package com.example.composesokobantemplatev2

import android.graphics.BitmapFactory
import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.activity.enableEdgeToEdge
import androidx.compose.foundation.Canvas
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.Scaffold
import androidx.compose.runtime.Composable
import androidx.compose.runtime.remember
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.ImageBitmap
import androidx.compose.ui.graphics.asImageBitmap
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.IntOffset
import androidx.compose.ui.unit.IntSize
import androidx.compose.ui.unit.dp
import com.example.composesokobantemplatev2.ui.theme.ComposeSokobanTemplateV2Theme
import kotlin.math.roundToInt

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        enableEdgeToEdge()
        setContent {
            ComposeSokobanTemplateV2Theme {
                Scaffold(modifier = Modifier.fillMaxSize()) { innerPadding ->
                    GameScreen(modifier = Modifier.padding(innerPadding))
                }
            }
        }
    }
}

private const val LEVEL_WIDTH = 10
private const val LEVEL_HEIGHT = 10

// Data levelu
private val levelData = intArrayOf(
    1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
    1, 0, 0, 0, 0, 0, 0, 0, 1, 0,
    1, 0, 2, 3, 3, 2, 1, 0, 1, 0,
    1, 0, 1, 3, 2, 3, 2, 0, 1, 0,
    1, 0, 2, 3, 3, 2, 4, 0, 1, 0,
    1, 0, 1, 3, 2, 3, 2, 0, 1, 0,
    1, 0, 2, 3, 3, 2, 1, 0, 1, 0,
    1, 0, 0, 0, 0, 0, 0, 0, 1, 0,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0
)

@Composable
fun GameScreen(modifier: Modifier = Modifier) {
    Box(
        modifier = modifier
    ) {
        GameLevelCanvas(levelData = levelData.toList())
    }
}

@Composable
fun GameLevelCanvas(levelData: List<Int>, modifier: Modifier = Modifier) {
    val context = LocalContext.current

    val tiles = remember {
        arrayOf(
            BitmapFactory.decodeResource(context.resources, R.drawable.empty).asImageBitmap(), // 0
            BitmapFactory.decodeResource(context.resources, R.drawable.wall).asImageBitmap(),  // 1
            BitmapFactory.decodeResource(context.resources, R.drawable.box).asImageBitmap(),   // 2
            BitmapFactory.decodeResource(context.resources, R.drawable.goal).asImageBitmap(),  // 3
            BitmapFactory.decodeResource(context.resources, R.drawable.hero).asImageBitmap(),  // 4
            BitmapFactory.decodeResource(context.resources, R.drawable.boxok).asImageBitmap()  // 5
        )
    }

    Canvas(modifier = modifier.fillMaxSize()) {
        val tileWidthPx = size.width / LEVEL_WIDTH
        val tileHeightPx = size.height / LEVEL_HEIGHT
        val tileSize = minOf(tileWidthPx, tileHeightPx)

        for (y in 0 until LEVEL_HEIGHT) {
            for (x in 0 until LEVEL_WIDTH) {
                val tileIndex = levelData[y * LEVEL_WIDTH + x]
                val img: ImageBitmap = tiles[tileIndex.coerceIn(0, tiles.lastIndex)]

                drawImage(
                    image = img,
                    dstOffset = IntOffset(
                        x = (x * tileSize).roundToInt(),
                        y = (y * tileSize).roundToInt()
                    ),
                    dstSize = IntSize(
                        width = tileSize.roundToInt(),
                        height = tileSize.roundToInt()
                    )
                )
            }
        }
    }
}

@Preview(showBackground = true, showSystemUi = true)
@Composable
fun GameLevelCanvasPreview() {
    ComposeSokobanTemplateV2Theme {
        GameScreen()
    }
}