import 'package:flutter/foundation.dart';
import 'package:supplements/logging.dart';

import '../services/database_sync_service.dart';
import '../services/auto_sync_service.dart';
import 'settings_provider.dart';

class SimpleSyncProvider with ChangeNotifier {
  final DatabaseSyncService _syncService = DatabaseSyncService();
  
  // Callback for UI refresh after sync
  VoidCallback? _onSyncCompleteCallback;
  
  // Auto-sync service
  AutoSyncService? _autoSyncService;
  
  // Track if current sync is auto-triggered
  bool _isAutoSync = false;
  
  // Getters
  SyncStatus get status => _syncService.status;
  String? get lastError => _syncService.lastError;
  DateTime? get lastSyncTime => _syncService.lastSyncTime;
  bool get isConfigured => _syncService.isConfigured;
  bool get isSyncing => status == SyncStatus.downloading || 
                        status == SyncStatus.merging || 
                        status == SyncStatus.uploading;
  bool get isAutoSync => _isAutoSync;
  AutoSyncService? get autoSyncService => _autoSyncService;
  
  // Auto-sync error handling getters
  bool get isAutoSyncDisabledDueToErrors => _autoSyncService?.isAutoDisabledDueToErrors ?? false;
  int get autoSyncConsecutiveFailures => _autoSyncService?.consecutiveFailures ?? 0;
  String? get autoSyncLastError => _autoSyncService?.lastErrorMessage;
  bool get hasAutoSyncScheduledRetry => _autoSyncService?.hasScheduledRetry ?? false;
  
  // Configuration getters
  String? get serverUrl => _syncService.serverUrl;
  String? get username => _syncService.username;
  String? get password => _syncService.password;
  String? get remotePath => _syncService.remotePath;

  SimpleSyncProvider() {
    // Set up callbacks to notify listeners
    _syncService.onStatusChanged = (_) => notifyListeners();
    _syncService.onError = (_) => notifyListeners();
    _syncService.onSyncCompleted = () {
      notifyListeners();
      // Trigger UI refresh callback if set
      _onSyncCompleteCallback?.call();
    };
    
    // Load saved configuration and notify listeners when done
    _loadConfiguration();
  }

  /// Set callback to refresh UI data after sync completes
  void setOnSyncCompleteCallback(VoidCallback? callback) {
    _onSyncCompleteCallback = callback;
  }

  /// Initialize auto-sync service with settings provider
  void initializeAutoSync(SettingsProvider settingsProvider) {
    _autoSyncService = AutoSyncService(
      syncProvider: this,
      settingsProvider: settingsProvider,
    );
    
    if (kDebugMode) {
      printLog('SimpleSyncProvider: Auto-sync service initialized');
    }
  }

  /// Triggers auto-sync if enabled and configured
  void triggerAutoSyncIfEnabled() {
    _autoSyncService?.triggerAutoSync();
  }

  Future<void> _loadConfiguration() async {
    await _syncService.loadSavedConfiguration();
    notifyListeners(); // Notify UI that configuration might be available
  }

  Future<void> configure({
    required String serverUrl,
    required String username,
    required String password,
    required String remotePath,
  }) async {
    _syncService.configure(
      serverUrl: serverUrl,
      username: username,
      password: password,
      remotePath: remotePath,
    );
    notifyListeners();
  }

  Future<bool> testConnection() async {
    return await _syncService.testConnection();
  }

  Future<void> syncDatabase({bool isAutoSync = false}) async {
    if (!isConfigured) {
      throw Exception('Sync not configured');
    }
    
    _isAutoSync = isAutoSync;
    notifyListeners();
    
    try {
      await _syncService.syncDatabase();
    } catch (e) {
      if (kDebugMode) {
        printLog('Sync failed in provider: $e');
      }
      rethrow;
    } finally {
      _isAutoSync = false;
      notifyListeners();
    }
  }

  void clearError() {
    _syncService.clearError();
    notifyListeners();
  }

  /// Resets auto-sync error state and re-enables auto-sync if it was disabled
  void resetAutoSyncErrors() {
    _autoSyncService?.resetErrorState();
    notifyListeners();
  }

  String getStatusText() {
    final syncType = _isAutoSync ? 'Auto-sync' : 'Sync';
    
    // Check for auto-sync specific errors first
    if (isAutoSyncDisabledDueToErrors) {
      return 'Auto-sync disabled due to repeated failures. ${autoSyncLastError ?? 'Check sync settings.'}';
    }
    
    switch (status) {
      case SyncStatus.idle:
        if (hasAutoSyncScheduledRetry) {
          return 'Auto-sync will retry shortly...';
        }
        return 'Ready to sync';
      case SyncStatus.downloading:
        return '$syncType: Downloading remote database...';
      case SyncStatus.merging:
        return '$syncType: Merging databases...';
      case SyncStatus.uploading:
        return '$syncType: Uploading database...';
      case SyncStatus.completed:
        return '$syncType completed successfully';
      case SyncStatus.error:
        // For auto-sync errors, show more specific messages
        if (_isAutoSync && autoSyncLastError != null) {
          return 'Auto-sync failed: $autoSyncLastError';
        }
        return '$syncType failed: ${lastError ?? 'Unknown error'}';
    }
  }

  @override
  void dispose() {
    _autoSyncService?.dispose();
    super.dispose();
  }
}