type SkillId =
  | 'zoom-general'
  | 'zoom-rest-api'
  | 'zoom-webhooks'
  | 'zoom-oauth'
  | 'zoom-meeting-sdk-web-component-view'
  | 'zoom-video-sdk'
  | 'zoom-mcp';

const hasAny = (q: string, words: string[]) => words.some((w) => q.includes(w));

function detectSignals(rawQuery: string) {
  const q = rawQuery.toLowerCase();
  return {
    meetingCustomUi: hasAny(q, ['zoom meeting', 'custom ui', 'component view', 'embed meeting']),
    customVideo: hasAny(q, ['video sdk', 'custom video session', 'peer-video-state-change']),
    restApi: hasAny(q, ['rest api', '/v2/', 'create meeting', 'list users', 's2s oauth']),
    webhooks: hasAny(q, ['webhook', 'x-zm-signature', 'event subscription', 'crc']),
    oauth: hasAny(q, ['oauth', 'pkce', 'token refresh', 'account_credentials']),
    mcp: hasAny(q, ['zoom mcp', 'agentic retrieval', 'tools/list', 'semantic meeting search']),
  };
}

function pickPrimarySkill(s: ReturnType<typeof detectSignals>): SkillId {
  if (s.meetingCustomUi) return 'zoom-meeting-sdk-web-component-view';
  if (s.mcp) return 'zoom-mcp';
  if (s.restApi) return 'zoom-rest-api';
  if (s.customVideo) return 'zoom-video-sdk';
  return 'zoom-general';
}

function buildChain(primary: SkillId, s: ReturnType<typeof detectSignals>): SkillId[] {
  const chain = [primary];
  if (s.oauth && !chain.includes('zoom-oauth')) chain.push('zoom-oauth');
  if (s.webhooks && !chain.includes('zoom-webhooks')) chain.push('zoom-webhooks');
  return chain;
}