/*
 * JavaScript Pretty Date
 * Copyright (c) 2008 John Resig (jquery.com)
 * Licensed under the MIT license.
 */

// Takes an ISO time and returns a string representing how
// long ago the date represents.
function prettyDate(time, offset){
	var date = new Date((time || "").replace(/-/g,"/").replace(/[TZ]/g," "));
    var diff = ((new Date()).getTime() - date.getTime());
    if (offset) {
        diff = offset + diff;
    }
    diff /= 1000;
    var day_diff = Math.floor(diff / 86400);

	if ( isNaN(day_diff) || day_diff < 0 || day_diff >= 31 )
		return;

	return day_diff == 0 && (
			diff < 1 && _("Just now") ||
			diff < 60 && Math.floor(diff) + _(" seconds ago") ||
			diff < 120 && _("1 minute ago") ||
			diff < 3600 && Math.floor( diff / 60 ) + _(" minutes ago") ||
			diff < 7200 && _("1 hour ago") ||
			diff < 86400 && Math.floor( diff / 3600 ) + _(" hours ago")) ||
		day_diff == 1 && _("Yesterday") ||
		day_diff < 7 && day_diff + _(" days ago") ||
		day_diff < 31 && Math.ceil( day_diff / 7 ) + _(" weeks ago");
}

// If jQuery is included in the page, adds a jQuery plugin to handle it as well
if ( typeof jQuery != "undefined" )
	jQuery.fn.prettyDate = function(){
		return this.each(function(){
			var date = prettyDate(this.title);
			if ( date )
				jQuery(this).text( date );
		});
	};