/**
 * 云函数：quicklyVideo（一键成片代理）
 * 替代：
 *   POST /api/quickly/create  → action=create
 *   POST /api/quickly/query   → action=query
 *
 * 把 server.js 里的签名 + relay 逻辑搬到云函数，
 * 隐藏 APP_KEY / APP_SECRET，前端只需传 videoUrls。
 *
 * ⚠️ 不是参考别项目，是本项目 server.js 1820~1914 行的等价实现。
 */
const crypto = require('crypto');

const QUICKLY_APP_KEY = 'ZmNmOGRhNjYzZTAx';
const QUICKLY_APP_SECRET = 'eaa12154c248cad9159a9d6ea8bedf46';
const QUICKLY_ACCOUNT_ID = '12859_117409';
const QUICKLY_CALLBACK_URL = 'https://server.fmode.cn/api/functions/cut/onemerge';
const QUICKLY_RELAY_URL = 'https://server.fmode.cn/api/functions';
// 上游筷子代理云函数 ID（fmode 平台已有）
const UPSTREAM_FN_ID = 'sWvRr8RvPT';

async function handler(request, response) {
  try {
    const action = pickParam(request, 'action');

    if (action === 'create') {
      const videoUrls = pickParam(request, 'videoUrls');
      const options = pickParam(request, 'options') || {};
      if (!Array.isArray(videoUrls) || videoUrls.length === 0) {
        return response.json({ code: 400, success: false, error: '缺少 videoUrls 参数' });
      }

      const timestamp = Date.now().toString();
      const sign = crypto.createHash('md5').update(timestamp + '#' + QUICKLY_APP_SECRET).digest('hex');

      const apiBody = {
        account_id: QUICKLY_ACCOUNT_ID,
        callback_url: QUICKLY_CALLBACK_URL,
        material_list: videoUrls.map(url => ({ type: 'video', value: url })),
        tags: options.tags || '视频,AI生成',
        proportion: options.proportion || '9:16',
        video_duration: options.videoDuration || { min: 10, max: 30 },
        pre_id: timestamp,
        compose_number: 1,
        ai_voice: options.aiVoice ?? 1,
        ai_bgm: options.aiBgm ?? 1,
        ai_flower: 1,
        ai_subtitle: options.aiSubtitle ?? 0,
        original_voice: 0
      };

      const relayBody = {
        action: 'relay',
        relayData: JSON.stringify({
          apiPath: '/v2/video/vlog/create',
          apiBody,
          appKey: QUICKLY_APP_KEY,
          timestamp,
          sign
        })
      };

      console.log(`📦 quicklyVideo.create timestamp=${timestamp} videos=${videoUrls.length}`);

      const r = await fetch(QUICKLY_RELAY_URL, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(relayBody)
      });
      const result = await r.json();
      response.json({ code: 200, success: true, data: result });
      return;
    }

    if (action === 'query') {
      const taskId = pickParam(request, 'taskId');
      if (!taskId) return response.json({ code: 400, success: false, error: '缺少 taskId' });

      const r = await fetch(QUICKLY_RELAY_URL, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          id: UPSTREAM_FN_ID,
          _ApplicationId: 'ncloudmaster',
          action: 'query',
          taskId
        })
      });
      const result = await r.json();
      response.json({ code: 200, success: true, data: result });
      return;
    }

    response.json({ code: 400, success: false, error: `未知 action: ${action}` });
  } catch (error) {
    console.error('❌ quicklyVideo 失败:', error.message);
    response.json({ code: 500, success: false, error: error.message });
  }
}

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;
}