/*
 * @Author: 疯狂秀才(Lucas Huang)
 * @Date: 2019-09-02 17:55:57
 * @LastEditors: 疯狂秀才(Lucas Huang)
 * @LastEditTime: 2019-10-23 16:57:28
 * @QQ: 1055818239
 * @Version: v0.0.1
 */
import { format, isValid, parseISO } from 'date-fns';
import { Injectable } from '@angular/core';
import { MyDateConverter } from './myDateConverter';

@Injectable({
    providedIn: 'root'
})
export class DateTimeHelperService {

    private $D = null;

    constructor() {
        this.$D = new MyDateConverter();
    }
    /**
     * @param value 要转换格式的日期
     * @param fmt 格式化字符串
     *
     * 更多的格式化请参考
     * [点我点我](https://date-fns.org/v1.30.1/docs/format)
     */
    formatTo(value: any, fmt: string = 'yyyy-MM-dd') {
        if (!value) {
            return '';
        }

        if (typeof value === 'string' && value.indexOf('0001') > -1) {
            return '';
        }

        if (value instanceof Date) {
            return format(value, fmt);
        }

        let _d: any = parseISO(value);

        if (_d == 'Invalid Date') {
            _d = this.createDate(value) || new Date(value);
        }

        // const d = parseISO(value);
        if (isValid(_d)) {
            const d = parseISO(format(_d, 'yyyy-MM-dd HH:mm:ss'));
            return format(d, fmt);
        } else {
            throw new Error('给定的值不能转换为日期');
        }
    }

    private createDate(val)     {
        return this.$D.create(val);
    }

}