;(function() {
  'use strict';

  var ecstatic = require('ecstatic'),
      http = require('http'),
      path = require('path'),
      request = require('request'),
      SauceTunnel = require('sauce-tunnel'),
      url = require('url');

  var port = 8081,
      username = process.env.SAUCE_USERNAME,
      accessKey = process.env.SAUCE_ACCESS_KEY;

  var platforms = [
    ['Windows 7', 'chrome', ''],
    ['Windows 7', 'firefox', '25'],
    ['Windows 7', 'firefox', '20'],
    ['Windows 7', 'firefox', '10'],
    ['Windows 7', 'firefox', '6'],
    ['Windows 7', 'firefox', '4'],
    ['Windows 7', 'firefox', '3'],
    ['WIN8.1', 'internet explorer', '11']
    ['Windows 7', 'internet explorer', '10'],
    ['Windows 7', 'internet explorer', '9'],
    ['Windows 7', 'internet explorer', '8'],
    ['Windows XP', 'internet explorer', '7'],
    ['Windows XP', 'internet explorer', '6'],
    ['OS X 10.8', 'safari', '6'],
    ['Windows 7', 'safari', '5']
  ];

  // create a web server for the local dir
  var mount = ecstatic({
    root: path.resolve(__dirname, '..'),
    cache: false
  });

  http.createServer(function(req, res) {
    var parsedUrl = url.parse(req.url, true);
    var compat = parsedUrl.query.compat;
    if (compat) {
      // see http://msdn.microsoft.com/en-us/library/ff955275(v=vs.85).aspx
      res.setHeader('X-UA-Compatible', 'IE=' + compat);
    }
    mount(req, res);
  }).listen(port);

  // set up sauce connect so we can use this server from saucelabs
  var tunnelTimeout = 10000,
      tunnel = new SauceTunnel(username, accessKey, null, true, tunnelTimeout);

  console.log('Opening sauce connect tunnel...');

  tunnel.start(function(success) {
    if (success) {
      console.log('Sauce connect tunnel opened');
      runTests();
    } else {
      // fail without an exit code for pull requests
      console.error('Failed to open sauce connect tunnel');
      process.exit(0);
    }
  });

  function runTests() {
    var testDefinition = {
      'framework': 'qunit',
      'platforms': platforms,
      'url': 'http://localhost:' + port + '/test/index.html'
    };

    console.log('Starting saucelabs tests: ' + JSON.stringify(testDefinition));

    request.post('https://saucelabs.com/rest/v1/' + username + '/js-tests', {
      'auth': { 'user': username, 'pass': accessKey },
      'json': testDefinition
    }, function(error, response, body) {
      if (response.statusCode == 200) {
        waitForTestCompletion(body);
      } else {
        console.error('Failed to submit test to Sauce Labs, status ' + response.statusCode + ', body:\n' + JSON.stringify(body));
        process.exit(3);
      }
    });
  }

  function waitForTestCompletion(testIdentifier) {
    request.post('https://saucelabs.com/rest/v1/' + username + '/js-tests/status', {
      'auth': { 'user': username, 'pass': accessKey },
      'json': testIdentifier
    }, function(error, response, body) {
        if (response.statusCode == 200) {
          if (body.completed) {
            handleTestResults(body['js tests']);
          } else {
            waitForTestCompletion(testIdentifier);
          }
        } else {
          console.error('Failed to check test status on Sauce Labs, status ' + response.statusCode + ', body:\n' + JSON.stringify(body));
          process.exit(4);
        }
    });
  }

  function handleTestResults(results) {
    var failingTests = results.filter(function(test) {
      return !test.result || test.result.failed;
    });

    var failingPlatforms = failingTests.map(function(test) {
      return test.platform;
    });

    if (!failingTests.length) {
      console.log('Tests passed');
    }
    else {
      console.error('Tests failed on platforms: ' + JSON.stringify(failingPlatforms));

      failingTests.forEach(function(test) {
        var details =  'See ' + test.url + ' for details.',
            platform = JSON.stringify(test.platform),
            result = test.result;

        if (result && result.failed) {
          console.error(result.failed + ' failures on ' + platform + '. ' + details);
        } else {
          console.error('Testing on ' + platform + ' failed; no results available. ' + details);
        }
      });
    }

    console.log('Shutting down sauce connect tunnel...');

    tunnel.stop(function() {
      process.exit(allTestsSuccessful ? 0 : 1);
    });
  }
}());