/*
	Author: The Bridge
	Copyright (c): 2011 The Bridge
	Created: 01-11-2011
	Last Modified: 20-01-2012
	Name: Scrolload
	Description: Handle section load
*/
 
(function($) {
    $.fn.scrolload = function(options) {
        var settings = {
            threshold    : 0,
            failurelimit : 0,
            event        : "scroll",
            effect       : "show",
            container    : window,
            webpath: 'http://the-bridge.co.uk/'
        };
                
        if(options) {
            $.extend(settings, options);
        }

        /* Fire one scroll event per scroll. Not one scroll event per item. */
        var elements = this;
        
        if ("scroll" == settings.event) {
            $(settings.container).bind("scroll", function(event) {
                var counter = 0;
                
                elements.each(function() {
                    if ($.abovethetop(this, settings)) {
                            /* Nothing. */
                    } else if (!$.belowthefold(this, settings)) {
                            $(this).trigger("appear");
                    } else {
                        if (counter++ > settings.failurelimit) {
                            return false;
                        }
                    }
                });
                
                /* Remove item from array so it is not looped next time. */
                var temp = $.grep(elements, function(element) {
                    return !element.loaded;
                });
                
                elements = $(temp);
            });
        }
        
        this.each(function() {
            var self = this;
            
            if ("scroll" != settings.event || 
                    undefined == $(self).attr("src") || 
                    ($.abovethetop(self, settings) ||
                     $.belowthefold(self, settings))) {
                        
                if (settings.placeholder) {
                    $(self).attr("src", settings.placeholder);      
                } else {
                    $(self).removeAttr("src");
                }
                
                self.loaded = false;
            } else {
                self.loaded = true;
            }
            
            /* When appear is triggered load original item. */
            $(self).one("appear", function() {
                if (!this.loaded) {
                    switch($(self).attr("id")){
			    		case 'content_1_box': director.load(1); break;
			    		case 'content_2_box': director.load(2); break;
			    		case 'content_3_container_i': director.load(3); break;
			    		case 'content_4_container_i': director.load(4); break;
			    		case 'content_5_container_i': director.load(5); break;
			    		case 'content_6_box': director.load(6); break;
			    		case 'content_7_container_i': director.load(7); break;
			    		case 'content_8_container_i': director.load(8); break;
			    	}
                };
            });

            /* When wanted event is triggered load original item */
            /* by triggering appear.                              */
            if ("scroll" != settings.event) {
                $(self).bind(settings.event, function(event) {
                    if (!self.loaded) {
                        $(self).trigger("appear");
                    }
                });
            }
        });
        
        /* Force initial check if items should appear. */
        $(settings.container).trigger(settings.event);
        
        return this;

    };

    /* Convenience methods in jQuery namespace.           */
    /* Use as  $.belowthefold(element, {threshold : 100, container : window}) */

    $.belowthefold = function(element, settings) {
        if (settings.container === undefined || settings.container === window) {
            var fold = $(window).height() + $(window).scrollTop();
        } else {
            var fold = $(settings.container).offset().top + $(settings.container).height();
        }
        return fold <= $(element).offset().top - settings.threshold;
    };
    
    $.rightoffold = function(element, settings) {
        if (settings.container === undefined || settings.container === window) {
            var fold = $(window).width() + $(window).scrollLeft();
        } else {
            var fold = $(settings.container).offset().left + $(settings.container).width();
        }
        return fold <= $(element).offset().left - settings.threshold;
    };
        
    $.abovethetop = function(element, settings) {
        if (settings.container === undefined || settings.container === window) {
            var fold = $(window).scrollTop();
        } else {
            var fold = $(settings.container).offset().top;
        }
        return fold >= $(element).offset().top + settings.threshold  + $(element).height();
    };
    
    $.leftofbegin = function(element, settings) {
        if (settings.container === undefined || settings.container === window) {
            var fold = $(window).scrollLeft();
        } else {
            var fold = $(settings.container).offset().left;
        }
        return fold >= $(element).offset().left + settings.threshold + $(element).width();
    };
    /* Custom selectors for your convenience.   */
    /* Use as $("img:below-the-fold").something() */

    $.extend($.expr[':'], {
        "below-the-fold" : "$.belowthefold(a, {threshold : 0, container: window})",
        "above-the-fold" : "!$.belowthefold(a, {threshold : 0, container: window})",
        "right-of-fold"  : "$.rightoffold(a, {threshold : 0, container: window})",
        "left-of-fold"   : "!$.rightoffold(a, {threshold : 0, container: window})"
    });
})(jQuery);