/**
 * Within Viewport jQuery Plugin
 *
 * @description Companion plugin for withinViewport.js
 * @author      Craig Patik, http://patik.com/
 * @version     0.2
 * @date        2011-11-05
 */

;(function( $, window, undefined ) {
  
  /**
   * $.withinViewport()
   * @description          jQuery method
   * @param {Object}       [settings] optional settings
   * @return {Collection}  Contains all elements that were within the viewport
  */
  $.fn.withinViewport = function(settings) {
    if (typeof settings === "string") { settings = {sides: settings}; }
    var opts = $.extend({}, settings, {sides: "all"}), elems = [];
    this.each(function() {
      if (withinViewport(this, opts)) {
        elems.push(this);
      }
    });
    return $(elems);
  };
  
  // Custom selector
  $.extend($.expr[":"], {
    "within-viewport": function(element) {
      return withinViewport(element, "all");
    }
  });
  
  /**
   * Optional enhancements and shortcuts
   * 
   * @description Uncomment or comment these pieces as they apply to your project and coding preferences
   */
  
  // Shorthand jQuery methods
  //
  $.fn.withinViewportTop = function(settings) {
    if (typeof settings === "string") { settings = {sides: settings}; }
    var opts = $.extend({}, settings, {sides: "top"}), elems = [];
    this.each(function() {
      if (withinViewport(this, opts)) {
        elems.push(this);
      }
    });
    return $(elems);
  };
  
  $.fn.withinViewportRight = function(settings) {
    if (typeof settings === "string") { settings = {sides: settings}; }
    var opts = $.extend({}, settings, {sides: "right"}), elems = [];
    this.each(function() {
      if (withinViewport(this, opts)) {
        elems.push(this);
      }
    });
    return $(elems);
  };
  
  $.fn.withinViewportBottom = function(settings) {
    if (typeof settings === "string") { settings = {sides: settings}; }
    var opts = $.extend({}, settings, {sides: "bottom"}), elems = [];
    this.each(function() {
      if (withinViewport(this, opts)) {
        elems.push(this);
      }
    });
    return $(elems);
  };
  
  $.fn.withinViewportLeft = function(settings) {
    if (typeof settings === "string") { settings = {sides: settings}; }
    var opts = $.extend({}, settings, {sides: "left"}), elems = [];
    this.each(function() {
      if (withinViewport(this, opts)) {
        elems.push(this);
      }
    });
    return $(elems);
  };
  
  // Custom jQuery selectors
  //
  $.extend($.expr[":"], {
    "within-viewport-top": function(element) {
      return withinViewport(element, "top");
    },
    "within-viewport-right": function(element) {
      return withinViewport(element, "right");
    },
    "within-viewport-bottom": function(element) {
      return withinViewport(element, "bottom");
    },
    "within-viewport-left": function(element) {
      return withinViewport(element, "left");
    }
    //,
    // "within-viewport-top-left-45": function(element) {
    //   return withinViewport(element, {sides:'top left', top: 45, left: 45});
    // }
  });
  
})(jQuery, window);