import template from "./ImagePreviewGroup.html";

  angular.module("esNgAntd").directive("antdImagePreviewGroup", ["esNgAntd", function (esNgAntd) {
    return {
      template: template,
      restrict: "E",
      replace: true,
      transclude: true,
      scope: {
        preview: "="
      },
      controller: function ($scope, $element, $attrs) {
        $scope.state = {
          current: 0,
          visible: false,
          src: null,
          childrens: []
        };

        $scope.addChildren = function (children) {
          [children].forEach(function (value, key) {
            if ([undefined, null, ""].includes(value)) {
              throw new Error(`${["children"][key]} parameter of addChildren method is required.`);
            }
          });
          $scope.state.childrens.push(children);
          return $scope.state.childrens.length - 1;
        };

        $scope.setCurrent = function (value) {
          [value].forEach(function (value, key) {
            if ([undefined, null, ""].includes(value)) {
              throw new Error(`${["value"][key]} parameter of setCurrent method is required.`);
            }
          });
          $scope.state.current = value;

          if (typeof $scope.preview === "object" && typeof $scope.preview.onCurrentChange === "function") {
            $scope.preview.onCurrentChange(value);
          }
        };

        $scope.setVisible = function (value) {
          [value].forEach(function (value, key) {
            if ([undefined, null, ""].includes(value)) {
              throw new Error(`${["value"][key]} parameter of setVisible method is required.`);
            }
          });
          $scope.state.visible = value;

          if (typeof $scope.preview === "object" && typeof $scope.preview.onVisibleChange === "function") {
            $scope.preview.onVisibleChange(value);
          }
        };

        $scope.handleOpen = function (index) {
          [index].forEach(function (value, key) {
            if ([undefined, null, ""].includes(value)) {
              throw new Error(`${["index"][key]} parameter of handleOpen method is required.`);
            }
          });
          $scope.setCurrent(index);
          $scope.state.src = $scope.state.childrens[index].state.src;
          $scope.setVisible(true);
        };

        $scope.handleClose = function () {
          $scope.setVisible(false);
        };

        $scope.handlePrev = function () {
          $scope.setCurrent($scope.state.current > 0 ? $scope.state.current - 1 : 0);
          $scope.state.src = $scope.state.childrens[$scope.state.current].state.src;
        };

        $scope.handleNext = function () {
          $scope.setCurrent($scope.state.current < $scope.state.childrens.length - 1 ? $scope.state.current + 1 : $scope.state.childrens.length - 1);
          $scope.state.src = $scope.state.childrens[$scope.state.current].state.src;
        };

        $scope.handlePreview = function () {
          let className;

          if ($attrs.class) {
            className = ` ${$attrs.class}`;
          }

          esNgAntd.createLayer(`

              <div class="ant-image-preview-root${className}">

                  <div class="ant-image-preview-mask" ng-if="state.visible"></div>
                  <div class="ant-image-preview-wrap" ng-show="state.visible">
                      <div class="ant-image-preview">
                          <div class="ant-image-preview-content">
                              <div class="ant-image-preview-body">
                                  <ul class="ant-image-preview-operations">
                                      <li class="ant-image-preview-operations-operation">
                                          <span class="anticon anticon-close ant-image-preview-operations-icon" ng-click="handleClose()">

                                              <antd-icon type="CloseOutlined"></antd-icon>

                                          </span>
                                      </li> 
                                  </ul>
                                  <div class="ant-image-preview-img-wrapper">
                                      <img class="ant-image-preview-img" ng-src="{{state.src}}"/>
                                  </div>
                                  <div ng-class="{'ant-image-preview-switch-left': true, 'ant-image-preview-switch-left-disabled': state.current===0}" ng-click="handlePrev()">

                                      <antd-icon type="LeftOutlined"></antd-icon>

                                  </div>
                                  <div ng-class="{'ant-image-preview-switch-right': true,'ant-image-preview-switch-right-disabled': (state.childrens.length-1)===state.current}"  ng-click="handleNext()">

                                      <antd-icon type="RightOutlined"></antd-icon>

                                  </div>
                              </div>
                          </div>
                      </div>
                  </div>
              </div>

          `, $scope);
        };
  
        this.getContext = function () {
          return $scope;
        };
      },
      link: function ($scope, $element, $attrs) {
        [$element, $attrs].forEach(function (value, key) {
          if ([undefined, null, ""].includes(value)) {
            throw new Error(`${["$element", "$attrs"][key]} parameter of constructor method is required.`);
          }
        });
        $scope.handlePreview();
      }
    };
  }]);