(function ($) {
	function widget(element, options, callback) {
		this.element = element;
		this.options = options;
		this.callback = $.isFunction(callback) ? callback : $.noop;
	}
	
	widget.prototype = (function() {
		
		function _widgetRun(widget) {
			if (!widget.options) {
				widget.element.append('<span class="error">Options for widget are not set.</span>');
				return;
			}
		        var callback = widget.callback;
			var element = widget.element;
			var user = widget.options.user;
			var repo = widget.options.repo;
			var branch = widget.options.branch;
			var last = widget.options.last == undefined ? 0 : widget.options.last;
			var limitMessage = widget.options.limitMessageTo == undefined ? 0 : widget.options.limitMessageTo;
			
			element.append('<h3>Widget intitalization, please wait...</h3>');
			gh.commit.forBranch(user, repo, branch, function (data) {
				var commits = data.commits;
				var totalCommits = (last < commits.length ? last : commits.length);
				
				element.empty();
				element.append('<ul>');
				
				for (var c = 0; c < totalCommits; c++) {
					element.append(
						'<li>' +
						' ' + avatar(commits[c].author.email) +
						' ' + author(commits[c].author.login) + 
						' commited ' + message(commits[c].message, commits[c].url) + 
						' ' + when(commits[c].committed_date) + 
						'</li>');
				}
				element.append('</ul>');
				element.append('<br/><h5>by <a href="https://github.com/alexanderbeletsky/github.commits.widget">github.commits.widget</a></h5>');
				callback(element);
				
				function avatar(email) {
					var emailHash = hex_md5(email);
					return '<img src="http://www.gravatar.com/avatar/' + emailHash + '?s=20"/>';
				}
				
				function author(login) {
					return '<a href="https://github.com/' + login + '">' + login + '</a>';
				}
				
				function message(commitMessage, url) {
					if (limitMessage > 0 && commitMessage.length > limitMessage)
					{
						commitMessage = commitMessage.substr(0, limitMessage) + '...';
					}
					return '"' + '<a href="https://github.com' + url + '">' + commitMessage + '</a>"';
				}
				
				function when(commitDate) {
					var commitTime = new Date(commitDate).getTime();
					var todayTime = new Date().getTime();
					
					var differenceInDays = Math.floor(((todayTime - commitTime)/(24*3600*1000)));
					if (differenceInDays == 0) {
						var differenceInHours = Math.floor(((todayTime - commitTime)/(3600*1000)));
						if (differenceInHours == 0) {
							var differenceInMinutes = Math.floor(((todayTime - commitTime)/(600*1000)));
							if (differenceInMinutes == 0) {
								
								return 'just now';
							}
							
							return 'about ' + differenceInMinutes + ' minutes ago';
						}
						
						return 'about ' + differenceInHours + ' hours ago';
					}
					
					return differenceInDays + ' days ago';
				}
			});
		}
		
		return {
			run: function () {
				_widgetRun(this);
			}
		};
		
	})();

	$.fn.githubInfoWidget = function(options, callback) {
		var w = new widget(this, options, callback);
		w.run();
		
		return this;
	}
	
})(jQuery);