update database

lib/features/chat/domain/entities/message.dart

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+/// Domain Entity: Message
+///
+/// Represents a chat message in a conversation.
+library;
+
+/// Content type enum
+enum ContentType {
+  /// Plain text message
+  text,
+
+  /// Image message
+  image,
+
+  /// File attachment
+  file,
+
+  /// Product reference
+  product,
+
+  /// System notification
+  system;
+
+  /// Get display name for content type
+  String get displayName {
+    switch (this) {
+      case ContentType.text:
+        return 'Text';
+      case ContentType.image:
+        return 'Image';
+      case ContentType.file:
+        return 'File';
+      case ContentType.product:
+        return 'Product';
+      case ContentType.system:
+        return 'System';
+    }
+  }
+}
+
+/// Message Entity
+///
+/// Contains information about a chat message:
+/// - Message content
+/// - Sender information
+/// - Attachments
+/// - Read status
+/// - Edit history
+class Message {
+  /// Unique message identifier
+  final String messageId;
+
+  /// Chat room ID this message belongs to
+  final String chatRoomId;
+
+  /// Sender user ID
+  final String senderId;
+
+  /// Content type
+  final ContentType contentType;
+
+  /// Message content/text
+  final String content;
+
+  /// Attachment URL (for images/files)
+  final String? attachmentUrl;
+
+  /// Product reference ID (if product message)
+  final String? productReference;
+
+  /// Message is read
+  final bool isRead;
+
+  /// Message has been edited
+  final bool isEdited;
+
+  /// Message has been deleted
+  final bool isDeleted;
+
+  /// User IDs who have read this message
+  final List<String> readBy;
+
+  /// Message timestamp
+  final DateTime timestamp;
+
+  /// Edit timestamp
+  final DateTime? editedAt;
+
+  const Message({
+    required this.messageId,
+    required this.chatRoomId,
+    required this.senderId,
+    required this.contentType,
+    required this.content,
+    this.attachmentUrl,
+    this.productReference,
+    required this.isRead,
+    required this.isEdited,
+    required this.isDeleted,
+    required this.readBy,
+    required this.timestamp,
+    this.editedAt,
+  });
+
+  /// Check if message is text
+  bool get isText => contentType == ContentType.text;
+
+  /// Check if message is image
+  bool get isImage => contentType == ContentType.image;
+
+  /// Check if message is file
+  bool get isFile => contentType == ContentType.file;
+
+  /// Check if message is product reference
+  bool get isProductReference => contentType == ContentType.product;
+
+  /// Check if message is system notification
+  bool get isSystemMessage => contentType == ContentType.system;
+
+  /// Check if message has attachment
+  bool get hasAttachment =>
+      attachmentUrl != null && attachmentUrl!.isNotEmpty;
+
+  /// Check if message references a product
+  bool get hasProductReference =>
+      productReference != null && productReference!.isNotEmpty;
+
+  /// Get number of readers
+  int get readerCount => readBy.length;
+
+  /// Check if user has read this message
+  bool isReadBy(String userId) {
+    return readBy.contains(userId);
+  }
+
+  /// Check if message is sent by user
+  bool isSentBy(String userId) {
+    return senderId == userId;
+  }
+
+  /// Get time since message was sent
+  Duration get timeSinceSent {
+    return DateTime.now().difference(timestamp);
+  }
+
+  /// Copy with method for immutability
+  Message copyWith({
+    String? messageId,
+    String? chatRoomId,
+    String? senderId,
+    ContentType? contentType,
+    String? content,
+    String? attachmentUrl,
+    String? productReference,
+    bool? isRead,
+    bool? isEdited,
+    bool? isDeleted,
+    List<String>? readBy,
+    DateTime? timestamp,
+    DateTime? editedAt,
+  }) {
+    return Message(
+      messageId: messageId ?? this.messageId,
+      chatRoomId: chatRoomId ?? this.chatRoomId,
+      senderId: senderId ?? this.senderId,
+      contentType: contentType ?? this.contentType,
+      content: content ?? this.content,
+      attachmentUrl: attachmentUrl ?? this.attachmentUrl,
+      productReference: productReference ?? this.productReference,
+      isRead: isRead ?? this.isRead,
+      isEdited: isEdited ?? this.isEdited,
+      isDeleted: isDeleted ?? this.isDeleted,
+      readBy: readBy ?? this.readBy,
+      timestamp: timestamp ?? this.timestamp,
+      editedAt: editedAt ?? this.editedAt,
+    );
+  }
+
+  @override
+  bool operator ==(Object other) {
+    if (identical(this, other)) return true;
+
+    return other is Message &&
+        other.messageId == messageId &&
+        other.chatRoomId == chatRoomId &&
+        other.senderId == senderId &&
+        other.contentType == contentType &&
+        other.content == content &&
+        other.isRead == isRead &&
+        other.isEdited == isEdited &&
+        other.isDeleted == isDeleted;
+  }
+
+  @override
+  int get hashCode {
+    return Object.hash(
+      messageId,
+      chatRoomId,
+      senderId,
+      contentType,
+      content,
+      isRead,
+      isEdited,
+      isDeleted,
+    );
+  }
+
+  @override
+  String toString() {
+    return 'Message(messageId: $messageId, senderId: $senderId, '
+        'contentType: $contentType, isRead: $isRead, timestamp: $timestamp)';
+  }
+}