129 lines
3.6 KiB
Dart
129 lines
3.6 KiB
Dart
import 'json_util.dart';
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/// 会话列表项（不含消息）
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class ChatSessionItem {
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final int id;
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final String title;
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final String updateTime;
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/// 本会话绑定的人设 id。null = 内置默认人设。
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///
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/// 会话的人设在**新建时确定、之后不可改** —— 一次对话从头到尾是同一个人。
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final int? personaId;
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/// 人设显示名。人设被删了会回落成「默认人设」，历史会话不会因此打不开
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final String personaName;
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/// 人设头像相对路径。null = 用默认头像
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final String? personaAvatar;
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const ChatSessionItem({
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required this.id,
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required this.title,
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required this.updateTime,
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this.personaId,
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this.personaName = '默认人设',
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this.personaAvatar,
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});
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factory ChatSessionItem.fromJson(Map<String, dynamic> json) {
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return ChatSessionItem(
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id: asInt(json['id']),
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title: asNonEmpty(json['title'], '新对话'),
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updateTime: formatDateTime(json['updateTime']),
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personaId: asNullableInt(json['personaId']),
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personaName: asNonEmpty(json['personaName'], '默认人设'),
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personaAvatar: asNonEmpty(json['personaAvatar'], ''),
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);
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}
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}
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/// 会话里的一条消息。工具调用的中间过程后端不入库，所以只有 user / assistant
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class ChatMessageItem {
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final int id;
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final String role;
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final String content;
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const ChatMessageItem({
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required this.id,
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required this.role,
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required this.content,
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});
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bool get isUser => role == 'user';
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factory ChatMessageItem.fromJson(Map<String, dynamic> json) {
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return ChatMessageItem(
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id: asInt(json['id']),
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role: asString(json['role'], fallback: 'assistant'),
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content: asString(json['content']),
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);
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}
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}
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/// 页面上的一个气泡。
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///
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/// 和 [ChatMessageItem] 的区别：这个没有 id、带 streaming 标记，
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/// 因为正在生成的那条回答还没落库。
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class ChatBubble {
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final String role;
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final String content;
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/// 正在生成中（末尾会显示光标 / 工具提示）
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final bool streaming;
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const ChatBubble({
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required this.role,
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required this.content,
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this.streaming = false,
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});
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const ChatBubble.user(String content) : this(role: 'user', content: content);
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const ChatBubble.assistant(String content, {bool streaming = false})
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: this(role: 'assistant', content: content, streaming: streaming);
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bool get isUser => role == 'user';
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ChatBubble copyWith({String? content, bool? streaming}) {
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return ChatBubble(
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role: role,
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content: content ?? this.content,
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streaming: streaming ?? this.streaming,
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);
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}
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factory ChatBubble.fromItem(ChatMessageItem item) =>
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ChatBubble(role: item.role, content: item.content);
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}
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/// SSE 事件类型
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enum AiEventType { delta, tool, done, error }
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/// 一次 SSE 事件。后端只会发这四种，见 AiChatService。
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class AiEvent {
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final AiEventType type;
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/// delta：本次新增的文本
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final String? content;
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/// tool：正在调用的工具名
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final String? toolName;
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/// done：会话 ID（新会话时后端才刚创建，App 要靠它接着聊）
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final int? sessionId;
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/// error：错误提示
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final String? message;
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const AiEvent._(this.type, {this.content, this.toolName, this.sessionId, this.message});
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const AiEvent.delta(String content) : this._(AiEventType.delta, content: content);
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const AiEvent.tool(String name) : this._(AiEventType.tool, toolName: name);
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const AiEvent.done(int? sessionId) : this._(AiEventType.done, sessionId: sessionId);
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const AiEvent.error(String message) : this._(AiEventType.error, message: message);
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}
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