//
//  SportsTimeApp.swift
//  SportsTime
//
//  Created by Trey Tartt on 1/6/26.
//

import SwiftUI
import SwiftData

@main
struct SportsTimeApp: App {
    var sharedModelContainer: ModelContainer = {
        let schema = Schema([
            // User data models
            SavedTrip.self,
            TripVote.self,
            UserPreferences.self,
            CachedSchedule.self,
            // Stadium progress models
            StadiumVisit.self,
            VisitPhotoMetadata.self,
            Achievement.self,
            CachedGameScore.self,
            // Canonical data models
            SyncState.self,
            CanonicalStadium.self,
            StadiumAlias.self,
            CanonicalTeam.self,
            TeamAlias.self,
            LeagueStructureModel.self,
            CanonicalGame.self,
        ])
        let modelConfiguration = ModelConfiguration(
            schema: schema,
            isStoredInMemoryOnly: false,
            cloudKitDatabase: .none  // Local only; CloudKit used separately for schedules
        )

        do {
            return try ModelContainer(for: schema, configurations: [modelConfiguration])
        } catch {
            fatalError("Could not create ModelContainer: \(error)")
        }
    }()

    var body: some Scene {
        WindowGroup {
            BootstrappedContentView(modelContainer: sharedModelContainer)
        }
        .modelContainer(sharedModelContainer)
    }
}

// MARK: - Bootstrapped Content View

/// Wraps the main content with bootstrap logic.
/// Shows a loading indicator until bootstrap completes, then shows HomeView.
struct BootstrappedContentView: View {
    let modelContainer: ModelContainer

    @State private var isBootstrapping = true
    @State private var bootstrapError: Error?

    var body: some View {
        Group {
            if isBootstrapping {
                BootstrapLoadingView()
            } else if let error = bootstrapError {
                BootstrapErrorView(error: error) {
                    Task {
                        await performBootstrap()
                    }
                }
            } else {
                HomeView()
            }
        }
        .task {
            await performBootstrap()
        }
    }

    @MainActor
    private func performBootstrap() async {
        isBootstrapping = true
        bootstrapError = nil

        let context = modelContainer.mainContext
        let bootstrapService = BootstrapService()

        do {
            // 1. Bootstrap from bundled JSON if first launch (no data exists)
            try await bootstrapService.bootstrapIfNeeded(context: context)

            // 2. Configure DataProvider with SwiftData context
            AppDataProvider.shared.configure(with: context)

            // 3. Load data from SwiftData into memory
            await AppDataProvider.shared.loadInitialData()

            // 4. App is now usable
            isBootstrapping = false

            // 5. Background: Try to refresh from CloudKit (non-blocking)
            Task.detached(priority: .background) {
                await self.performBackgroundSync(context: context)
            }
        } catch {
            bootstrapError = error
            isBootstrapping = false
        }
    }

    @MainActor
    private func performBackgroundSync(context: ModelContext) async {
        let syncService = CanonicalSyncService()

        do {
            let result = try await syncService.syncAll(context: context)

            // If any data was updated, reload the DataProvider
            if !result.isEmpty {
                await AppDataProvider.shared.loadInitialData()
                print("CloudKit sync completed: \(result.totalUpdated) items updated")
            }
        } catch CanonicalSyncService.SyncError.cloudKitUnavailable {
            // Offline or CloudKit not available - silently continue with local data
            print("CloudKit unavailable, using local data")
        } catch {
            // Other sync errors - log but don't interrupt user
            print("Background sync error: \(error.localizedDescription)")
        }
    }
}

// MARK: - Bootstrap Loading View

struct BootstrapLoadingView: View {
    var body: some View {
        VStack(spacing: 20) {
            ThemedSpinner(size: 50, lineWidth: 4)

            Text("Setting up SportsTime...")
                .font(.headline)
                .foregroundStyle(.secondary)
        }
    }
}

// MARK: - Bootstrap Error View

struct BootstrapErrorView: View {
    let error: Error
    let onRetry: () -> Void

    var body: some View {
        VStack(spacing: 20) {
            Image(systemName: "exclamationmark.triangle.fill")
                .font(.system(size: 50))
                .foregroundStyle(.orange)

            Text("Setup Failed")
                .font(.title2)
                .fontWeight(.semibold)

            Text(error.localizedDescription)
                .font(.subheadline)
                .foregroundStyle(.secondary)
                .multilineTextAlignment(.center)
                .padding(.horizontal)

            Button("Try Again") {
                onRetry()
            }
            .buttonStyle(.borderedProminent)
        }
        .padding()
    }
}