//
//  SettingsView.swift
//  SportsTime
//

import SwiftUI

struct SettingsView: View {
    @Environment(\.colorScheme) private var colorScheme
    @Environment(\.modelContext) private var modelContext
    @State private var viewModel = SettingsViewModel()
    @State private var showResetConfirmation = false
    @State private var showPaywall = false
    @State private var showOnboardingPaywall = false
    #if DEBUG
    @State private var selectedSyncStatus: EntitySyncStatus?
    @State private var showSyncLogs = false
    @State private var exporter = DebugShareExporter()
    @State private var showExportProgress = false
    #endif

    var body: some View {
        List {
            // Subscription
            subscriptionSection

            // Appearance Mode (Light/Dark/System)
            appearanceSection

            // Theme Selection
            themeSection

            // Home Screen Animations
            animationsSection

            // Sports Preferences
            sportsSection

            // Travel Preferences
            travelSection

            // Privacy
            privacySection

            // Icon Generator
            iconGeneratorSection

            // About
            aboutSection

            // Reset
            resetSection

            #if DEBUG
            // Debug
            debugSection

            // Sync Status
            syncStatusSection
            #endif
        }
        .scrollContentBackground(.hidden)
        .themedBackground()
        .alert("Reset Settings", isPresented: $showResetConfirmation) {
            Button("Cancel", role: .cancel) { }
            Button("Reset", role: .destructive) {
                viewModel.resetToDefaults()
            }
        } message: {
            Text("This will reset all settings to their default values.")
        }
        .sheet(isPresented: $showOnboardingPaywall) {
            OnboardingPaywallView(isPresented: $showOnboardingPaywall)
        }
    }

    // MARK: - Appearance Section

    private var appearanceSection: some View {
        Section {
            ForEach(AppearanceMode.allCases) { mode in
                Button {
                    withAnimation(.easeInOut(duration: 0.2)) {
                        AppearanceManager.shared.currentMode = mode
                        AnalyticsManager.shared.track(.appearanceChanged(mode: mode.displayName))
                    }
                } label: {
                    HStack(spacing: 12) {
                        // Icon
                        ZStack {
                            Circle()
                                .fill(Theme.warmOrange.opacity(0.15))
                                .frame(width: 32, height: 32)

                            Image(systemName: mode.iconName)
                                .font(.system(size: 16))
                                .foregroundStyle(Theme.warmOrange)
                        }

                        VStack(alignment: .leading, spacing: 2) {
                            Text(mode.displayName)
                                .font(.body)
                                .foregroundStyle(.primary)
                            Text(mode.description)
                                .font(.caption)
                                .foregroundStyle(.secondary)
                        }

                        Spacer()

                        if AppearanceManager.shared.currentMode == mode {
                            Image(systemName: "checkmark.circle.fill")
                                .foregroundStyle(Theme.warmOrange)
                                .font(.title3)
                        }
                    }
                    .contentShape(Rectangle())
                }
                .buttonStyle(.plain)
            }
        } header: {
            Text("Appearance")
        } footer: {
            Text("Choose light, dark, or follow your device settings.")
        }
        .listRowBackground(Theme.cardBackground(colorScheme))
    }

    // MARK: - Theme Section

    private var themeSection: some View {
        Section {
            ForEach(AppTheme.allCases) { theme in
                Button {
                    withAnimation(.easeInOut(duration: 0.2)) {
                        viewModel.selectedTheme = theme
                    }
                } label: {
                    HStack(spacing: 12) {
                        // Color preview circles
                        HStack(spacing: -6) {
                            ForEach(Array(theme.previewColors.enumerated()), id: \.offset) { _, color in
                                Circle()
                                    .fill(color)
                                    .frame(width: 24, height: 24)
                                    .overlay(
                                        Circle()
                                            .stroke(Color.primary.opacity(0.1), lineWidth: 1)
                                    )
                            }
                        }

                        VStack(alignment: .leading, spacing: 2) {
                            Text(theme.displayName)
                                .font(.body)
                                .foregroundStyle(.primary)
                            Text(theme.description)
                                .font(.caption)
                                .foregroundStyle(.secondary)
                        }

                        Spacer()

                        if viewModel.selectedTheme == theme {
                            Image(systemName: "checkmark.circle.fill")
                                .foregroundStyle(Theme.warmOrange)
                                .font(.title3)
                        }
                    }
                    .contentShape(Rectangle())
                }
                .buttonStyle(.plain)
            }
        } header: {
            Text("Theme")
        } footer: {
            Text("Choose a color scheme for the app.")
        }
        .listRowBackground(Theme.cardBackground(colorScheme))
    }

    // MARK: - Animations Section

    private var animationsSection: some View {
        Section {
            Toggle(isOn: Binding(
                get: { DesignStyleManager.shared.animationsEnabled },
                set: {
                    DesignStyleManager.shared.animationsEnabled = $0
                    AnalyticsManager.shared.track(.animationsToggled(enabled: $0))
                }
            )) {
                Label {
                    VStack(alignment: .leading, spacing: 2) {
                        Text("Animated Background")
                            .font(.body)
                            .foregroundStyle(.primary)
                        Text("Show animated sports graphics on home screen")
                            .font(.caption)
                            .foregroundStyle(.secondary)
                    }
                } icon: {
                    Image(systemName: "sparkles")
                        .foregroundStyle(Theme.warmOrange)
                }
            }
        } header: {
            Text("Home Screen")
        }
        .listRowBackground(Theme.cardBackground(colorScheme))
    }

    // MARK: - Sports Section

    private var sportsSection: some View {
        Section {
            ForEach(Sport.supported) { sport in
                Toggle(isOn: Binding(
                    get: { viewModel.selectedSports.contains(sport) },
                    set: { _ in viewModel.toggleSport(sport) }
                )) {
                    Label {
                        Text(sport.displayName)
                    } icon: {
                        Image(systemName: sport.iconName)
                            .foregroundStyle(sportColor(for: sport))
                    }
                }
            }
        } header: {
            Text("Favorite Sports")
        } footer: {
            Text("Selected sports will be shown by default in schedules and trip planning.")
        }
        .listRowBackground(Theme.cardBackground(colorScheme))
    }

    // MARK: - Travel Section

    private var travelSection: some View {
        Section {
            VStack(alignment: .leading, spacing: 8) {
                HStack {
                    Text("Max Driving Per Day")
                    Spacer()
                    Text("\(viewModel.maxDrivingHoursPerDay) hours")
                        .foregroundStyle(.secondary)
                }
                Slider(
                    value: Binding(
                        get: { Double(viewModel.maxDrivingHoursPerDay) },
                        set: { viewModel.maxDrivingHoursPerDay = Int($0) }
                    ),
                    in: 2...12,
                    step: 1
                )
            }

        } header: {
            Text("Travel Preferences")
        } footer: {
            Text("Trips will be optimized to keep daily driving within this limit.")
        }
        .listRowBackground(Theme.cardBackground(colorScheme))
    }

    // MARK: - Privacy Section

    private var privacySection: some View {
        Section {
            Toggle(isOn: Binding(
                get: { !AnalyticsManager.shared.isOptedOut },
                set: { enabled in
                    if enabled {
                        AnalyticsManager.shared.optIn()
                    } else {
                        AnalyticsManager.shared.optOut()
                    }
                }
            )) {
                Label {
                    VStack(alignment: .leading, spacing: 2) {
                        Text("Share Analytics")
                            .font(.body)
                            .foregroundStyle(.primary)
                        Text("Help improve SportsTime by sharing anonymous usage data")
                            .font(.caption)
                            .foregroundStyle(.secondary)
                    }
                } icon: {
                    Image(systemName: "chart.bar.xaxis")
                        .foregroundStyle(Theme.warmOrange)
                }
            }
        } header: {
            Text("Privacy")
        } footer: {
            Text("No personal data is collected. Analytics are fully anonymous.")
        }
        .listRowBackground(Theme.cardBackground(colorScheme))
    }

    // MARK: - About Section

    private var aboutSection: some View {
        Section {
            HStack {
                Text("Version")
                Spacer()
                Text("\(viewModel.appVersion) (\(viewModel.buildNumber))")
                    .foregroundStyle(.secondary)
            }

            Link(destination: URL(string: "https://sportstime.88oakapps.com/privacy.html")!) {
                Label("Privacy Policy", systemImage: "hand.raised")
            }

            Link(destination: URL(string: "https://sportstime.88oakapps.com/eula.html")!) {
                Label("EULA", systemImage: "doc.text")
            }

            Link(destination: URL(string: "mailto:support@88oakapps.com")!) {
                Label("Contact Support", systemImage: "envelope")
            }
        } header: {
            Text("About")
        }
        .listRowBackground(Theme.cardBackground(colorScheme))
    }

    // MARK: - Icon Generator Section

    private var iconGeneratorSection: some View {
        Section {
            NavigationLink {
                SportsIconImageGeneratorView()
                    .navigationTitle("Icon Generator")
                    .navigationBarTitleDisplayMode(.inline)
            } label: {
                Label {
                    VStack(alignment: .leading, spacing: 2) {
                        Text("Sports Icon Generator")
                            .font(.body)
                            .foregroundStyle(.primary)
                        Text("Create shareable icon images")
                            .font(.caption)
                            .foregroundStyle(.secondary)
                    }
                } icon: {
                    Image(systemName: "photo.badge.plus")
                        .foregroundStyle(Theme.warmOrange)
                }
            }
        } header: {
            Text("Creative Tools")
        }
        .listRowBackground(Theme.cardBackground(colorScheme))
    }

    // MARK: - Reset Section

    private var resetSection: some View {
        Section {
            Button(role: .destructive) {
                showResetConfirmation = true
            } label: {
                Label("Reset to Defaults", systemImage: "arrow.counterclockwise")
            }
        }
        .listRowBackground(Theme.cardBackground(colorScheme))
    }

    // MARK: - Debug Section

    #if DEBUG
    private var debugSection: some View {
        Section {
            Toggle(isOn: Binding(
                get: { StoreManager.shared.debugProOverride },
                set: { StoreManager.shared.debugProOverride = $0 }
            )) {
                Label("Override Pro Status", systemImage: "star.fill")
            }

            Button {
                showOnboardingPaywall = true
            } label: {
                Label("Show Onboarding Flow", systemImage: "play.circle")
            }

            Button {
                UserDefaults.standard.removeObject(forKey: "hasSeenOnboardingPaywall")
            } label: {
                Label("Reset Onboarding Flag", systemImage: "arrow.counterclockwise")
            }

            Button {
                showExportProgress = true
                Task {
                    await exporter.exportAll(modelContext: modelContext)
                }
            } label: {
                Label("Export All Shareables", systemImage: "square.and.arrow.up.on.square")
            }

            Button {
                showExportProgress = true
                Task {
                    await exporter.exportAchievementSamples()
                }
            } label: {
                Label("Export Achievement Samples", systemImage: "paintbrush")
            }

            Button {
                showExportProgress = true
                Task {
                    await exporter.exportProgressSamples()
                }
            } label: {
                Label("Export Progress Samples", systemImage: "chart.bar.fill")
            }

            Button {
                showExportProgress = true
                Task {
                    await exporter.exportTripSamples()
                }
            } label: {
                Label("Export Trip Samples", systemImage: "car.fill")
            }

            Button {
                Task { await exporter.addAllStadiumVisits(modelContext: modelContext) }
            } label: {
                Label("Add All Stadium Visits", systemImage: "mappin.and.ellipse")
            }
        } header: {
            Text("Debug")
        } footer: {
            Text("These options are only visible in debug builds.")
        }
        .listRowBackground(Theme.cardBackground(colorScheme))
        .sheet(isPresented: $showExportProgress) {
            DebugExportProgressView(exporter: exporter)
        }
    }

    private var syncStatusSection: some View {
        Section {
            // Check if sync is disabled
            let syncState = SyncState.current(in: modelContext)
            if !syncState.syncEnabled {
                VStack(alignment: .leading, spacing: 8) {
                    HStack {
                        Image(systemName: "pause.circle.fill")
                            .foregroundStyle(.orange)
                        Text("Sync Paused")
                            .font(.headline)
                            .foregroundStyle(.orange)
                    }
                    if let reason = syncState.syncPausedReason {
                        Text(reason)
                            .font(.caption)
                            .foregroundStyle(.secondary)
                    }
                    if let lastError = syncState.lastSyncError {
                        Text("Last error: \(lastError)")
                            .font(.caption)
                            .foregroundStyle(.red)
                    }
                    Text("Consecutive failures: \(syncState.consecutiveFailures)")
                        .font(.caption)
                        .foregroundStyle(.secondary)
                }

                Button {
                    Task {
                        let syncService = CanonicalSyncService()
                        await syncService.resumeSync(context: modelContext)
                        print("[SyncDebug] Sync re-enabled by user")
                    }
                } label: {
                    Label("Re-enable Sync", systemImage: "arrow.clockwise")
                }
                .tint(.blue)
            }

            // Overall status header
            if SyncStatusMonitor.shared.overallSyncInProgress {
                HStack {
                    ProgressView()
                        .scaleEffect(0.8)
                    Text("Sync in progress...")
                        .font(.subheadline)
                        .foregroundStyle(.secondary)
                }
            } else if let lastSync = SyncStatusMonitor.shared.lastFullSyncTime {
                HStack {
                    Image(systemName: SyncStatusMonitor.shared.allSuccessful ? "checkmark.circle.fill" : "exclamationmark.triangle.fill")
                        .foregroundStyle(SyncStatusMonitor.shared.allSuccessful ? .green : .orange)
                    Text("Last sync: \(lastSync.formatted(date: .omitted, time: .shortened))")
                        .font(.subheadline)
                        .foregroundStyle(.secondary)
                    if let duration = SyncStatusMonitor.shared.lastFullSyncDuration {
                        Text("(\(String(format: "%.1fs", duration)))")
                            .font(.caption)
                            .foregroundStyle(.tertiary)
                    }
                }
            }

            // Per-entity status rows
            ForEach(SyncStatusMonitor.shared.orderedStatuses) { status in
                SyncStatusRow(status: status) {
                    selectedSyncStatus = status
                }
            }

            // Manual sync trigger
            Button {
                Task {
                    let syncService = CanonicalSyncService()
                    print("[SyncDebug] Manual sync triggered by user")
                    do {
                        let result = try await syncService.syncAll(context: modelContext)
                        print("[SyncDebug] Manual sync completed: \(result.totalUpdated) records")
                    } catch {
                        print("[SyncDebug] Manual sync failed: \(error)")
                    }
                }
            } label: {
                Label("Trigger Sync Now", systemImage: "arrow.triangle.2.circlepath")
            }

            // View sync logs
            Button {
                showSyncLogs = true
            } label: {
                Label("View Sync Logs", systemImage: "doc.text.magnifyingglass")
            }
        } header: {
            Text("Sync Status")
        } footer: {
            Text("Shows CloudKit sync status for each record type. Updated on app foreground.")
        }
        .listRowBackground(Theme.cardBackground(colorScheme))
        .sheet(item: $selectedSyncStatus) { status in
            SyncStatusDetailSheet(status: status)
        }
        .sheet(isPresented: $showSyncLogs) {
            SyncLogViewerSheet()
        }
    }
    #endif

    // MARK: - Subscription Section

    private var subscriptionSection: some View {
        Section {
            if StoreManager.shared.isPro {
                // Pro user - show manage option
                HStack {
                    Label {
                        VStack(alignment: .leading, spacing: 4) {
                            Text("SportsTime Pro")
                                .foregroundStyle(Theme.textPrimary(colorScheme))
                            Text("Active subscription")
                                .font(.caption)
                                .foregroundStyle(.green)
                        }
                    } icon: {
                        Image(systemName: "star.fill")
                            .foregroundStyle(Theme.warmOrange)
                    }

                    Spacer()

                    Image(systemName: "checkmark.circle.fill")
                        .foregroundStyle(.green)
                }

                Button {
                    if let url = URL(string: "https://apps.apple.com/account/subscriptions") {
                        UIApplication.shared.open(url)
                    }
                } label: {
                    Label("Manage Subscription", systemImage: "gear")
                }
            } else {
                // Free user - show upgrade option
                Button {
                    showPaywall = true
                } label: {
                    HStack {
                        Label {
                            VStack(alignment: .leading, spacing: 4) {
                                Text("Upgrade to Pro")
                                    .foregroundStyle(Theme.textPrimary(colorScheme))
                                Text("Unlimited trips, PDF export, progress tracking")
                                    .font(.caption)
                                    .foregroundStyle(Theme.textSecondary(colorScheme))
                            }
                        } icon: {
                            Image(systemName: "star.fill")
                                .foregroundStyle(Theme.warmOrange)
                        }

                        Spacer()

                        Image(systemName: "chevron.right")
                            .foregroundStyle(Theme.textMuted(colorScheme))
                    }
                }
                .buttonStyle(.plain)

                Button {
                    Task {
                        await StoreManager.shared.restorePurchases(source: "settings")
                    }
                } label: {
                    Label("Restore Purchases", systemImage: "arrow.clockwise")
                }
            }
        } header: {
            Text("Subscription")
        }
        .listRowBackground(Theme.cardBackground(colorScheme))
        .sheet(isPresented: $showPaywall) {
            PaywallView(source: "settings")
        }
    }

    // MARK: - Helpers

    private func sportColor(for sport: Sport) -> Color {
        sport.themeColor
    }
}

#Preview {
    NavigationStack {
        SettingsView()
    }
}

// MARK: - Debug Sync Status Views

#if DEBUG

/// A row showing sync status for a single entity type
struct SyncStatusRow: View {
    let status: EntitySyncStatus
    let onInfoTapped: () -> Void

    var body: some View {
        HStack(spacing: 12) {
            // Status indicator
            Image(systemName: statusIcon)
                .foregroundStyle(statusColor)
                .font(.system(size: 14))
                .frame(width: 20)

            // Entity icon and name
            Image(systemName: status.entityType.iconName)
                .foregroundStyle(.secondary)
                .font(.system(size: 14))
                .frame(width: 20)

            Text(status.entityType.rawValue)
                .font(.body)

            Spacer()

            // Record count (if synced)
            if status.lastSyncTime != nil {
                Text("\(status.recordCount)")
                    .font(.caption)
                    .foregroundStyle(.secondary)
                    .padding(.horizontal, 8)
                    .padding(.vertical, 2)
                    .background(Color.secondary.opacity(0.1))
                    .clipShape(Capsule())
            }

            // Info button
            Button {
                onInfoTapped()
            } label: {
                Image(systemName: "info.circle")
                    .foregroundStyle(.blue)
            }
            .buttonStyle(.plain)
        }
    }

    private var statusIcon: String {
        guard status.lastSyncTime != nil else {
            return "circle.dotted"
        }
        return status.isSuccess ? "checkmark.circle.fill" : "xmark.circle.fill"
    }

    private var statusColor: Color {
        guard status.lastSyncTime != nil else {
            return .secondary
        }
        return status.isSuccess ? .green : .red
    }
}

/// Detail sheet showing full sync information for an entity
struct SyncStatusDetailSheet: View {
    let status: EntitySyncStatus
    @Environment(\.dismiss) private var dismiss

    var body: some View {
        NavigationStack {
            List {
                Section {
                    DetailRow(label: "Entity Type", value: status.entityType.rawValue)
                    DetailRow(label: "Status", value: status.isSuccess ? "Success" : "Failed", valueColor: status.isSuccess ? .green : .red)
                }

                Section {
                    if let syncTime = status.lastSyncTime {
                        DetailRow(label: "Last Sync", value: syncTime.formatted(date: .abbreviated, time: .standard))
                    } else {
                        DetailRow(label: "Last Sync", value: "Never")
                    }

                    DetailRow(label: "Records Synced", value: "\(status.recordCount)")

                    if let duration = status.duration {
                        DetailRow(label: "Duration", value: String(format: "%.2f seconds", duration))
                    }
                }

                if let errorMessage = status.errorMessage {
                    Section("Error") {
                        Text(errorMessage)
                            .font(.caption)
                            .foregroundStyle(.red)
                    }
                }
            }
            .navigationTitle(status.entityType.rawValue)
            .navigationBarTitleDisplayMode(.inline)
            .toolbar {
                ToolbarItem(placement: .topBarTrailing) {
                    Button("Done") {
                        dismiss()
                    }
                }
            }
        }
        .presentationDetents([.medium])
    }
}

/// Helper view for detail rows
private struct DetailRow: View {
    let label: String
    let value: String
    var valueColor: Color = .primary

    var body: some View {
        HStack {
            Text(label)
                .foregroundStyle(.secondary)
            Spacer()
            Text(value)
                .foregroundStyle(valueColor)
        }
    }
}

/// Sheet to view sync logs
struct SyncLogViewerSheet: View {
    @Environment(\.dismiss) private var dismiss
    @State private var logContent = ""
    @State private var autoScroll = true

    var body: some View {
        NavigationStack {
            ScrollViewReader { proxy in
                ScrollView {
                    Text(logContent)
                        .font(.system(.caption, design: .monospaced))
                        .frame(maxWidth: .infinity, alignment: .leading)
                        .padding()
                        .id("logBottom")
                }
                .onChange(of: logContent) {
                    if autoScroll {
                        withAnimation {
                            proxy.scrollTo("logBottom", anchor: .bottom)
                        }
                    }
                }
            }
            .navigationTitle("Sync Logs")
            .navigationBarTitleDisplayMode(.inline)
            .toolbar {
                ToolbarItem(placement: .topBarLeading) {
                    Button("Clear") {
                        SyncLogger.shared.clearLog()
                        logContent = "Log cleared."
                    }
                }
                ToolbarItem(placement: .topBarTrailing) {
                    Button("Done") {
                        dismiss()
                    }
                }
                ToolbarItem(placement: .bottomBar) {
                    HStack {
                        Button {
                            logContent = SyncLogger.shared.readLog()
                        } label: {
                            Label("Refresh", systemImage: "arrow.clockwise")
                        }

                        Spacer()

                        Toggle("Auto-scroll", isOn: $autoScroll)
                            .toggleStyle(.switch)
                            .labelsHidden()
                        Text("Auto-scroll")
                            .font(.caption)
                    }
                }
            }
            .onAppear {
                logContent = SyncLogger.shared.readLog()
            }
        }
    }
}

#endif