import 'dart:async';
import 'dart:io';

import 'package:flutter/material.dart';
import 'package:path/path.dart' as p;

import 'app/app_controller.dart';
import 'app/download_manager.dart';
import 'app/settings.dart';
import 'core/playlist.dart';
import 'platform/windows/single_instance.dart';
import 'services/platform_services.dart';
import 'ui/ai_dialog.dart';
import 'ui/downloads_page.dart';
import 'ui/home_page.dart';
import 'ui/player_page.dart';
import 'ui/setup_dialog.dart';
import 'ui/update_dialog.dart';
import 'ui/theme.dart';

Future<void> main(List<String> args) async {
  WidgetsFlutterBinding.ensureInitialized();

  // 이미 실행 중이면 인수(탐색기에서 고른 파일)를 넘기고 끝낸다
  final instance = SingleInstance();
  if (!await instance.claim(LaunchRequest.parse(args), waitForExit: args.contains('--restart'))) {
    exit(0);
  }

  final services = PlatformServices.create();
  final controller = AppController(services, settingsStore: SettingsStore());
  await controller.init();

  final downloads = DownloadManager(
    backends: services.createDownloadBackends?.call(() => controller.settings) ?? const [],
    settings: () => controller.settings,
  );
  final navigatorKey = GlobalKey<NavigatorState>();
  final messengerKey = GlobalKey<ScaffoldMessengerState>();

  /// 종료 요청 (창 X · 트레이 종료 · 종료 버튼): 다운로드 중이면 확인
  Future<bool> confirmQuit() async {
    final ctx = navigatorKey.currentContext;
    if (ctx != null && !await confirmExit(ctx, downloads)) return false;
    await downloads.shutdown();
    return true;
  }

  await services.shell.init(
    hotkey: controller.settings.showHotkey,
    minimizeToTray: () => controller.settings.minimizeToTray,
    onCloseRequested: confirmQuit,
    onDownloadsRequested: () => navigatorKey.currentState
        ?.push(MaterialPageRoute<void>(builder: (_) => DownloadsPage(d: downloads))),
  );

  // 클립보드로 추가된 다운로드 알림 · 트레이 글
  downloads.onAdded.listen((t) => messengerKey.currentState
      ?.showSnackBar(SnackBar(content: Text('다운로드 추가: ${t.source}'))));
  downloads.addListener(() {
    final n = downloads.downloadingCount;
    services.shell.setTooltip(n > 0 ? 'JJ_MKVMaker - 다운로드 $n개' : 'JJ_MKVMaker');
  });
  unawaited(downloads.startClipboardWatch());

  // 탐색기 메뉴 · 두 번째 실행에서 온 요청 처리
  instance.listen((req) async {
    await services.shell.show();
    final ctx = navigatorKey.currentContext;
    if (ctx == null || req.files.isEmpty) return;
    if (!ctx.mounted) return;
    switch (req.action) {
      case LaunchAction.play:
        await playFiles(ctx, controller, req.files);
      case LaunchAction.subtitle:
        await controller.addVideos(req.files.where(isVideoFile).toList());
        final targets = controller.videos
            .where((v) => req.files.any((f) => p.equals(f, v.path)))
            .toList();
        if (targets.isNotEmpty && ctx.mounted) {
          controller.select(targets.first);
          await showAiDialog(ctx, controller, targets.first, targets: targets);
        }
      case LaunchAction.add:
        await controller.addVideos(req.files.where(isVideoFile).toList());
    }
  });

  controller.confirmQuit = confirmQuit;

  // 처음 화면이 뜬 뒤: 필수 프로그램 점검 (없으면 물어보고 설치) → 새 버전 확인 (하루 한 번)
  WidgetsBinding.instance.addPostFrameCallback((_) async {
    final ctx = navigatorKey.currentContext;
    if (ctx == null) return;
    await checkRequiredTools(ctx, services.shell);
    final ctx2 = navigatorKey.currentContext;
    if (ctx2 != null && ctx2.mounted) await checkForUpdate(ctx2, controller);
  });

  runApp(JjCapCutApp(
    controller: controller,
    downloads: downloads,
    navigatorKey: navigatorKey,
    messengerKey: messengerKey,
    onExit: () async {
      if (await confirmQuit()) await services.shell.quit();
    },
  ));
}

class JjCapCutApp extends StatelessWidget {
  final AppController controller;
  final DownloadManager? downloads;
  final GlobalKey<NavigatorState>? navigatorKey;
  final GlobalKey<ScaffoldMessengerState>? messengerKey;
  final VoidCallback? onExit;

  const JjCapCutApp({
    super.key,
    required this.controller,
    this.downloads,
    this.navigatorKey,
    this.messengerKey,
    this.onExit,
  });

  @override
  Widget build(BuildContext context) => MaterialApp(
        title: 'JJ_MKVMaker',
        debugShowCheckedModeBanner: false,
        theme: buildTheme(),
        navigatorKey: navigatorKey,
        scaffoldMessengerKey: messengerKey,
        home: HomePage(c: controller, downloads: downloads, onExit: onExit),
      );
}