(function () {

  'use strict';

  var gulp  = require('gulp');
  var glob  = require('glob');
  var del   = require('del');
  var $     = require('gulp-load-plugins')();
  var pkg   = require('./package.json');

  var _short_name   = pkg.shortName.toLowerCase();
  var _bower_dir    = 'bower_components';
  var _theme_dir    = 'web/wp-content/themes';
  var _child_dir    = _theme_dir + '/' + _short_name;
  var _assets_dir   = _child_dir + '/assets';
  var _src_dir      = _assets_dir + '/src';
  var _dist_dir     = _assets_dir + '/dist';
  var _dev_dir      = _assets_dir + '/dev';
  var _img_dir      = _assets_dir + '/images';
  var _banner       = '/*!' + (pkg.title || pkg.name) + ' - v' + pkg.version + ' - ' + (new Date()).toDateString() + '*/\n';
  var _clrgrd_opts  = {
    whitelist: [
      ['#fff', '#fefefe']
    ]
  };

  // Cleans the dist directory
  gulp.task('clean:dist', function(callback) {
    del([_dist_dir + '/**'], callback);
  });


  // Cleans the dev directory
  gulp.task('clean:dev', function(callback) {
    del([_dev_dir + '/**'], callback);
  });


  // Lints the gulpfile for errors
  gulp.task('lint:gulpfile', function() {
    gulp.src('gulpfile.js')
      .pipe( $.jshint() )
      .pipe( $.jshint.reporter('default') );
  });


  // Lints the source js files for errors
  gulp.task('lint:src', function() {
    var _src = [
      _src_dir + '/js/**/*.js',
      '!**/libs/**/*.js'
    ];
    var _options = {
      lookup: _src_dir + '/.jshintrc'
    };

    gulp.src(_src)
      .pipe( $.jshint(_options) )
      .pipe( $.jshint.reporter('default') );
  });

  // Concatonates, minifies and renames the source JS files for Dist
  gulp.task('scripts:dist', function() {
    glob.sync(_src_dir + '/js/*', function(err, matches) {
      if (err) { throw err; }

      if (matches.length) {
        matches.forEach(function(match) {
          var dir = match.split('/js/')[1];
          var scripts = [
            _src_dir + '/js/' + dir + '/libs/**/*.js',
            _src_dir + '/js/' + dir + '/**/*.js'
          ];

          if (dir === 'footer') {
            var footer_scripts = [
              _bower_dir + '/history.js/scripts/uncompressed/history.js',
              _bower_dir + '/history.js/scripts/uncompressed/history.adapter.jquery.js',
            ];

            scripts = footer_scripts.concat(scripts);
          }

          gulp.src(scripts)
            .pipe( $.plumber() )
            .pipe( $.concat(dir + '.js') )
            .pipe( $.uglify() )
            .pipe( $.header(_banner, {pkg : pkg}) )
            .pipe( $.rename(dir + '.min.js') )
            .pipe( gulp.dest(_dist_dir) );
        });
      }
    });
  });


  // Concatonates the source JS files for Dev
  gulp.task('scripts:dev', function() {
    glob.sync(_src_dir + '/js/*', function(err, matches) {
      if (err) { throw err; }

      if (matches.length) {
        matches.forEach(function(match) {
          var dir = match.split('/js/')[1];
          var scripts = [
            _src_dir   + '/js/' + dir + '/libs/**/*.js',
            _src_dir   + '/js/' + dir + '/**/*.js'
          ];

          gulp.src(scripts)
            .pipe( $.plumber() )
            .pipe( $.concat(dir + '.js') )
            .pipe( gulp.dest(_dev_dir) );
        });
      }
    });
  });


  // Compiles and compresses the source Sass files for Dist
  gulp.task('styles:dist', function() {
    var _sass_opts = {
      loadPath:     _bower_dir,
      style:        'compressed',
      lineNumbers:  false
    };

    gulp.src(_src_dir + '/scss/style.scss')
      .pipe( $.plumber() )
      .pipe( $.rubySass(_sass_opts) )
      .pipe( $.colorguard(_clrgrd_opts) )
      .pipe( $.rename('style.min.css') )
      .pipe( gulp.dest(_dist_dir) );
  });


  // Compiles the source Sass files for Dev
  gulp.task('styles:dev', function() {
    var _sass_opts = {
      loadPath:     _bower_dir,
      style:        'expanded',
      lineNumbers:  true
    };

    gulp.src(_src_dir + '/scss/style.scss')
      .pipe( $.plumber() )
      .pipe( $.rubySass(_sass_opts) )
      .pipe( $.colorguard(_clrgrd_opts) )
      .pipe( gulp.dest(_dev_dir) );
  });


  // Minimizes all the images
  gulp.task('images', function() {
    var _options = {
      progressive: true,
      svgoPlugins: [{removeViewBox: false}]
    };
    gulp.src(_img_dir + '/src/**/*')
      .pipe( $.changed(_img_dir + '/min/') )
      .pipe( $.imagemin(_options) )
      .pipe( gulp.dest(_img_dir + '/min/') );
  });


  // Lints all the js files for errors
  gulp.task('lint', [
    'lint:gulpfile',
    'lint:src'
  ]);


  // Builds for distribution (staging or production)
  gulp.task('build', [
    'clean:dist',
    'lint',
    'scripts:dist',
    'styles:dist',
    'images'
  ]);


  // Builds for development (local)
  gulp.task('build:dev', [
    'clean:dev',
    'lint:src',
    'scripts:dev',
    'styles:dev',
  ]);


  // Builds assets and reloads the page when any php, html, img or dev files change
  gulp.task('watch', function() {
    $.livereload.listen();

    gulp.watch(_src_dir + '/scss/**/*', ['sass:dev']);
    gulp.watch(_src_dir + '/js/**/*', [
      'lint:src',
      'scripts:dev'
    ]);

    gulp.watch([
      _child_dir + '/**/*.php',
      _child_dir + '/**/*.html',
      _dev_dir + '/**/*',
      _img_dir + '/*'
    ]).on('change', $.livereload.changed);
  });


  // Backup default task just triggers a build
  gulp.task('default', ['build']);

}());