import { stripKnownChatSkillPrompt } from './chat-skills.mjs';

/**
 * Strip agent-only prefixes from persisted user messages for UI display.
 * Regression guard — see docs/regression-guards/mindspace-publish-and-chat-finish.md
 */

export const TASK_ROUTING_HINT_RE = /^【TKMind 路由提示】[\s\S]*?\n\n/;
export const MEMIND_TASK_ORCHESTRATION_RE = /^【Memind 任务编排】[\s\S]*?(?:用户任务：|用户任务:)\s*/u;
export const MINDSPACE_CONTEXT_RE = /^\[MindSpace 上下文\][\s\S]*?\n\n/;
const USER_IDENTITY_BLOCK_RE = /^\[用户身份\][\s\S]*?\n\n/;

export function stripUserIdentityPrefix(text) {
  return String(text ?? '').replace(USER_IDENTITY_BLOCK_RE, '').trimStart();
}

export function stripTaskRoutingHint(text) {
  return String(text ?? '').replace(TASK_ROUTING_HINT_RE, '').trimStart();
}

export function stripMemindTaskOrchestrationPrefix(text) {
  return String(text ?? '').replace(MEMIND_TASK_ORCHESTRATION_RE, '').trimStart();
}

export function stripMindSpaceContextPrefix(text) {
  let next = String(text ?? '');
  while (MINDSPACE_CONTEXT_RE.test(next)) {
    next = next.replace(MINDSPACE_CONTEXT_RE, '').trimStart();
  }
  return next;
}

const ASSISTANT_DELIVERABLE_RE =
  /\[[^\]]+\]\(https?:\/\/[^)]+\)|https?:\/\/(?:m\.)?[^/\s]*tkmind\.(?:cn|ai)\/MindSpace\//i;

const INTERNAL_ASSISTANT_MARKERS = [
  /data-mindspace-page-tag/i,
  /mindspace-cover/i,
  /\bload_skill\b/i,
  /static-page-publish/i,
  /\.agents\/skills/i,
  /SKILL\.md/i,
  /注意到技能/u,
  /技能更新/u,
  /页脚要用.*platform-brand/u,
];

/** Agent-only process narration that should not appear in the chat UI. */
export function isInternalAssistantProcessNarration(text) {
  const trimmed = String(text ?? '').trim();
  if (!trimmed) return false;
  if (ASSISTANT_DELIVERABLE_RE.test(trimmed)) return false;
  return INTERNAL_ASSISTANT_MARKERS.some((pattern) => pattern.test(trimmed));
}

export function deriveAssistantFacingText(text) {
  const trimmed = String(text ?? '').trim();
  if (!trimmed) return '';
  if (isInternalAssistantProcessNarration(trimmed)) return '';
  return trimmed;
}

/** Strip agent-only prefixes from persisted user message content for UI display. */
export function deriveUserFacingText(text) {
  let next = String(text ?? '');
  next = stripUserIdentityPrefix(next);
  next = stripTaskRoutingHint(next);
  next = stripMemindTaskOrchestrationPrefix(next);
  next = stripMindSpaceContextPrefix(next);
  next = stripKnownChatSkillPrompt(next);
  return next.trim();
}