import { mapgis } from '../common/base';
import { cloneDeep } from 'lodash';
import { VisualVariable } from './VisualVariable';

/**
 * 视觉变量-透明度视觉变量
 * @class mapgis.renderer.OpacityVariable
 * @classdesc 视觉变量-透明度视觉变量
 * @param {String} [type] 视觉变量类型,只能是 'opacity'
 * @param {String} [field] 视觉变量字段
 * @param {String} [valueExpression] 计算表达式,用来对要素中的单/多个属性进行数学计算
 * @param {String} [valueExpressionTitle] 计算表达式标题
 * @param {String} [normalizationType] 归一化类型,可选 "field"|"percent-of-total"|"log"
 * @param {String} [normalizationField] 归一化字段,将renderer中对应字段数据值除以归一化字段数据值
 * @param {Number} [normalizationTotal] 归一化值,将renderer中对应字段数据值除以所有数据值的总和
 * @param {Array<OpacityStop>} [stops] 视觉变量透明度数组,定义在一系列停靠点中应用于要素的透明度
 */
export default class OpacityVariable extends VisualVariable {
 constructor(option) {
 super(option);
 var options = option ? option : {};
 const { type = "opacity" } = options;
 this.type = type;
 const { field, valueExpression, valueExpressionTitle, normalizationType, normalizationField, normalizationTotal, stops } = options;
 this.field = field;
 this.valueExpression = valueExpression;
 this.valueExpressionTitle = valueExpressionTitle;
 this.normalizationType = normalizationType;
 this.normalizationField = normalizationField;
 this.normalizationTotal = normalizationTotal;
 this.stops = stops;
 }

 /**
 * @description 克隆函数
 */
 clone() {
 return cloneDeep(this);
 }

 /**
 * @description 将JSON格式的视觉变量转换为JS对象
 * @param {Object} json 视觉变量的实例化JSON
 */
 fromJSON(json) {
 json = json || {};
 const { type = "opacity" } = json;
 this.type = type;
 const { field, valueExpression, valueExpressionTitle, normalizationType, normalizationField, normalizationTotal, stops } = json;
 this.field = field;
 this.valueExpression = valueExpression;
 this.valueExpressionTitle = valueExpressionTitle;
 this.normalizationType = normalizationType;
 this.normalizationField = normalizationField;
 this.normalizationTotal = normalizationTotal;
 this.stops = stops;
 }

 /**
 * 将JS对象转换为JSON格式
 * @returns {Object} 视觉变量的实例化JSON
 */
 toJSON() {
 return {
 type: this.type,
 field: this.field,
 valueExpression: this.valueExpression,
 valueExpressionTitle: this.valueExpressionTitle,
 normalizationType: this.normalizationType,
 normalizationField: this.normalizationField,
 normalizationTotal: this.normalizationTotal,
 stops: this.stops,
 };
 }
}

export { OpacityVariable };
mapgis.renderer.OpacityVariable = OpacityVariable;