// TheRaven Example
// Source file: MainActivity.kt
// Display the Edgar Allan Poe poem The Raven in 
// a scrollable column. Create a new directory named 
// raw in the res folder, then copy theraven.txt 
// file into that directory.

package it372.ssmith.theraven2
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.fillMaxSize
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.rememberScrollState
import androidx.compose.foundation.verticalScroll
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
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
import java.util.Scanner

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

@Composable
fun Layout( ) {

    // A Column needs a variable to keep track
    // of the scroll state.
    var scrollState = rememberScrollState( )

    Column(modifier = Modifier
        .padding(20.dp)
        .verticalScroll(scrollState)
        .fillMaxSize( )) {

        var output = ""
        val context = LocalContext.current
        val inputStream = context.resources.openRawResource(R.raw.theraven)
        val scanner = Scanner(inputStream)
        while (scanner.hasNextLine( )) {
            output += scanner.nextLine() + "\n"
        }

        Text(
            text = output,
            modifier = Modifier.padding(8.dp),
            fontSize = 12.sp
        )
    }
}

@Preview(showBackground = true)
@Composable
fun GreetingPreview() {
    Layout()
}