import SwiftUI
import SwiftData

// MARK: - ContentView

/// Root navigation container for the CelestiaTrace app.
/// Uses a TabView with three tabs: Home, Field Records, and Settings.
struct ContentView: View {
    @Environment(\.modelContext) private var modelContext
    @Environment(\.scenePhase) private var scenePhase
    @Query(sort: \CelestiaSession.startTime, order: .reverse) private var sessions: [CelestiaSession]
    @ObservedObject private var authManager = AuthManager.shared
    @AppStorage(DeveloperLogStore.enabledKey) private var isDeveloperModeEnabled = false

    /// Currently selected tab.
    @State private var selectedTab: Tab = .home
    /// Session selected for detail playback navigation in Field Records tab.
    @State private var fieldRecordsSelectedSession: CelestiaSession?

    var body: some View {
        ZStack(alignment: .bottomTrailing) {
            TabView(selection: $selectedTab) {
                HomeView { session in
                    fieldRecordsSelectedSession = session
                    selectedTab = .fieldRecords
                }
                .tabItem {
                    Label(Tab.home.title, systemImage: Tab.home.icon)
                }
                .tag(Tab.home)

                SessionListView(
                    selectedSession: $fieldRecordsSelectedSession,
                    onStartRecording: {
                        selectedTab = .home
                    }
                )
                .tabItem {
                    Label(Tab.fieldRecords.title, systemImage: Tab.fieldRecords.icon)
                }
                .tag(Tab.fieldRecords)

                SettingsView()
                .tabItem {
                    Label(Tab.settings.title, systemImage: Tab.settings.icon)
                }
                .tag(Tab.settings)
            }
            .tint(.celestiaCyan)

            if isDeveloperModeEnabled {
                DeveloperLogOverlay()
                    .transition(.scale(scale: 0.92, anchor: .bottomTrailing).combined(with: .opacity))
                    .zIndex(20)
            }
        }
        .animation(.easeInOut(duration: 0.2), value: isDeveloperModeEnabled)
        .onAppear {
            if isDeveloperModeEnabled {
                DeveloperLogStore.log("App", "开发者模式已启用，开始记录本次运行日志", level: .success)
            }
            if RecordingRecoveryStore.activeSessionID != nil
                || RecordingLiveActivityManager.shared.recoverableSessionID != nil {
                selectedTab = .home
            }
        }
        .task(id: authManager.currentUser?.id) {
            await synchronizeFieldRecords()
        }
        .onChange(of: scenePhase) { _, newPhase in
            guard newPhase == .active else { return }
            Task {
                await synchronizeFieldRecords()
            }
        }
        .onOpenURL { url in
            guard RecordingLiveActivityRoute(url: url) != nil else { return }
            selectedTab = .home
        }
        .onChange(of: isDeveloperModeEnabled) { _, enabled in
            if enabled {
                DeveloperLogStore.log("App", "开发者模式已开启", level: .success)
            }
        }
    }

    @MainActor
    private func synchronizeFieldRecords() async {
        guard let userID = authManager.currentUser?.id else { return }
        _ = await SyncManager.shared.sync(
            sessions: sessions,
            modelContext: modelContext,
            userID: userID
        )
    }
}

// MARK: - Tab Definition

extension ContentView {
    /// Defines the available tabs in the app's root navigation.
    enum Tab: Hashable {
        case home
        case fieldRecords
        case settings

        var title: String {
            switch self {
            case .home: "首页"
            case .fieldRecords: "现场记录"
            case .settings: "设置"
            }
        }

        var icon: String {
            switch self {
            case .home: "house.fill"
            case .fieldRecords: "waveform.path.ecg"
            case .settings: "gearshape.fill"
            }
        }
    }
}

// MARK: - Preview

#Preview {
    ContentView()
        .modelContainer(for: CelestiaSession.self, inMemory: true)
}