/**
 * controller 入口
 * @author: feng.chen<feng.chen@yoho.cn>
 * @date: 2017/04/13
 */
const Api = require('../common/api');
const _ = require('lodash');
const fs = require('fs');
const blacklist = require('../common/api-blacklist');
const config = global.yoho.config;
const logger = global.yoho.logger;
const apiReg = /^\/Api/;

module.exports = (req, res, next) => {
  const api = new Api();

  api.setContext({
    req,
    res,
  });
  if (!apiReg.test(req.path)) {
    return next({
      code: 404,
    });
  }
  const apiMap = req.path
    .replace(apiReg, '')
    .split('/')
    .filter(n => n)
    .join('.');

  if (_.some(blacklist, n => n.toLowerCase() === apiMap.toLowerCase())) {
    logger.error(`proxy [${req.method}] fail`, `${req.path} can't blacklist`);
    return res.status(401).json({
      code: 401,
      message: '无权限访问的接口',
    });
  }

  const apiUrl = _.get(config.apiDomain, apiMap);

  if (!apiUrl) {
    logger.error(`proxy [${req.method}] fail`, `${req.path} can't find proxy url`);
    return res.status(400).json({
      code: 400,
      message: '无权限访问的接口',
    });
  }
  const currentShop = _.find(req.user.shops, shop => shop.shopsId === _.parseInt(req.cookies._sign));

  if (currentShop) {
    const baseParams = {
      pid: req.user.uid,
      founder: req.user.uid,
      shopsId: currentShop.shopsId,
      shopId: currentShop.shopsId,
      shop: currentShop.shopsId,
      supplierId: currentShop.shopsBrands.length
        ? req.user.supplier_id
          ? req.user.supplier_id
          : _.first(currentShop.shopsBrands).supplierId
        : 0,
      platform_id: config.platform,
      userId: req.user.uid,
    };
    const reqOptions = {
      url: apiUrl,
      method: req.method.toLowerCase(),
      headers: {
        'x-shop-id': currentShop.shopsId,
        'x-user-id': req.user.uid,
        'Content-Type': 'application/json',
      },
    };
    const reqParams = { ...req.query, ...req.body };
    let files = (req.files && req.files.file) || [];

    if (!_.isArray(files)) {
      files = [files];
    }
    if (reqParams.platform_id) {
      delete baseParams.platform_id;
    }

    // filter default params
    if (apiMap.startsWith('erp.franchise')) {
      // 删除专营店的供应商
      delete baseParams.supplierId;
    }
    if (req.method.toLowerCase() === 'get') {
      reqOptions.qs = Object.assign(reqParams, baseParams);
    } else if (files.length) {
      const reqFiles = {};

      _.each(files, file => {
        reqFiles[file.fieldName] = fs.createReadStream(file.path);
      });
      reqOptions.formData = Object.assign(reqParams, baseParams, reqFiles);
    } else {
      reqOptions.body = JSON.stringify(Object.assign(reqParams, baseParams));
    }

    return api
      .proxy(reqOptions)
      .on('error', error => {
        next({ code: 500, message: error });
      })
      .pipe(res);
  }
  return res.status(401).json({
    code: 401,
    message: '无权限访问的店铺',
  });
};