs,
+        factor: Double = 2.0,
+        block: suspend () -> T
+    ): T {
+        var currentDelay = initialDelay
+        repeat(maxAttempts - 1) { attempt ->
+            try {
+                return block()
+            } catch (e: Exception) {
+                println("⚠️ Attempt ${attempt + 1} failed: ${e.message}")
+
+                // Jika error bukan 429, langsung throw
+                if (e.message?.contains("429") != true) {
+                    throw e
+                }
+
+                println("⏳ Waiting ${currentDelay}ms before retry...")
+                delay(currentDelay)
+                currentDelay = (currentDelay * factor).toLong()
+            }
+        }
+        return block() // Last attempt
+    }
+
+    //Generate summary dengan retry logic
+    suspend fun generateSummary(text: String): Result<String> {
+        return try {
+            retryWithBackoff {
+                val prompt = """
+                    Buatlah ringkasan yang komprehensif dari dokumen berikut dalam bahasa Indonesia.
+                    Ringkasan harus:
+                    - Mencakup poin-poin utama
+                    - Mudah dipahami
+                    - Panjang sekitar 3-5 paragraf
+                    
+                    Dokumen:
+                    $text
+                """.trimIndent()
+
+                val request = createRequest(prompt)
+                val response = apiService.generateContent(ApiConstants.GEMINI_API_KEY, request)
+
+                if (response.isSuccessful) {
+                    val body = response.body()
+                    val textResponse = body?.getTextResponse()
+
+                    if (textResponse != null) {
+                        return@retryWithBackoff Result.success(textResponse)
+                    } else {
+                        throw Exception("Empty response from API")
+                    }
+                } else {
+                    val errorBody = response.errorBody()?.string()
+                    when (response.code()) {
+                        429 -> throw Exception("API Error 429: Rate limit exceeded. Retrying...")
+                        else -> throw Exception("API Error: ${response.code()} - $errorBody")
+                    }
+                }
+            }
+        } catch (e: Exception) {
+            // User-friendly error messages
+            val friendlyMessage = when {
+                e.message?.contains("429") == true ->
+                    "Quota API Gemini habis. Silakan tunggu beberapa menit atau upgrade ke paid plan."
+                e.message?.contains("401") == true ->
+                    "API Key tidak valid. Periksa konfigurasi API Key Anda."
+                e.message?.contains("Network") == true ->
+                    "Tidak ada koneksi internet. Periksa koneksi Anda."
+                else -> "Error: ${e.message}"
+            }
+            Result.failure(Exception(friendlyMessage))
+        }
+    }
+
+    // Generate summary dari PDF dengan retry logic
+    suspend fun generateSummaryFromPdfFile(
+        filePath: String,
+        fileName: String
+    ): Result<String> = kotlinx.coroutines.withContext(kotlinx.coroutines.Dispatchers.IO) {
+        try {
+            retryWithBackoff {
+                println("📄 Reading PDF file: $filePath")
+                val file = java.io.File(filePath)
+
+                val fileSizeMB = file.length() / (1024.0 * 1024.0)
+                if (fileSizeMB > 20) {
+                    throw Exception("File terlalu besar (${String.format("%.2f", fileSizeMB)} MB). Maksimal 20MB")
+                }
+
+                val bytes = file.readBytes()
+                val base64 = android.util.Base64.encodeToString(bytes, android.util.Base64.NO_WRAP)
+
+                val prompt = """
+                    Buatlah ringkasan komprehensif dari dokumen PDF ini dalam bahasa Indonesia.
+                    Ringkasan harus:
+                    - Mencakup semua poin-poin utama
+                    - Mudah dipahami
+                    - Panjang sekitar 3-5 paragraf
+                    
+                    File: $fileName
+                """.trimIndent()
+
+                val request = GeminiRequest(
+                    contents = listOf(
+                        Content(
+                            parts = listOf(
+                                Part(text = prompt),
+                                Part(
+                                    inlineData = InlineData(
+                                        mimeType = "application/pdf",
+                                        data = base64
+                                    )
+                                )
+                            ),
+                            role = "user"
+                        )
+                    ),
+                    generationConfig = GenerationConfig(
+                        temperature = 0.7,
+                        maxOutputTokens = 2048,
+                        topP = 0.95
+                    ),
+                    systemInstruction = SystemInstruction(
+                        parts = listOf(Part(text = ApiConstants.SYSTEM_INSTRUCTION))
+                    )
+                )
+
+                val response = apiService.generateContent(ApiConstants.GEMINI_API_KEY, request)
+
+                if (response.isSuccessful) {
+                    val body = response.body()
+                    val textResponse = body?.getTextResponse()
+                    if (textResponse != null) {
+                        return@retryWithBackoff Result.success(textResponse)
+                    } else {
+                        throw Exception("Empty response from API")
+                    }
+                } else {
+                    val errorBody = response.errorBody()?.string()
+                    when (response.code()) {
+                        429 -> throw Exception("API Error 429: Rate limit exceeded. Retrying...")
+                        else -> throw Exception("API Error: ${response.code()} - $errorBody")
+                    }
+                }
+            }
+        } catch (e: Exception) {
+            val friendlyMessage = when {
+                e.message?.contains("429") == true ->
+                    "Quota API Gemini habis. Silakan tunggu beberapa menit atau upgrade ke paid plan."
+                e.message?.contains("401") == true ->
+                    "API Key tidak valid. Periksa konfigurasi API Key Anda."
+                else -> "Error: ${e.message}"
+            }
+            Result.failure(Exception(friendlyMessage))
+        }
+    }
+
+
+     // Chat dengan document - dengan retry logic
+    suspend fun chatWithDocument(
+        userMessage: String,
+        documentContext: String,
+        chatHistory: List<Pair<String, String>> = emptyList()
+    ): Result<String> {
+        return try {
+            retryWithBackoff {
+                val promptBuilder = StringBuilder()
+
+                promptBuilder.append("""
+                    KONTEKS DOKUMEN PENGGUNA:
+                    $documentContext
+                    
+                    ---
+                    
+                """.trimIndent())
+
+                if (chatHistory.isNotEmpty()) {
+                    promptBuilder.append("RIWAYAT PERCAKAPAN:\n")
+                    chatHistory.takeLast(5).forEach { (user, ai) ->
+                        promptBuilder.append("User: $user\n")
+                        promptBuilder.append("Assistant: $ai\n\n")
+                    }
+                    promptBuilder.append("---\n\n")
+                }
+
+                promptBuilder.append("PERTANYAAN SAAT INI:\n$userMessage\n\n")
+
+                promptBuilder.append("""
+                    PANDUAN MENJAWAB:
+                    
+                    1. **PRIORITASKAN informasi dari dokumen di atas** untuk menjawab pertanyaan.
+                    
+                    2. **JIKA pertanyaan terkait dengan topik dokumen** TETAPI membutuhkan penjelasan konsep umum:
+                       - Jelaskan konsep tersebut dengan jelas
+                       - Hubungkan dengan contoh konkret dari dokumen
+                       - Gunakan format: "Berdasarkan dokumen Anda tentang [topik], [penjelasan konsep], dan dalam dokumen ini dijelaskan bahwa [contoh dari dokumen]..."
+                    
+                    3. **JIKA pertanyaan meminta perbandingan atau analisis** yang memerlukan pengetahuan luar dokumen:
+                       - Berikan analisis yang informatif
+                       - Selalu kaitkan kembali dengan isi dokumen
+                       - Contoh: "Secara umum [konsep], dan ini terlihat dalam dokumen Anda dimana [contoh spesifik]..."
+                    
+                    4. **JIKA pertanyaan tentang definisi atau konsep dasar** yang disebutkan di dokumen:
+                       - Berikan definisi yang jelas dan mudah dipahami
+                       - Tambahkan konteks dari dokumen: "Dalam dokumen Anda, [topik] dijelaskan sebagai [kutipan/parafrase]..."
+                    
+                    5. **JIKA pertanyaan meminta saran atau rekomendasi** berdasarkan dokumen:
+                       - Berikan saran yang konstruktif
+                       - Dasarkan pada informasi dari dokumen
+                       - Tambahkan insight tambahan jika relevan
+                    
+                    6. **JIKA pertanyaan SAMA SEKALI tidak terkait** dengan dokumen:
+                       - Jawab dengan sopan: "Pertanyaan Anda tentang [topik] tidak terkait dengan dokumen yang Anda upload. Dokumen Anda membahas tentang [ringkasan singkat topik dokumen]. Apakah Anda ingin bertanya tentang topik dalam dokumen ini?"
+                    
+                    GAYA BAHASA:
+                    - Gunakan bahasa Indonesia yang natural dan ramah
+                    - Jelaskan dengan cara yang mudah dipahami
+                    - Gunakan contoh konkret dari dokumen ketika relevan
+                    - Jika menggunakan istilah teknis, berikan penjelasan singkat
+                    - Gunakan format markdown untuk readability (bold, list, dll)
+                    
+                    FORMAT TABEL (jika diperlukan):
+                    Untuk data perbandingan atau tabel, gunakan format markdown table:
+                    | Header 1 | Header 2 | Header 3 |
+                    |----------|----------|----------|
+                    | Data 1   | Data 2   | Data 3   |
+                    | Data 4   | Data 5   | Data 6   |
+                    
+                    Jawab sekarang:
+                """.trimIndent())
+
+                val request = createRequest(promptBuilder.toString())
+                val response = apiService.generateContent(ApiConstants.GEMINI_API_KEY, request)
+
+                if (response.isSuccessful) {
+                    val body = response.body()
+                    val textResponse = body?.getTextResponse()
+                    if (textResponse != null) {
+                        return@retryWithBackoff Result.success(textResponse)
+                    } else {
+                        throw Exception("Empty response from API")
+                    }
+                } else {
+                    val errorBody = response.errorBody()?.string()
+                    when (response.code()) {
+                        429 -> throw Exception("API Error 429: Rate limit exceeded. Retrying...")
+                        else -> throw Exception("API Error: ${response.code()} - $errorBody")
+                    }
+                }
+            }
+        } catch (e: Exception) {
+            val friendlyMessage = when {
+                e.message?.contains("429") == true ->
+                    "⏳ Quota API habis. Coba lagi dalam beberapa menit atau upgrade ke paid plan."
+                e.message?.contains("401") == true ->
+                    "❌ API Key tidak valid. Periksa konfigurasi."
+                else -> "Error: ${e.message}"
+            }
+            Result.failure(Exception(friendlyMessage))
+        }
+    }
+
+
+    // Chat dengan PDF file - dengan retry logic
+
+    suspend fun chatWithPdfFile(
+        userMessage: String,
+        pdfFilePath: String,
+        pdfFileName: String,
+        chatHistory: List<Pair<String, String>> = emptyList()
+    ): Result<String> = kotlinx.coroutines.withContext(kotlinx.coroutines.Dispatchers.IO) {
+        try {
+            retryWithBackoff {
+                val file = java.io.File(pdfFilePath)
+                val fileSizeMB = file.length() / (1024.0 * 1024.0)
+
+                if (fileSizeMB > 20) {
+                    throw Exception("File terlalu besar (${String.format("%.2f", fileSizeMB)} MB). Maksimal 20MB")
+                }
+
+                val bytes = file.readBytes()
+                val base64 = android.util.Base64.encodeToString(bytes, android.util.Base64.NO_WRAP)
+
+                val promptBuilder = StringBuilder()
+                promptBuilder.append("DOKUMEN PDF: $pdfFileName\n\n")
+
+                if (chatHistory.isNotEmpty()) {
+                    promptBuilder.append("RIWAYAT PERCAKAPAN:\n")
+                    chatHistory.takeLast(5).forEach { (user, ai) ->
+                        promptBuilder.append("User: $user\n")
+                        promptBuilder.append("Assistant: $ai\n\n")
+                    }
+                    promptBuilder.append("---\n\n")
+                }
+
+                promptBuilder.append("PERTANYAAN SAAT INI:\n$userMessage\n\n")
+                promptBuilder.append("""
+                    PANDUAN MENJAWAB:
+                    
+                    1. **PRIORITASKAN informasi dari PDF** untuk menjawab pertanyaan.
+                    2. **JIKA pertanyaan terkait topik PDF** tetapi butuh penjelasan konsep:
+                       - Jelaskan konsep dengan jelas
+                       - Hubungkan dengan konten spesifik dari PDF
+                    3. Gunakan markdown untuk struktur (bold, list, tabel)
+                    
+                    FORMAT TABEL (jika diperlukan):
+                    | Header 1 | Header 2 | Header 3 |
+                    |----------|----------|----------|
+                    | Data 1   | Data 2   | Data 3   |
+                    
+                    Jawab sekarang:
+                """.trimIndent())
+
+                val request = GeminiRequest(
+                    contents = listOf(
+                        Content(
+                            parts = listOf(
+                                Part(inlineData = InlineData(mimeType = "application/pdf", data = base64)),
+                                Part(text = promptBuilder.toString())
+                            ),
+                            role = "user"
+                        )
+                    ),
+                    generationConfig = GenerationConfig(temperature = 0.7, maxOutputTokens = 2048, topP = 0.95),
+                    systemInstruction = SystemInstruction(parts = listOf(Part(text = ApiConstants.SYSTEM_INSTRUCTION)))
+                )
+
+                val response = apiService.generateContent(ApiConstants.GEMINI_API_KEY, request)
+
+                if (response.isSuccessful) {
+                    val textResponse = response.body()?.getTextResponse()
+                    if (textResponse != null) {
+                        return@retryWithBackoff Result.success(textResponse)
+                    } else {
+                        throw Exception("Empty response")
+                    }
+                } else {
+                    when (response.code()) {
+                        429 -> throw Exception("API Error 429: Rate limit exceeded. Retrying...")
+                        else -> throw Exception("API Error: ${response.code()}")
+                    }
+                }
+            }
+        } catch (e: Exception) {
+            val friendlyMessage = when {
+                e.message?.contains("429") == true ->
+                    "⏳ Quota API habis. Tunggu beberapa menit atau upgrade plan."
+                else -> "Error: ${e.message}"
+            }
+            Result.failure(Exception(friendlyMessage))
+        }
+    }
+
+    private fun createRequest(prompt: String): GeminiRequest {
+        return GeminiRequest(
+            contents = listOf(Content(parts = listOf(Part(prompt)), role = "user")),
+            generationConfig = GenerationConfig(temperature = 0.7, maxOutputTokens = 2048, topP = 0.95),
+            systemInstruction = SystemInstruction(parts = listOf(Part(ApiConstants.SYSTEM_INSTRUCTION)))
+        )
+    }
+}

app/src/main/java/com/example/notebook/data/AppDatabase.kt

@@ -7,7 +7,7 @@ import androidx.room.RoomDatabase
 
 /**
  * Database utama aplikasi
- * Version 1 = versi pertama database kamu
+ * Version 1 = versi pertama database
  */
 @Database(
     entities = [

app/src/main/java/com/example/notebook/data/DatabaseTest.kt

@@ -1,31 +0,0 @@
-package com.example.notebook.data
-
-import android.content.Context
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.launch
-
-/**
- * Helper untuk test database
- * Panggil fungsi ini dari MainActivity untuk test
- */
-class DatabaseTest(private val context: Context) {
-
-    private val database = AppDatabase.getDatabase(context)
-    private val dao = database.notebookDao()
-
-    fun testInsertNotebook() {
-        CoroutineScope(Dispatchers.IO).launch {
-            val testNotebook = NotebookEntity(
-                title = "Notebook Test",
-                description = "Ini adalah test database",
-                createdAt = System.currentTimeMillis(),
-                updatedAt = System.currentTimeMillis(),
-                sourceCount = 0
-            )
-
-            val id = dao.insertNotebook(testNotebook)
-            println("✅ Database Test: Notebook berhasil disimpan dengan ID: $id")
-        }
-    }
-}

app/src/main/java/com/example/notebook/data/NotebookDao.kt

@@ -10,8 +10,7 @@ import kotlinx.coroutines.flow.Flow
 @Dao
 interface NotebookDao {
 
-    // === NOTEBOOK OPERATIONS ===
-
+    //  NOTEBOOK OPERATIONS
     @Insert
     suspend fun insertNotebook(notebook: NotebookEntity): Long
 
@@ -27,7 +26,7 @@ interface NotebookDao {
     @Query("SELECT * FROM notebooks WHERE id = :notebookId")
     fun getNotebookById(notebookId: Int): Flow<NotebookEntity?>
 
-    // === SOURCE OPERATIONS ===
+    //  SOURCE OPERATIONS
 
     @Insert
     suspend fun insertSource(source: SourceEntity)
@@ -38,7 +37,7 @@ interface NotebookDao {
     @Delete
     suspend fun deleteSource(source: SourceEntity)
 
-    // === CHAT OPERATIONS ===
+    //  CHAT OPERATIONS
 
     @Insert
     suspend fun insertChatMessage(message: ChatMessageEntity)

app/src/main/java/com/example/notebook/data/NotebookEntity.kt

@@ -10,17 +10,14 @@ import androidx.room.PrimaryKey
 data class NotebookEntity(
     @PrimaryKey(autoGenerate = true)
     val id: Int = 0,
-
     val title: String,           // Judul notebook
     val description: String,     // Deskripsi singkat
     val createdAt: Long,         // Timestamp pembuatan
     val updatedAt: Long,         // Timestamp update terakhir
-    val sourceCount: Int = 0     // Jumlah sumber yang diupload
+    val sourceCount: Int = 0,    // Jumlah sumber yang diupload
 )
 
-/**
- * Entity untuk menyimpan sumber/dokumen yang diupload
- */
+// Entity untuk menyimpan sumber/dokumen yang diupload
 @Entity(tableName = "sources")
 data class SourceEntity(
     @PrimaryKey(autoGenerate = true)
@@ -33,9 +30,8 @@ data class SourceEntity(
     val uploadedAt: Long         // Timestamp upload
 )
 
-/**
- * Entity untuk menyimpan chat history dengan AI
- */
+
+// Entity untuk menyimpan chat history dengan AI
 @Entity(tableName = "chat_messages")
 data class ChatMessageEntity(
     @PrimaryKey(autoGenerate = true)

app/src/main/java/com/example/notebook/data/NotebookRepository.kt

@@ -0,0 +1,118 @@
+package com.example.notebook.data
+
+import kotlinx.coroutines.flow.Flow
+
+/**
+ * Repository adalah "perantara" antara ViewModel dan Database
+ * Semua akses database harus lewat sini
+ */
+class NotebookRepository(private val dao: NotebookDao) {
+
+    //  NOTEBOOK OPERATIONS
+
+    // Ambil semua notebooks (otomatis update kalau ada perubahan)
+    fun getAllNotebooks(): Flow<List<NotebookEntity>> {
+        return dao.getAllNotebooks()
+    }
+
+    // Ambil notebook berdasarkan ID
+    fun getNotebookById(id: Int): Flow<NotebookEntity?> {
+        return dao.getNotebookById(id)
+    }
+
+    /**
+     * Buat notebook baru
+     * Return: ID notebook yang baru dibuat
+     */
+    suspend fun createNotebook(
+        title: String,
+        description: String = ""
+    ): Long {
+        val notebook = NotebookEntity(
+            title = title,
+            description = description,
+            createdAt = System.currentTimeMillis(),
+            updatedAt = System.currentTimeMillis(),
+            sourceCount = 0
+        )
+        return dao.insertNotebook(notebook)
+    }
+
+    // Update notebook yang sudah ada
+    suspend fun updateNotebook(notebook: NotebookEntity) {
+        val updated = notebook.copy(updatedAt = System.currentTimeMillis())
+        dao.updateNotebook(updated)
+    }
+
+    // Hapus notebook
+    suspend fun deleteNotebook(notebook: NotebookEntity) {
+        dao.deleteNotebook(notebook)
+    }
+
+    //  SOURCE OPERATIONS
+
+    // Tambah source ke notebook
+    suspend fun addSource(
+        notebookId: Int,
+        fileName: String,
+        fileType: String,
+        filePath: String
+    ) {
+        val source = SourceEntity(
+            notebookId = notebookId,
+            fileName = fileName,
+            fileType = fileType,
+            filePath = filePath,
+            uploadedAt = System.currentTimeMillis()
+        )
+        dao.insertSource(source)
+
+        // Update sourceCount di notebook
+        val notebook = dao.getNotebookById(notebookId)
+        // Note: Ini simplified, di production pakai query COUNT
+    }
+
+    // Ambil semua sources dalam notebook
+    fun getSourcesByNotebook(notebookId: Int): Flow<List<SourceEntity>> {
+        return dao.getSourcesByNotebook(notebookId)
+    }
+
+    // Hapus source
+    suspend fun deleteSource(source: SourceEntity) {
+        dao.deleteSource(source)
+    }
+
+    //  CHAT OPERATIONS
+
+    // Kirim pesan chat (user atau AI)
+    suspend fun sendMessage(
+        notebookId: Int,
+        message: String,
+        isUserMessage: Boolean
+    ) {
+        val chatMessage = ChatMessageEntity(
+            notebookId = notebookId,
+            message = message,
+            isUserMessage = isUserMessage,
+            timestamp = System.currentTimeMillis()
+        )
+        dao.insertChatMessage(chatMessage)
+    }
+
+    // Ambil history chat
+    fun getChatHistory(notebookId: Int): Flow<List<ChatMessageEntity>> {
+        return dao.getChatHistory(notebookId)
+    }
+
+    // Hapus semua chat dalam notebook
+    suspend fun clearChatHistory(notebookId: Int) {
+        dao.clearChatHistory(notebookId)
+    }
+
+    // Hapus pesan AI terakhir (untuk replace dengan hasil sebenarnya)
+    suspend fun clearLastAIMessage(notebookId: Int) {
+        // Get last AI message kaya di GPT bisa di Edit prompt nya
+        // Note: Ini simplified, di production sebaiknya pakai query langsung
+        // Untuk sekarang kita skip dulu, cukup pakai pesan "thinking" yang nanti di-override
+    }
+}

app/src/main/java/com/example/notebook/ui/components/MarkdownText.kt

@@ -0,0 +1,325 @@
+package com.example.notebook.ui.components
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.border
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.text.SpanStyle
+import androidx.compose.ui.text.buildAnnotatedString
+import androidx.compose.ui.text.font.FontStyle
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.text.withStyle
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+
+/**
+ * Composable untuk render markdown text (Parser)
+ * Support: **bold**, *italic*, `code`, # heading, numbered list, bullet list, TABLES
+ */
+@Composable
+fun MarkdownText(
+    markdown: String,
+    modifier: Modifier = Modifier,
+    color: Color = Color.Black
+) {
+    Column(modifier = modifier) {
+        parseMarkdown(markdown).forEach { element ->
+            when (element) {
+                is MarkdownElement.Paragraph -> {
+                    Text(
+                        text = buildStyledText(element.text),
+                        color = color,
+                        lineHeight = 20.sp
+                    )
+                    Spacer(modifier = Modifier.height(8.dp))
+                }
+                is MarkdownElement.Heading -> {
+                    Text(
+                        text = element.text,
+                        fontSize = when (element.level) {
+                            1 -> 24.sp
+                            2 -> 20.sp
+                            3 -> 18.sp
+                            else -> 16.sp
+                        },
+                        fontWeight = FontWeight.Bold,
+                        color = color
+                    )
+                    Spacer(modifier = Modifier.height(12.dp))
+                }
+                is MarkdownElement.ListItem -> {
+                    Row(modifier = Modifier.padding(start = 16.dp)) {
+                        Text(
+                            text = if (element.isNumbered) "${element.number}. " else "• ",
+                            color = color,
+                            fontWeight = FontWeight.Bold
+                        )
+                        Text(
+                            text = buildStyledText(element.text),
+                            color = color,
+                            modifier = Modifier.weight(1f)
+                        )
+                    }
+                    Spacer(modifier = Modifier.height(4.dp))
+                }
+                is MarkdownElement.CodeBlock -> {
+                    Box(
+                        modifier = Modifier
+                            .fillMaxWidth()
+                            .background(
+                                color = Color(0xFFF5F5F5),
+                                shape = RoundedCornerShape(8.dp)
+                            )
+                            .padding(12.dp)
+                    ) {
+                        Text(
+                            text = element.code,
+                            fontFamily = androidx.compose.ui.text.font.FontFamily.Monospace,
+                            fontSize = 13.sp,
+                            color = Color(0xFF37474F)
+                        )
+                    }
+                    Spacer(modifier = Modifier.height(8.dp))
+                }
+                is MarkdownElement.Table -> {
+                    MarkdownTable(
+                        headers = element.headers,
+                        rows = element.rows,
+                        textColor = color
+                    )
+                    Spacer(modifier = Modifier.height(12.dp))
+                }
+            }
+        }
+    }
+}
+
+// Render tabel dengan styling yang bagus
+@Composable
+fun MarkdownTable(
+    headers: List<String>,
+    rows: List<List<String>>,
+    textColor: Color
+) {
+    Column(
+        modifier = Modifier
+            .fillMaxWidth()
+            .border(1.dp, Color(0xFFE0E0E0), RoundedCornerShape(8.dp))
+            .background(Color(0xFFFAFAFA), RoundedCornerShape(8.dp))
+    ) {
+        // Header Row
+        Row(
+            modifier = Modifier
+                .fillMaxWidth()
+                .background(Color(0xFFF0F0F0))
+                .padding(8.dp)
+        ) {
+            headers.forEach { header ->
+                Text(
+                    text = header.trim(),
+                    modifier = Modifier
+                        .weight(1f)
+                        .padding(horizontal = 8.dp),
+                    fontWeight = FontWeight.Bold,
+                    fontSize = 14.sp,
+                    color = textColor,
+                    textAlign = TextAlign.Center
+                )
+            }
+        }
+
+        // Data Rows
+        rows.forEachIndexed { index, row ->
+            Row(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .background(
+                        if (index % 2 == 0) Color.White else Color(0xFFF9F9F9)
+                    )
+                    .padding(8.dp)
+            ) {
+                row.forEach { cell ->
+                    Text(
+                        text = cell.trim(),
+                        modifier = Modifier
+                            .weight(1f)
+                            .padding(horizontal = 8.dp),
+                        fontSize = 13.sp,
+                        color = textColor,
+                        textAlign = TextAlign.Center
+                    )
+                }
+            }
+        }
+    }
+}
+
+// Build styled text dengan support inline markdown
+@Composable
+private fun buildStyledText(text: String) = buildAnnotatedString {
+    var currentIndex = 0
+    val processed = mutableSetOf<IntRange>()
+
+    // Regex patterns
+    val boldPattern = """\*\*(.+?)\*\*""".toRegex()
+    val italicPattern = """\*(.+?)\*""".toRegex()
+    val codePattern = """`(.+?)`""".toRegex()
+
+    // Process bold **text**
+    boldPattern.findAll(text).forEach { match ->
+        if (processed.none { it.contains(match.range.first) }) {
+            append(text.substring(currentIndex, match.range.first))
+            withStyle(SpanStyle(fontWeight = FontWeight.Bold)) {
+                append(match.groupValues[1])
+            }
+            currentIndex = match.range.last + 1
+            processed.add(match.range)
+        }
+    }
+
+    // Process italic *text*
+    italicPattern.findAll(text).forEach { match ->
+        if (processed.none { it.contains(match.range.first) }) {
+            append(text.substring(currentIndex, match.range.first))
+            withStyle(SpanStyle(fontStyle = FontStyle.Italic)) {
+                append(match.groupValues[1])
+            }
+            currentIndex = match.range.last + 1
+            processed.add(match.range)
+        }
+    }
+
+    // Process inline code `text`
+    codePattern.findAll(text).forEach { match ->
+        if (processed.none { it.contains(match.range.first) }) {
+            append(text.substring(currentIndex, match.range.first))
+            withStyle(
+                SpanStyle(
+                    fontFamily = androidx.compose.ui.text.font.FontFamily.Monospace,
+                    background = Color(0xFFF5F5F5),
+                    color = Color(0xFFE91E63)
+                )
+            ) {
+                append(" ${match.groupValues[1]} ")
+            }
+            currentIndex = match.range.last + 1
+            processed.add(match.range)
+        }
+    }
+
+    // Append remaining text
+    if (currentIndex < text.length) {
+        append(text.substring(currentIndex))
+    }
+}
+
+// Parse markdown string menjadi list of elements
+private fun parseMarkdown(markdown: String): List<MarkdownElement> {
+    val lines = markdown.lines()
+    val elements = mutableListOf<MarkdownElement>()
+    var i = 0
+
+    while (i < lines.size) {
+        val line = lines[i].trim()
+
+        when {
+            // Tabel (detect by separator line with |---|---|)
+            line.contains("|") && i + 1 < lines.size && lines[i + 1].trim().matches(Regex("^\\|?\\s*[-:]+\\s*\\|.*$")) -> {
+                val tableLines = mutableListOf<String>()
+
+                // Collect all table lines
+                var tableIndex = i
+                while (tableIndex < lines.size && lines[tableIndex].contains("|")) {
+                    tableLines.add(lines[tableIndex])
+                    tableIndex++
+                }
+
+                if (tableLines.size >= 2) {
+                    // Parse header
+                    val headerCells = tableLines[0]
+                        .split("|")
+                        .map { it.trim() }
+                        .filter { it.isNotEmpty() }
+
+                    // Parse rows (skip separator line)
+                    val dataRows = tableLines.drop(2).map { rowLine ->
+                        rowLine.split("|")
+                            .map { it.trim() }
+                            .filter { it.isNotEmpty() }
+                    }.filter { it.isNotEmpty() }
+
+                    elements.add(MarkdownElement.Table(headerCells, dataRows))
+                    i = tableIndex
+                    continue
+                }
+            }
+
+            // Heading
+            line.startsWith("#") -> {
+                val level = line.takeWhile { it == '#' }.length
+                val text = line.dropWhile { it == '#' }.trim()
+                elements.add(MarkdownElement.Heading(level, text))
+            }
+
+            // Numbered list
+            line.matches("""^\d+\.\s+.+""".toRegex()) -> {
+                val parts = line.split(".", limit = 2)
+                val number = parts[0].toIntOrNull() ?: 1
+                val text = parts.getOrNull(1)?.trim() ?: ""
+                elements.add(MarkdownElement.ListItem(text, true, number))
+            }
+
+            // Bullet list
+            line.startsWith("•") || line.startsWith("-") || line.startsWith("*") -> {
+                val text = line.drop(1).trim()
+                elements.add(MarkdownElement.ListItem(text, false))
+            }
+
+            // Code block (multi-line)
+            line.startsWith("```") -> {
+                i++
+                val codeLines = mutableListOf<String>()
+                while (i < lines.size && !lines[i].trim().startsWith("```")) {
+                    codeLines.add(lines[i])
+                    i++
+                }
+                elements.add(MarkdownElement.CodeBlock(codeLines.joinToString("\n")))
+            }
+
+            // Empty line
+            line.isEmpty() -> {
+                // Skip empty lines
+            }
+
+            // Regular paragraph
+            else -> {
+                elements.add(MarkdownElement.Paragraph(line))
+            }
+        }
+        i++
+    }
+
+    return elements
+}
+
+// Markdown Elements
+private sealed class MarkdownElement {
+    data class Paragraph(val text: String) : MarkdownElement()
+    data class Heading(val level: Int, val text: String) : MarkdownElement()
+    data class ListItem(
+        val text: String,
+        val isNumbered: Boolean = false,
+        val number: Int = 0
+    ) : MarkdownElement()
+    data class CodeBlock(val code: String) : MarkdownElement()
+    data class Table(
+        val headers: List<String>,
+        val rows: List<List<String>>
+    ) : MarkdownElement()
+}

app/src/main/java/com/example/notebook/ui/screen/NotebookDetailScreen.kt

@@ -0,0 +1,882 @@
+package com.example.notebook.ui.screens
+
+import android.content.Context
+import android.content.Intent
+import android.net.Uri
+import androidx.activity.compose.rememberLauncherForActivityResult
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.compose.animation.core.*
+import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.lazy.rememberLazyListState
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.ArrowBack
+import androidx.compose.material.icons.automirrored.filled.Send
+import androidx.compose.material.icons.filled.*
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import androidx.core.content.FileProvider
+import com.example.notebook.data.ChatMessageEntity
+import com.example.notebook.data.SourceEntity
+import com.example.notebook.ui.components.MarkdownText
+import com.example.notebook.viewmodel.NotebookViewModel
+import kotlinx.coroutines.launch
+import java.io.File
+import java.text.SimpleDateFormat
+import java.util.*
+
+// Color theme untuk konsistensi dengan menu utama
+private val PrimaryPurple = Color(0xFF7C3AED)
+private val LightPurple = Color(0xFFF3F0FF)
+private val BackgroundWhite = Color(0xFFFAFAFA)
+private val CardBackground = Color.White
+private val TextPrimary = Color(0xFF1F2937)
+private val TextSecondary = Color(0xFF6B7280)
+
+/**
+ * Fungsi untuk buka file dengan aplikasi default
+ */
+fun openFile(context: Context, source: SourceEntity) {
+    try {
+        val file = File(source.filePath)
+
+        if (!file.exists()) {
+            android.widget.Toast.makeText(context, "File tidak ditemukan", android.widget.Toast.LENGTH_SHORT).show()
+            return
+        }
+
+        val mimeType = when (source.fileType) {
+            "PDF" -> "application/pdf"
+            "Image" -> "image/*" // Belum Support
+            "Text" -> "text/plain"
+            "Markdown" -> "text/markdown"
+            "Word" -> "application/vnd.openxmlformats-officedocument.wordprocessingml.document" // Belum Support
+            "PowerPoint" -> "application/vnd.openxmlformats-officedocument.presentationml.presentation" // Belum Support
+            "Audio" -> "audio/*" // Belum Support
+            "Video" -> "video/*" // Belum Support
+            else -> "*/*"
+        }
+
+        val uri = FileProvider.getUriForFile(
+            context,
+            "${context.packageName}.fileprovider",
+            file
+        )
+
+        val intent = Intent(Intent.ACTION_VIEW).apply {
+            setDataAndType(uri, mimeType)
+            addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+            addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+        }
+
+        if (intent.resolveActivity(context.packageManager) != null) {
+            context.startActivity(intent)
+        } else {
+            val chooser = Intent.createChooser(intent, "Buka dengan")
+            context.startActivity(chooser)
+        }
+
+    } catch (e: Exception) {
+        android.widget.Toast.makeText(
+            context,
+            "Tidak bisa membuka file: ${e.message}",
+            android.widget.Toast.LENGTH_LONG
+        ).show()
+        e.printStackTrace()
+    }
+}
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun NotebookDetailScreen(
+    viewModel: NotebookViewModel,
+    notebookId: Int,
+    onBack: () -> Unit
+) {
+    val context = LocalContext.current
+    val notebook by viewModel.currentNotebook.collectAsState()
+    val sources by viewModel.sources.collectAsState()
+    val chatMessages by viewModel.chatMessages.collectAsState()
+    val isLoading by viewModel.isLoading.collectAsState()
+    var selectedTab by remember { mutableIntStateOf(0) }
+    val tabs = listOf("Chat", "Sources")
+    var chatInput by remember { mutableStateOf("") }
+    var showUploadMenu by remember { mutableStateOf(false) }
+    var showDeleteDialog by remember { mutableStateOf(false) }
+    var sourceToDelete by remember { mutableStateOf<SourceEntity?>(null) }
+
+    // Loading overlay dengan desain modern
+    if (isLoading) {
+        Box(
+            modifier = Modifier
+                .fillMaxSize()
+                .background(Color.Black.copy(alpha = 0.6f))
+                .clickable(enabled = false) { },
+            contentAlignment = Alignment.Center
+        ) {
+            Card(
+                modifier = Modifier.padding(32.dp),
+                shape = RoundedCornerShape(24.dp),
+                colors = CardDefaults.cardColors(containerColor = CardBackground),
+                elevation = CardDefaults.cardElevation(defaultElevation = 8.dp)
+            ) {
+                Column(
+                    modifier = Modifier.padding(32.dp),
+                    horizontalAlignment = Alignment.CenterHorizontally
+                ) {
+                    CircularProgressIndicator(color = PrimaryPurple)
+                    Spacer(modifier = Modifier.height(20.dp))
+                    Text(
+                        "Processing...",
+                        style = MaterialTheme.typography.titleMedium,
+                        fontWeight = FontWeight.SemiBold,
+                        color = TextPrimary
+                    )
+                    Spacer(modifier = Modifier.height(8.dp))
+                    Text(
+                        "AI sedang membaca dokumen",
+                        style = MaterialTheme.typography.bodyMedium,
+                        color = TextSecondary
+                    )
+                }
+            }
+        }
+    }
+
+    // Delete confirmation dialog
+    if (showDeleteDialog && sourceToDelete != null) {
+        AlertDialog(
+            onDismissRequest = { showDeleteDialog = false },
+            title = {
+                Text(
+                    "Hapus File?",
+                    fontWeight = FontWeight.Bold,
+                    color = TextPrimary
+                )
+            },
+            text = {
+                Text(
+                    "File \"${sourceToDelete?.fileName}\" akan dihapus permanen. Lanjutkan?",
+                    color = TextSecondary
+                )
+            },
+            confirmButton = {
+                Button(
+                    onClick = {
+                        sourceToDelete?.let { viewModel.deleteSource(it) }
+                        showDeleteDialog = false
+                        sourceToDelete = null
+                    },
+                    colors = ButtonDefaults.buttonColors(containerColor = Color(0xFFEF4444)),
+                    shape = RoundedCornerShape(12.dp)
+                ) {
+                    Text("Hapus", fontWeight = FontWeight.SemiBold)
+                }
+            },
+            dismissButton = {
+                TextButton(
+                    onClick = {
+                        showDeleteDialog = false
+                        sourceToDelete = null
+                    }
+                ) {
+                    Text("Batal", color = TextSecondary, fontWeight = FontWeight.Medium)
+                }
+            },
+            shape = RoundedCornerShape(20.dp)
+        )
+    }
+
+    val filePickerLauncher = rememberLauncherForActivityResult(
+        contract = ActivityResultContracts.GetContent()
+    ) { uri: Uri? ->
+        uri?.let {
+            viewModel.uploadFile(context, it, notebookId)
+        }
+    }
+
+    LaunchedEffect(notebookId) {
+        println("🚀 NotebookDetailScreen: LaunchedEffect triggered untuk ID: $notebookId")
+        viewModel.selectNotebook(notebookId)
+    }
+
+    LaunchedEffect(notebook) {
+        println("📝 Notebook state updated: ${notebook?.title ?: "NULL"}")
+    }
+
+    LaunchedEffect(sources) {
+        println("📚 Sources updated: ${sources.size} items")
+    }
+
+    Scaffold(
+        containerColor = BackgroundWhite,
+        topBar = {
+            TopAppBar(
+                title = {
+                    Column {
+                        Text(
+                            text = notebook?.title ?: "Loading...",
+                            fontSize = 20.sp,
+                            fontWeight = FontWeight.Bold,
+                            color = TextPrimary
+                        )
+                        if (notebook != null) {
+                            Text(
+                                text = "${sources.size} sources tersimpan",
+                                fontSize = 13.sp,
+                                color = TextSecondary,
+                                fontWeight = FontWeight.Medium
+                            )
+                        }
+                    }
+                },
+                navigationIcon = {
+                    IconButton(onClick = onBack) {
+                        Icon(
+                            Icons.AutoMirrored.Filled.ArrowBack,
+                            contentDescription = "Back",
+                            tint = TextPrimary
+                        )
+                    }
+                },
+                actions = {
+                    Box {
+                        IconButton(onClick = { showUploadMenu = true }) {
+                            Icon(
+                                Icons.Default.Add,
+                                contentDescription = "Upload",
+                                tint = PrimaryPurple,
+                                modifier = Modifier.size(28.dp)
+                            )
+                        }
+                        DropdownMenu(
+                            expanded = showUploadMenu,
+                            onDismissRequest = { showUploadMenu = false },
+                            modifier = Modifier.background(CardBackground, RoundedCornerShape(16.dp))
+                        ) {
+                            DropdownMenuItem(
+                                text = {
+                                    Text(
+                                        "Upload File",
+                                        fontWeight = FontWeight.Medium,
+                                        color = TextPrimary
+                                    )
+                                },
+                                onClick = {
+                                    filePickerLauncher.launch("*/*")
+                                    showUploadMenu = false
+                                },
+                                leadingIcon = {
+                                    Icon(Icons.Default.CloudUpload, null, tint = PrimaryPurple)
+                                }
+                            )
+                            if (sources.isNotEmpty()) {
+                                Divider(modifier = Modifier.padding(vertical = 4.dp))
+                                DropdownMenuItem(
+                                    text = {
+                                        Text(
+                                            "Generate Summary",
+                                            fontWeight = FontWeight.Medium,
+                                            color = TextPrimary
+                                        )
+                                    },
+                                    onClick = {
+                                        viewModel.generateSummary(notebookId)
+                                        selectedTab = 0
+                                        showUploadMenu = false
+                                    },
+                                    leadingIcon = {
+                                        Icon(Icons.Default.Summarize, null, tint = PrimaryPurple)
+                                    }
+                                )
+                            }
+                        }
+                    }
+                },
+                colors = TopAppBarDefaults.topAppBarColors(
+                    containerColor = CardBackground
+                )
+            )
+        },
+        bottomBar = {
+            if (selectedTab == 0) {
+                Surface(
+                    color = CardBackground,
+                    shadowElevation = 8.dp
+                ) {
+                    Row(
+                        modifier = Modifier
+                            .fillMaxWidth()
+                            .padding(horizontal = 16.dp, vertical = 12.dp),
+                        verticalAlignment = Alignment.CenterVertically
+                    ) {
+                        OutlinedTextField(
+                            value = chatInput,
+                            onValueChange = { chatInput = it },
+                            placeholder = {
+                                Text(
+                                    "Tanyakan apapun tentang dokumen Anda...",
+                                    color = TextSecondary
+                                )
+                            },
+                            modifier = Modifier.weight(1f),
+                            shape = RoundedCornerShape(16.dp),
+                            colors = OutlinedTextFieldDefaults.colors(
+                                focusedBorderColor = PrimaryPurple,
+                                unfocusedBorderColor = Color(0xFFE5E7EB)
+                            )
+                        )
+                        Spacer(modifier = Modifier.width(8.dp))
+                        IconButton(
+                            onClick = {
+                                if (chatInput.isNotBlank()) {
+                                    viewModel.sendUserMessage(notebookId, chatInput)
+                                    chatInput = ""
+                                }
+                            },
+                            modifier = Modifier
+                                .size(48.dp)
+                                .background(
+                                    if (chatInput.isNotBlank()) PrimaryPurple else Color(0xFFE5E7EB),
+                                    CircleShape
+                                )
+                        ) {
+                            Icon(
+                                Icons.AutoMirrored.Filled.Send,
+                                contentDescription = "Send",
+                                tint = if (chatInput.isNotBlank()) Color.White else TextSecondary
+                            )
+                        }
+                    }
+                }
+            }
+        }
+    ) { padding ->
+        Column(modifier = Modifier.padding(padding)) {
+            // Custom Tab dengan desain modern
+            Surface(
+                color = CardBackground,
+                shadowElevation = 2.dp
+            ) {
+                Row(
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .padding(horizontal = 16.dp, vertical = 8.dp),
+                    horizontalArrangement = Arrangement.spacedBy(8.dp)
+                ) {
+                    tabs.forEachIndexed { index, title ->
+                        Surface(
+                            modifier = Modifier
+                                .weight(1f)
+                                .clickable { selectedTab = index },
+                            shape = RoundedCornerShape(12.dp),
+                            color = if (selectedTab == index) PrimaryPurple else Color.Transparent
+                        ) {
+                            Box(
+                                modifier = Modifier.padding(vertical = 12.dp),
+                                contentAlignment = Alignment.Center
+                            ) {
+                                Text(
+                                    text = title,
+                                    fontWeight = if (selectedTab == index) FontWeight.Bold else FontWeight.Medium,
+                                    color = if (selectedTab == index) Color.White else TextSecondary,
+                                    fontSize = 15.sp
+                                )
+                            }
+                        }
+                    }
+                }
+            }
+
+            when (selectedTab) {
+                0 -> ChatTab(
+                    messages = chatMessages,
+                    sources = sources,
+                    onUploadClick = { filePickerLauncher.launch("*/*") },
+                    isLoading = isLoading
+                )
+                1 -> SourcesTab(
+                    sources = sources,
+                    onUploadClick = { filePickerLauncher.launch("*/*") },
+                    onDeleteSource = { source ->
+                        sourceToDelete = source
+                        showDeleteDialog = true
+                    },
+                    onOpenSource = { source ->
+                        openFile(context, source)
+                    }
+                )
+            }
+        }
+    }
+}
+
+@Composable
+fun ChatTab(
+    messages: List<ChatMessageEntity>,
+    sources: List<SourceEntity>,
+    onUploadClick: () -> Unit,
+    isLoading: Boolean = false
+) {
+    val listState = rememberLazyListState()
+    val coroutineScope = rememberCoroutineScope()
+
+    // Auto scroll ke chat terbaru
+    LaunchedEffect(messages.size) {
+        if (messages.isNotEmpty()) {
+            coroutineScope.launch {
+                listState.animateScrollToItem(messages.size)
+            }
+        }
+    }
+
+    if (messages.isEmpty() && !isLoading) {
+        // Empty state dengan desain modern
+        Column(
+            modifier = Modifier
+                .fillMaxSize()
+                .background(BackgroundWhite)
+                .padding(32.dp),
+            horizontalAlignment = Alignment.CenterHorizontally,
+            verticalArrangement = Arrangement.Center
+        ) {
+            Box(
+                modifier = Modifier
+                    .size(80.dp)
+                    .background(LightPurple, CircleShape),
+                contentAlignment = Alignment.Center
+            ) {
+                Icon(
+                    Icons.Default.Chat,
+                    contentDescription = null,
+                    modifier = Modifier.size(40.dp),
+                    tint = PrimaryPurple
+                )
+            }
+            Spacer(modifier = Modifier.height(24.dp))
+            Text(
+                text = if (sources.isEmpty()) "Upload dokumen untuk mulai chat"
+                else "Tanyakan apapun tentang dokumen Anda!",
+                style = MaterialTheme.typography.titleLarge,
+                fontWeight = FontWeight.Bold,
+                textAlign = TextAlign.Center,
+                color = TextPrimary
+            )
+            Spacer(modifier = Modifier.height(8.dp))
+            Text(
+                text = if (sources.isEmpty())
+                    "AI akan membantu Anda memahami dokumen dengan lebih baik"
+                else "AI siap menjawab pertanyaan Anda",
+                style = MaterialTheme.typography.bodyMedium,
+                textAlign = TextAlign.Center,
+                color = TextSecondary
+            )
+            if (sources.isEmpty()) {
+                Spacer(modifier = Modifier.height(24.dp))
+                Button(
+                    onClick = onUploadClick,
+                    colors = ButtonDefaults.buttonColors(containerColor = PrimaryPurple),
+                    shape = RoundedCornerShape(16.dp),
+                    contentPadding = PaddingValues(horizontal = 24.dp, vertical = 14.dp)
+                ) {
+                    Icon(Icons.Default.CloudUpload, contentDescription = null)
+                    Spacer(modifier = Modifier.width(8.dp))
+                    Text("Upload Dokumen", fontWeight = FontWeight.SemiBold)
+                }
+            }
+        }
+    } else {
+        LazyColumn(
+            state = listState,
+            modifier = Modifier
+                .fillMaxSize()
+                .background(BackgroundWhite),
+            contentPadding = PaddingValues(16.dp),
+            verticalArrangement = Arrangement.spacedBy(16.dp)
+        ) {
+            items(messages) { message ->
+                ChatBubble(message = message)
+            }
+
+            // Typing indicator saat AI sedang memproses
+            if (isLoading) {
+                item {
+                    TypingIndicator()
+                }
+            }
+        }
+    }
+}
+
+@Composable
+fun TypingIndicator() {
+    Row(
+        modifier = Modifier.fillMaxWidth(),
+        horizontalArrangement = Arrangement.Start
+    ) {
+        // AI Avatar
+        Box(
+            modifier = Modifier
+                .size(36.dp)
+                .clip(CircleShape)
+                .background(LightPurple),
+            contentAlignment = Alignment.Center
+        ) {
+            Icon(
+                Icons.Default.AutoAwesome,
+                contentDescription = null,
+                tint = PrimaryPurple,
+                modifier = Modifier.size(20.dp)
+            )
+        }
+        Spacer(modifier = Modifier.width(8.dp))
+
+        // Typing animation card
+        Surface(
+            color = CardBackground,
+            shape = RoundedCornerShape(
+                topStart = 20.dp,
+                topEnd = 20.dp,
+                bottomStart = 4.dp,
+                bottomEnd = 20.dp
+            ),
+            shadowElevation = 1.dp
+        ) {
+            Row(
+                modifier = Modifier.padding(horizontal = 20.dp, vertical = 16.dp),
+                horizontalArrangement = Arrangement.spacedBy(6.dp),
+                verticalAlignment = Alignment.CenterVertically
+            ) {
+                // Animated dots
+                repeat(3) { index ->
+                    val infiniteTransition = rememberInfiniteTransition(label = "dot$index")
+                    val scale by infiniteTransition.animateFloat(
+                        initialValue = 0.5f,
+                        targetValue = 1f,
+                        animationSpec = infiniteRepeatable(
+                            animation = tween(600, delayMillis = index * 150),
+                            repeatMode = RepeatMode.Reverse
+                        ),
+                        label = "scale$index"
+                    )
+
+                    Box(
+                        modifier = Modifier
+                            .size(8.dp * scale)
+                            .clip(CircleShape)
+                            .background(TextSecondary.copy(alpha = 0.6f))
+                    )
+                }
+            }
+        }
+    }
+}
+
+@Composable
+fun ChatBubble(message: ChatMessageEntity) {
+    val dateFormat = SimpleDateFormat("HH:mm", Locale.getDefault())
+    val context = LocalContext.current
+
+    Row(
+        modifier = Modifier.fillMaxWidth(),
+        horizontalArrangement = if (message.isUserMessage) Arrangement.End else Arrangement.Start
+    ) {
+        if (!message.isUserMessage) {
+            // AI Avatar dengan desain modern
+            Box(
+                modifier = Modifier
+                    .size(36.dp)
+                    .clip(CircleShape)
+                    .background(LightPurple),
+                contentAlignment = Alignment.Center
+            ) {
+                Icon(
+                    Icons.Default.AutoAwesome,
+                    contentDescription = null,
+                    tint = PrimaryPurple,
+                    modifier = Modifier.size(20.dp)
+                )
+            }
+            Spacer(modifier = Modifier.width(8.dp))
+        }
+
+        Column(
+            modifier = Modifier.widthIn(max = 280.dp),
+            horizontalAlignment = if (message.isUserMessage) Alignment.End else Alignment.Start
+        ) {
+            Surface(
+                color = if (message.isUserMessage) PrimaryPurple else CardBackground,
+                shape = RoundedCornerShape(
+                    topStart = 20.dp,
+                    topEnd = 20.dp,
+                    bottomStart = if (message.isUserMessage) 20.dp else 4.dp,
+                    bottomEnd = if (message.isUserMessage) 4.dp else 20.dp
+                ),
+                shadowElevation = if (!message.isUserMessage) 1.dp else 0.dp,
+                modifier = if (!message.isUserMessage) {
+                    Modifier.clickable {
+                        // Copy text ke clipboard
+                        val clipboard = context.getSystemService(Context.CLIPBOARD_SERVICE) as android.content.ClipboardManager
+                        val clip = android.content.ClipData.newPlainText("AI Response", message.message)
+                        clipboard.setPrimaryClip(clip)
+
+                        // Show toast feedback
+                        android.widget.Toast.makeText(
+                            context,
+                            "✅ Teks disalin!",
+                            android.widget.Toast.LENGTH_SHORT
+                        ).show()
+                    }
+                } else Modifier
+            ) {
+                if (message.isUserMessage) {
+                    Text(
+                        text = message.message,
+                        modifier = Modifier.padding(horizontal = 16.dp, vertical = 12.dp),
+                        color = Color.White,
+                        fontSize = 15.sp
+                    )
+                } else {
+                    MarkdownText(
+                        markdown = message.message,
+                        modifier = Modifier.padding(horizontal = 16.dp, vertical = 12.dp),
+                        color = TextPrimary
+                    )
+                }
+            }
+
+            Row(
+                verticalAlignment = Alignment.CenterVertically,
+                modifier = Modifier.padding(horizontal = 8.dp, vertical = 4.dp)
+            ) {
+                Text(
+                    text = dateFormat.format(Date(message.timestamp)),
+                    fontSize = 11.sp,
+                    color = TextSecondary
+                )
+
+                // Copy indicator untuk AI message
+                if (!message.isUserMessage) {
+                    Spacer(modifier = Modifier.width(8.dp))
+                    Icon(
+                        Icons.Default.ContentCopy,
+                        contentDescription = "Tap to copy",
+                        tint = TextSecondary.copy(alpha = 0.6f),
+                        modifier = Modifier.size(12.dp)
+                    )
+                }
+            }
+        }
+
+        if (message.isUserMessage) {
+            Spacer(modifier = Modifier.width(8.dp))
+            // User Avatar dengan desain modern
+            Box(
+                modifier = Modifier
+                    .size(36.dp)
+                    .clip(CircleShape)
+                    .background(PrimaryPurple),
+                contentAlignment = Alignment.Center
+            ) {
+                Icon(
+                    Icons.Default.Person,
+                    contentDescription = null,
+                    tint = Color.White,
+                    modifier = Modifier.size(20.dp)
+                )
+            }
+        }
+    }
+}
+
+@Composable
+fun SourcesTab(
+    sources: List<SourceEntity>,
+    onUploadClick: () -> Unit,
+    onDeleteSource: (SourceEntity) -> Unit,
+    onOpenSource: (SourceEntity) -> Unit
+) {
+    if (sources.isEmpty()) {
+        Column(
+            modifier = Modifier
+                .fillMaxSize()
+                .background(BackgroundWhite)
+                .padding(32.dp),
+            horizontalAlignment = Alignment.CenterHorizontally,
+            verticalArrangement = Arrangement.Center
+        ) {
+            Box(
+                modifier = Modifier
+                    .size(80.dp)
+                    .background(LightPurple, CircleShape),
+                contentAlignment = Alignment.Center
+            ) {
+                Icon(
+                    Icons.Default.Description,
+                    contentDescription = null,
+                    modifier = Modifier.size(40.dp),
+                    tint = PrimaryPurple
+                )
+            }
+            Spacer(modifier = Modifier.height(24.dp))
+            Text(
+                text = "Belum ada dokumen",
+                style = MaterialTheme.typography.titleLarge,
+                fontWeight = FontWeight.Bold,
+                textAlign = TextAlign.Center,
+                color = TextPrimary
+            )
+            Spacer(modifier = Modifier.height(8.dp))
+            Text(
+                text = "Upload dokumen untuk memulai",
+                style = MaterialTheme.typography.bodyMedium,
+                color = TextSecondary,
+                textAlign = TextAlign.Center
+            )
+            Spacer(modifier = Modifier.height(24.dp))
+            Button(
+                onClick = onUploadClick,
+                colors = ButtonDefaults.buttonColors(containerColor = PrimaryPurple),
+                shape = RoundedCornerShape(16.dp),
+                contentPadding = PaddingValues(horizontal = 24.dp, vertical = 14.dp)
+            ) {
+                Icon(Icons.Default.CloudUpload, contentDescription = null)
+                Spacer(modifier = Modifier.width(8.dp))
+                Text("Upload Dokumen", fontWeight = FontWeight.SemiBold)
+            }
+        }
+    } else {
+        LazyColumn(
+            modifier = Modifier
+                .fillMaxSize()
+                .background(BackgroundWhite),
+            contentPadding = PaddingValues(16.dp),
+            verticalArrangement = Arrangement.spacedBy(12.dp)
+        ) {
+            items(sources) { source ->
+                SourceCard(
+                    source = source,
+                    onDelete = { onDeleteSource(source) },
+                    onOpen = { onOpenSource(source) }
+                )
+            }
+        }
+    }
+}
+
+@Composable
+fun SourceCard(
+    source: SourceEntity,
+    onDelete: () -> Unit,
+    onOpen: () -> Unit
+) {
+    val dateFormat = SimpleDateFormat("dd MMM yyyy", Locale.getDefault())
+
+    Card(
+        modifier = Modifier
+            .fillMaxWidth()
+            .clickable { onOpen() },
+        colors = CardDefaults.cardColors(containerColor = CardBackground),
+        shape = RoundedCornerShape(16.dp),
+        elevation = CardDefaults.cardElevation(defaultElevation = 2.dp)
+    ) {
+        Row(
+            modifier = Modifier
+                .fillMaxWidth()
+                .padding(16.dp),
+            verticalAlignment = Alignment.CenterVertically
+        ) {
+            Box(
+                modifier = Modifier
+                    .size(48.dp)
+                    .clip(RoundedCornerShape(12.dp))
+                    .background(
+                        when (source.fileType) {
+                            "PDF" -> Color(0xFFE53935).copy(alpha = 0.15f)
+                            "Image" -> Color(0xFF43A047).copy(alpha = 0.15f)
+                            "Text", "Markdown" -> Color(0xFF1E88E5).copy(alpha = 0.15f)
+                            "Audio" -> Color(0xFFFF6F00).copy(alpha = 0.15f)
+                            "Word" -> Color(0xFF2196F3).copy(alpha = 0.15f)
+                            "PowerPoint" -> Color(0xFFFF6D00).copy(alpha = 0.15f)
+                            else -> Color.Gray.copy(alpha = 0.15f)
+                        }
+                    ),
+                contentAlignment = Alignment.Center
+            ) {
+                Icon(
+                    when (source.fileType) {
+                        "PDF" -> Icons.Default.PictureAsPdf
+                        "Image" -> Icons.Default.Image
+                        "Text", "Markdown" -> Icons.Default.Description
+                        "Audio" -> Icons.Default.AudioFile
+                        "Word" -> Icons.Default.Article
+                        "PowerPoint" -> Icons.Default.Slideshow
+                        else -> Icons.Default.InsertDriveFile
+                    },
+                    contentDescription = null,
+                    modifier = Modifier.size(24.dp),
+                    tint = when (source.fileType) {
+                        "PDF" -> Color(0xFFE53935)
+                        "Image" -> Color(0xFF43A047)
+                        "Text", "Markdown" -> Color(0xFF1E88E5)
+                        "Audio" -> Color(0xFFFF6F00)
+                        "Word" -> Color(0xFF2196F3)
+                        "PowerPoint" -> Color(0xFFFF6D00)
+                        else -> Color.Gray
+                    }
+                )
+            }
+
+            Spacer(modifier = Modifier.width(16.dp))
+
+            Column(modifier = Modifier.weight(1f)) {
+                Text(
+                    text = source.fileName,
+                    style = MaterialTheme.typography.bodyLarge,
+                    fontWeight = FontWeight.SemiBold,
+                    maxLines = 1,
+                    color = TextPrimary
+                )
+                Spacer(modifier = Modifier.height(4.dp))
+                Row(verticalAlignment = Alignment.CenterVertically) {
+                    Text(
+                        text = source.fileType,
+                        style = MaterialTheme.typography.bodySmall,
+                        fontWeight = FontWeight.Medium,
+                        color = TextSecondary
+                    )
+                    Text(
+                        text = " • ${dateFormat.format(Date(source.uploadedAt))}",
+                        style = MaterialTheme.typography.bodySmall,
+                        color = TextSecondary
+                    )
+                }
+            }
+
+            IconButton(
+                onClick = onDelete,
+                modifier = Modifier.size(40.dp)
+            ) {
+                Icon(
+                    Icons.Default.Delete,
+                    contentDescription = "Delete",
+                    tint = Color(0xFF9CA3AF)
+                )
+            }
+        }
+    }
+}

app/src/main/java/com/example/notebook/utils/FileHelper.kt

@@ -0,0 +1,124 @@
+package com.example.notebook.utils
+
+import android.content.Context
+import android.net.Uri
+import android.provider.OpenableColumns
+import java.io.File
+import java.io.FileOutputStream
+
+/**
+ * Helper untuk handle file operations
+ */
+object FileHelper {
+
+    /**
+     * Copy file dari URI ke internal storage
+     * Return: Path file yang disimpan
+     */
+    fun copyFileToInternalStorage(context: Context, uri: Uri, notebookId: Int): String? {
+        try {
+            val fileName = getFileName(context, uri) ?: "file_${System.currentTimeMillis()}"
+
+            // Buat folder untuk notebook ini
+            val notebookDir = File(context.filesDir, "notebooks/$notebookId")
+            if (!notebookDir.exists()) {
+                notebookDir.mkdirs()
+            }
+
+            // Buat file baru
+            val destinationFile = File(notebookDir, fileName)
+
+            // Copy file
+            context.contentResolver.openInputStream(uri)?.use { input ->
+                FileOutputStream(destinationFile).use { output ->
+                    input.copyTo(output)
+                }
+            }
+
+            return destinationFile.absolutePath
+        } catch (e: Exception) {
+            e.printStackTrace()
+            return null
+        }
+    }
+
+    // Ambil nama file
+    fun getFileName(context: Context, uri: Uri): String? {
+        var fileName: String? = null
+
+        context.contentResolver.query(uri, null, null, null, null)?.use { cursor ->
+            if (cursor.moveToFirst()) {
+                val nameIndex = cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME)
+                if (nameIndex >= 0) {
+                    fileName = cursor.getString(nameIndex)
+                }
+            }
+        }
+
+        return fileName
+    }
+
+    // Deteksi tipe file dari extension
+    fun getFileType(fileName: String): String {
+        val type = when (fileName.substringAfterLast('.').lowercase()) {
+            "pdf" -> "PDF"
+            "txt" -> "Text"
+            "md", "markdown" -> "Markdown"
+            "jpg", "jpeg", "png", "gif" -> "Image"
+            "mp3", "wav", "m4a" -> "Audio"
+            "mp4", "avi", "mkv" -> "Video"
+            "doc", "docx" -> "Word"
+            "ppt", "pptx" -> "PowerPoint"
+            else -> "Unknown"
+        }
+        println("🔍 File: $fileName → Type: $type")
+        return type
+    }
+
+    // Baca text dari file (support Text, Markdown, dan PDF)
+    fun readTextFromFile(filePath: String): String? {
+        return try {
+            val file = File(filePath)
+            val extension = file.extension.lowercase()
+
+            when (extension) {
+                "pdf" -> {
+                    // Extract text dari PDF
+                    PdfHelper.extractTextFromPdf(filePath)
+                }
+                "txt", "md", "markdown" -> {
+                    // Baca text biasa
+                    file.readText()
+                }
+                else -> {
+                    println("⚠️ Format file tidak didukung untuk ekstraksi teks: $extension")
+                    null
+                }
+            }
+        } catch (e: Exception) {
+            e.printStackTrace()
+            null
+        }
+    }
+
+    // Format ukuran file
+    fun formatFileSize(size: Long): String {
+        if (size < 1024) return "$size B"
+        val kb = size / 1024.0
+        if (kb < 1024) return "%.2f KB".format(kb)
+        val mb = kb / 1024.0
+        if (mb < 1024) return "%.2f MB".format(mb)
+        val gb = mb / 1024.0
+        return "%.2f GB".format(gb)
+    }
+
+    // Hapus file
+    fun deleteFile(filePath: String): Boolean {
+        return try {
+            File(filePath).delete()
+        } catch (e: Exception) {
+            e.printStackTrace()
+            false
+        }
+    }
+}

app/src/main/java/com/example/notebook/utils/PdfHelper.kt

@@ -0,0 +1,87 @@
+package com.example.notebook.utils
+
+import android.content.Context
+import android.net.Uri
+import com.tom_roush.pdfbox.android.PDFBoxResourceLoader
+import com.tom_roush.pdfbox.pdmodel.PDDocument
+import com.tom_roush.pdfbox.text.PDFTextStripper
+import java.io.File
+
+/**
+ * Helper untuk extract text dari PDF
+ */
+object PdfHelper {
+
+    // Initialize PDFBox (panggil sekali saat app start)
+    fun initialize(context: Context) {
+        PDFBoxResourceLoader.init(context)
+    }
+
+    /**
+     * Extract text dari PDF file
+     * Return: Text content atau null jika error
+     */
+    fun extractTextFromPdf(filePath: String): String? {
+        return try {
+            val file = File(filePath)
+            val document = PDDocument.load(file)
+
+            val stripper = PDFTextStripper()
+            val text = stripper.getText(document)
+
+            document.close()
+
+            // Cleanup whitespace
+            text.trim()
+        } catch (e: Exception) {
+            println("❌ Error extract PDF: ${e.message}")
+            e.printStackTrace()
+            null
+        }
+    }
+
+    // Extract text dari PDF (sebelum disimpan)
+    fun extractTextFromPdfUri(context: Context, uri: Uri): String? {
+        return try {
+            val inputStream = context.contentResolver.openInputStream(uri)
+            val document = PDDocument.load(inputStream)
+
+            val stripper = PDFTextStripper()
+            val text = stripper.getText(document)
+
+            document.close()
+            inputStream?.close()
+
+            text.trim()
+        } catch (e: Exception) {
+            println("❌ Error extract PDF from URI: ${e.message}")
+            e.printStackTrace()
+            null
+        }
+    }
+
+    // Get info PDF (jumlah halaman, dll)
+    fun getPdfInfo(filePath: String): PdfInfo? {
+        return try {
+            val file = File(filePath)
+            val document = PDDocument.load(file)
+
+            val info = PdfInfo(
+                pageCount = document.numberOfPages,
+                title = document.documentInformation.title ?: "Unknown",
+                author = document.documentInformation.author ?: "Unknown"
+            )
+
+            document.close()
+            info
+        } catch (e: Exception) {
+            null
+        }
+    }
+}
+
+data class PdfInfo(
+    val pageCount: Int,
+    val title: String,
+    val author: String
+)

app/src/main/java/com/example/notebook/viewmodel/NotebookViewModel.kt

@@ -0,0 +1,398 @@
+package com.example.notebook.viewmodel
+
+import android.app.Application
+import androidx.lifecycle.AndroidViewModel
+import androidx.lifecycle.viewModelScope
+import com.example.notebook.api.GeminiRepository
+import com.example.notebook.data.AppDatabase
+import com.example.notebook.data.NotebookEntity
+import com.example.notebook.data.NotebookRepository
+import com.example.notebook.data.SourceEntity
+import com.example.notebook.data.ChatMessageEntity
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+
+/**
+ * ViewModel untuk manage state aplikasi
+ * Semua logic business ada di sini
+ */
+class NotebookViewModel(application: Application) : AndroidViewModel(application) {
+
+    private val repository: NotebookRepository
+    private val geminiRepository = GeminiRepository()
+
+    // State untuk list notebooks
+    private val _notebooks = MutableStateFlow<List<NotebookEntity>>(emptyList())
+    val notebooks: StateFlow<List<NotebookEntity>> = _notebooks.asStateFlow()
+
+    // State untuk notebook yang sedang aktif
+    private val _currentNotebook = MutableStateFlow<NotebookEntity?>(null)
+    val currentNotebook: StateFlow<NotebookEntity?> = _currentNotebook.asStateFlow()
+
+    // State untuk sources dalam notebook aktif
+    private val _sources = MutableStateFlow<List<SourceEntity>>(emptyList())
+    val sources: StateFlow<List<SourceEntity>> = _sources.asStateFlow()
+
+    // State untuk chat history
+    private val _chatMessages = MutableStateFlow<List<ChatMessageEntity>>(emptyList())
+    val chatMessages: StateFlow<List<ChatMessageEntity>> = _chatMessages.asStateFlow()
+
+    // State loading
+    private val _isLoading = MutableStateFlow(false)
+    val isLoading: StateFlow<Boolean> = _isLoading.asStateFlow()
+
+    // State error
+    private val _errorMessage = MutableStateFlow<String?>(null)
+    val errorMessage: StateFlow<String?> = _errorMessage.asStateFlow()
+
+    init {
+        val database = AppDatabase.getDatabase(application)
+        repository = NotebookRepository(database.notebookDao())
+        loadNotebooks()
+    }
+
+    // === NOTEBOOK FUNCTIONS ===
+
+    private fun loadNotebooks() {
+        viewModelScope.launch {
+            repository.getAllNotebooks().collect { notebooks ->
+                _notebooks.value = notebooks
+            }
+        }
+    }
+
+    fun createNotebook(title: String, description: String = "") {
+        viewModelScope.launch {
+            _isLoading.value = true
+            try {
+                val notebookId = repository.createNotebook(title, description)
+                println("✅ Notebook berhasil dibuat dengan ID: $notebookId")
+            } catch (e: Exception) {
+                println("❌ Error membuat notebook: ${e.message}")
+            } finally {
+                _isLoading.value = false
+            }
+        }
+    }
+
+    fun selectNotebook(notebookId: Int) {
+        println("📂 selectNotebook dipanggil dengan ID: $notebookId")
+        viewModelScope.launch {
+            repository.getNotebookById(notebookId).collect { notebook ->
+                println("📖 Notebook data: ${notebook?.title ?: "NULL"}")
+                _currentNotebook.value = notebook
+                notebook?.let {
+                    println("📦 Loading sources untuk notebook ID: $notebookId")
+                    loadSources(notebookId)
+                    println("💬 Loading chat history untuk notebook ID: $notebookId")
+                    loadChatHistory(notebookId)
+                }
+            }
+        }
+    }
+
+    fun updateNotebook(notebook: NotebookEntity) {
+        viewModelScope.launch {
+            repository.updateNotebook(notebook)
+        }
+    }
+
+    fun deleteNotebook(notebook: NotebookEntity) {
+        viewModelScope.launch {
+            repository.deleteNotebook(notebook)
+        }
+    }
+
+    // === SOURCE FUNCTIONS ===
+
+    private fun loadSources(notebookId: Int) {
+        viewModelScope.launch {
+            repository.getSourcesByNotebook(notebookId).collect { sources ->
+                _sources.value = sources
+            }
+        }
+    }
+
+    fun addSource(
+        notebookId: Int,
+        fileName: String,
+        fileType: String,
+        filePath: String
+    ) {
+        viewModelScope.launch {
+            _isLoading.value = true
+            try {
+                repository.addSource(notebookId, fileName, fileType, filePath)
+                println("✅ Source berhasil ditambahkan: $fileName")
+            } catch (e: Exception) {
+                println("❌ Error menambahkan source: ${e.message}")
+            } finally {
+                _isLoading.value = false
+            }
+        }
+    }
+
+    fun uploadFile(context: android.content.Context, uri: android.net.Uri, notebookId: Int) {
+        viewModelScope.launch {
+            _isLoading.value = true
+            try {
+                val fileName = com.example.notebook.utils.FileHelper.getFileName(context, uri) ?: "unknown"
+                val filePath = com.example.notebook.utils.FileHelper.copyFileToInternalStorage(context, uri, notebookId)
+
+                if (filePath != null) {
+                    val fileType = com.example.notebook.utils.FileHelper.getFileType(fileName)
+                    repository.addSource(notebookId, fileName, fileType, filePath)
+                    println("✅ File berhasil diupload: $fileName")
+                } else {
+                    println("❌ Error: Gagal menyimpan file")
+                }
+            } catch (e: Exception) {
+                println("❌ Error upload file: ${e.message}")
+            } finally {
+                _isLoading.value = false
+            }
+        }
+    }
+
+    fun deleteSource(source: SourceEntity) {
+        viewModelScope.launch {
+            _isLoading.value = true
+            try {
+                repository.deleteSource(source)
+                com.example.notebook.utils.FileHelper.deleteFile(source.filePath)
+                println("✅ Source berhasil dihapus: ${source.fileName}")
+            } catch (e: Exception) {
+                println("❌ Error menghapus source: ${e.message}")
+            } finally {
+                _isLoading.value = false
+            }
+        }
+    }
+
+    // === CHAT FUNCTIONS ===
+
+    private fun loadChatHistory(notebookId: Int) {
+        viewModelScope.launch {
+            repository.getChatHistory(notebookId).collect { messages ->
+                _chatMessages.value = messages
+            }
+        }
+    }
+
+    fun sendUserMessage(notebookId: Int, message: String) {
+        viewModelScope.launch {
+            _isLoading.value = true
+            try {
+                // Simpan pesan user
+                repository.sendMessage(notebookId, message, isUserMessage = true)
+
+                // Cek apakah ada PDF
+                val pdfSources = _sources.value.filter { it.fileType == "PDF" }
+                val textSources = _sources.value.filter { it.fileType in listOf("Text", "Markdown") }
+
+                if (pdfSources.isEmpty() && textSources.isEmpty()) {
+                    val reply = "Maaf, belum ada dokumen yang diupload. Silakan upload dokumen terlebih dahulu untuk bisa bertanya."
+                    repository.sendMessage(notebookId, reply, isUserMessage = false)
+                    return@launch
+                }
+
+                println("📊 Q&A - PDF: ${pdfSources.size}, Text: ${textSources.size}")
+
+                // Build chat history
+                val chatHistory = _chatMessages.value
+                    .takeLast(10)
+                    .windowed(2, 2, partialWindows = false)
+                    .mapNotNull { messages ->
+                        if (messages.size == 2 && messages[0].isUserMessage && !messages[1].isUserMessage) {
+                            Pair(messages[0].message, messages[1].message)
+                        } else null
+                    }
+
+                // PATTERN SAMA dengan generateSummary
+                if (pdfSources.isNotEmpty()) {
+                    val pdfSource = pdfSources.first()
+                    println("📄 Q&A Processing PDF: ${pdfSource.fileName}")
+
+                    // Extract dengan Dispatchers.IO
+                    val extractedText = withContext(kotlinx.coroutines.Dispatchers.IO) {
+                        com.example.notebook.utils.FileHelper.readTextFromFile(pdfSource.filePath)
+                    }
+
+                    if (extractedText != null && extractedText.length > 100) {
+                        println("✅ Q&A: Using extracted text (${extractedText.length} chars)")
+
+                        // Build context DENGAN Dispatchers.IO
+                        val documentContext = withContext(kotlinx.coroutines.Dispatchers.IO) {
+                            buildDocumentContext()
+                        }
+
+                        val result = geminiRepository.chatWithDocument(
+                            userMessage = message,
+                            documentContext = documentContext,
+                            chatHistory = chatHistory
+                        )
+                        handleChatResult(notebookId, result)
+                    } else {
+                        println("⚠️ Using Gemini Vision (${extractedText?.length ?: 0} chars)")
+                        val result = geminiRepository.chatWithPdfFile(
+                            userMessage = message,
+                            pdfFilePath = pdfSource.filePath,
+                            pdfFileName = pdfSource.fileName,
+                            chatHistory = chatHistory
+                        )
+                        handleChatResult(notebookId, result)
+                    }
+                } else {
+                    println("📝 Q&A using text files only")
+                    val documentContext = buildDocumentContext()
+                    val result = geminiRepository.chatWithDocument(
+                        userMessage = message,
+                        documentContext = documentContext,
+                        chatHistory = chatHistory
+                    )
+                    handleChatResult(notebookId, result)
+                }
+
+            } catch (e: Exception) {
+                println("❌ Error Q&A: ${e.message}")
+                e.printStackTrace()
+                val errorMsg = "Maaf, terjadi error: ${e.message}"
+                repository.sendMessage(notebookId, errorMsg, isUserMessage = false)
+                _errorMessage.value = e.message
+            } finally {
+                _isLoading.value = false
+            }
+        }
+    }
+
+    private suspend fun handleChatResult(notebookId: Int, result: Result<String>) {
+        result.fold(
+            onSuccess = { aiResponse ->
+                repository.sendMessage(notebookId, aiResponse, isUserMessage = false)
+                println("✅ AI response: ${aiResponse.take(50)}...")
+            },
+            onFailure = { error ->
+                val errorMsg = "Maaf, terjadi error: ${error.message}"
+                repository.sendMessage(notebookId, errorMsg, isUserMessage = false)
+                println("❌ Error: ${error.message}")
+                _errorMessage.value = error.message
+            }
+        )
+    }
+
+    fun clearChatHistory(notebookId: Int) {
+        viewModelScope.launch {
+            repository.clearChatHistory(notebookId)
+        }
+    }
+
+    //  GEMINI FUNCTIONS
+
+    private fun buildDocumentContext(): String {
+        val context = StringBuilder()
+
+        println("🔍 Building document context dari ${_sources.value.size} sources")
+
+        _sources.value.forEach { source ->
+            println("📋 Source: ${source.fileName} | Type: ${source.fileType}")
+
+            when (source.fileType) {
+                "Text", "Markdown", "PDF" -> {  // ← TAMBAH "PDF" DI SINI!
+                    val content = com.example.notebook.utils.FileHelper.readTextFromFile(source.filePath)
+                    if (content != null && content.isNotBlank()) {
+                        context.append("=== ${source.fileName} ===\n")
+                        context.append(content)
+                        context.append("\n\n")
+                        println("✅ Extracted ${content.length} chars from ${source.fileName}")
+                    } else {
+                        println("⚠️ Failed to extract from ${source.fileName}")
+                    }
+                }
+                else -> {
+                    println("⚠️ File type ${source.fileType} not supported")
+                    context.append("=== ${source.fileName} ===\n")
+                    context.append("[File type ${source.fileType} - content extraction not yet supported]\n\n")
+                }
+            }
+        }
+
+        println("📦 Total context length: ${context.length} chars")
+        return context.toString()
+    }
+
+    fun generateSummary(notebookId: Int) {
+        viewModelScope.launch {
+            _isLoading.value = true
+            try {
+                // Cek apakah ada PDF
+                val pdfSources = _sources.value.filter { it.fileType == "PDF" }
+                val textSources = _sources.value.filter { it.fileType in listOf("Text", "Markdown") }
+
+                if (pdfSources.isEmpty() && textSources.isEmpty()) {
+                    _errorMessage.value = "Tidak ada dokumen untuk diringkas"
+                    return@launch
+                }
+
+                // Untuk PDF, coba extract dulu
+                if (pdfSources.isNotEmpty()) {
+                    val pdfSource = pdfSources.first()
+                    println("📄 Processing PDF: ${pdfSource.fileName}")
+
+//                    val extractedText = com.example.notebook.utils.FileHelper.readTextFromFile(pdfSource.filePath)
+                    val extractedText = kotlinx.coroutines.withContext(kotlinx.coroutines.Dispatchers.IO) {
+                        com.example.notebook.utils.FileHelper.readTextFromFile(pdfSource.filePath)
+                    }
+                    if (extractedText != null && extractedText.length > 100) {
+                        // Text extraction berhasil
+                        println("✅ Using extracted text (${extractedText.length} chars)")
+                        val result = geminiRepository.generateSummary(extractedText)
+                        handleSummaryResult(notebookId, result)
+                    } else {
+                        // Text extraction gagal/terlalu pendek, pakai Gemini Vision
+                        println("⚠️ Extracted text too short (${extractedText?.length ?: 0} chars), using Gemini Vision")
+                        val result = geminiRepository.generateSummaryFromPdfFile(
+                            pdfSource.filePath,
+                            pdfSource.fileName
+                        )
+                        handleSummaryResult(notebookId, result)
+                    }
+                } else {
+                    // Hanya text files
+                    val documentContext = buildDocumentContext()
+                    val result = geminiRepository.generateSummary(documentContext)
+                    handleSummaryResult(notebookId, result)
+                }
+
+            } catch (e: Exception) {
+                _errorMessage.value = e.message
+                println("❌ Error: ${e.message}")
+            } finally {
+                _isLoading.value = false
+            }
+        }
+    }
+
+    private suspend fun handleSummaryResult(notebookId: Int, result: Result<String>) {
+        result.fold(
+            onSuccess = { summary ->
+                repository.sendMessage(
+                    notebookId,
+                    "📝 Ringkasan Dokumen:\n\n$summary",
+                    isUserMessage = false
+                )
+                println("✅ Summary berhasil: ${summary.take(100)}...")
+            },
+            onFailure = { error ->
+                _errorMessage.value = "Error generate summary: ${error.message}"
+                println("❌ Error generate summary: ${error.message}")
+            }
+        )
+    }
+
+    fun clearError() {
+        _errorMessage.value = null
+    }
+}

app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -2,5 +2,4 @@
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background"/>
     <foreground android:drawable="@drawable/ic_launcher_foreground"/>
-    <monochrome android:drawable="@drawable/ic_launcher_foreground" />
 </adaptive-icon>

app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -2,5 +2,4 @@
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background"/>
     <foreground android:drawable="@drawable/ic_launcher_foreground"/>
-    <monochrome android:drawable="@drawable/ic_launcher_foreground" />
 </adaptive-icon>

app/src/main/res/values/strings.xml

@@ -1,3 +1,3 @@
 <resources>
-    <string name="app_name">Notebook</string>
+    <string name="app_name">NotesAI</string>
 </resources>

app/src/main/res/xml/file_paths.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<paths xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- Internal storage files -->
+    <files-path name="internal_files" path="." />
+
+    <!-- Notebook files -->
+    <files-path name="notebooks" path="notebooks/" />
+
+    <!-- Cache -->
+    <cache-path name="cache" path="." />
+</paths>