/**
 * 云函数：douyinManager
 * 代理抖音/TikHub 相关接口，避免前端暴露 TikHub 地址和 token。
 *
 * 部署后把函数 objectId 填入 src/app/services/cloud-functions.ts 的 douyin。
 */
const TIKHUB_BASE_URL = 'https://api.tikhub.io';
const TIKHUB_TOKEN = 'gqsZHfMWgAiMwV+ITbmZy0qALADWBZVS7QnV7kKJe9CwzgWgJG+7bwK+GQ==';

const ROUTES = {
  searchVideos: { method: 'POST', path: '/api/v1/douyin/search/fetch_general_search_v2' },
  challengeSearch: { method: 'POST', path: '/api/v1/douyin/search/fetch_challenge_search_v2' },
  videoDetail: { method: 'GET', path: '/api/v1/douyin/app/v3/fetch_one_video_v3' },
  userProfileWeb: { method: 'GET', path: '/api/v1/douyin/web/handler_user_profile_v2' },
  userProfileApp: { method: 'GET', path: '/api/v1/douyin/app/v3/handler_user_profile' },
  userPosts: { method: 'GET', path: '/api/v1/douyin/web/fetch_user_post_videos' },
  comments: { method: 'GET', path: '/api/v1/douyin/app/v3/fetch_video_comments' },
  replies: { method: 'POST', path: '/api/v1/douyin/comment/reply/list' },
};

async function handler(request, response) {
  try {
    const action = pickParam(request, 'action') || 'call';
    if (action !== 'call') {
      return response.json({ code: 400, success: false, error: `未知 action: ${action}` });
    }

    const routeName = String(pickParam(request, 'route') || '').trim();
    const route = ROUTES[routeName];
    if (!route) {
      return response.json({ code: 400, success: false, error: '不支持的抖音接口' });
    }

    const params = pickParam(request, 'params') || {};
    const body = pickParam(request, 'payload', 'data') || {};
    const data = route.method === 'GET'
      ? await requestJson('GET', route.path, params)
      : await requestJson('POST', route.path, body);

    response.json(data);
  } catch (error) {
    console.error('douyinManager failed:', error && error.message ? error.message : error);
    response.json({ code: 500, success: false, error: error && error.message ? error.message : '抖音服务调用失败' });
  }
}

async function requestJson(method, path, payload) {
  const url = new URL(`${TIKHUB_BASE_URL}${path}`);
  const init = {
    method,
    headers: {
      'Content-Type': 'application/json',
      'Accept': 'application/json',
      'Authorization': `Bearer ${TIKHUB_TOKEN}`,
    },
  };

  if (method === 'GET') {
    for (const [key, value] of Object.entries(payload || {})) {
      if (value !== undefined && value !== null && value !== '') {
        url.searchParams.set(key, String(value));
      }
    }
  } else {
    init.body = JSON.stringify(stripEmpty(payload || {}));
  }

  const r = await fetch(url.toString(), init);
  const text = await r.text();
  let data = null;
  try { data = text ? JSON.parse(text) : null; } catch {}
  if (!r.ok) {
    return { code: r.status, success: false, error: readError(data, text) || `HTTP ${r.status}` };
  }
  return data || { code: 500, success: false, error: '服务返回异常' };
}

function pickParam(request, ...names) {
  const sources = [request.params, request.body, request];
  for (const src of sources) {
    if (!src || typeof src !== 'object') continue;
    for (const n of names) {
      const v = src[n];
      if (v !== undefined && v !== null && v !== '') return v;
    }
  }
  return null;
}

function stripEmpty(value) {
  if (!value || typeof value !== 'object') return value;
  const out = Array.isArray(value) ? [] : {};
  for (const [key, val] of Object.entries(value)) {
    if (val === undefined || val === null || val === '') continue;
    if (val && typeof val === 'object' && !Array.isArray(val)) {
      const nested = stripEmpty(val);
      if (Object.keys(nested).length) out[key] = nested;
    } else {
      out[key] = val;
    }
  }
  return out;
}

function readError(data, fallback) {
  return data?.error?.message || data?.error || data?.message || data?.msg || fallback || '';
}