feat: introduce ChatMessageContent model for enhanced message handling

- Added ChatMessageContent model to encapsulate message content types and action statuses, improving the structure of chat messages.
- Updated ChatMessage model to include a slice of ChatMessageContent, allowing for multiple content items per message.
- Implemented GetContent method to handle content retrieval and formatting based on content type, enhancing message processing capabilities.
- Ensured alignment with existing coding standards and added necessary comments for clarity and maintainability.

core/models/models/chat_message.go

@@ -7,12 +7,52 @@ import (
 type ChatMessage struct {
 	any            `collection:"chat_messages"`
 	BaseModel      `bson:",inline"`
-	ConversationId primitive.ObjectID `json:"conversation_id" bson:"conversation_id" description:"Conversation ID"`
-	Role           string             `json:"role" bson:"role" description:"Message role (user/assistant/system)"`
-	Content        string             `json:"content" bson:"content" description:"Message content"`
-	Tokens         int                `json:"tokens" bson:"tokens" description:"Number of tokens in the message"`
-	Model          string             `json:"model" bson:"model" description:"AI model used"`
-	Metadata       map[string]any     `json:"metadata,omitempty" bson:"metadata,omitempty" description:"Additional metadata"`
-	Status         string             `json:"status" bson:"status" description:"Message status (pending/completed/failed)"`
-	Error          string             `json:"error,omitempty" bson:"error,omitempty" description:"Error message if failed"`
+	ConversationId primitive.ObjectID   `json:"conversation_id" bson:"conversation_id" description:"Conversation ID"`
+	Role           string               `json:"role" bson:"role" description:"Message role (user/assistant/system)"`
+	Content        string               `json:"content,omitempty" bson:"content,omitempty" description:"Message content"`
+	IsAgent        bool                 `json:"is_agent,omitempty" bson:"is_agent,omitempty" description:"Is agent"`
+	ContentIds     []primitive.ObjectID `json:"content_ids,omitempty" bson:"content_ids,omitempty" description:"Content IDs"`
+	Contents       []ChatMessageContent `json:"contents,omitempty" bson:"-" description:"Contents"`
+	Tokens         int                  `json:"tokens" bson:"tokens" description:"Number of tokens in the message"`
+	Model          string               `json:"model" bson:"model" description:"AI model used"`
+	Metadata       map[string]any       `json:"metadata,omitempty" bson:"metadata,omitempty" description:"Additional metadata"`
+	Status         string               `json:"status" bson:"status" description:"Message status (pending/completed/failed)"`
+	Error          string               `json:"error,omitempty" bson:"error,omitempty" description:"Error message if failed"`
+}
+
+func (m *ChatMessage) GetContent() string {
+	// If the message has a single content item, return it directly
+	if m.Content != "" {
+		return m.Content
+	}
+
+	// If the message has multiple content items, concatenate them
+	var result string
+	for _, content := range m.Contents {
+		switch content.Type {
+		case ChatMessageContentTypeText:
+			result += content.Content
+		case ChatMessageContentTypeAction:
+			// Format action content with status
+			actionInfo := "[" + content.Action
+			if content.ActionStatus != "" {
+				actionInfo += " - " + string(content.ActionStatus)
+			}
+			actionInfo += "]"
+
+			if content.Content != "" {
+				result += actionInfo + ": " + content.Content
+			} else {
+				result += actionInfo
+			}
+		default:
+			// For any unrecognized type, just add the content
+			result += content.Content
+		}
+
+		// Add newline between content items
+		result += "\n\n"
+	}
+
+	return result
 }

core/models/models/chat_message_content.go

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2025. Core Digital Limited
+ * 版权所有 (c) 2025. 重庆科锐数研科技有限公司 (Core Digital Limited)
+ * All rights reserved. 保留所有权利。
+ *
+ * 该软件由 重庆科锐数研科技有限公司 (Core Digital Limited) 开发，未经明确书面许可，任何人不得使用、复制、修改或分发该软件的任何部分。
+ * This software is developed by Core Digital Limited. No one is permitted to use, copy, modify, or distribute this software without explicit written permission.
+ *
+ * 许可证：
+ * 该软件仅供授权使用。授权用户有权在授权范围内使用、复制、修改和分发该软件。
+ * License:
+ * This software is for authorized use only. Authorized users are permitted to use, copy, modify, and distribute this software within the scope of their authorization.
+ *
+ * 免责声明：
+ * 该软件按"原样"提供，不附带任何明示或暗示的担保，包括但不限于对适销性和适用于特定目的的担保。在任何情况下，版权持有者或其许可方对因使用该软件而产生的任何损害或其他责任概不负责。
+ * Disclaimer:
+ * This software is provided "as is," without any express or implied warranties, including but not limited to warranties of merchantability and fitness for a particular purpose. In no event shall the copyright holder or its licensors be liable for any damages or other liability arising from the use of this software.
+ */
+
+package models
+
+import "go.mongodb.org/mongo-driver/bson/primitive"
+
+type ChatMessageContentType string
+
+const (
+	ChatMessageContentTypeText   ChatMessageContentType = "text"
+	ChatMessageContentTypeAction ChatMessageContentType = "action"
+)
+
+type ChatMessageContentActionStatus string
+
+const (
+	ChatMessageContentActionStatusPending ChatMessageContentActionStatus = "pending"
+	ChatMessageContentActionStatusSuccess ChatMessageContentActionStatus = "success"
+	ChatMessageContentActionStatusFailed  ChatMessageContentActionStatus = "failed"
+)
+
+type ChatMessageContent struct {
+	any          `collection:"chat_message_contents"`
+	BaseModel    `bson:",inline"`
+	MessageId    primitive.ObjectID             `json:"message_id" bson:"message_id" description:"Message ID"`
+	Content      string                         `json:"content" bson:"content" description:"Message content"`
+	Type         ChatMessageContentType         `json:"type" bson:"type" description:"Message type (text/action)"`
+	Action       string                         `json:"action,omitempty" bson:"action,omitempty" description:"Action name"`
+	ActionStatus ChatMessageContentActionStatus `json:"action_status,omitempty" bson:"action_status,omitempty" description:"Action status"`
+}