// Chanora Flutter application — External Beta build.
//
// Builds on Internal Beta v0.3.0-beta.1:
//   * server password field
//   * bookmark list with add / connect / delete actions
//   * channel tap-to-join with optional channel password
//   * self input + output mute toggles + master output gain slider
//   * diagnostics dialog + reconnect banner + identity persistence
//     (all carried over from v0.3.0-beta.1)

import 'dart:async';
import 'dart:io' show Platform;

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

import 'l10n/generated/app_localizations.dart';
import 'services/app_bootstrap.dart';
import 'services/audio_lifecycle_service.dart';
import 'services/ui_preferences_service.dart';
import 'screens/home_screen.dart';
import 'src/rust/api.dart' as rust;
import 'src/rust/frb_generated.dart';
import 'widgets/audio_debug_stats_panel.dart';

bool get isMacOS => !kIsWeb && Platform.isMacOS;
// Debug-only overlay. `kDebugMode` is a compile-time const in
// release builds (= false), so the overlay subtree is tree-shaken
// out of release/profile binaries entirely — release users never
// see internal audio stats and we don't pay the render cost.
bool get _showAudioDebugOverlay => kDebugMode && isMacOS;

const Color _appSurfaceColor = Color(0xFFFFFBFE);

/// Top padding for macOS to clear traffic-light buttons.
const double macOSTrafficLightPad = 56.0;

/// Public version string shown in the About dialog.
String kAppVersion = appSemverBaseline;

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await RustLib.init();
  unawaited(() async {
    await wireStorage();
    await wireCache();
  }());
  unawaited(wireConnectivity());
  wireAudioLifecycle();
  await configureBundledVadModels();
  runApp(const ChanoraApp());
  unawaited(_finishDeferredStartup());
}

Future<void> _finishDeferredStartup() async {
  try {
    kAppVersion = await resolveAppVersion();
  } catch (_) {}
}

class ChanoraApp extends StatefulWidget {
  const ChanoraApp({super.key});

  @override
  State<ChanoraApp> createState() => _ChanoraAppState();
}

class _ChanoraAppState extends State<ChanoraApp> {
  final UiPreferencesService _uiPreferences = const UiPreferencesService();
  ThemeMode _themeMode = ThemeMode.system;

  @override
  void initState() {
    super.initState();
    unawaited(_loadThemeMode());
  }

  Future<void> _loadThemeMode() async {
    try {
      final settings = await _uiPreferences.loadSettings();
      if (!mounted) return;
      setState(() {
        _themeMode = settings.themeMode.toFlutterThemeMode();
      });
    } catch (_) {}
  }

  @override
  Widget build(BuildContext context) {
    return AnnotatedRegion<SystemUiOverlayStyle>(
      value: const SystemUiOverlayStyle(
        statusBarColor: Colors.transparent,
        statusBarIconBrightness: Brightness.dark,
        systemNavigationBarColor: _appSurfaceColor,
        systemNavigationBarDividerColor: _appSurfaceColor,
        systemNavigationBarIconBrightness: Brightness.dark,
      ),
      child: MaterialApp(
        onGenerateTitle: (ctx) => AppL10n.of(ctx).appTitle,
        debugShowCheckedModeBanner: false,
        theme: ThemeData(
          useMaterial3: true,
          colorSchemeSeed: const Color(0xFF3F51B5),
          scaffoldBackgroundColor: _appSurfaceColor,
        ),
        darkTheme: ThemeData(
          useMaterial3: true,
          colorSchemeSeed: const Color(0xFF3F51B5),
          brightness: Brightness.dark,
        ),
        themeMode: _themeMode,
        localizationsDelegates: AppL10n.localizationsDelegates,
        supportedLocales: AppL10n.supportedLocales,
        home: Stack(
          children: [
            BetaHome(themeMode: _themeMode, onThemeModeChanged: _setThemeMode),
            if (_showAudioDebugOverlay) const AudioDebugStatsPanel(),
          ],
        ),
      ),
    );
  }

  Future<void> _setThemeMode(ThemeMode themeMode) async {
    setState(() {
      _themeMode = themeMode;
    });
    try {
      await _uiPreferences.saveThemeMode(themeMode.toUiThemeMode());
    } catch (_) {}
  }
}

extension on UiThemeMode {
  ThemeMode toFlutterThemeMode() {
    return switch (this) {
      UiThemeMode.system => ThemeMode.system,
      UiThemeMode.light => ThemeMode.light,
      UiThemeMode.dark => ThemeMode.dark,
    };
  }
}

extension on ThemeMode {
  UiThemeMode toUiThemeMode() {
    return switch (this) {
      ThemeMode.system => UiThemeMode.system,
      ThemeMode.light => UiThemeMode.light,
      ThemeMode.dark => UiThemeMode.dark,
    };
  }
}

bool isPokeSenderActiveChat({
  required bool chatOpen,
  required rust.BridgeMessageTarget? inlineChatTarget,
  required BigInt senderId,
}) {
  if (!chatOpen) return false;
  return switch (inlineChatTarget) {
    rust.BridgeMessageTarget_Poke(:final field0) ||
    rust.BridgeMessageTarget_Client(:final field0) => field0 == senderId,
    _ => false,
  };
}

class ChanoraThemeModeMenu extends StatelessWidget {
  const ChanoraThemeModeMenu({
    super.key,
    required this.themeMode,
    required this.onThemeModeChanged,
  });

  final ThemeMode themeMode;
  final Future<void> Function(ThemeMode mode) onThemeModeChanged;

  @override
  Widget build(BuildContext context) {
    return PopupMenuButton<ThemeMode>(
      tooltip: 'Theme',
      icon: const Icon(Icons.palette_outlined),
      initialValue: themeMode,
      onSelected: (mode) {
        unawaited(onThemeModeChanged(mode));
      },
      itemBuilder: (context) => const [
        PopupMenuItem(value: ThemeMode.system, child: Text('System')),
        PopupMenuItem(value: ThemeMode.light, child: Text('Light')),
        PopupMenuItem(value: ThemeMode.dark, child: Text('Dark')),
      ],
    );
  }
}

class ChanoraMobileScaffold extends StatelessWidget {
  const ChanoraMobileScaffold({
    super.key,
    required this.compactIdleChrome,
    required this.canDisconnect,
    required this.title,
    required this.actions,
    required this.onDisconnect,
    required this.compactHeader,
    required this.body,
    this.disconnectTooltip = 'Disconnect',
  });

  final bool compactIdleChrome;
  final bool canDisconnect;
  final Widget? title;
  final List<Widget> actions;
  final VoidCallback onDisconnect;
  final Widget compactHeader;
  final Widget body;
  final String disconnectTooltip;

  @override
  Widget build(BuildContext context) {
    final paddedBody = SafeArea(
      top: compactIdleChrome,
      child: Padding(
        padding: const EdgeInsets.all(16),
        child: compactIdleChrome
            ? Column(
                crossAxisAlignment: CrossAxisAlignment.stretch,
                children: [
                  compactHeader,
                  const SizedBox(height: 8),
                  Expanded(child: body),
                ],
              )
            : body,
      ),
    );

    return Scaffold(
      appBar: compactIdleChrome
          ? null
          : AppBar(
              leading: canDisconnect
                  ? IconButton(
                      tooltip: disconnectTooltip,
                      icon: const Icon(Icons.arrow_back),
                      onPressed: onDisconnect,
                    )
                  : null,
              leadingWidth: canDisconnect ? 44 : null,
              titleSpacing: canDisconnect ? 4 : null,
              title: title,
              actions: actions,
            ),
      body: paddedBody,
    );
  }
}