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          dateFormat = value || datepickerPopupConfig.dateFormat;
          ngModel.$render();
      });

      var closeOnDateSelection = angular.isDefined(attrs.closeOnDateSelection) ? originalScope.$eval(attrs.closeOnDateSelection) : datepickerPopupConfig.closeOnDateSelection;
      var appendToBody = angular.isDefined(attrs.datepickerAppendToBody) ? originalScope.$eval(attrs.datepickerAppendToBody) : datepickerPopupConfig.appendToBody;

      // create a child scope for the datepicker directive so we are not polluting original scope
      var scope = originalScope.$new();

      originalScope.$on('$destroy', function() {
        scope.$destroy();
      });

      attrs.$observe('currentText', function(text) {
        scope.currentText = angular.isDefined(text) ? text : datepickerPopupConfig.currentText;
      });
      attrs.$observe('toggleWeeksText', function(text) {
        scope.toggleWeeksText = angular.isDefined(text) ? text : datepickerPopupConfig.toggleWeeksText;
      });
      attrs.$observe('clearText', function(text) {
        scope.clearText = angular.isDefined(text) ? text : datepickerPopupConfig.clearText;
      });
      attrs.$observe('closeText', function(text) {
        scope.closeText = angular.isDefined(text) ? text : datepickerPopupConfig.closeText;
      });

      var getIsOpen, setIsOpen;
      if ( attrs.isOpen ) {
        getIsOpen = $parse(attrs.isOpen);
        setIsOpen = getIsOpen.assign;

        originalScope.$watch(getIsOpen, function updateOpen(value) {
          scope.isOpen = !! value;
        });
      }
      scope.isOpen = getIsOpen ? getIsOpen(originalScope) : false; // Initial state

      function setOpen( value ) {
        if (setIsOpen) {
          setIsOpen(originalScope, !!value);
        } else {
          scope.isOpen = !!value;
        }
      }

      var documentClickBind = function(event) {
        if (scope.isOpen && event.target !== element[0]) {
          scope.$apply(function() {
            setOpen(false);
          });
        }
      };

      var elementFocusBind = function() {
        scope.$apply(function() {
          setOpen( true );
        });
      };

      // popup element used to display calendar
      var popupEl = angular.element('<div datepicker-popup-wrap><div datepicker></div></div>');
      popupEl.attr({
        'ng-model': 'date',
        'ng-change': 'dateSelection()'
      });
      var datepickerEl = angular.element(popupEl.children()[0]);
      if (attrs.datepickerOptions) {
        datepickerEl.attr(angular.extend({}, originalScope.$eval(attrs.datepickerOptions)));
      }

      // TODO: reverse from dateFilter string to Date object
      function parseDate(viewValue) {
        if (!viewValue) {
          ngModel.$setValidity('date', true);
          return null;
        } else if (angular.isDate(viewValue)) {
          ngModel.$setValidity('date', true);
          return viewValue;
        } else if (angular.isString(viewValue)) {
          var date = new Date(viewValue);
          if (isNaN(date)) {
            ngModel.$setValidity('date', false);
            return undefined;
          } else {
            ngModel.$setValidity('date', true);
            return date;
          }
        } else {
          ngModel.$setValidity('date', false);
          return undefined;
        }
      }
      ngModel.$parsers.unshift(parseDate);

      // Inner change
      scope.dateSelection = function() {
        ngModel.$setViewValue(scope.date);
        ngModel.$render();

        if (closeOnDateSelection) {
          setOpen( false );
        }
      };

      element.bind('input change keyup', function() {
        scope.$apply(function() {
          updateCalendar();
        });
      });

      // Outter change
      ngModel.$render = function() {
        var date = ngModel.$viewValue ? dateFilter(ngModel.$viewValue, dateFormat) : '';
        element.val(date);

        updateCalendar();
      };

      function updateCalendar() {
        scope.date = ngModel.$modelValue;