import 'package:cloud_firestore/cloud_firestore.dart';

enum DeviationType {
  dailyMax,
  weeklyMax,
  dailyRest,
  weeklyRest,
  averageExceeded,
  nightWork,
}

enum DeviationSeverity {
  warning,
  violation,
}

class DeviationMetadata {
  final double actualValue;
  final double limitValue;
  final String? period;

  DeviationMetadata({
    required this.actualValue,
    required this.limitValue,
    this.period,
  });

  factory DeviationMetadata.fromMap(Map<String, dynamic> map) {
    return DeviationMetadata(
      actualValue: (map['actualValue'] ?? 0).toDouble(),
      limitValue: (map['limitValue'] ?? 0).toDouble(),
      period: map['period'],
    );
  }

  Map<String, dynamic> toMap() {
    return {
      'actualValue': actualValue,
      'limitValue': limitValue,
      'period': period,
    };
  }
}

class Deviation {
  final String id;
  final String userId;
  final String organizationId;
  final String timeRegistrationId;
  final DeviationType type;
  final DeviationSeverity severity;
  final String description;
  final DateTime detectedAt;
  final DateTime? acknowledgedAt;
  final String? acknowledgedBy;
  final DeviationMetadata metadata;

  Deviation({
    required this.id,
    required this.userId,
    required this.organizationId,
    required this.timeRegistrationId,
    required this.type,
    required this.severity,
    required this.description,
    required this.detectedAt,
    this.acknowledgedAt,
    this.acknowledgedBy,
    required this.metadata,
  });

  factory Deviation.fromFirestore(DocumentSnapshot doc) {
    final data = doc.data() as Map<String, dynamic>;
    return Deviation(
      id: doc.id,
      userId: data['userId'] ?? '',
      organizationId: data['organizationId'] ?? '',
      timeRegistrationId: data['timeRegistrationId'] ?? '',
      type: _parseType(data['type']),
      severity: _parseSeverity(data['severity']),
      description: data['description'] ?? '',
      detectedAt: (data['detectedAt'] as Timestamp).toDate(),
      acknowledgedAt: data['acknowledgedAt'] != null
          ? (data['acknowledgedAt'] as Timestamp).toDate()
          : null,
      acknowledgedBy: data['acknowledgedBy'],
      metadata: DeviationMetadata.fromMap(data['metadata'] ?? {}),
    );
  }

  Map<String, dynamic> toFirestore() {
    return {
      'userId': userId,
      'organizationId': organizationId,
      'timeRegistrationId': timeRegistrationId,
      'type': type.name,
      'severity': severity.name,
      'description': description,
      'detectedAt': Timestamp.fromDate(detectedAt),
      'acknowledgedAt':
          acknowledgedAt != null ? Timestamp.fromDate(acknowledgedAt!) : null,
      'acknowledgedBy': acknowledgedBy,
      'metadata': metadata.toMap(),
    };
  }

  static DeviationType _parseType(String? typeString) {
    switch (typeString) {
      case 'dailyMax':
        return DeviationType.dailyMax;
      case 'weeklyMax':
        return DeviationType.weeklyMax;
      case 'dailyRest':
        return DeviationType.dailyRest;
      case 'weeklyRest':
        return DeviationType.weeklyRest;
      case 'averageExceeded':
        return DeviationType.averageExceeded;
      case 'nightWork':
        return DeviationType.nightWork;
      default:
        return DeviationType.dailyMax;
    }
  }

  static DeviationSeverity _parseSeverity(String? severityString) {
    switch (severityString) {
      case 'violation':
        return DeviationSeverity.violation;
      default:
        return DeviationSeverity.warning;
    }
  }

  String get typeDisplayName {
    switch (type) {
      case DeviationType.dailyMax:
        return 'Maks daglig arbeidstid';
      case DeviationType.weeklyMax:
        return 'Maks ukentlig arbeidstid';
      case DeviationType.dailyRest:
        return 'Daglig hviletid';
      case DeviationType.weeklyRest:
        return 'Ukentlig hviletid';
      case DeviationType.averageExceeded:
        return 'Gjennomsnittsberegning overskredet';
      case DeviationType.nightWork:
        return 'Nattarbeid';
    }
  }

  bool get isAcknowledged => acknowledgedAt != null;

  Deviation copyWith({
    String? userId,
    String? organizationId,
    String? timeRegistrationId,
    DeviationType? type,
    DeviationSeverity? severity,
    String? description,
    DateTime? detectedAt,
    DateTime? acknowledgedAt,
    String? acknowledgedBy,
    DeviationMetadata? metadata,
  }) {
    return Deviation(
      id: id,
      userId: userId ?? this.userId,
      organizationId: organizationId ?? this.organizationId,
      timeRegistrationId: timeRegistrationId ?? this.timeRegistrationId,
      type: type ?? this.type,
      severity: severity ?? this.severity,
      description: description ?? this.description,
      detectedAt: detectedAt ?? this.detectedAt,
      acknowledgedAt: acknowledgedAt ?? this.acknowledgedAt,
      acknowledgedBy: acknowledgedBy ?? this.acknowledgedBy,
      metadata: metadata ?? this.metadata,
    );
  }
}