/**
 * timeago is a jquery plugin that makes it easy to support automatically
 * updating fuzzy timestamps (e.g. "4 minutes ago" or "about 1 day ago").
 *
 * @name timeago
 * @version 0.11.3
 * @requires jquery v1.2.3+
 * @author ryan mcgeary
 * @license mit license - http://www.opensource.org/licenses/mit-license.php
 *
 * for usage and examples, visit:
 * http://timeago.yarp.com/
 *
 * copyright (c) 2008-2012, ryan mcgeary (ryan -[at]- mcgeary [*dot*] org)
 */
(function($) {
  $.timeago = function(timestamp) {
    if (timestamp instanceof date) {
      return inwords(timestamp);
    } else if (typeof timestamp === "string") {
      return inwords($.timeago.parse(timestamp));
    } else if (typeof timestamp === "number") {
      return inwords(new date(timestamp));
    } else {
      return inwords($.timeago.datetime(timestamp));
    }
  };
  var $t = $.timeago;

  $.extend($.timeago, {
    settings: {
      refreshmillis: 60000,
      allowfuture: false,
      strings: {
        prefixago: null,
        prefixfromnow: null,
//        suffixago: "ago",
//        suffixfromnow: "from now",
//        seconds: "less than a minute",
//        minute: "about a minute",
//        minutes: "%d minutes",
//        hour: "about an hour",
//        hours: "about %d hours",
//        day: "a day",
//        days: "%d days",
//        month: "about a month",
//        months: "%d months",
//        year: "about a year",
//        years: "%d years",
		 suffixago: "前",
        suffixfromnow: "从现在",
        seconds: "1分钟前",
        minute: "约1分钟",
        minutes: "%d分钟",
        hour: "约1小时",
        hours: "约 %d小时",
        day: "1天",
        days: "%d天",
        month: "约1个月",
        months: "%d个月",
        year: "约1年",
        years: "%d 年",
        wordseparator: "",
        numbers: []
      }
    },
    inwords: function(distancemillis) {
      var $l = this.settings.strings;
      var prefix = $l.prefixago;
      var suffix = $l.suffixago;
      if (this.settings.allowfuture) {
        if (distancemillis < 0) {
          prefix = $l.prefixfromnow;
          suffix = $l.suffixfromnow;
        }
      }

      var seconds = math.abs(distancemillis) / 1000;
      var minutes = seconds / 60;
      var hours = minutes / 60;
      var days = hours / 24;
      var years = days / 365;

      function substitute(stringorfunction, number) {
        var string = $.isfunction(stringorfunction) ? stringorfunction(number, distancemillis) : stringorfunction;
        var value = ($l.numbers && $l.numbers[number]) || number;
        return string.replace(/%d/i, value);
      }

      var words = seconds < 45 && substitute($l.seconds, math.round(seconds)) ||
        seconds < 90 && substitute($l.minute, 1) ||
        minutes < 45 && substitute($l.minutes, math.round(minutes)) ||
        minutes < 90 && substitute($l.hour, 1) ||
        hours < 24 && substitute($l.hours, math.round(hours)) ||
        hours < 42 && substitute($l.day, 1) ||
        days < 30 && substitute($l.days, math.round(days)) ||
        days < 45 && substitute($l.month, 1) ||
        days < 365 && substitute($l.months, math.round(days / 30)) ||
        years < 1.5 && substitute($l.year, 1) ||
        substitute($l.years, math.round(years));

      var separator = $l.wordseparator === undefined ?  " " : $l.wordseparator;
      return $.trim([prefix, words, suffix].join(separator));
    },
    parse: function(iso8601) {
      var s = $.trim(iso8601);
      s = s.replace(/\.\d\d\d+/,""); // remove milliseconds
      s = s.replace(/-/,"/").replace(/-/,"/");
      s = s.replace(/t/," ").replace(/z/," utc");
      s = s.replace(/([\+\-]\d\d)\:?(\d\d)/," $1$2"); // -04:00 -> -0400
      return new date(s);
    },
    datetime: function(elem) {
      var iso8601 = $t.istime(elem) ? $(elem).attr("datetime") : $(elem).attr("title");
      return $t.parse(iso8601);
    },
    istime: function(elem) {
      // jquery's `is()` doesn't play well with html5 in ie
      return $(elem).get(0).tagname.tolowercase() === "time"; // $(elem).is("time");
    }
  });

  $.fn.timeago = function() {
    var self = this;
    self.each(refresh);

    var $s = $t.settings;
    if ($s.refreshmillis > 0) {
      setinterval(function() { self.each(refresh); }, $s.refreshmillis);
    }
    return self;
  };

  function refresh() {
    var data = preparedata(this);
    if (!isnan(data.datetime)) {
      $(this).text(inwords(data.datetime));
    }
    return this;
  }

  function preparedata(element) {
    element = $(element);
    if (!element.data("timeago")) {
      element.data("timeago", { datetime: $t.datetime(element) });
      var text = $.trim(element.text());
      if (text.length > 0 && !($t.istime(element) && element.attr("title"))) {
        element.attr("title", text);
      }
    }
    return element.data("timeago");
  }

  function inwords(date) {
    return $t.inwords(distance(date));
  }

  function distance(date) {
    return (new date().gettime() - date.gettime());
  }

  // fix for ie6 suckage
  document.createelement("abbr");
  document.createelement("time");
}(jquery));