/**
 * TODO 类型说明 by xqq
 */
class QgEnum {
    constructor(data) {
        if (!Array.isArray(data)) {
            throw Error('argument is not an array!');
        }
        // 保存源数组
        this._source = data;
        this.getTypeArr();
    }

    getTypeArr() {
        this.typeArr = [];
        this._source.map(element => {
            if (!element.key || !element.text) {
                return;
            }
            this.typeArr.push(element.key);
            // 根据key生成不同属性值，以便A.B.text类型的调用
            Object.defineProperty(this, element.key, {
                value: element,
                writable: false
            });
            // this[element.key] = element;
        });
        // console.log(this);
        return this;
    }
    values() {
        return this._source;
    }
    // 根据key得到对象
    valueOf(key) {
        let prop = {
            key: '',
            text: ''
        };
        if (this.typeArr.indexOf(key) === -1) {
            prop = '';
            console.error(`${key}字段不存在该枚举数组中`);
        } else {
            prop = this._source[this.typeArr.indexOf(key)];
        }
        return prop;
    }

    // 根据key获取text值
    getText(key) {
        const prop = this.valueOf(key);
        let text = '--';
        if (prop) {
            text = prop.text;
        }

        return text;
    }
}

export default QgEnum;