feat: Add cron job for sending today's diet notifications

src/neis/neis.service.ts

@@ -1,19 +1,46 @@
 import { Injectable } from '@nestjs/common';
 import { NeisMealModel } from 'src/models/neis';
 import { FirebaseService } from '../firebase/firebase.service';
+import { Cron } from '@nestjs/schedule';
+import { ClassroomNo, Grade } from '../models/timetable';
 
 @Injectable()
 export class NeisService {
     constructor(private readonly firebase: FirebaseService) {}
 
+    // Monday to Friday at 12:50 PM
+    @Cron('50 12 * * 1-5')
+    async _sendTodayDiet() {
+        const today = new Date();
+        const diet = await this.getDiet(today);
+        if (diet[0]) {
+            Object.keys(Grade).forEach((grade) => {
+                Object.keys(ClassroomNo).forEach((classroom) => {
+                    this.firebase.sendNotificationByTopic(
+                        `meal`,
+                        `${Grade[grade]}-${ClassroomNo[classroom]}`,
+                        diet[1],
+                        diet[2],
+                        {
+                            title: diet[1],
+                            body: diet[2],
+                            type: 'meal',
+                            click_action: 'meal',
+                        },
+                    );
+                });
+            });
+        }
+    }
+
     async getDietInfo(dayString: string) {
         const url = `https://open.neis.go.kr/hub/mealServiceDietInfo?KEY=${process.env.NEIS_API_KEY}&Type=json&ATPT_OFCDC_SC_CODE=J10&SD_SCHUL_CODE=7531328&MLSV_YMD=${dayString}`;
         const response = await fetch(url, { cache: 'force-cache' });
 
         return (await response.json()) satisfies NeisMealModel;
     }
 
-    async getDiet(date: Date) {
+    async getDiet(date: Date): Promise<[boolean, string, string?]> {
         const year = date.getFullYear();
         const month = date.getMonth() + 1;
         const day = date.getDate();
@@ -26,18 +53,18 @@ export class NeisService {
             const dietInfo = (await this.getDietInfo(dayString))
                 .mealServiceDietInfo[1].row[0];
 
-            const diet = dietInfo.DDISH_NM.split('<br/>').map((item: string) =>
-                item.trim(),
+            const diet: string = dietInfo.DDISH_NM.split('<br/>').map(
+                (item: string) => item.trim(),
             );
-            const kcal = dietInfo.CAL_INFO;
+            const kcal: string = dietInfo.CAL_INFO;
 
             const result = [
                 true,
                 `${month}월 ${day}일 (${dayOfWeek}) 급식`,
                 `${diet}\n\n${kcal}`,
             ];
 
-            return result;
+            return result as [boolean, string, string];
         } catch (error) {
             return [false, `${month}월 ${day}일 (${dayOfWeek}) 급식`];
         }