import type { TeacherRequest } from '../../shared/coding-teacher';
import { parseTeacherReply } from '../../shared/teacher-reply';

const MAX_CURRENT_QUICK_REPLIES = 3;

export function teacherReplyInstructions(): string {
  return `本轮界面接收一个 JSON 对象 {"reply":string,"quickReplies":string[]}。reply 是回复正文，可使用 Markdown；quickReplies 是可选的快捷回复，最多 ${MAX_CURRENT_QUICK_REPLIES} 条，每条为非空字符串，没有快捷回复时用空数组。只使用这两个字段。字符串中的英文双引号、反斜杠和换行必须按 JSON 规则转义，确保整个对象是合法 JSON。回复的内容、语言、风格、长度和前缀遵循当前智能体的云端配置。`;
}

/** The original response remains available for diagnosis when parsing is incomplete. */
export function applyTeacherReply(request: TeacherRequest, raw: string): void {
  const parsed = parseTeacherReply(raw);
  // Apply the current UI contract only to new replies; archived replies keep
  // their original cards through the compatibility parser and topic store.
  if (parsed.quickReplies.length > MAX_CURRENT_QUICK_REPLIES) {
    request.replyQuickRepliesRejected = true;
    parsed.quickReplies = [];
    parsed.parseError ??= '快捷回复超过当前界面最多 3 条的限制，正文已保留，快捷回复未展示。';
  } else delete request.replyQuickRepliesRejected;
  request.response = parsed.reply;
  request.suggestedQuestions = parsed.quickReplies;
  if (parsed.incomplete) request.replyIncomplete = true;
  else delete request.replyIncomplete;
  if (parsed.parseError) {
    request.replyParseError = parsed.parseError;
  } else {
    delete request.replyParseError;
    delete request.discussionError;
  }
  if (parsed.parseError || parsed.recovered) request.unparsedResponse = raw;
  else delete request.unparsedResponse;
}