SelectionSortTugas3/MainActivity.kt

package com.example.Kalkulator

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.foundation.lazy.items
import androidx.compose.material3.Button
import androidx.compose.material3.OutlinedTextField
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBar
import androidx.compose.material3.TopAppBarDefaults
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            SelectionSortApp()
        }
    }
}

@Composable
fun SelectionSortApp() {
    var inputText by remember { mutableStateOf("") }
    var numbers by remember { mutableStateOf(listOf<Int>()) }
    var sortedNumbers by remember { mutableStateOf(listOf<Int>()) }

    fun selectionSort(list: List<Int>): List<Int> {
        val arr = list.toMutableList()
        for (i in 0 until arr.size - 1) {
            var minIndex = i
            for (j in i + 1 until arr.size) {
                if (arr[j] < arr[minIndex]) {
                    minIndex = j
                }
            }
            // Tukar posisi elemen
            val temp = arr[i]
            arr[i] = arr[minIndex]
            arr[minIndex] = temp
        }
        return arr
    }

    Scaffold(
        topBar = {
            TopAppBar(
                title = { Text("Selection Sort Demo") },
                colors = TopAppBarDefaults.topAppBarColors(
                    containerColor = Color(0xFF1565C0),
                    titleContentColor = Color.White
                )
            )
        }
    ) { padding ->
        Column(
            modifier = Modifier
                .padding(padding)
                .fillMaxSize()
                .padding(16.dp),
            horizontalAlignment = Alignment.CenterHorizontally
        ) {
            Text(
                "Masukkan angka dipisahkan dengan koma (contoh: 5,3,8,1,4)",
                fontSize = 16.sp
            )

            Spacer(modifier = Modifier.height(10.dp))

            OutlinedTextField(
                value = inputText,
                onValueChange = { inputText = it },
                label = { Text("Input Angka") },
                singleLine = true,
                modifier = Modifier.fillMaxWidth()
            )

            Spacer(modifier = Modifier.height(16.dp))

            Button(onClick = {
                try {
                    numbers = inputText.split(",").map { it.trim().toInt() }
                    sortedNumbers = selectionSort(numbers)
                } catch (e: Exception) {
                    sortedNumbers = emptyList()
                }
            }) {
                Text("Urutkan (Selection Sort)")
            }

            Spacer(modifier = Modifier.height(20.dp))

            if (sortedNumbers.isNotEmpty()) {
                Text("Hasil Pengurutan:", fontWeight = FontWeight.Bold, fontSize = 18.sp)
                Spacer(modifier = Modifier.height(8.dp))
                LazyColumn {
                    items(sortedNumbers) { num ->
                        Box(
                            modifier = Modifier
                                .fillMaxWidth()
                                .padding(4.dp)
                                .background(Color(0xFFBBDEFB))
                                .padding(12.dp)
                        ) {
                            Text(text = num.toString(), fontSize = 20.sp)
                        }
                    }
                }
            }
        }
    }
}