// GroceryItemsMap Example
// Source code file: MainActivity.kt

package it372.ssmith.groceryitemsmap
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.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.material3.Button
import androidx.compose.material3.Text
import androidx.compose.material3.TextField
import androidx.compose.runtime.Composable
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.ui.Modifier
import androidx.compose.ui.text.TextStyle
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 items = mapOf<Int, GroceryItem>(
        34567 to GroceryItem("Cabbage", 34567, 2.59),
        46576 to GroceryItem("Tomatos", 46576, 3.55),
        76543 to GroceryItem("Onions", 76543, 2.58)
    )
    var tfKey = remember { mutableStateOf("0") }
    var textContents = remember { mutableStateOf("") }
    Column(modifier = Modifier.padding(all = 40.dp)) {

        // Textfield contains a length in inches.
        val valueInch = null
        TextField(value = tfKey.value,
            label = { Text("Enter key for groceries map:") },
            onValueChange = {
                tfKey.value = it
            },
            modifier = Modifier
                .padding(bottom = 50.dp, top = 50.dp,
                    start = 20.dp,  end = 20.dp)
                .size(width = 200.dp, height = 75.dp)
                .fillMaxWidth( ),
            textStyle = TextStyle.Default.copy(fontSize = 28.sp)
        )

        Button(
            onClick = {
                var key = 0
                tfKey.value.toIntOrNull( )?.let {
                    key = it
                }
                textContents.value = if (key in items) items[key].toString( )
                else ""
            },
            modifier = Modifier.padding(all = 50.dp)) {
                Text("Show Grocery Item")
            }

        Text(text = textContents.value)
    }
}

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