

angular.module('goApp.slider', [])
.directive('wallopSlider', function () {

    "use strict";

    return {
      template: '<div class="wallop-slider {{animationClass}}"><ul class="wallop-slider__list"><li class="wallop-slider__item {{itemClasses[$index]}}" ng-repeat="i in images"><img src="{{i}}"></li></ul><button ng-show="images.length>1" class="st-button wallop-slider__btn wallop-slider__btn--previous btn btn--previous" ng-disabled="prevDisabled" ng-click="onPrevButtonClicked()">Anterior</button><button ng-show="images.length>1" class="st-button wallop-slider__btn wallop-slider__btn--next btn btn--next" ng-disabled="nextDisabled" ng-click="onNextButtonClicked()">Próximo</button></div>',
      restrict: 'EA',
      transclude: true,
      replace: false,
      scope: {
        images: '=',
        animation: '@',
        currentItemIndex: '=',
        onNext: '&',
        onPrevious: '&'
      },
      controller: function($scope, $timeout) {

        $scope.itemClasses = [];

        $scope.$watch('images', function(images) {
          if (images.length) {
            _goTo(0);
          }
        });

        $scope.$watch('itemClasses', function(itemClasses) {
          console.log('itemClasses', itemClasses);
        });

        // set animation class corresponding to animation defined in CSS. e.g. rotate, slide
        if ($scope.animation) {
          $scope.animationClass = 'wallop-slider--' + $scope.animation;
        }

        var _displayOptions = {
          btnPreviousClass: 'wallop-slider__btn--previous',
          btnNextClass: 'wallop-slider__btn--next',
          itemClass: 'wallop-slider__item',
          currentItemClass: 'wallop-slider__item--current',
          showPreviousClass: 'wallop-slider__item--show-previous',
          showNextClass: 'wallop-slider__item--show-next',
          hidePreviousClass: 'wallop-slider__item--hide-previous',
          hideNextClass: 'wallop-slider__item--hide-next'
        };

        function updateClasses() {
          if ($scope.itemClasses.length !== $scope.images.length) {
            $scope.itemClasses = [];
            for (var i=0; i<$scope.images.length; i++) {
              $scope.itemClasses.push('');
            }
          }
        }
        function _nextDisabled() {
          console.log('$scope.currentItemIndex', $scope.currentItemIndex, $scope.images.length);

          return ($scope.currentItemIndex + 1) === $scope.images.length;
        }
        function _prevDisabled() {
          return !$scope.currentItemIndex;
        }
        function _updatePagination() {
          $scope.nextDisabled = _nextDisabled();
          $scope.prevDisabled = _prevDisabled();
        }
        function _clearClasses() {
          for (var i=0; i<$scope.images.length; i++) {
            $scope.itemClasses[i] = '';
          }

        }

        // go to slide
        function _goTo(index) {
          console.log('_goTo', index);
          if (index >= $scope.images.length || index < 0 || index === $scope.currentItemIndex) {

            if (!index) {
              $scope.itemClasses[0] = _displayOptions.currentItemClass;
            }
            return;
          }

          _clearClasses();

          $scope.itemClasses[$scope.currentItemIndex] = (index > $scope.currentItemIndex) ? _displayOptions.hidePreviousClass : _displayOptions.hideNextClass;

          var currentClass = (index > $scope.currentItemIndex) ? _displayOptions.showNextClass : _displayOptions.showPreviousClass;
          $scope.itemClasses[index] = _displayOptions.currentItemClass + ' ' + currentClass;

          $scope.currentItemIndex = index;

          _updatePagination();

        }

        // button event handlers
        // consider using the ng-tap directive to remove delay
        $scope.onPrevButtonClicked = function () {
          _goTo($scope.currentItemIndex - 1);
        };
        $scope.onNextButtonClicked = function () {
          _goTo($scope.currentItemIndex + 1);
        };

        $scope.$watch('currentItemIndex', function(newVal, oldVal) {
          if (oldVal > newVal) {
            if (typeof $scope.onPrevious === 'function') {
              $scope.onPrevious();
            }
          } else {
            if (typeof $scope.onNext === 'function') {
              $scope.onNext();
            }
          }
        });

      }
    };
});
