(function($) {
  $.wpsdb = {
    /**
     * Implement a WordPress-link Hook System for Javascript
     * TODO: Change 'tag' to 'args', allow number (priority), string (tag),
       object (priority+tag)
     */
    hooks: {
      action: {},
      filter: {}
    },
    add_action: function(action, callable, tag) {
      jQuery.wpsdb.add_hook('action', action, callable, tag);
    },
    add_filter: function(action, callable, tag) {
      jQuery.wpsdb.add_hook('filter', action, callable, tag);
    },
    do_action: function(action, args) {
      jQuery.wpsdb.do_hook('action', action, null, args);
    },
    apply_filters: function(action, value, args) {
      return jQuery.wpsdb.do_hook('filter', action, value, args);
    },
    remove_action: function(action, tag) {
      jQuery.wpsdb.remove_hook('action', action, tag);
    },
    remove_filter: function(action, tag) {
      jQuery.wpsdb.remove_hook('filter', action, tag);
    },
    add_hook: function(hook_type, action, callable, tag) {
      if (undefined == jQuery.wpsdb.hooks[hook_type][action]) {
        jQuery.wpsdb.hooks[hook_type][action] = [];
      }
      var hooks = jQuery.wpsdb.hooks[hook_type][action];
      if (undefined == tag) {
        tag = action + '_' + hooks.length;
      }
      jQuery.wpsdb.hooks[hook_type][action].push({
        tag: tag,
        callable: callable
      });
    },
    do_hook: function(hook_type, action, value, args) {
      if (undefined != jQuery.wpsdb.hooks[hook_type][action]) {
        var hooks = jQuery.wpsdb.hooks[hook_type][action];
        for (var i = 0; i < hooks.length; i++) {
          if ('action' == hook_type) {
            hooks[i].callable(args);
          } else {
            value = hooks[i].callable(value, args);
          }
        }
      }
      if ('filter' == hook_type) {
        return value;
      }
    },
    remove_hook: function(hook_type, action, tag) {
      if (undefined != jQuery.wpsdb.hooks[hook_type][action]) {
        var hooks = jQuery.wpsdb.hooks[hook_type][action];
        for (var i = hooks.length - 1; i >= 0; i--) {
          if (undefined == tag || tag == hooks[i].tag)
            hooks.splice(i, 1);
        }
      }
    }
  };
})(jQuery);