//Tip Calculator

package com.example.tip

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.height
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.Button
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.material3.TextField
import androidx.compose.runtime.Composable
import androidx.compose.runtime.mutableStateOf
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.tooling.preview.Preview
import com.example.tip.ui.theme.TipTheme
import androidx.compose.runtime.remember
import androidx.compose.runtime.getValue
import androidx.compose.runtime.setValue
import androidx.compose.ui.unit.dp
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.fillMaxWidth


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

@Composable
fun TipCalculator(){
    var amount by remember { mutableStateOf("") }
    var tipPercentage by remember { mutableStateOf("") }
    var tipAmount by remember { mutableStateOf(0) }

    Column(
        modifier = Modifier.fillMaxSize()
                    .padding(16.dp),
        horizontalAlignment = Alignment.CenterHorizontally,
        verticalArrangement = Arrangement.Center
    )
    {
        TextField(value = amount,
            onValueChange = {newAmount -> amount = newAmount},
            modifier = Modifier.fillMaxWidth(),
            label = {Text("Enter your total Bill:")})


        Spacer(modifier = Modifier.height(16.dp))


        TextField(value = tipPercentage,
            onValueChange = {newTipPercentage -> tipPercentage = newTipPercentage},
            modifier = Modifier.fillMaxWidth(),
            label = {Text("Enter tip percentage:")})

        Spacer(modifier = Modifier.height(16.dp))

        Button(
            modifier = Modifier.fillMaxWidth(),
            onClick ={
            val billAmount = amount.toIntOrNull() ?: 0
            val tip = tipPercentage.toIntOrNull() ?: 0

            tipAmount = (tip * billAmount)/100 })
        {
            Text(text = "Calculate Tip")
        }

        Spacer(modifier = Modifier.height(16.dp))

        Text(text = "Your tip amount is: $tipAmount")
    }
}