kev/Drawer/AI/Models/ChatMessageModel.cs

using System.ComponentModel;
using LiveMarkdown.Avalonia;
using AI.Models.SpecialMessages;

namespace AI.Models
{
    public enum AuthorType
    {
        User,
        AI,
        Tool, // 用于显示工具调用记录
    }

    public enum MessageType
    {
        Text,
        File,
        WorkflowStatus, // 工作流状态消息
        Form,           // 表单消息
        Table,          // 表格数据预览（如导入数据预览）
        ColumnMatch,    // 必需列与预览列匹配展示
        ParameterSet,   // 参数集展示（名称/值/描述）
        KnowledgeBase,      // 知识库查询结果（已写入 Store，供 LLM 与 UI 使用）
        XyzLoadCard,        // 散点文件加载综合卡片（打开文件+数据预览+列头匹配）
        GriddingParamCard,  // 网格化参数设置综合卡片（参数加载+编辑+成图按钮）
        // 未来可扩展：Code, Image, Chart 等
    }

    public class ChatMessageModel(AuthorType authorType, string message, bool lastMessage = false) : INotifyPropertyChanged
    {
        public AuthorType Author { get; set; } = authorType;
        public MessageType Type { get; set; } = MessageType.Text;
        
        private ObservableStringBuilder _markdownBuilder = InitializeMarkdownBuilder(message);
        public ObservableStringBuilder MarkdownBuilder
        {
            get => _markdownBuilder;
            set
            {
                if (_markdownBuilder != value)
                {
                    _markdownBuilder = value;
                    OnPropertyChanged(nameof(MarkdownBuilder));
                }
            }
        }

        private string _message = message;
        public string Message
        {
            get => _message;
            set
            {
                if (_message != value)
                {
                    _message = value;
                    if (_markdownBuilder != null)
                    {
                        _markdownBuilder.Clear();
                        _markdownBuilder.Append(value);
                    }
                    OnPropertyChanged(nameof(Message));
                }
            }
        }

        public string FileName { get; set; } = string.Empty;
        public string FilePath { get; set; } = string.Empty;
        public long FileSize { get; set; }

        /// <summary>
        /// 特殊消息内容（用于扩展消息类型）
        /// </summary>
        public ISpecialMessage? SpecialContent { get; set; }

        private bool _lastMessage = lastMessage;
        public bool LastMessage
        {
            get => _lastMessage;
            set
            {
                if (_lastMessage != value)
                {
                    _lastMessage = value;
                    OnPropertyChanged(nameof(LastMessage));
                }
            }
        }

        public event PropertyChangedEventHandler? PropertyChanged;
        protected void OnPropertyChanged(string propertyName)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }

        private static ObservableStringBuilder InitializeMarkdownBuilder(string message)
        {
            var builder = new ObservableStringBuilder();
            if (!string.IsNullOrEmpty(message))
            {
                builder.Append(message);
            }
            return builder;
        }
    }
}