// WriteToFile Example
// Source code file: MainActivity.kt
// Write to, read from, and delete a file
// named demofile.txt in internal storage.

package it372.ssmith.writetofile
import android.content.Context
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.material3.Button
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
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.io.File
import java.io.FileOutputStream

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

@Composable
fun MainScreen( ) {


     var fileName = remember {
         mutableStateOf("demofile.txt") }
     var ctxt = LocalContext.current
     var context = remember {
         mutableStateOf<Context>(ctxt)
     }
     var output = remember {
         mutableStateOf("") }

     Column(modifier = Modifier
         .padding(all = 40.dp)) {

         // Write to File
         MyButton(clickListener = {
             val file = File(context.value.filesDir,
                 fileName.value)
             FileOutputStream(file, true).bufferedWriter( )
                 .use { it.append("Sample text to append.\n") }
             output.value =
                 "Output saved to File: ${file.absolutePath}"
         }, content = "Write to File")

         // Read from File
         MyButton(clickListener = {
             val file = File(context.value.filesDir,
                 fileName.value)
             output.value = if (file.exists( )) file.readText( )
                 else "File not found"
         }, content = "Read from File")

         // Delete file.
         MyButton(clickListener = {
             val file = File(context.value.filesDir,
                 fileName.value)
             if (file.exists( )) {
                 val deleted = file.delete( )
                 output.value = if (deleted) "File Deleted"
                     else "File not Deleted"
             }
         }, content = "Delete File")

         Text(text = output.value,
             fontSize = 30.sp)
     }
}

@Composable
fun MyButton(clickListener : ( ) -> Unit,
    content : String) {
    Button(clickListener,
            modifier = Modifier.padding(bottom = 30.dp)) {
        Text(text = content, fontSize = 25.sp)
    }
}

@Preview(showBackground = true)
@Composable
fun MainScreenPreview() {
    MainScreen( )
}