/** Guards for WeChat “做成页面” follow-ups that must bind to in-session content. */

const PAGE_SOURCE_REFERENCE_PATTERN =
  /(?:这个|刚才|上面|前面|上一条|它|这首|这篇|这段|以下内容|以上内容|刚才生成|上面生成)/iu;

const PAGE_TEMPLATE_MEMORY_PATTERN =
  /(?:做成页面|新闻页|新闻页面|固定格式|daily[- ]?news|国际国内热门新闻)/iu;

const ORCHESTRATION_PREFIX_PATTERN =
  /^【Memind 任务编排】[\s\S]*?用户任务：\s*/u;

const MIN_SUBSTANTIVE_ASSISTANT_CHARS = 48;

export function hasExplicitPageSourceReference(text) {
  return PAGE_SOURCE_REFERENCE_PATTERN.test(String(text ?? '').trim());
}

export function isBareImmediatePageCreateRequest(text) {
  const normalized = String(text ?? '').trim();
  if (!normalized) return false;
  if (!/(?:吧|呀|呢|一下)[。.!！\s]*$/u.test(normalized)) return false;
  return (
    /^(?:(?:请|麻烦|可以|能不能)\s*)?(?:(?:帮我|帮忙|给我)\s*)?(?:做|弄|改|转|写|排版|生成|制作)(?:成|为)?\s*(?:一个|个)?\s*(?:页面|网页)/iu.test(
      normalized,
    )
    && !hasExplicitPageSourceReference(normalized)
  );
}

export function stripOrchestrationFromAssistantText(text) {
  return String(text ?? '')
    .replace(ORCHESTRATION_PREFIX_PATTERN, '')
    .trim();
}

export function extractSubstantiveAssistantText(text) {
  const normalized = stripOrchestrationFromAssistantText(text);
  if (normalized.length < MIN_SUBSTANTIVE_ASSISTANT_CHARS) return '';
  if (/^(?:好的|收到|我先|让我|ok|let me)\b/iu.test(normalized) && normalized.length < 120) {
    return '';
  }
  return normalized;
}

export function filterMemoryForImmediatePageContext(memories) {
  if (!Array.isArray(memories) || memories.length === 0) return memories;
  return memories.filter((entry) => {
    const label = String(entry?.label ?? entry?.type ?? '').trim().toLowerCase();
    const body = String(entry?.text ?? entry?.content ?? entry?.body ?? '').trim();
    if (label === 'preference' && PAGE_TEMPLATE_MEMORY_PATTERN.test(body)) return false;
    return true;
  });
}

export function resolveWechatPageContinuationSource({
  userText = '',
  carriedSessionContent = '',
  sessionAssistantContent = '',
} = {}) {
  const carried = extractSubstantiveAssistantText(carriedSessionContent);
  if (carried) {
    return { ok: true, sourceText: carried, source: 'carried_session' };
  }
  const inSession = extractSubstantiveAssistantText(sessionAssistantContent);
  if (inSession) {
    return { ok: true, sourceText: inSession, source: 'session_assistant' };
  }
  const normalized = String(userText ?? '').trim();
  if (hasExplicitPageSourceReference(normalized) && normalized.length >= MIN_SUBSTANTIVE_ASSISTANT_CHARS) {
    return { ok: true, sourceText: normalized, source: 'inline_user' };
  }
  return { ok: false, sourceText: '', source: 'missing' };
}

export function shouldFailFastWechatPageContinuation({
  sessionPageContinuation = false,
  userText = '',
  carriedSessionContent = '',
  sessionAssistantContent = '',
} = {}) {
  if (!sessionPageContinuation) return false;
  if (!isBareImmediatePageCreateRequest(userText) && hasExplicitPageSourceReference(userText)) {
    return !resolveWechatPageContinuationSource({
      userText,
      carriedSessionContent,
      sessionAssistantContent,
    }).ok;
  }
  if (!isBareImmediatePageCreateRequest(userText)) return false;
  return !resolveWechatPageContinuationSource({
    userText,
    carriedSessionContent,
    sessionAssistantContent,
  }).ok;
}

export const WECHAT_PAGE_CONTINUATION_MISSING_SOURCE_TEXT =
  '我没能确定您要把哪段内容做成页面。请一条消息发完整主题，或直接粘贴要做成页面的正文（例如诗词、文章全文）。';

export function isWechatPageContinuationRepairableError(message) {
  const normalized = String(message ?? '').trim();
  if (!normalized) return false;
  return (
    /stale_session_poisoned_completion/i.test(normalized)
    || /wechat_page_fresh_thumbnail_required:/i.test(normalized)
    || /wechat_agent_incomplete_reply/i.test(normalized)
    || /missing_page_artifact/i.test(normalized)
    || /poisoned_or_fake_claim/i.test(normalized)
    || /skill_or_stub/i.test(normalized)
  );
}

export function extractLastSubstantiveAssistantFromConversation(messages = []) {
  for (let index = messages.length - 1; index >= 0; index -= 1) {
    const message = messages[index];
    if (message?.role !== 'assistant') continue;
    const text = extractSubstantiveAssistantText(
      Array.isArray(message?.content)
        ? message.content
            .filter((item) => item?.type === 'text' && typeof item.text === 'string')
            .map((item) => item.text)
            .join('')
        : String(message?.text ?? ''),
    );
    if (text) return text;
  }
  return '';
}