//jQuery.makeEven - an equal columns jQuery plugin
//
(function ($) {
	'use strict';
	var otherChildren,
		getHighest,
		getLowestOffset,
		getPadding,
		haveSameParent,
		isWindowLoaded = false;
	
	$(window).load(function () {
		isWindowLoaded = true;
	});
			
	otherChildren = function (subSelector) {
			var totalHeight = 0;
			if (subSelector === undefined) {
				subSelector = '';
			}
			$(this).siblings().not(subSelector).each(function () {
				totalHeight += $(this).outerHeight(true);
			});
			return totalHeight;
	};
	
	getHighest = function (returnRef) {
		var highest = 0,
			highest_ref;
		$(this).each(function () {
			if ($(this).outerHeight(true) > highest) {
				highest = $(this).outerHeight(true);
				highest_ref = this;
			}
		});
		return (returnRef === true ? highest_ref : highest);
	};
	
	getLowestOffset = function (returnRef) {
		var highest = 0,
			highest_ref;
		
		$(this).each(function () {
			if ($(this).offset().top > highest) {
				highest = $(this).offset().top;
				highest_ref = this;
			}
		});
		return (returnRef === true ? highest_ref : highest);
	};
	
	getPadding = function (elem, withMargin) {
		var totalPad = 0,
			withMargin = withMargin || false;
		$(elem).each(function () {
			totalPad += $(this).outerHeight(withMargin) - $(this).height();
		});
		return totalPad;
	}
	
	haveSameParent = function (obj) {
		var test = true,
			lastObj = [];
		$.each(obj, function (i, v) {
			if (i > 0 && $(v).parent()[0] !== lastObj[0]) {
				test = false;
				return false;
			}
			lastObj = $(v).parent();
		});
		return test;
	};
	$.fn.makeEven = function (opts) {
		var highestHeight = 0,
			subs,
			differentParent = $(),
			lastSubParent,
			farthestDown,
			subParents = [],
			activeParents = [],
			matched = this,
			defaults = {
				subContainers: null,
				subIsSum: false,
				subGrowth: 'even'
			},
			activeOptions,
			main;
		activeOptions = $.extend({}, defaults, opts);
		main = function () {
			highestHeight = getHighest.call(matched);
			farthestDown = getLowestOffset.call(matched);
			matched.each(function () {
				var newHeight = 0,
					offsetDifference,
					final = highestHeight,
					t,
					theChildren = $(this).children().filter(activeOptions.subContainers),
					currentParentOffset,
					tallestChild,
					remainingChildren,
					remainingHeight,
					distributeHeight,
					currentParentPadding,
					childPadding,
					temp;
				
				if ($(this).height() < highestHeight) {
					final -= getPadding(this, false);
				}
				offsetDifference = farthestDown - $(this).offset().top;
				final += offsetDifference;
				$(this).height(final);
				if (activeOptions.subContainers !== null) {
					if (theChildren.length === 0) {
						return true;
					}
					currentParentOffset = farthestDown - $(this).offset().top;
					tallestChild = getHighest.call(theChildren, true);
					remainingChildren = theChildren.not(tallestChild);
					remainingHeight = highestHeight + currentParentOffset - otherChildren.call(theChildren, activeOptions.subContainers);
					distributeHeight = highestHeight + currentParentOffset - otherChildren.call(theChildren, remainingChildren);
					currentParentPadding = getPadding(this, true);
					childPadding = getPadding(theChildren, true);
					temp;
					if (activeOptions.subIsSum === true) {
						temp = distributeHeight / remainingChildren.length;
						remainingChildren.height(temp);
					} else {
						theChildren.height((remainingHeight) - currentParentPadding - childPadding);
					}
				}
			});
		};
		if (isWindowLoaded === true) {
			main();
		} else {
			$(window).load(function () {
				main();
			});
		}
		return this;
	};
}(jQuery));