module.exports = function(gulp, argv, buildConfig) {

  var snapshotConfig = require('./snapshot.config').config;
  var _ = require('lodash');
  var http = require('http');
  var connect = require('connect');
  var serveStatic = require('serve-static');
  var cp = require('child_process');
  var path = require('canonical-path');

  var projectRoot = path.resolve(__dirname, '../..');
  var protractorHttpServer;
  var snapshotValues = _.merge(snapshotConfig.platformDefauls, argv);

  gulp.task('protractor-server', function() {
    var app = connect().use(serveStatic(projectRoot));  // serve everything that is static
    protractorHttpServer = http.createServer(app).listen(buildConfig.protractorPort);
    console.log('Serving `dist` on http://localhost:' + buildConfig.protractorPort);
  });

  gulp.task('snapshot', ['clean.build', 'protractor-server'], function(done) {
    snapshot(done);
  });

  gulp.task('snapshot-quick', ['e2e', 'protractor-server'], function(done) {
    snapshot(done, true);
  });

  gulp.task('e2e-publish', function(done) {
    var testId = generateTestId();
    e2ePublish(testId, true);
  });

  function snapshot(done, quickMode) {

    if (!snapshotConfig.accessKey || !snapshotConfig.accessKey.length) {
      console.error('Missing IONIC_SNAPSHOT_KEY environment variable');
      return done();
    }

    var testId = generateTestId();

    var protractorConfigFile = path.resolve(projectRoot, 'scripts/snapshot/protractor.config.js');

    snapshotValues.params.test_id = testId;
    snapshotValues.params.upload = !quickMode;

    var protractorArgs = [
      '--browser ' + snapshotValues.browser,
      '--platform ' + snapshotValues.platform,
      '--params.platform_id=' +  snapshotValues.params.platform_id,
      '--params.platform_index=' +  snapshotValues.params.platform_index,
      '--params.platform_count=' +  snapshotValues.params.platform_count,
      '--params.width=' +  snapshotValues.params.width,
      '--params.height=' +  snapshotValues.params.height,
      '--params.test_id=' +  snapshotValues.params.test_id,
      '--params.upload=' +  snapshotValues.params.upload
    ];

    e2ePublish(testId, false);

    return protractor(done, [protractorConfigFile].concat(protractorArgs));
  }

  function protractor(done, args) {
    var child = cp.spawn('protractor', args, {
      stdio: [process.stdin, process.stdout, 'pipe']
    });

    child.stderr.on('data', function(data) {
      protractorHttpServer.close();
      done('Protractor tests failed. Error:', data.toString());
    });

    child.on('exit', function() {
      protractorHttpServer.close();
      done();
    });
  }

  function e2ePublish(testId, verbose) {
    console.log('e2ePublish: ' + testId);
    snapshotConfig.testId = testId;
    snapshotConfig.verbose = verbose;
    require('../e2e/e2e-publish')(snapshotConfig);
  }

  function generateTestId() {
    var chars = 'abcdefghijklmnopqrstuvwxyz';
    var id = chars.charAt(Math.floor(Math.random() * chars.length));
    chars += '0123456789';
    while (id.length < 4) {
      id += chars.charAt(Math.floor(Math.random() * chars.length));
    }
    return id;
  }

};