'use strict';

/**
 * 0.1.1
 * General-purpose jQuery wrapper. Simply pass the plugin name as the expression.
 *
 * It is possible to specify a default set of parameters for each jQuery plugin.
 * Under the jq key, namespace each plugin by that which will be passed to ui-jq.
 * Unfortunately, at this time you can only pre-define the first parameter.
 * @example { jq : { datepicker : { showOn:'click' } } }
 *
 * @param ui-jq {string} The $elm.[pluginName]() to call.
 * @param [ui-options] {mixed} Expression to be evaluated and passed as options to the function
 *     Multiple parameters can be separated by commas
 * @param [ui-refresh] {expression} Watch expression and refire plugin on changes
 *
 * @example <input ui-jq="datepicker" ui-options="{showOn:'click'},secondParameter,thirdParameter" ui-refresh="iChange">
 */
angular.module('ui.jq', ['ui.load']).
  value('uiJqConfig', {}).
  directive('uiJq', ['uiJqConfig', 'JQ_CONFIG', 'uiLoad', '$timeout', function uiJqInjectingFunction(uiJqConfig, JQ_CONFIG, uiLoad, $timeout) {

  return {
    restrict: 'A',
    compile: function uiJqCompilingFunction(tElm, tAttrs) {

      if (!angular.isFunction(tElm[tAttrs.uiJq]) && !JQ_CONFIG[tAttrs.uiJq]) {
        throw new Error('ui-jq: The "' + tAttrs.uiJq + '" function does not exist');
      }
      var options = uiJqConfig && uiJqConfig[tAttrs.uiJq];

      return function uiJqLinkingFunction(scope, elm, attrs) {

        function getOptions(){
          var linkOptions = [];

          // If ui-options are passed, merge (or override) them onto global defaults and pass to the jQuery method
          if (attrs.uiOptions) {
            linkOptions = scope.$eval('[' + attrs.uiOptions + ']');
            if (angular.isObject(options) && angular.isObject(linkOptions[0])) {
              linkOptions[0] = angular.extend({}, options, linkOptions[0]);
            }
          } else if (options) {
            linkOptions = [options];
          }
          return linkOptions;
        }

        // If change compatibility is enabled, the form input's "change" event will trigger an "input" event
        if (attrs.ngModel && elm.is('select,input,textarea')) {
          elm.bind('change', function() {
            elm.trigger('input');
          });
        }

        // Call jQuery method and pass relevant options
        function callPlugin() {
          $timeout(function() {
            elm[attrs.uiJq].apply(elm, getOptions());
          }, 0, false);
        }

        function refresh(){
          // If ui-refresh is used, re-fire the the method upon every change
          if (attrs.uiRefresh) {
            scope.$watch(attrs.uiRefresh, function(newValue, oldValue) {
              if(newValue == oldValue) return;
              callPlugin();
            });
          }
        }

        if ( JQ_CONFIG[attrs.uiJq] ) {
          uiLoad.load(JQ_CONFIG[attrs.uiJq]).then(function() {
            callPlugin();
            refresh();
          }).catch(function() {
            
          });
        } else {
          callPlugin();
          refresh();
        }
      };
    }
  };
}]);
