import 'dart:io';
import 'package:miler/helpers/http_overrides.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:get/get.dart';
import 'package:miler/helpers/app_bootstrap.dart';
import 'package:miler/views/offline/offline_banner.dart';
import 'package:miler/views/helpers/constants/Colorconstants.dart';
import 'package:miler/controllers/profile_controller.dart';
import 'package:miler/controllers/riderlog.dart';
import 'package:miler/controllers/pickup.dart';
import 'package:miler/controllers/logcontroller.dart';
import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:miler/providers/notifications/notificationservce.dart';
import 'package:connectivity_plus/connectivity_plus.dart';
import 'package:new_version_plus/new_version_plus.dart';
import 'package:package_info_plus/package_info_plus.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:miler/background/backgroundservice.dart';
import 'package:miler/helpers/shift_end_alarm.dart';
import 'package:miler/views/helpers/constants/app_theme.dart';
import 'package:miler/views/helpers/widgets/page_transitions.dart';

import 'views/offline/offline_page.dart';

// Background message handler
@pragma('vm:entry-point')
Future<void> firebaseMessagingBackgroundHandler(RemoteMessage message) async {
  await Firebase.initializeApp();
  await NotificationServce.display(message);
}

String currentVersion = '';
String storeVersion = '';
bool updateRequired = false;

Future<void> getAppVersion() async {
  SharedPreferences prefs = await SharedPreferences.getInstance();
  PackageInfo packageInfo = await PackageInfo.fromPlatform();

  String version = packageInfo.version;
  currentVersion = version;
  prefs.setString('CurrentVersion', currentVersion);
  debugPrint('Current version from main: $currentVersion');
}

Future<void> checkForUpdate(BuildContext context) async {
  // Version check is handled in splash screen
}

Future<bool> recheckVersion() async {
  final newVersion = NewVersionPlus(
    iOSId: '284882215',
    androidId: "com.doormile.partner",
  );

  try {
    final status = await newVersion.getVersionStatus();
    if (status != null) {
      debugPrint(
        "Recheck - Current: ${status.localVersion}, Store: ${status.storeVersion}",
      );
      return status.canUpdate;
    }
  } catch (e) {
    debugPrint("Error rechecking version: $e");
  }

  return false;
}

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  HttpOverrides.global = MyHttpOverrides();

  try {
    await Firebase.initializeApp();
    FirebaseMessaging.onBackgroundMessage(firebaseMessagingBackgroundHandler);
  } catch (e) {
    debugPrint('[FIREBASE] Initialization failed: $e');
    // Firebase may not be configured for this platform (e.g. iOS simulator without GoogleService-Info.plist)
  }

  // Loaded at boot, not on first visit to Account: the Home app bar draws the
  // rider's photo, so the controller has to be populated before the first
  // frame or the avatar flashes its letter fallback on every launch.
  await Get.put(ProfileController(), permanent: true).loadFromPrefs();
  Get.put(RiderLogController(), permanent: true);
  Get.put(PickupController(), permanent: true);
  final logController = Get.put(LogController(), permanent: true);

  await logController.startLogging();

  _applySystemChrome();

  runApp(const _RootApp());
}

/// Paints the status and navigation bars to match the page behind them.
void _applySystemChrome() {
  SystemChrome.setSystemUIOverlayStyle(
    const SystemUiOverlayStyle(
      statusBarColor: ColorConstants.surface,
      statusBarIconBrightness: Brightness.dark,
      statusBarBrightness: Brightness.light,
      systemNavigationBarColor: ColorConstants.surface,
      systemNavigationBarIconBrightness: Brightness.dark,
    ),
  );
}

class _RootApp extends StatefulWidget {
  const _RootApp();

  @override
  State<_RootApp> createState() => _RootAppState();
}

class _RootAppState extends State<_RootApp> with WidgetsBindingObserver {
  List<ConnectivityResult> _connectionStatus = [ConnectivityResult.none];

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addObserver(this);

    Connectivity().onConnectivityChanged.listen((result) {
      if (mounted) {
        setState(() {
          _connectionStatus = result;
        });
      }
    });

    Connectivity().checkConnectivity().then((result) {
      if (mounted) {
        setState(() {
          _connectionStatus = result;
        });
      }
    });

    // ✅ Check if shift ended while app was killed OR if shift end time has already passed
    _checkShiftEndOnStartup();

    // Decides banner-vs-blocker only. See [_hasSession].
    _readSessionPresence();
  }

  @override
  void dispose() {
    WidgetsBinding.instance.removeObserver(this);
    super.dispose();
  }

  /// Check if shift ended while app was killed OR if shift end time has already passed
  /// This will trigger break log immediately if rider is on duty and shift end time passed
  Future<void> _checkShiftEndOnStartup() async {
    try {
      final prefs = await SharedPreferences.getInstance();
      final int onduty = prefs.getInt('onduty') ?? 0;

      // Only check if rider was on duty
      if (onduty != 1) {
        debugPrint('[APP_STARTUP] Rider not on duty, skipping shift end check');
        return;
      }

      // Check if shift has ended
      final String endTimeStr = prefs.getString('endtime') ?? '';
      if (endTimeStr.isEmpty) {
        debugPrint('[APP_STARTUP] No endtime found, skipping shift end check');
        return;
      }

      debugPrint(
        '[APP_STARTUP] Checking shift end - Current time: ${DateTime.now()}, End time: $endTimeStr',
      );

      // Use the same logic as BackgroundCollectionLog.checkShiftEnd()
      final now = DateTime.now();
      final endParts = endTimeStr.split(':');
      if (endParts.length < 2) return;

      final int endHour = int.tryParse(endParts[0]) ?? 0;
      final int endMinute = int.tryParse(endParts[1]) ?? 0;
      final int endSecond = endParts.length > 2
          ? (int.tryParse(endParts[2]) ?? 0)
          : 0;

      final DateTime endToday = DateTime(
        now.year,
        now.month,
        now.day,
        endHour,
        endMinute,
        endSecond,
      );

      bool isShiftOver = false;
      final String startTimeStr = prefs.getString('starttime') ?? '';

      if (startTimeStr.isNotEmpty) {
        final startParts = startTimeStr.split(':');
        if (startParts.length >= 2) {
          final int startHour = int.tryParse(startParts[0]) ?? 0;
          final int startMinute = int.tryParse(startParts[1]) ?? 0;

          final double startVal = startHour + (startMinute / 60.0);
          final double endVal = endHour + (endMinute / 60.0);

          if (startVal > endVal) {
            // Overnight shift
            final DateTime startToday = DateTime(
              now.year,
              now.month,
              now.day,
              startHour,
              startMinute,
            );

            if (now.isAfter(endToday) && now.isBefore(startToday)) {
              isShiftOver = true;
            }
          } else {
            // Normal day shift
            if (now.isAfter(endToday)) {
              isShiftOver = true;
            }
          }
        } else {
          if (now.isAfter(endToday)) {
            isShiftOver = true;
          }
        }
      } else {
        if (now.isAfter(endToday)) {
          isShiftOver = true;
        }
      }

      if (isShiftOver) {
        debugPrint(
          '[APP_STARTUP] ⏰ Shift end time ($endTimeStr) has already passed - creating break log IMMEDIATELY...',
        );
        // Call the background service to create break log
        await BackgroundCollectionLog.checkShiftEnd();
        debugPrint('[APP_STARTUP] ✅ Break log created (if needed)');
      } else {
        debugPrint(
          '[APP_STARTUP] Shift end time ($endTimeStr) has not passed yet - scheduling alarm',
        );
        // Also reschedule the alarm in case it was cancelled
        try {
          final String startTime = prefs.getString('starttime') ?? '';
          await ShiftEndAlarm.scheduleAlarm(
            endTime: endTimeStr,
            startTime: startTime,
          );
        } catch (e) {
          debugPrint('[APP_STARTUP] Error rescheduling alarm: $e');
        }
      }
    } catch (e) {
      debugPrint('[APP_STARTUP] Error checking shift end: $e');
    }
  }

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    super.didChangeAppLifecycleState(state);

    if (state == AppLifecycleState.resumed) {
      // When app comes back to foreground, ensure rider logs resume
      try {
        if (Get.isRegistered<RiderLogController>()) {
          final ctl = Get.find<RiderLogController>();
          // Fire an immediate rider log (best-effort)
          ctl.createLoginNowV2();
          // Ensure the periodic background/foreground loop is running
          ctl.startAutoCreateLoginLoop();
        }
      } catch (_) {
        // Ignore lifecycle errors; app should not crash because of logging
      }
    }
  }

  bool get _isOffline {
    return _connectionStatus.isEmpty ||
        _connectionStatus.every((status) => status == ConnectivityResult.none);
  }

  /// Whether there is a signed-in rider whose work is already on the device.
  ///
  /// Read once, purely to choose between two *presentations* of being offline —
  /// it changes no auth behaviour and no routing. [AppBootstrap] still decides
  /// where the app actually goes.
  bool _hasSession = false;

  Future<void> _readSessionPresence() async {
    try {
      final prefs = await SharedPreferences.getInstance();
      final loggedOut = prefs.getBool('logged_out') ?? false;
      final userId = prefs.getInt('userid') ?? prefs.getInt('userId') ?? 0;
      if (mounted) setState(() => _hasSession = !loggedOut && userId != 0);
    } catch (_) {
      // Unknown → treat as no session, which is the more cautious of the two
      // presentations. It only affects which offline UI is shown.
    }
  }

  @override
  Widget build(BuildContext context) {
    // ⭐ RESPONSIVE WRAPPER ADDED
    return ScreenUtilInit(
      designSize: const Size(390, 844), // YOUR BASE SIZE
      minTextAdapt: true,
      splitScreenMode: true,
      builder: (_, __) {
        return GetMaterialApp(
          debugShowCheckedModeBanner: false,
          title: 'Miler partner',
          // Smooth, consistent page motion across the whole app (Uber-style
          // horizontal slide with a gentle ease) instead of abrupt cuts.
          // Screens navigated to by hand use `openScreen`/`openSheet` from
          // views/helpers/widgets/page_transitions.dart; this covers the
          // whole-app swaps (`Get.offAll`) that don't go through them.
          defaultTransition: Transition.cupertino,
          transitionDuration: kMilerPushIn,
          theme: AppTheme.light,
          home: const AppBootstrap(),

          // ── Offline is a strip, not a wall ──
          //
          // This used to stack an opaque [OfflinePage] over the whole app the
          // moment connectivity dropped — so a rider at a doorstep in a
          // basement lost the address, the customer, the parcel count and the
          // OTP field while holding the parcel. Everything he needs at the door
          // was already fetched; the network is required to *report* the stop,
          // not to work it.
          //
          // So a signed-in rider keeps his screen and gets a line of text above
          // it. The full-screen page survives only for a cold start with no
          // session, where there genuinely is nothing to show him.
          builder: (context, child) {
            final baseChild = child ?? const SizedBox.shrink();

            if (_isOffline && !_hasSession) {
              return Stack(children: [baseChild, const OfflinePage()]);
            }

            return OfflineScope(offline: _isOffline, child: baseChild);
          },
        );
      },
    );
  }
}