import 'package:flutter/foundation.dart';
import 'road_alert_models.dart';

@immutable
class SwarmReport {
  final String id;
  final RoadAlertCategory category;
  final String? subtype;
  final double latitude;
  final double longitude;
  final double? heading;
  final String? roadName;
  final String description;
  final String reporterUid;
  final DateTime reportedAt;
  final DateTime expiresAt;
  final int confirmations;
  final int dismissals;
  final String? groupRideId;
  final String? source;
  final RoadAlertStatus status;

  const SwarmReport({
    required this.id,
    required this.category,
    this.subtype,
    required this.latitude,
    required this.longitude,
    this.heading,
    this.roadName,
    required this.description,
    required this.reporterUid,
    required this.reportedAt,
    required this.expiresAt,
    this.confirmations = 1,
    this.dismissals = 0,
    this.groupRideId,
    this.source,
    this.status = RoadAlertStatus.active,
  });

  double get confidence {
    final total = confirmations + dismissals;
    if (total == 0) return 0.8;
    return (confirmations / total).clamp(0.1, 1.0);
  }

  bool get isExpired => DateTime.now().isAfter(expiresAt);

  bool get isCommunityConfirmed => confirmations >= 2;

  Map<String, dynamic> toJson() => {
        'id': id,
        'category': category.name,
        if (subtype != null) 'subtype': subtype,
        'latitude': latitude,
        'longitude': longitude,
        if (heading != null) 'heading': heading,
        if (roadName != null) 'roadName': roadName,
        'description': description,
        'reporterUid': reporterUid,
        'reportedAt': reportedAt.millisecondsSinceEpoch,
        'expiresAt': expiresAt.millisecondsSinceEpoch,
        'confirmations': confirmations,
        'dismissals': dismissals,
        if (groupRideId != null) 'groupRideId': groupRideId,
        if (source != null) 'source': source,
        'status': status.name,
      };

  factory SwarmReport.fromJson(Map<String, dynamic> json) {
    final catName = json['category']?.toString() ?? 'other';
    final category = RoadAlertCategory.values.firstWhere(
      (c) => c.name == catName,
      orElse: () => RoadAlertCategory.other,
    );

    final rawReportedAt = json['reportedAt'];
    final reportedAt = rawReportedAt is num
        ? DateTime.fromMillisecondsSinceEpoch(rawReportedAt.toInt())
        : (DateTime.tryParse(rawReportedAt?.toString() ?? '') ?? DateTime.now());

    final rawExpiresAt = json['expiresAt'];
    final expiresAt = rawExpiresAt is num
        ? DateTime.fromMillisecondsSinceEpoch(rawExpiresAt.toInt())
        : (DateTime.tryParse(rawExpiresAt?.toString() ?? '') ??
            reportedAt.add(const Duration(hours: 1)));

    final confirmations = (json['confirmations'] as num?)?.toInt() ?? 1;
    final dismissals = (json['dismissals'] as num?)?.toInt() ?? 0;

    final rawStatus = json['status']?.toString();
    final status = RoadAlertStatus.values.firstWhere(
      (s) => s.name == rawStatus,
      orElse: () => confirmations >= 2
          ? RoadAlertStatus.confirmed
          : RoadAlertStatus.active,
    );

    return SwarmReport(
      id: json['id']?.toString() ?? '',
      category: category,
      subtype: json['subtype']?.toString(),
      latitude: (json['latitude'] as num).toDouble(),
      longitude: (json['longitude'] as num).toDouble(),
      heading: json['heading'] != null ? (json['heading'] as num).toDouble() : null,
      roadName: json['roadName']?.toString(),
      description: json['description']?.toString() ?? 'Swarm Report',
      reporterUid: json['reporterUid']?.toString() ?? 'anonymous',
      reportedAt: reportedAt,
      expiresAt: expiresAt,
      confirmations: confirmations,
      dismissals: dismissals,
      groupRideId: json['groupRideId']?.toString(),
      source: json['source']?.toString(),
      status: status,
    );
  }

  RoadAlert toRoadAlert({double? distanceFromUser}) {
    final isHighSeverity = category == RoadAlertCategory.police ||
        category == RoadAlertCategory.accident ||
        category == RoadAlertCategory.weatherHazard;
    final sourceName = source ??
        (groupRideId != null ? 'Pack Rider Report' : 'MotorSignal Swarm');

    return RoadAlert(
      id: id,
      providerId: 'swarm_alerts',
      category: category,
      subtype: subtype,
      latitude: latitude,
      longitude: longitude,
      heading: heading,
      roadName: roadName,
      description: description,
      reportedAt: reportedAt,
      expiresAt: expiresAt,
      lastUpdated: DateTime.now(),
      confidence: confidence,
      severity: isHighSeverity ? RoadAlertSeverity.high : RoadAlertSeverity.medium,
      source: sourceName,
      sourceType: RoadAlertSourceType.userReported,
      status: status,
      confirmations: confirmations,
      dismissals: dismissals,
      reporterUid: reporterUid,
      distanceFromUser: distanceFromUser,
    );
  }

  SwarmReport copyWith({
    String? id,
    RoadAlertCategory? category,
    String? subtype,
    double? latitude,
    double? longitude,
    double? heading,
    String? roadName,
    String? description,
    String? reporterUid,
    DateTime? reportedAt,
    DateTime? expiresAt,
    int? confirmations,
    int? dismissals,
    String? groupRideId,
    String? source,
    RoadAlertStatus? status,
  }) {
    return SwarmReport(
      id: id ?? this.id,
      category: category ?? this.category,
      subtype: subtype ?? this.subtype,
      latitude: latitude ?? this.latitude,
      longitude: longitude ?? this.longitude,
      heading: heading ?? this.heading,
      roadName: roadName ?? this.roadName,
      description: description ?? this.description,
      reporterUid: reporterUid ?? this.reporterUid,
      reportedAt: reportedAt ?? this.reportedAt,
      expiresAt: expiresAt ?? this.expiresAt,
      confirmations: confirmations ?? this.confirmations,
      dismissals: dismissals ?? this.dismissals,
      groupRideId: groupRideId ?? this.groupRideId,
      source: source ?? this.source,
      status: status ?? this.status,
    );
  }
}