---

package com.monika.orangesky

import androidx.compose.foundation.background
import androidx.compose.foundation.layout.*
import androidx.compose.material3.*
import androidx.compose.runtime.*
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.text.input.PasswordVisualTransformation
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp

@Composable
fun LoginScreen(onLoginSuccess: () -> Unit, onNavigateToRegister: () -> Unit) {
    var email by remember { mutableStateOf("") }
    var password by remember { mutableStateOf("") }
    var error by remember { mutableStateOf(false) }

    // Зимняя палитра: морозный голубой и глубокий ледяной синий
    val winterIceBlue = Color(0xFF1E3F66)
    val snowBackground = Color(0xFFF0F4F8)

    Column(
        modifier = Modifier
            .fillMaxSize()
            .background(snowBackground)
    ) {
        // Праздничная зимняя шапка
        Box(
            modifier = Modifier
                .fillMaxWidth()
                .background(winterIceBlue)
                .padding(16.dp)
        ) {
            Row(
                modifier = Modifier.fillMaxWidth(),
                horizontalArrangement = Arrangement.SpaceBetween,
                verticalAlignment = Alignment.CenterVertically
            ) {
                Text(
                    text = "❄️ the facebook (Winter '04)",
                    color = Color.White,
                    fontWeight = FontWeight.Bold,
                    fontSize = 20.sp
                )
                Text(
                    text = "Happy New Year!",
                    color = Color(0xFFBCE3C5),
                    fontSize = 12.sp,
                    fontWeight = FontWeight.Medium
                )
            }
        }

        Column(
            modifier = Modifier
                .fillMaxSize()
                .padding(24.dp),
            verticalArrangement = Arrangement.Center,
            horizontalAlignment = Alignment.CenterHorizontally
        ) {
            Card(
                colors = CardDefaults.cardColors(containerColor = Color.White),
                elevation = CardDefaults.cardElevation(3.dp),
                modifier = Modifier.fillMaxWidth()
            ) {
                Column(modifier = Modifier.padding(16.dp)) {
                    Text("Campus Login", fontWeight = FontWeight.Bold, color = winterIceBlue, fontSize = 18.sp)
                    Text("❄️ Snow Edition", fontSize = 11.sp, color = Color.Gray)
                    Spacer(modifier = Modifier.height(16.dp))

                    OutlinedTextField(
                        value = email,
                        onValueChange = { email = it },
                        label = { Text("Email / NetID") },
                        modifier = Modifier.fillMaxWidth(),
                        singleLine = true
                    )
                    Spacer(modifier = Modifier.height(8.dp))

                    OutlinedTextField(
                        value = password,
                        onValueChange = { password = it },
                        label = { Text("Password") },
                        visualTransformation = PasswordVisualTransformation(),
                        modifier = Modifier.fillMaxWidth(),
                        singleLine = true
                    )

                    if (error) {
                        Spacer(modifier = Modifier.height(4.dp))
                        Text("Invalid credentials", color = Color.Red, fontSize = 12.sp)
                    }

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

                    Button(
                        onClick = { if (email.isNotBlank()) onLoginSuccess() else error = true },
                        colors = ButtonDefaults.buttonColors(containerColor = winterIceBlue),
                        modifier = Modifier.fillMaxWidth()
                    ) {
                        Text("Login to Winter")
                    }
                }
            }

            Spacer(modifier = Modifier.height(16.dp))
            TextButton(onClick = onNavigateToRegister) {
                Text("New student? Register here", color = winterIceBlue)
            }
        }
    }
}