// Proj4Exa Example
// Source code file: MainActivity.kt
// Load GroceryItem array from strings.xml
// resource file, display the items in
// a Text element, and save the items as
// a string in an internal file of the
// emulator.

package it372.ssmith.proj4exa
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.mutableStateListOf
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.res.stringArrayResource
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 {
            MainLayout( )
        }
    }
}

@Composable
fun MainLayout( ) {
    val groceryArray = stringArrayResource(R.array.grocery_items)
    var groceryMutableList = remember {
        mutableStateListOf<String>( )
    }
    var displayText = remember { mutableStateOf("") }
    val context = LocalContext.current

    Column(modifier = Modifier
        .padding(all = 20.dp),
        horizontalAlignment = Alignment.Start) {

        Button(onClick =  {
            val groceryList = groceryArray.toList( )
            for(item in groceryList) {
                groceryMutableList.add(item)
            }

        }, modifier = Modifier
            .padding(all = 20.dp)) {

            Text(text = "Load", fontSize = 30.sp)
        }

        Button(onClick =  {
            var display = ""
            for (s in groceryMutableList) {
                val sArray = s.split(";")
                val desc = sArray[0]
                val code = sArray[1]
                val price = sArray[2]
                display += "Description: $desc\n" +
                    "Code: $code\n" +
                    "Price: $price\n\n"
            }

            displayText.value = display

        }, modifier = Modifier
            .padding(all = 20.dp)) {

            Text(text = "Display", fontSize = 30.sp)
        }

        Button(onClick =  {
            var groceryString = "["
            for(s in groceryMutableList) {
                groceryString += s + ","
            }
            var len = groceryString.length
            groceryString = groceryString.substring(0, len - 1)
            groceryString += "]"
            var s = groceryString

            var fileName = "groceryString.txt"
            val file = File(context.filesDir, fileName)
            FileOutputStream(file, false).bufferedWriter( )
                .use { it.write(groceryString) }

        }, modifier = Modifier
            .padding(all = 20.dp)) {

            Text(text = "Save", fontSize = 30.sp)
        }

        Text(text = displayText.value)
    }
}

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