import 'package:cloud_firestore/cloud_firestore.dart';

enum AuditAction {
  create,
  update,
  delete,
}

enum EntityType {
  timeRegistration,
  user,
  tariffProfile,
}

class AuditLog {
  final String id;
  final String userId;
  final String organizationId;
  final AuditAction action;
  final EntityType entityType;
  final String entityId;
  final Map<String, dynamic>? before;
  final Map<String, dynamic>? after;
  final DateTime timestamp;
  final String? ipAddress;

  AuditLog({
    required this.id,
    required this.userId,
    required this.organizationId,
    required this.action,
    required this.entityType,
    required this.entityId,
    this.before,
    this.after,
    required this.timestamp,
    this.ipAddress,
  });

  factory AuditLog.fromFirestore(DocumentSnapshot doc) {
    final data = doc.data() as Map<String, dynamic>;
    return AuditLog(
      id: doc.id,
      userId: data['userId'] ?? '',
      organizationId: data['organizationId'] ?? '',
      action: _parseAction(data['action']),
      entityType: _parseEntityType(data['entityType']),
      entityId: data['entityId'] ?? '',
      before: data['changes']?['before'],
      after: data['changes']?['after'],
      timestamp: (data['timestamp'] as Timestamp).toDate(),
      ipAddress: data['ipAddress'],
    );
  }

  Map<String, dynamic> toFirestore() {
    return {
      'userId': userId,
      'organizationId': organizationId,
      'action': action.name,
      'entityType': entityType.name,
      'entityId': entityId,
      'changes': {
        'before': before,
        'after': after,
      },
      'timestamp': Timestamp.fromDate(timestamp),
      'ipAddress': ipAddress,
    };
  }

  static AuditAction _parseAction(String? actionString) {
    switch (actionString) {
      case 'update':
        return AuditAction.update;
      case 'delete':
        return AuditAction.delete;
      default:
        return AuditAction.create;
    }
  }

  static EntityType _parseEntityType(String? typeString) {
    switch (typeString) {
      case 'user':
        return EntityType.user;
      case 'tariffProfile':
        return EntityType.tariffProfile;
      default:
        return EntityType.timeRegistration;
    }
  }

  String get actionDisplayName {
    switch (action) {
      case AuditAction.create:
        return 'Opprettet';
      case AuditAction.update:
        return 'Endret';
      case AuditAction.delete:
        return 'Slettet';
    }
  }

  String get entityTypeDisplayName {
    switch (entityType) {
      case EntityType.timeRegistration:
        return 'Timeregistrering';
      case EntityType.user:
        return 'Bruker';
      case EntityType.tariffProfile:
        return 'Tariffprofil';
    }
  }
}