package com.example.mycrib

import androidx.compose.animation.AnimatedVisibility
import androidx.compose.foundation.Image
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.safeContentPadding
import androidx.compose.material3.Button
import androidx.compose.material3.CircularProgressIndicator
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Surface
import androidx.compose.material3.Text
import androidx.compose.runtime.*
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import com.example.mycrib.ui.screens.AddResidenceScreen
import com.example.mycrib.ui.screens.EditResidenceScreen
import com.example.mycrib.ui.screens.EditTaskScreen
import com.example.mycrib.ui.screens.ForgotPasswordScreen
import com.example.mycrib.ui.screens.HomeScreen
import com.example.mycrib.ui.screens.LoginScreen
import com.example.mycrib.ui.screens.RegisterScreen
import com.example.mycrib.ui.screens.ResetPasswordScreen
import com.example.mycrib.ui.screens.ResidenceDetailScreen
import com.example.mycrib.ui.screens.ResidencesScreen
import com.example.mycrib.ui.screens.TasksScreen
import com.example.mycrib.ui.screens.VerifyEmailScreen
import com.example.mycrib.ui.screens.VerifyResetCodeScreen
import com.example.mycrib.viewmodel.PasswordResetViewModel
import androidx.lifecycle.viewmodel.compose.viewModel
import org.jetbrains.compose.resources.painterResource
import org.jetbrains.compose.ui.tooling.preview.Preview

import androidx.navigation.compose.NavHost
import androidx.navigation.compose.rememberNavController
import androidx.navigation.compose.composable
import androidx.navigation.toRoute
import com.example.mycrib.ui.screens.MainScreen
import com.example.mycrib.ui.screens.ProfileScreen
import com.example.mycrib.ui.theme.MyCribTheme
import com.example.mycrib.ui.theme.ThemeManager
import com.example.mycrib.navigation.*
import com.example.mycrib.repository.LookupsRepository
import com.example.mycrib.models.Residence
import com.example.mycrib.models.TaskCategory
import com.example.mycrib.models.TaskDetail
import com.example.mycrib.models.TaskFrequency
import com.example.mycrib.models.TaskPriority
import com.example.mycrib.models.TaskStatus
import com.example.mycrib.network.ApiResult
import com.example.mycrib.network.AuthApi
import com.example.mycrib.storage.TokenStorage

import mycrib.composeapp.generated.resources.Res
import mycrib.composeapp.generated.resources.compose_multiplatform

@Composable
@Preview
fun App(
    deepLinkResetToken: String? = null,
    onClearDeepLinkToken: () -> Unit = {}
) {
    var isLoggedIn by remember { mutableStateOf(TokenStorage.hasToken()) }
    var isVerified by remember { mutableStateOf(false) }
    var isCheckingAuth by remember { mutableStateOf(true) }
    val navController = rememberNavController()

    // Check for stored token and verification status on app start
    LaunchedEffect(Unit) {
        val hasToken = TokenStorage.hasToken()
        isLoggedIn = hasToken

        if (hasToken) {
            // Fetch current user to check verification status
            val authApi = AuthApi()
            val token = TokenStorage.getToken()

            if (token != null) {
                when (val result = authApi.getCurrentUser(token)) {
                    is ApiResult.Success -> {
                        isVerified = result.data.verified
                        LookupsRepository.initialize()
                    }
                    else -> {
                        // If fetching user fails, clear token and logout
                        TokenStorage.clearToken()
                        isLoggedIn = false
                    }
                }
            }
        }

        isCheckingAuth = false
    }

    val currentTheme by remember { derivedStateOf { ThemeManager.currentTheme } }

    MyCribTheme(themeColors = currentTheme) {
        if (isCheckingAuth) {
            // Show loading screen while checking auth
            Surface(
                modifier = Modifier.fillMaxSize(),
                color = MaterialTheme.colorScheme.background
            ) {
                Box(
                    modifier = Modifier.fillMaxSize(),
                    contentAlignment = Alignment.Center
                ) {
                    CircularProgressIndicator()
                }
            }
            return@MyCribTheme
        }

        val startDestination = when {
            deepLinkResetToken != null -> ForgotPasswordRoute
            !isLoggedIn -> LoginRoute
            !isVerified -> VerifyEmailRoute
            else -> MainRoute
        }

        Surface(
            modifier = Modifier.fillMaxSize(),
            color = MaterialTheme.colorScheme.background
        ) {
            NavHost(
            navController = navController,
            startDestination = startDestination
        ) {
            composable<LoginRoute> {
                LoginScreen(
                    onLoginSuccess = { user ->
                        isLoggedIn = true
                        isVerified = user.verified
                        // Initialize lookups after successful login
                        LookupsRepository.initialize()

                        // Check if user is verified
                        if (user.verified) {
                            navController.navigate(MainRoute) {
                                popUpTo<LoginRoute> { inclusive = true }
                            }
                        } else {
                            navController.navigate(VerifyEmailRoute) {
                                popUpTo<LoginRoute> { inclusive = true }
                            }
                        }
                    },
                    onNavigateToRegister = {
                        navController.navigate(RegisterRoute)
                    },
                    onNavigateToForgotPassword = {
                        navController.navigate(ForgotPasswordRoute)
                    }
                )
            }

            composable<RegisterRoute> {
                RegisterScreen(
                    onRegisterSuccess = {
                        isLoggedIn = true
                        isVerified = false
                        // Initialize lookups after successful registration
                        LookupsRepository.initialize()
                        navController.navigate(VerifyEmailRoute) {
                            popUpTo<RegisterRoute> { inclusive = true }
                        }
                    },
                    onNavigateBack = {
                        navController.popBackStack()
                    }
                )
            }

            composable<ForgotPasswordRoute> { backStackEntry ->
                // Create shared ViewModel for all password reset screens
                val parentEntry = remember(backStackEntry) {
                    navController.getBackStackEntry<ForgotPasswordRoute>()
                }
                val passwordResetViewModel: PasswordResetViewModel = viewModel(parentEntry) {
                    PasswordResetViewModel(deepLinkToken = deepLinkResetToken)
                }

                ForgotPasswordScreen(
                    onNavigateBack = {
                        // Clear deep link token when navigating back to login
                        onClearDeepLinkToken()
                        navController.popBackStack()
                    },
                    onNavigateToVerify = {
                        navController.navigate(VerifyResetCodeRoute)
                    },
                    onNavigateToReset = {
                        navController.navigate(ResetPasswordRoute)
                    },
                    viewModel = passwordResetViewModel
                )
            }

            composable<VerifyResetCodeRoute> { backStackEntry ->
                // Use shared ViewModel from ForgotPasswordRoute
                val parentEntry = remember(backStackEntry) {
                    navController.getBackStackEntry<ForgotPasswordRoute>()
                }
                val passwordResetViewModel: PasswordResetViewModel = viewModel(parentEntry) { PasswordResetViewModel() }

                VerifyResetCodeScreen(
                    onNavigateBack = {
                        navController.popBackStack()
                    },
                    onNavigateToReset = {
                        navController.navigate(ResetPasswordRoute)
                    },
                    viewModel = passwordResetViewModel
                )
            }

            composable<ResetPasswordRoute> { backStackEntry ->
                // Use shared ViewModel from ForgotPasswordRoute
                val parentEntry = remember(backStackEntry) {
                    navController.getBackStackEntry<ForgotPasswordRoute>()
                }
                val passwordResetViewModel: PasswordResetViewModel = viewModel(parentEntry) { PasswordResetViewModel() }

                ResetPasswordScreen(
                    onPasswordResetSuccess = {
                        // Clear deep link token and navigate back to login after successful password reset
                        onClearDeepLinkToken()
                        navController.navigate(LoginRoute) {
                            popUpTo<ForgotPasswordRoute> { inclusive = true }
                        }
                    },
                    onNavigateBack = {
                        navController.popBackStack()
                    },
                    viewModel = passwordResetViewModel
                )
            }

            composable<VerifyEmailRoute> {
                VerifyEmailScreen(
                    onVerifySuccess = {
                        isVerified = true
                        navController.navigate(MainRoute) {
                            popUpTo<VerifyEmailRoute> { inclusive = true }
                        }
                    },
                    onLogout = {
                        // Clear token and lookups on logout
                        TokenStorage.clearToken()
                        LookupsRepository.clear()
                        isLoggedIn = false
                        isVerified = false
                        navController.navigate(LoginRoute) {
                            popUpTo<VerifyEmailRoute> { inclusive = true }
                        }
                    }
                )
            }

            composable<MainRoute> {
                MainScreen(
                    onLogout = {
                        // Clear token and lookups on logout
                        TokenStorage.clearToken()
                        LookupsRepository.clear()
                        isLoggedIn = false
                        isVerified = false
                        navController.navigate(LoginRoute) {
                            popUpTo<MainRoute> { inclusive = true }
                        }
                    },
                    onResidenceClick = { residenceId ->
                        navController.navigate(ResidenceDetailRoute(residenceId))
                    },
                    onAddResidence = {
                        navController.navigate(AddResidenceRoute)
                    },
                    onAddTask = {
                        // Tasks are added from within a residence
                        // Navigate to first residence or show message if no residences exist
                        // For now, this will be handled by the UI showing "add a property first"
                    },
                    onNavigateToEditResidence = { residence ->
                        navController.navigate(
                            EditResidenceRoute(
                                residenceId = residence.id,
                                name = residence.name,
                                propertyType = residence.propertyTypeId,
                                streetAddress = residence.streetAddress,
                                apartmentUnit = residence.apartmentUnit,
                                city = residence.city,
                                stateProvince = residence.stateProvince,
                                postalCode = residence.postalCode,
                                country = residence.country,
                                bedrooms = residence.bedrooms,
                                bathrooms = residence.bathrooms?.toFloat(),
                                squareFootage = residence.squareFootage,
                                lotSize = residence.lotSize?.toFloat(),
                                yearBuilt = residence.yearBuilt,
                                description = residence.description,
                                isPrimary = residence.isPrimary,
                                ownerUserName = residence.ownerUsername,
                                createdAt = residence.createdAt,
                                updatedAt = residence.updatedAt,
                                owner = residence.ownerId
                            )
                        )
                    },
                    onNavigateToEditTask = { task ->
                        navController.navigate(
                            EditTaskRoute(
                                taskId = task.id,
                                residenceId = task.residenceId,
                                title = task.title,
                                description = task.description,
                                categoryId = task.category?.id ?: 0,
                                categoryName = task.category?.name ?: "",
                                frequencyId = task.frequency?.id ?: 0,
                                frequencyName = task.frequency?.name ?: "",
                                priorityId = task.priority?.id ?: 0,
                                priorityName = task.priority?.name ?: "",
                                statusId = task.status?.id,
                                statusName = task.status?.name,
                                dueDate = task.dueDate,
                                estimatedCost = task.estimatedCost?.toString(),
                                createdAt = task.createdAt,
                                updatedAt = task.updatedAt
                            )
                        )
                    }
                )
            }

            composable<HomeRoute> {
                HomeScreen(
                    onNavigateToResidences = {
                        navController.navigate(MainRoute)
                    },
                    onNavigateToTasks = {
                        navController.navigate(TasksRoute)
                    },
                    onLogout = {
                        // Clear token and lookups on logout
                        TokenStorage.clearToken()
                        LookupsRepository.clear()
                        isLoggedIn = false
                        isVerified = false
                        navController.navigate(LoginRoute) {
                            popUpTo<HomeRoute> { inclusive = true }
                        }
                    }
                )
            }

            composable<ResidencesRoute> { backStackEntry ->
                // Get refresh flag from saved state (set when returning from add/edit)
                val shouldRefresh = backStackEntry.savedStateHandle.get<Boolean>("refresh") ?: false

                ResidencesScreen(
                    onResidenceClick = { residenceId ->
                        navController.navigate(ResidenceDetailRoute(residenceId))
                    },
                    onAddResidence = {
                        navController.navigate(AddResidenceRoute)
                    },
                    onNavigateToProfile = {
                        navController.navigate(ProfileRoute)
                    },
                    shouldRefresh = shouldRefresh,
                    onLogout = {
                        // Clear token and lookups on logout
                        TokenStorage.clearToken()
                        LookupsRepository.clear()
                        isLoggedIn = false
                        isVerified = false
                        navController.navigate(LoginRoute) {
                            popUpTo<HomeRoute> { inclusive = true }
                        }
                    }
                )
            }

            composable<AddResidenceRoute> {
                AddResidenceScreen(
                    onNavigateBack = {
                        navController.popBackStack()
                    },
                    onResidenceCreated = {
                        // Set refresh flag before navigating back
                        navController.previousBackStackEntry?.savedStateHandle?.set("refresh", true)
                        navController.popBackStack()
                    }
                )
            }

            composable<EditResidenceRoute> { backStackEntry ->
                val route = backStackEntry.toRoute<EditResidenceRoute>()
                EditResidenceScreen(
                    residence = Residence(
                        id = route.residenceId,
                        ownerId = route.owner ?: 0,
                        name = route.name,
                        propertyTypeId = route.propertyType,
                        streetAddress = route.streetAddress ?: "",
                        apartmentUnit = route.apartmentUnit ?: "",
                        city = route.city ?: "",
                        stateProvince = route.stateProvince ?: "",
                        postalCode = route.postalCode ?: "",
                        country = route.country ?: "",
                        bedrooms = route.bedrooms,
                        bathrooms = route.bathrooms?.toDouble(),
                        squareFootage = route.squareFootage,
                        lotSize = route.lotSize?.toDouble(),
                        yearBuilt = route.yearBuilt,
                        description = route.description ?: "",
                        purchaseDate = null,
                        purchasePrice = null,
                        isPrimary = route.isPrimary,
                        createdAt = route.createdAt,
                        updatedAt = route.updatedAt
                    ),
                    onNavigateBack = {
                        navController.popBackStack()
                    },
                    onResidenceUpdated = {
                        // Set refresh flag before navigating back
                        navController.previousBackStackEntry?.savedStateHandle?.set("refresh", true)
                        navController.popBackStack()
                    }
                )
            }

            composable<TasksRoute> {
                TasksScreen(
                    onNavigateBack = {
                        navController.popBackStack()
                    }
                )
            }

            composable<ResidenceDetailRoute> { backStackEntry ->
                val route = backStackEntry.toRoute<ResidenceDetailRoute>()
                ResidenceDetailScreen(
                    residenceId = route.residenceId,
                    onNavigateBack = {
                        navController.popBackStack()
                    },
                    onNavigateToEditResidence = { residence ->
                        navController.navigate(
                            EditResidenceRoute(
                                residenceId = residence.id,
                                name = residence.name,
                                propertyType = residence.propertyTypeId,
                                streetAddress = residence.streetAddress,
                                apartmentUnit = residence.apartmentUnit,
                                city = residence.city,
                                stateProvince = residence.stateProvince,
                                postalCode = residence.postalCode,
                                country = residence.country,
                                bedrooms = residence.bedrooms,
                                bathrooms = residence.bathrooms?.toFloat(),
                                squareFootage = residence.squareFootage,
                                lotSize = residence.lotSize?.toFloat(),
                                yearBuilt = residence.yearBuilt,
                                description = residence.description,
                                isPrimary = residence.isPrimary,
                                ownerUserName = residence.ownerUsername,
                                createdAt = residence.createdAt,
                                updatedAt = residence.updatedAt,
                                owner = residence.ownerId
                            )
                        )
                    },
                    onNavigateToEditTask = { task ->
                        navController.navigate(
                            EditTaskRoute(
                                taskId = task.id,
                                residenceId = task.residenceId,
                                title = task.title,
                                description = task.description,
                                categoryId = task.category?.id ?: 0,
                                categoryName = task.category?.name ?: "",
                                frequencyId = task.frequency?.id ?: 0,
                                frequencyName = task.frequency?.name ?: "",
                                priorityId = task.priority?.id ?: 0,
                                priorityName = task.priority?.name ?: "",
                                statusId = task.status?.id,
                                statusName = task.status?.name,
                                dueDate = task.dueDate,
                                estimatedCost = task.estimatedCost?.toString(),
                                createdAt = task.createdAt,
                                updatedAt = task.updatedAt
                            )
                        )
                    }
                )
            }

            composable<EditTaskRoute> { backStackEntry ->
                val route = backStackEntry.toRoute<EditTaskRoute>()
                EditTaskScreen(
                    task = TaskDetail(
                        id = route.taskId,
                        residenceId = route.residenceId,
                        createdById = 0,
                        title = route.title,
                        description = route.description ?: "",
                        category = TaskCategory(id = route.categoryId, name = route.categoryName),
                        frequency = TaskFrequency(
                            id = route.frequencyId,
                            name = route.frequencyName,
                            days = null
                        ),
                        priority = TaskPriority(id = route.priorityId, name = route.priorityName),
                        status = route.statusId?.let {
                            TaskStatus(id = it, name = route.statusName ?: "")
                        },
                        dueDate = route.dueDate,
                        estimatedCost = route.estimatedCost?.toDoubleOrNull(),
                        createdAt = route.createdAt,
                        updatedAt = route.updatedAt,
                        completions = emptyList()
                    ),
                    onNavigateBack = { navController.popBackStack() },
                    onTaskUpdated = { navController.popBackStack() }
                )
            }

            composable<ProfileRoute> {
                ProfileScreen(
                    onNavigateBack = {
                        navController.popBackStack()
                    },
                    onLogout = {
                        // Clear token and lookups on logout
                        TokenStorage.clearToken()
                        LookupsRepository.clear()
                        isLoggedIn = false
                        isVerified = false
                        navController.navigate(LoginRoute) {
                            popUpTo<ProfileRoute> { inclusive = true }
                        }
                    }
                )
            }
        }
        }
    }


    /*
    MaterialTheme {
        var showContent by remember { mutableStateOf(false) }
        Column(
            modifier = Modifier
                .background(MaterialTheme.colorScheme.primaryContainer)
                .safeContentPadding()
                .fillMaxSize(),
            horizontalAlignment = Alignment.CenterHorizontally,
        ) {
            Button(onClick = { showContent = !showContent }) {
                Text("Click me!")
            }
            AnimatedVisibility(showContent) {
                val greeting = remember { Greeting().greet() }
                Column(
                    modifier = Modifier.fillMaxWidth(),
                    horizontalAlignment = Alignment.CenterHorizontally,
                ) {
                    Image(painterResource(Res.drawable.compose_multiplatform), null)
                    Text("Compose: $greeting")
                }
            }
        }
    }
     */
}