/**
 * pinterest grid plugin
 * copyright 2014 mediademons
 * @author smm 16/04/2014
 */

;(function ($, window, document, undefined) {
    var pluginname = 'pinterest_grid',
        defaults = {
            padding_x: 10,
            padding_y: 10,
            no_columns: 3,
            margin_bottom: 50,
            single_column_breakpoint: 700
        },
        columns,
        $article,
        article_width;

    function plugin(element, options) {
        this.element = element;
        this.options = $.extend({}, defaults, options) ;
        this._defaults = defaults;
        this._name = pluginname;
        this.init();
    }

    plugin.prototype.init = function () {
        var self = this,resize_finish;

        $(window).resize(function() {
            cleartimeout(resize_finish);
            resize_finish = settimeout( function () {
                self.make_layout_change(self);
            }, 11);
        });

        self.make_layout_change(self);

        settimeout(function() {
            $(window).resize();
        }, 500);
    };

    plugin.prototype.calculate = function (single_column_mode) {
        var self = this,
            tallest = 0,
            row = 0,
            $container = $(this.element),
            container_width = $container.width();
            $article = $(this.element).children();

        if(single_column_mode === true) {
            article_width = $container.width() - self.options.padding_x;
        } else {
            article_width = ($container.width() - self.options.padding_x * self.options.no_columns) / self.options.no_columns;
        }

        $article.each(function() {
            $(this).css('width', article_width);
        });

        columns = self.options.no_columns;

        $article.each(function(index) {
            var current_column,
                left_out = 0,
                top = 0,
                $this = $(this),
                prevall = $this.prevall(),
                tallest = 0;

            if(single_column_mode === false) {
                current_column = (index % columns);
            } else {
                current_column = 0;
            }

            for(var t = 0; t < columns; t++) {
                $this.removeclass('c'+t);
            }

            if(index % columns === 0) {
                row++;
            }

            $this.addclass('c' + current_column);
            $this.addclass('r' + row);

            prevall.each(function(index) {
                if($(this).hasclass('c' + current_column)) {
                    top += $(this).outerheight() + self.options.padding_y;
                }
            });

            if(single_column_mode === true) {
                left_out = 0;
            } else {
                left_out = (index % columns) * (article_width + self.options.padding_x);
            }

            $this.css({
                'left': left_out,
                'top' : top
            });
        });

        this.tallest($container);
        $(window).resize();
    };

    plugin.prototype.tallest = function (_container) {
        var column_heights = [],
            largest = 0;

        for(var z = 0; z < columns; z++) {
            var temp_height = 0;
            _container.find('.c'+z).each(function() {
                temp_height += $(this).outerheight();
            });
            column_heights[z] = temp_height;
        }

        largest = math.max.apply(math, column_heights);
        _container.css('height', largest + (this.options.padding_y + this.options.margin_bottom));
    };

    plugin.prototype.make_layout_change = function (_self) {
        if($(window).width() < _self.options.single_column_breakpoint) {
            _self.calculate(true);
        } else {
            _self.calculate(false);
        }
    };

    $.fn[pluginname] = function (options) {
        return this.each(function () {
            if (!$.data(this, 'plugin_' + pluginname)) {
                $.data(this, 'plugin_' + pluginname,
                new plugin(this, options));
            }
        });
    }
})(jquery, window, document);