import 'package:flutter/material.dart';
import 'package:flutter_localizations/flutter_localizations.dart';

import 'nav.dart';
import 'screens/call_screen.dart';
import 'screens/home_screen.dart';
import 'screens/login_screen.dart';
import 'services/call_service.dart';
import 'services/im_service.dart';
import 'theme.dart';

void main() {
  WidgetsFlutterBinding.ensureInitialized();
  runApp(const ChanglianApp());
}

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

  @override
  State<ChanglianApp> createState() => _ChanglianAppState();
}

class _ChanglianAppState extends State<ChanglianApp> {
  @override
  void initState() {
    super.initState();
    // 被踢下线 / token 失效：清凭证、回登录页
    IMService.instance.onForceLogout = () async {
      await LoginScreen.clearCredential();
      navigatorKey.currentState?.pushAndRemoveUntil(
        MaterialPageRoute(builder: (_) => const LoginScreen()),
        (route) => false,
      );
    };
    // 来电时弹出通话界面
    CallService.instance.onIncomingCall = () {
      navigatorKey.currentState?.push(
        MaterialPageRoute(builder: (_) => const CallScreen(), fullscreenDialog: true),
      );
    };
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: '畅联',
      navigatorKey: navigatorKey,
      theme: buildAppTheme(),
      debugShowCheckedModeBanner: false,
      localizationsDelegates: const [
        GlobalMaterialLocalizations.delegate,
        GlobalWidgetsLocalizations.delegate,
        GlobalCupertinoLocalizations.delegate,
      ],
      supportedLocales: const [Locale('zh', 'CN')],
      locale: const Locale('zh', 'CN'),
      home: const SplashGate(),
    );
  }
}

/// 启动页：初始化 SDK，有本地凭证则自动登录进主页，否则进登录页
class SplashGate extends StatefulWidget {
  const SplashGate({super.key});

  @override
  State<SplashGate> createState() => _SplashGateState();
}

class _SplashGateState extends State<SplashGate> {
  @override
  void initState() {
    super.initState();
    _boot();
  }

  Future<void> _boot() async {
    final im = IMService.instance;
    // 先读本地凭证：没有凭证（首次打开）直接去登录页，
    // 不在启动页等 SDK 初始化——服务器连不上时 initSDK 可能长时间不返回，
    // 不能让启动页一直转圈。
    final credential = await LoginScreen.readCredential();
    if (credential == null) {
      if (!mounted) return;
      Navigator.of(context).pushReplacement(MaterialPageRoute(builder: (_) => const LoginScreen()));
      return;
    }
    try {
      await im.init().timeout(const Duration(seconds: 20));
      await im.login(userID: credential.$1, token: credential.$2).timeout(const Duration(seconds: 20));
      CallService.instance.start();
      if (!mounted) return;
      Navigator.of(context).pushReplacement(MaterialPageRoute(builder: (_) => const HomeScreen()));
      return;
    } catch (_) {
      // 自动登录失败（token 失效、服务器连不上等）：清凭证回登录页
      await LoginScreen.clearCredential();
    }
    if (!mounted) return;
    Navigator.of(context).pushReplacement(MaterialPageRoute(builder: (_) => const LoginScreen()));
  }

  @override
  Widget build(BuildContext context) {
    return const Scaffold(
      body: Center(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            Text('畅联', style: TextStyle(fontSize: 32, fontWeight: FontWeight.w600, color: AppColors.primary)),
            SizedBox(height: AppGap.x6),
            SizedBox(width: 28, height: 28, child: CircularProgressIndicator(strokeWidth: 3, color: AppColors.primary)),
          ],
        ),
      ),
    );
  }
}