class ChatMessage {
  final int messageId;
  final int taskId;
  final int senderUserId;
  final String senderType; // 'customer' or 'worker'
  final String senderName;
  final String text;
  final DateTime createdOn;
  final bool isRead;

  const ChatMessage({
    required this.messageId,
    required this.taskId,
    required this.senderUserId,
    required this.senderType,
    required this.senderName,
    required this.text,
    required this.createdOn,
    this.isRead = false,
  });

  factory ChatMessage.fromJson(Map<String, dynamic> json) {
    return ChatMessage(
      messageId: (json["MessageID"] as num?)?.toInt() ?? (json["messageId"] as num?)?.toInt() ?? 0,
      taskId: (json["TaskID"] as num?)?.toInt() ?? (json["taskId"] as num?)?.toInt() ?? 0,
      senderUserId: (json["SenderUserID"] as num?)?.toInt() ?? (json["senderUserId"] as num?)?.toInt() ?? 0,
      senderType: json["SenderType"] as String? ?? json["senderType"] as String? ?? "customer",
      senderName: json["SenderName"] as String? ?? json["senderName"] as String? ?? "",
      text: json["Text"] as String? ?? json["MessageText"] as String? ?? json["text"] as String? ?? "",
      createdOn: DateTime.tryParse(
        json["CreatedOn"] as String? ?? json["timestamp"] as String? ?? ""
      ) ?? DateTime.now(),
      isRead: json["IsRead"] == 1 || json["IsRead"] == true || json["isRead"] == true,
    );
  }

  Map<String, dynamic> toJson() {
    return {
      "messageId": messageId,
      "taskId": taskId,
      "senderUserId": senderUserId,
      "senderType": senderType,
      "senderName": senderName,
      "text": text,
      "timestamp": createdOn.toIso8601String(),
      "isRead": isRead,
    };
  }

  /// Check if this message was sent by the current user
  bool isMine(String userType) => senderType == userType;
}