'use strict';

var _ = require('lodash');
var async = require('async');

var chai = require('chai');
var sinon = require('sinon');
var should = chai.should();
var log = require('npmlog');
log.debug = log.verbose;
log.level = 'info';

var helpers = require('./helpers');

var FiatRateService = require('../../lib/fiatrateservice');

describe('Fiat rate service', function() {
  var service, request;

  before(function(done) {
    helpers.before(done);
  });
  after(function(done) {
    helpers.after(done);
  });
  beforeEach(function(done) {
    helpers.beforeEach(function() {
      service = new FiatRateService();
      request = sinon.stub();
      request.get = sinon.stub();
      service.init({
        storage: helpers.getStorage(),
        request: request,
      }, function(err) {
        should.not.exist(err);
        service.startCron({}, done);
      });
    });
  });
  describe('#getRate', function() {
    it('should get current rate', function(done) {
      service.storage.storeFiatRate('BitPay', [{
        code: 'USD',
        value: 123.45,
      }], function(err) {
        should.not.exist(err);
        service.getRate({
          code: 'USD'
        }, function(err, res) {
          should.not.exist(err);
          res.rate.should.equal(123.45);
          done();
        });
      });
    });
    it('should get current rate for different currency', function(done) {
      service.storage.storeFiatRate('BitPay', [{
        code: 'USD',
        value: 123.45,
      }], function(err) {
        should.not.exist(err);
        service.storage.storeFiatRate('BitPay', [{
          code: 'EUR',
          value: 345.67,
        }], function(err) {
          should.not.exist(err);
          service.getRate({
            code: 'EUR'
          }, function(err, res) {
            should.not.exist(err);
            res.rate.should.equal(345.67);
            done();
          });
        });
      });
    });

    it('should get current rate for different provider', function(done) {
      service.storage.storeFiatRate('BitPay', [{
        code: 'USD',
        value: 100.00,
      }], function(err) {
        should.not.exist(err);
        service.storage.storeFiatRate('Bitstamp', [{
          code: 'USD',
          value: 200.00,
        }], function(err) {
          should.not.exist(err);
          service.getRate({
            code: 'USD'
          }, function(err, res) {
            should.not.exist(err);
            res.rate.should.equal(100.00, 'Should use default provider');
            service.getRate({
              code: 'USD',
              provider: 'Bitstamp',
            }, function(err, res) {
              should.not.exist(err);
              res.rate.should.equal(200.00);
              done();
            });
          });
        });
      });
    });

    it('should get rate for specific ts', function(done) {
      var clock = sinon.useFakeTimers(0, 'Date');
      clock.tick(20);
      service.storage.storeFiatRate('BitPay', [{
        code: 'USD',
        value: 123.45,
      }], function(err) {
        should.not.exist(err);
        clock.tick(100);
        service.storage.storeFiatRate('BitPay', [{
          code: 'USD',
          value: 345.67,
        }], function(err) {
          should.not.exist(err);
          service.getRate({
            code: 'USD',
            ts: 50,
          }, function(err, res) {
            should.not.exist(err);
            res.ts.should.equal(50);
            res.rate.should.equal(123.45);
            res.fetchedOn.should.equal(20);
            clock.restore();
            done();
          });
        });
      });
    });

    it('should get rates for a series of ts', function(done) {
      var clock = sinon.useFakeTimers(0, 'Date');
      async.each([1.00, 2.00, 3.00, 4.00], function(value, next) {
        clock.tick(100);
        service.storage.storeFiatRate('BitPay', [{
          code: 'USD',
          value: value,
        }, {
          code: 'EUR',
          value: value,
        }], next);
      }, function(err) {
        should.not.exist(err);
        service.getRate({
          code: 'USD',
          ts: [50, 100, 199, 500],
        }, function(err, res) {
          should.not.exist(err);
          res.length.should.equal(4);

          res[0].ts.should.equal(50);
          should.not.exist(res[0].rate);
          should.not.exist(res[0].fetchedOn);

          res[1].ts.should.equal(100);
          res[1].rate.should.equal(1.00);
          res[1].fetchedOn.should.equal(100);

          res[2].ts.should.equal(199);
          res[2].rate.should.equal(1.00);
          res[2].fetchedOn.should.equal(100);

          res[3].ts.should.equal(500);
          res[3].rate.should.equal(4.00);
          res[3].fetchedOn.should.equal(400);

          clock.restore();
          done();
        });
      });
    });

    it('should not get rate older than 2hs', function(done) {
      var clock = sinon.useFakeTimers(0, 'Date');
      service.storage.storeFiatRate('BitPay', [{
        code: 'USD',
        value: 123.45,
      }], function(err) {
        should.not.exist(err);
        clock.tick(24 * 3600 * 1000); // Some time in the future
        service.getRate({
          ts: 2 * 3600 * 1000 - 1, // almost 2 hours
          code: 'USD',
        }, function(err, res) {
          should.not.exist(err);
          res.rate.should.equal(123.45);
          res.fetchedOn.should.equal(0);
          service.getRate({
            ts: 2 * 3600 * 1000 + 1, // just past 2 hours
            code: 'USD',
          }, function(err, res) {
            should.not.exist(err);
            should.not.exist(res.rate);
            clock.restore();
            done();
          });
        });
      });
    });

  });

  describe('#fetch', function() {
    it('should fetch rates from all providers', function(done) {
      var clock = sinon.useFakeTimers(100, 'Date');
      var bitpay = [{
        code: 'USD',
        rate: 123.45,
      }, {
        code: 'EUR',
        rate: 234.56,
      }];
      var bitstamp = {
        last: 120.00,
      };
      request.get.withArgs({
        url: 'https://bitpay.com/api/rates/',
        json: true
      }).yields(null, null, bitpay);
      request.get.withArgs({
        url: 'https://www.bitstamp.net/api/ticker/',
        json: true
      }).yields(null, null, bitstamp);

      service._fetch(function(err) {
        should.not.exist(err);
        service.getRate({
          code: 'USD'
        }, function(err, res) {
          should.not.exist(err);
          res.fetchedOn.should.equal(100);
          res.rate.should.equal(123.45);
          service.getRate({
            code: 'USD',
            provider: 'Bitstamp',
          }, function(err, res) {
            should.not.exist(err);
            res.fetchedOn.should.equal(100);
            res.rate.should.equal(120.00);
            service.getRate({
              code: 'EUR'
            }, function(err, res) {
              should.not.exist(err);
              res.fetchedOn.should.equal(100);
              res.rate.should.equal(234.56);
              clock.restore();
              done();
            });
          });
        });
      });
    });

    it('should not stop when failing to fetch provider', function(done) {
      var clock = sinon.useFakeTimers(100, 'Date');
      var bitstamp = {
        last: 120.00,
      };
      request.get.withArgs({
        url: 'https://bitpay.com/api/rates/',
        json: true
      }).yields('dummy error', null, null);
      request.get.withArgs({
        url: 'https://www.bitstamp.net/api/ticker/',
        json: true
      }).yields(null, null, bitstamp);

      service._fetch(function(err) {
        should.not.exist(err);
        service.getRate({
          code: 'USD'
        }, function(err, res) {
          should.not.exist(err);
          res.ts.should.equal(100);
          should.not.exist(res.rate)
          should.not.exist(res.fetchedOn)
          service.getRate({
            code: 'USD',
            provider: 'Bitstamp'
          }, function(err, res) {
            should.not.exist(err);
            res.fetchedOn.should.equal(100);
            res.rate.should.equal(120.00);
            clock.restore();
            done();
          });
        });
      });
    });
  });
});