/* angular-moment.js / v0.2.0 / (c) 2013 Uri Shaked / MIT Licence */

angular.module('angularMoment', [])
  .directive('amTimeAgo', ['$window', '$timeout', function ($window, $timeout) {
    'use strict';

    return function (scope, element, attr) {
      var activeTimeout = null;
      var currentValue;
      var currentFormat;

      function cancelTimer() {
        if (activeTimeout) {
          $timeout.cancel(activeTimeout);
          activeTimeout = null;
        }
      }

      function updateTime(momentInstance) {
        element.text(momentInstance.fromNow());
        var howOld = $window.moment().diff(momentInstance, 'minute');
        var secondsUntilUpdate = 3600;
        if (howOld < 1) {
          secondsUntilUpdate = 1;
        } else if (howOld < 60) {
          secondsUntilUpdate = 30;
        } else if (howOld < 180) {
          secondsUntilUpdate = 300;
        }

        activeTimeout = $timeout(function () {
          updateTime(momentInstance);
        }, secondsUntilUpdate * 1000, false);
      }

      function updateMoment() {
        cancelTimer();
        updateTime($window.moment(currentValue, currentFormat));
      }

      scope.$watch(attr.amTimeAgo, function (value) {
        if (typeof value === 'undefined' || value === null) {
          return;
        }

        if (angular.isNumber(value)) {
          // Milliseconds since the epoch
          value = new Date(value);
        }
        // else assume the given value is already a date

        currentValue = value;
        updateMoment();
      });

      attr.$observe('amFormat', function (format) {
        currentFormat = format;
        updateMoment();
      });

      scope.$on('$destroy', function () {
        cancelTimer();
      });
    };
  }])
  .filter('amDateFormat', ['$window', function ($window) {
    'use strict';

    return function (value, format) {
      if (typeof value === 'undefined' || value === null) {
        return '';
      }

      if (angular.isNumber(value)) {
        // Milliseconds since the epoch
        value = new Date(value);
      }
      // else assume the given value is already a date

      return $window.moment(value).format(format);
    };
  }]);