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Copyright (C) 2015 The Android Open Source Project

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

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<link rel="import" href="../bower_components/polymer/polymer.html">

<dom-module id="gr-date-formatter">
  <template>
    <style>
      :host {
        display: inline;
      }
    </style>
    <span>[[_computeDateStr(dateStr)]]</span>
  </template>
  <script>
  (function() {
    'use strict';

    var Duration = {
      HOUR: 1000 * 60 * 60,
      DAY: 1000 * 60 * 60 * 24,
    };

    var ShortMonthNames = [
      'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct',
      'Nov', 'Dec'
    ];

    Polymer({
      is: 'gr-date-formatter',

      properties: {
        dateStr: {
          type: String,
          value: null,
          notify: true
        }
      },

      _computeDateStr: function(dateStr) {
        return this._dateStr(this._parseDateStr(dateStr), new Date());
      },

      _parseDateStr: function(dateStr) {
        if (!dateStr) { return null; }
        return util.parseDate(dateStr);
      },

      _dateStr: function(t, now) {
        if (!t) { return ''; }
        var diff = now.getTime() - t.getTime();
        if (diff < Duration.DAY && t.getDay() == now.getDay()) {
          // Within 24 hours and on the same day:
          // '2:14 AM'
          var pm = t.getHours() >= 12;
          var hours = t.getHours() === 0 ? 12 :
              pm ? t.getHours() - 12 : t.getHours();
          var minutes = t.getMinutes() < 10 ? '0' + t.getMinutes() :
              t.getMinutes();
          return hours + ':' + minutes + (pm ? ' PM' : ' AM');
        } else if ((t.getDay() != now.getDay() || diff >= Duration.DAY) &&
                   diff < 180 * Duration.DAY) {
          // From one to six months:
          // 'Aug 29'
          return ShortMonthNames[t.getMonth()] + ' ' + t.getDate();
        } else if (diff >= 180 * Duration.DAY) {
          // More than six months:
          // 'Aug 29, 1997'
          return ShortMonthNames[t.getMonth()] + ' ' + t.getDate() + ', ' +
              t.getFullYear();
        }
      },

    });
  })();
  </script>
</dom-module>