// RandomCircles Example
// Source code file: MainActivity.kt
// Draw 100 random circles using 7 colors.
// Redraw 100 more random circles when
// the button is clicked.

package it372.ssmith.circlesfromfile
import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.activity.enableEdgeToEdge
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.padding
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.foundation.Canvas
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.size
import androidx.compose.ui.Alignment
import androidx.compose.ui.draw.clipToBounds
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.drawscope.Stroke
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp

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

@Composable
fun MainLayout( ) {
    val context = LocalContext.current
    Column(
        modifier = Modifier.padding(20.dp)
            .background(Color(0xFFE0E0E0))
            .fillMaxSize(),
        horizontalAlignment = Alignment.CenterHorizontally
    )
    {
        Canvas(
            modifier = Modifier
                .padding(10.dp)
                .size(350.dp, 350.dp)
                .background(Color(0xFFC0C0C0))
                .clipToBounds( )
                .fillMaxSize( ))
        {
            // Read circle specs from
            // res/raw/circles.txt
            var line = ""
            // Use these colors to fill circles.
            val colors = listOf(Color.Red, Color.Yellow,
                Color.Green, Color.Cyan, Color.Blue,
                Color.Magenta)
            val inputStream = context.resources.
                openRawResource(R.raw.circles)
            inputStream.bufferedReader().useLines {
                it.forEach {
                    // Each line contains specs for one
                    // circle.
                    line = it
                    var fields = line.split(",")
                    var x = fields[0].toFloat( )
                    var y = fields[1].toFloat( )
                    var r = fields[2].toFloat( )
                    var color = colors[fields[3].toInt( )]

                    // Draw filled circle.
                    drawCircle(
                        color = color,
                        radius = r,
                        center = Offset(x = x, y = y)
                    )

                    // Draw circle border.
                    drawCircle(
                        color = Color.Black,
                        radius = r,
                        center = Offset(x = x, y = y),
                        style = Stroke(5f)
                    )
                }
            }
        }
    }
}

@Preview(showBackground = true)
@Composable
fun MainLayoutPreview() {
    MainLayout()
}