import android.os.Bundle
import androidx.activity.compose.setContent
import androidx.appcompat.app.AppCompatActivity
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.material.*
import androidx.compose.runtime.*
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.unit.dp
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.Add


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

@Composable
fun MyApp() {
    val context = LocalContext.current
    val scaffoldState = rememberScaffoldState()

    MaterialTheme {
        Scaffold(
            scaffoldState = scaffoldState,
            topBar = {
                TopAppBar(
                    title = { Text(text = "Community Issues") }
                )
            },
            floatingActionButton = {
                FloatingActionButton(
                    onClick = {
                        // Call showSnackbar from a coroutine
                        CoroutineScope(Dispatchers.Main).launch {
                            scaffoldState.snackbarHostState.showSnackbar("Feature not implemented yet!")
                        }
                    },
                    content = { Icon(Icons.Default.Add, contentDescription = "Raise an issue") }
                )
            },
            content = {
                // Apply padding to the content
                Box(modifier = Modifier.padding(it)) {
                    IssueList()
                }
            }
        )
    }
}

@Composable
fun IssueList() {
    val sampleIssues = listOf(
        "Water Leakage",
        "Street Lights Not Working",
        "Garbage Collection Issue"
    )

    LazyColumn(
        modifier = Modifier
            .fillMaxSize()
    ) {
        items(sampleIssues) { issue ->
            IssueCard(issue)
            Spacer(modifier = Modifier.height(16.dp))
        }
    }
}

@Composable
fun IssueCard(issue: String) {
    Card(
        modifier = Modifier.fillMaxWidth(),
        elevation = 4.dp,
        backgroundColor = Color.White
    ) {
        Column(
            modifier = Modifier
                .padding(16.dp)
        ) {
            Text(text = issue)
        }
    }
}

Kotlin online compiler

Write, Run & Share Kotlin code online using OneCompiler’s Kotlin online compiler for free. It’s a modern and fast online playground for Kotlin, supporting the latest version and ideal for learning, experimenting, and sharing code instantly.

About Kotlin

Kotlin is a statically typed, modern programming language developed by JetBrains. It runs on the JVM and is fully interoperable with Java. Kotlin is concise, expressive, and safe, and it’s officially supported by Google for Android app development.

Sample Code

The following is a simple Kotlin program that prints a greeting:

fun main() {
    println("Hello, OneCompiler!")
}

Taking inputs (stdin)

OneCompiler’s Kotlin editor supports stdin. You can provide input using the I/O tab. Here's a sample program that reads a line of input and prints a greeting:

fun main() {
    print("Enter your name: ")
    val name = readLine()
    println("Hello, $name")
}

Syntax Basics

Variables

val name: String = "OneCompiler"  // Immutable
var age: Int = 25                 // Mutable

Kotlin supports type inference, so explicit types are optional:

val city = "Hyderabad"
var count = 10

Conditionals

val score = 85
if (score >= 50) {
    println("Pass")
} else {
    println("Fail")
}

Loops

For loop

for (i in 1..5) {
    println(i)
}

While loop

var i = 1
while (i <= 5) {
    println(i)
    i++
}

Do-While loop

var j = 1
do {
    println(j)
    j++
} while (j <= 5)

Functions

fun add(a: Int, b: Int): Int {
    return a + b
}

fun greet(name: String) = "Hello, $name"

Collections

val items = listOf("apple", "banana", "cherry")
for (item in items) {
    println(item)
}

This guide provides a quick reference to Kotlin programming syntax and features. Start coding in Kotlin using OneCompiler’s Kotlin online compiler today!