import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.Button
import androidx.compose.material3.Card
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Text
import androidx.compose.material3.darkColorScheme
import androidx.compose.material3.lightColorScheme
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp

private val LightColorScheme = lightColorScheme(
    primary = Color(0xFF6200EE),
    onPrimary = Color.White,
    secondary = Color(0xFF03DAC6),
    onSecondary = Color.Black,
    background = Color(0xFFF5F5F5),
    onBackground = Color.Black,
    surface = Color.White,
    onSurface = Color.Black
)

private val DarkColorScheme = darkColorScheme(
    primary = Color(0xFFBB86FC),
    onPrimary = Color.Black,
    secondary = Color(0xFF03DAC6),
    onSecondary = Color.Black,
    background = Color(0xFF121212),
    onBackground = Color.White,
    surface = Color(0xFF1E1E1E),
    onSurface = Color.White
)

@Composable
fun ThemeChange() {
    var isDarkTheme by remember { mutableStateOf(false) }

    val colorScheme = if (isDarkTheme) DarkColorScheme else LightColorScheme

    MaterialTheme(colorScheme = colorScheme) {
        Column(
            modifier = Modifier
                .fillMaxSize()
                .background(MaterialTheme.colorScheme.background)
                .padding(16.dp),
            verticalArrangement = Arrangement.spacedBy(16.dp, Alignment.CenterVertically),
            horizontalAlignment = Alignment.CenterHorizontally
        ) {
            Card(
                modifier = Modifier.fillMaxWidth(),
            ) {
                Column(
                    modifier = Modifier.padding(16.dp),
                    verticalArrangement = Arrangement.spacedBy(8.dp)
                ) {
                    Text(
                        text = "Current Theme:",
                        fontSize = 18.sp,
                        fontWeight = FontWeight.Bold
                    )
                    Text(
                        text = if (isDarkTheme) "🌙 Dark Mode" else "☀️ Light Mode",
                        fontSize = 24.sp,
                        color = MaterialTheme.colorScheme.primary
                    )
                }
            }

            Button(
                onClick = { isDarkTheme = !isDarkTheme },
                modifier = Modifier.fillMaxWidth()
            ) {
                Text(
                    text = if (isDarkTheme) "Switch to Light Theme" else "Switch to Dark Theme",
                    fontSize = 16.sp
                )
            }
        }
    }
}