82 lines
2.4 KiB
TypeScript
Executable File
82 lines
2.4 KiB
TypeScript
Executable File
/**
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* @file reminder.service.ts
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* @description 提醒服务,用于处理问题截止日期提醒相关的业务逻辑
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* @author xxx
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* @date 2023-xx-xx
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*/
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import { Injectable, Logger } from '@nestjs/common';
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import dayjs from 'dayjs';
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import { MessageService } from '@server/models/message/message.service';
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/**
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* 提醒服务类
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*/
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@Injectable()
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export class ReminderService {
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/**
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* 日志记录器实例
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* @private
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*/
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private readonly logger = new Logger(ReminderService.name);
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/**
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* 构造函数
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* @param messageService 消息服务实例
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*/
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constructor(private readonly messageService: MessageService) { }
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/**
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* 生成提醒时间点
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* @param totalDays 总天数
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* @returns 提醒时间点数组
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*/
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generateReminderTimes(totalDays: number): number[] {
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// 如果总天数小于3天则不需要提醒
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if (totalDays < 3) return [];
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// 使用Set存储提醒时间点,避免重复
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const reminders: Set<number> = new Set();
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// 按照2的幂次方划分时间点
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for (let i = 1; i <= totalDays / 2; i++) {
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reminders.add(Math.ceil(totalDays / Math.pow(2, i)));
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}
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// 将Set转为数组并升序排序
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return Array.from(reminders).sort((a, b) => a - b);
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}
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/**
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* 判断是否需要发送提醒
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* @param createdAt 创建时间
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* @param deadline 截止时间
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* @returns 是否需要提醒及剩余天数
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*/
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shouldSendReminder(createdAt: Date, deadline: Date) {
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// 获取当前时间
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const now = dayjs();
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const end = dayjs(deadline);
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// 计算总时间和剩余时间(天)
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const totalTimeDays = end.diff(createdAt, 'day');
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const timeLeftDays = end.diff(now, 'day');
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if (totalTimeDays > 1) {
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// 获取提醒时间点
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const reminderTimes = this.generateReminderTimes(totalTimeDays);
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// 如果剩余时间在提醒时间点内,则需要提醒
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if (reminderTimes.includes(timeLeftDays)) {
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return { shouldSend: true, timeLeft: timeLeftDays };
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}
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}
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return { shouldSend: false, timeLeft: timeLeftDays };
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}
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/**
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* 发送截止日期提醒
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*/
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async remindDeadline() {
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this.logger.log('开始检查截止日期以发送提醒。');
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}
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}
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