'use strict';

var async = require('async');
var Quota = require('volos-quota-memory');
var debug = require('debug')('gateway:quota');

module.exports.init = function(config, logger, stats) {
  var quotas = {}; // productName -> connectMiddleware

  var options = {
    key: function(req) { return req.token.application_name; }
  };

  Object.keys(config).forEach(function(productName) {
    var product = config[productName];
    if (!product.uri && !product.key && !product.secret && !product.allow && !product.interval) {
      return; // skip non-quota config
    }

    var quota = Quota.create(config[productName]);
    quotas[productName] = quota.connectMiddleware().apply(options);
    debug('created quota for', productName);
  });

  var middleware = function(req, res, next) {

    if (!req.token || !req.token.api_product_list || !req.token.api_product_list.length) { return next(); }

    debug('quota checking products', req.token.api_product_list);

    req.originalUrl = req.originalUrl || req.url; // emulate connect

    // this is arbitrary, but not sure there's a better way?
    async.eachSeries(req.token.api_product_list,
      function(productName, cb) {
        var connectMiddleware = quotas[productName];
        debug('applying quota for', productName);
        connectMiddleware ? connectMiddleware(req, res, cb) : cb();
      },
      function(err) {
        next(err);
      }
    );
  }

  return {

    testprobe: function() { return quotas },

    onrequest: function(req, res, next) {
      middleware(req, res, next);
    }

  }
};