/*
 * Javascript Humane Dates
 * Copyright (c) 2008 Dean Landolt (deanlandolt.com)
 * Re-write by Zach Leatherman (zachleat.com)
 *
 * Adopted from the John Resig's pretty.js
 * at http://ejohn.org/blog/javascript-pretty-date
 * and henrah's proposed modification
 * at http://ejohn.org/blog/javascript-pretty-date/#comment-297458
 *
 * Licensed under the MIT license.
 */

function humane_date(date_str){
  var time_formats = [
    [60,          'Just Now'],
    [90,          '1 Minute'], // 60*1.5
    [3600,        'Minutes', 60], // 60*60, 60
    [5400,        '1 Hour'], // 60*60*1.5
    [86400,       'Hours', 3600], // 60*60*24, 60*60
    [129600,      '1 Day'], // 60*60*24*1.5
    [604800,      'Days', 86400], // 60*60*24*7, 60*60*24
    [907200,      '1 Week'], // 60*60*24*7*1.5
    [2628000,     'Weeks', 604800], // 60*60*24*(365/12), 60*60*24*7
    [3942000,     '1 Month'], // 60*60*24*(365/12)*1.5
    [31536000,    'Months', 2628000], // 60*60*24*365, 60*60*24*(365/12)
    [47304000,    '1 Year'], // 60*60*24*365*1.5
    [3153600000,  'Years', 31536000], // 60*60*24*365*100, 60*60*24*365
    [4730400000,  '1 Century'], // 60*60*24*365*100*1.5
  ];

  var time = ('' + date_str).replace(/-/g,"/").replace(/[TZ]/g," "),
    dt = new Date,
    seconds = ((dt - new Date(time) + (dt.getTimezoneOffset() * 60000)) / 1000),
    token = ' Ago',
    i = 0,
    format;

  if (seconds < 0) {
    seconds = Math.abs(seconds);
    token = '';
  }

  while (format = time_formats[i++]) {
    if (seconds < format[0]) {
      if (format.length == 2) {
        return format[1] + (i > 1 ? token : ''); // Conditional so we don't return Just Now Ago
      } else {
        return Math.round(seconds / format[2]) + ' ' + format[1] + (i > 1 ? token : '');
      }
    }
  }

  // overflow for centuries
  if(seconds > 4730400000)
    return Math.round(seconds / 4730400000) + ' Centuries' + token;

  return date_str;
};

if(typeof jQuery != 'undefined') {
  jQuery.fn.humane_dates = function(){
    return this.each(function(){
      var date = humane_date(jQuery(this).attr('rel'));
      if(date && jQuery(this).text() != date) // don't modify the dom if we don't have to
        jQuery(this).text(date);
    });
  };
}