module.exports = function(parser) {
  /**
   * Test dependencies.
   */

  //var parser = require('../lib/');
  var expect = require('expect.js');

  /**
   * Shortcuts
   */

  var encode = parser.encodePacket;
  var decode = parser.decodePacket;
  var encPayload = parser.encodePayload;
  var decPayload = parser.decodePayload;

  /**
   * Tests.
   */

  describe('parser', function () {

    describe('packets', function () {
      describe('basic functionality', function () {
        it('should encode packets as strings', function (done) {
          encode({ type: 'message', data: 'test' }, function(data) {
            expect(data).to.be.a('string');
            done();
          });
        });

        it('should decode packets as objects', function (done) {
          encode({ type: 'message', data: 'test' }, function(data) {
            expect(decode(data)).to.be.an('object');
            done();
          });
        });
      });

      describe('encoding and decoding', function () {
        it('should allow no data', function (done) {
          encode({ type: 'message' }, function(data) {
            expect(decode(data)).to.eql({ type: 'message' });
            done();
          });
        });

        it('should encode an open packet', function (done) {
          encode({ type: 'open', data: '{"some":"json"}' }, function(data) {
            expect(decode(data)).to.eql({ type: 'open', data: '{"some":"json"}' });
            done();
          });
        });

        it('should encode a close packet', function (done) {
          encode({ type: 'close' }, function(data) {
            expect(decode(data)).to.eql({ type: 'close' });
            done();
          });
        });

        it('should encode a ping packet', function (done) {
          encode({ type: 'ping', data: '1' }, function(data) {
            expect(decode(data)).to.eql({ type: 'ping', data: '1' });
            done();
          });
        });

        it('should encode a pong packet', function (done) {
          encode({ type: 'pong', data: '1' }, function(data) {
            expect(decode(data)).to.eql({ type: 'pong', data: '1' });
            done();
          });
        });

        it('should encode a message packet', function (done) {
          encode({ type: 'message', data: 'aaa' }, function(data) {
            expect(decode(data)).to.eql({ type: 'message', data: 'aaa' });
            done();
          });
        });

        it('should encode a utf8 special chars message packet', function (done) {
          encode({ type: 'message', data: 'utf8 — string' }, function(data) {
            expect(decode(data)).to.eql({ type: 'message', data: 'utf8 — string' });
            done();
          });
        });

        it('should not utf8 encode by default', function(done) {
          encode({ type: 'message', data: '€€€' }, function(data) {
            expect(data).to.be('4€€€');
            done();
          });
        });

        it('should not utf8 encode by default', function(done) {
          encode({ type: 'message', data: '€€€' }, true, true, function(data) {
            expect(data).to.be('4€€€');
            done();
          });
        });

        it('should encode a message packet coercing to string', function (done) {
          encode({ type: 'message', data: 1 }, function(data) {
            expect(decode(data)).to.eql({ type: 'message', data: 1 });
            done();
          });
        });

        it('should encode an upgrade packet', function (done) {
          encode({ type: 'upgrade' }, function(data) {
            expect(decode(data)).to.eql({ type: 'upgrade' });
            done();
          });
        });

        it('should match the encoding format', function () {
          encode({ type: 'message', data: 'test' }, function(data) {
            expect(data).to.match(/^[0-9]/);
          });
          encode({ type: 'message' }, function(data) {
            expect(data).to.match(/^[0-9]$/);
         });
        });

        it('should encode a string message with lone surrogates replaced by U+FFFD', function(done) {
          var data = '\uDC00\uD834\uDF06\uDC00 \uD800\uD835\uDF07\uD800';
          encode({ type: 'message', data: data }, null, true, function(encoded) {
            expect(decode(encoded, null, true)).to.eql({ type: 'message', data: '\uFFFD\uD834\uDF06\uFFFD \uFFFD\uD835\uDF07\uFFFD' });
            done();
          });
        });
      });

      describe('decoding error handing', function () {
        var err = { type: 'error', data: 'parser error' };

        it('should disallow empty payload', function () {
          expect(decode(undefined)).to.eql(err);
        });

        it('should disallow bad format', function () {
          expect(decode(':::')).to.eql(err);
        });

        it('should disallow inexistent types', function () {
          expect(decode('94103')).to.eql(err);
        });

        it('should disallow invalid utf8', function () {
          expect(decode('4\uffff', false, true)).to.eql(err);
        });
      });
    });

    describe('payloads', function () {
      describe('basic functionality', function () {
        it('should encode payloads as strings', function (done) {
          encPayload([{ type: 'ping' }, { type: 'post' }], function(data) {
            expect(data).to.be.a('string');
            done();
          });
        });
      });

      describe('basic functionality', function () {
        it('should encode string payloads as strings even if binary supported', function (done) {
          encPayload([{ type: 'ping' }, { type: 'post' }], true, function(data) {
            expect(data).to.be.a('string');
            done();
          });
        });
      });

      describe('encoding and decoding', function () {
        var seen = 0;
        it('should encode/decode packets', function (done) {
          encPayload([{ type: 'message', data: 'a' }], function(data) {
            decPayload(data,
              function(packet, index, total) {
                var isLast = index + 1 == total;
                expect(isLast).to.eql(true);
                seen++;
              });
          });
          encPayload([{type: 'message', data: 'a'}, {type: 'ping'}], function(data) {
            decPayload(data,
              function(packet, index, total) {
                var isLast = index + 1 == total;
                if (!isLast) {
                  expect(packet.type).to.eql('message');
                } else {
                  expect(packet.type).to.eql('ping');
                  if (seen == 2) { done(); }
                }
                seen++;
              });
          });
        });

        it('should encode/decode empty payloads', function () {
          encPayload([], function(data) {
            decPayload(data,
              function (packet, index, total) {
                expect(packet.type).to.eql('open');
                var isLast = index + 1 == total;
                expect(isLast).to.eql(true);
              });
          });
        });

        it('should not utf8 encode when dealing with strings only', function() {
          encPayload([{ type: 'message', data: '€€€' }, { type: 'message', data: 'α' }], function(data) {
            expect(data).to.eql('4:4€€€2:4α');
          });
        });
      });

      describe('decoding error handling', function () {
        var err = { type: 'error', data: 'parser error' };

        it('should err on bad payload format', function () {
          decPayload('1!', function (packet, index, total) {
            var isLast = index + 1 == total;
            expect(packet).to.eql(err);
            expect(isLast).to.eql(true);
          });
          decPayload('', function (packet, index, total) {
            var isLast = index + 1 == total;
            expect(packet).to.eql(err);
            expect(isLast).to.eql(true);
          });
          decPayload('))', function (packet, index, total) {
            var isLast = index + 1 == total;
            expect(packet).to.eql(err);
            expect(isLast).to.eql(true);
          });

          if ('undefined' == typeof window || window.Int8Array) {
            var data = 'undefined' !== typeof window ? (new Int8Array([64])).buffer : new Buffer([64]);
            decPayload(data, function (packet, index, total) {
              var isLast = index + 1 == total;
              expect(packet).to.eql(err);
              expect(isLast).to.eql(true);
            });
          }
        });

        it('should err on bad payload length', function () {
          // line 137
          decPayload('1:', function (packet, index, total) {
            var isLast = index + 1 == total;
            expect(packet).to.eql(err);
            expect(isLast).to.eql(true);
          });
        });

        it('should err on bad packet format', function () {
          // line 137
          decPayload('3:99:', function (packet, index, total) {
            var isLast = index + 1 == total;
            expect(packet).to.eql(err);
            expect(isLast).to.eql(true);
          });
          // line 146
          decPayload('1:aa', function (packet, index, total) {
            var isLast = index + 1 == total;
            expect(packet).to.eql(err);
            expect(isLast).to.eql(true);
          });
          // line 137
          decPayload('1:a2:b', function (packet, index, total) {
            var isLast = index + 1 == total;
            expect(packet).to.eql(err);
            expect(isLast).to.eql(true);
          });
        });

      });
    });
  });
};