/**
 * Task: attach_heads
 * Description: Set the heads for all themes declared in themes.json
 */

module.exports = function(grunt) {
  'use strict';

  var fs = require('fs');
  var path = require('path');

  grunt.registerTask('attach_heads', 'Set the heads recursively for all JS/CSS in themes.json', function() {
      var themeMetaObj = grunt.file.readJSON('themes.json');
      var pkgObject = grunt.file.readJSON('package.json');
      var banner =
            ' (v.'+pkgObject.version+')\n' +
            ' *  by '+pkgObject.name+' \n' +
            ' *  '+pkgObject.homepage+'\n' +
            ' *  Copyright (c) '+grunt.template.today("yyyy")+' '+pkgObject.name+'\n' +
            ' *  \n' +
            ' *  ============================================= */ \n';

      // iterate over the themeMetaObj for number of themes (default is declared here as well)
      for ( var key in themeMetaObj ) {
          var thisTheme = themeMetaObj[key];
          var headObj = {
            'devCss' : '../'+thisTheme._name+'/assets/css/main.css',
            'prodCss' : '../'+thisTheme._name+'/assets/css/main.min.css',
            'devJs' : '../'+thisTheme._name+'/assets/js/scripts.js',
            'prodJs' : '../'+thisTheme._name+'/assets/js/scripts.min.js'
          };
          var thisBanner = '';
          thisBanner = '/*! ================================================ \n' +
            ' * \n' +
            ' *  '+thisTheme._long_name+' Theme ' +
            banner;
          for ( var fileKey in headObj ) {
            var thisFile = headObj[fileKey];
            var content = grunt.file.read( thisFile );
            content = thisBanner + content;
            grunt.file.write( thisFile, content );
            grunt.log.writeln('"' + thisFile + '" updated with latest head.');
          }
      }
  });
};