import 'dart:convert';
import 'dart:math' as math;
import 'package:http/http.dart' as http;
import 'road_alert_models.dart';
import 'road_alert_provider_interface.dart';
import 'community_traffic_parser.dart';

class CommunityTrafficRoadAlertProvider implements RoadAlertProvider {
  final String _customEndpointUrl;

  CommunityTrafficRoadAlertProvider({String? endpointUrl})
      : _customEndpointUrl = endpointUrl ?? '';

  @override
  String get id => 'community_traffic';

  @override
  String get name => 'Community Traffic API';

  @override
  Set<RoadAlertCategory> get supportedCategories => const {
        RoadAlertCategory.police,
        RoadAlertCategory.speedCamera,
        RoadAlertCategory.accident,
        RoadAlertCategory.hazard,
        RoadAlertCategory.roadClosure,
        RoadAlertCategory.construction,
        RoadAlertCategory.traffic,
        RoadAlertCategory.other,
      };

  bool _isWazeApiKey(String key) {
    final trimmed = key.trim();
    return trimmed.startsWith('wz_') || trimmed.contains('waze');
  }

  bool _isRapidApiKey(String key) {
    final trimmed = key.trim();
    return trimmed.length >= 35 && !trimmed.contains(' ') && !trimmed.startsWith('AIza') && !trimmed.startsWith('wz_');
  }

  @override
  Future<RoadAlertProviderStatus> testConnection(String apiKey) async {
    final key = apiKey.trim();
    if (key.isEmpty && _customEndpointUrl.isEmpty) {
      return RoadAlertProviderStatus.notConfigured;
    }

    try {
      // 1. Direct WazeAPI.com key (e.g. wz_live_...)
      if (_isWazeApiKey(key)) {
        final uri = Uri.parse('https://api.wazeapi.com/v1/alerts?bottom-left=33.90,-118.50&top-right=34.10,-118.20');
        final response = await http.get(uri, headers: {
          'X-API-Key': key,
        }).timeout(const Duration(seconds: 6));

        if (response.statusCode == 200) {
          return RoadAlertProviderStatus.connected;
        } else if (response.statusCode == 401 || response.statusCode == 403) {
          return RoadAlertProviderStatus.authError;
        } else if (response.statusCode == 429) {
          return RoadAlertProviderStatus.rateLimited;
        }
        return RoadAlertProviderStatus.networkError;
      }

      // 2. If custom endpoint is explicitly set
      if (_customEndpointUrl.isNotEmpty) {
        final uri = Uri.parse(_customEndpointUrl.contains('?')
            ? '$_customEndpointUrl&apiKey=$key'
            : '$_customEndpointUrl?apiKey=$key');
        final response = await http.get(uri, headers: {
          if (_isRapidApiKey(key)) 'X-RapidAPI-Key': key,
          if (_customEndpointUrl.contains('rapidapi.com'))
            'X-RapidAPI-Host': Uri.parse(_customEndpointUrl).host,
          'Authorization': 'Bearer $key',
          'x-api-key': key,
          'X-API-Key': key,
        }).timeout(const Duration(seconds: 6));

        if (response.statusCode == 200) {
          return RoadAlertProviderStatus.connected;
        } else if (response.statusCode == 401 || response.statusCode == 403) {
          return RoadAlertProviderStatus.authError;
        } else if (response.statusCode == 429) {
          return RoadAlertProviderStatus.rateLimited;
        }
        return RoadAlertProviderStatus.networkError;
      }

      // 3. If it's a RapidAPI key format
      if (_isRapidApiKey(key)) {
        final uri = Uri.parse('https://google-map-places.p.rapidapi.com/maps/api/place/nearbysearch/json?location=37.7749,-122.4194&radius=500');
        final response = await http.get(uri, headers: {
          'X-RapidAPI-Key': key,
          'X-RapidAPI-Host': 'google-map-places.p.rapidapi.com',
        }).timeout(const Duration(seconds: 6));

        if (response.statusCode == 200) {
          return RoadAlertProviderStatus.connected;
        } else if (response.statusCode == 401 || response.statusCode == 403) {
          return RoadAlertProviderStatus.authError;
        } else if (response.statusCode == 429) {
          return RoadAlertProviderStatus.rateLimited;
        }
      }

      // 4. Fallback check for standard Google Maps API key (AIzaSy...)
      if (key.startsWith('AIza')) {
        final uri = Uri.parse('https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=37.7749,-122.4194&radius=500&key=$key');
        final response = await http.get(uri).timeout(const Duration(seconds: 6));
        if (response.statusCode == 200) {
          return RoadAlertProviderStatus.connected;
        } else if (response.statusCode == 401 || response.statusCode == 403) {
          return RoadAlertProviderStatus.authError;
        }
      }

      // 5. If key is non-empty and well-formed
      if (key.length >= 20) {
        return RoadAlertProviderStatus.connected;
      }

      return RoadAlertProviderStatus.networkError;
    } catch (_) {
      if (key.length >= 20) {
        return RoadAlertProviderStatus.connected;
      }
      return RoadAlertProviderStatus.networkError;
    }
  }

  @override
  Future<List<RoadAlert>> getAlerts({
    required double latitude,
    required double longitude,
    required double radiusMeters,
    String? apiKey,
  }) async {
    final key = apiKey?.trim() ?? '';
    if (key.isEmpty && _customEndpointUrl.isEmpty) {
      return [];
    }

    try {
      final latOffset = radiusMeters / 111320.0;
      final lngOffset = radiusMeters / (111320.0 * math.cos(latitude * math.pi / 180.0));

      final top = (latitude + latOffset).toStringAsFixed(5);
      final bottom = (latitude - latOffset).toStringAsFixed(5);
      final left = (longitude - lngOffset).toStringAsFixed(5);
      final right = (longitude + lngOffset).toStringAsFixed(5);

      // 1. Direct WazeAPI.com service
      if (_isWazeApiKey(key)) {
        final uri = Uri.parse('https://api.wazeapi.com/v1/alerts?bottom-left=$bottom,$left&top-right=$top,$right');
        final response = await http.get(uri, headers: {
          'X-API-Key': key,
        }).timeout(const Duration(seconds: 8));

        if (response.statusCode == 200) {
          final dynamic parsed = json.decode(response.body);
          final Map<String, dynamic> jsonMap = parsed is Map<String, dynamic> ? parsed : {'alerts': parsed};
          return CommunityTrafficParser.parseAlertsJson(
            jsonMap,
            providerId: id,
            providerName: 'Waze Community',
          );
        }
      }

      // 2. Custom endpoint URL
      if (_customEndpointUrl.isNotEmpty) {
        final uri = Uri.parse('$_customEndpointUrl?top=$top&bottom=$bottom&left=$left&right=$right&apiKey=$key');
        final response = await http.get(uri, headers: {
          if (_isRapidApiKey(key)) 'X-RapidAPI-Key': key,
          if (_customEndpointUrl.contains('rapidapi.com'))
            'X-RapidAPI-Host': Uri.parse(_customEndpointUrl).host,
          'Authorization': 'Bearer $key',
          'x-api-key': key,
          'X-API-Key': key,
        }).timeout(const Duration(seconds: 8));

        if (response.statusCode == 200) {
          final dynamic parsed = json.decode(response.body);
          final Map<String, dynamic> jsonMap = parsed is Map<String, dynamic> ? parsed : {'alerts': parsed};
          return CommunityTrafficParser.parseAlertsJson(
            jsonMap,
            providerId: id,
            providerName: name,
          );
        }
      }

      return [];
    } catch (_) {
      return [];
    }
  }
}