feat: generate quiz of the day with static variables

schema.graphql

@@ -196,6 +196,9 @@ type Query {
 
   """Get the list of all quizzes based on multiple filter."""
   quizList(country: String, status: QuizStatus): [QuizData!]!
+
+  """Get the quiz of the day"""
+  quizOfTheDay: QuizData!
   quizRating(quizId: String!): Int!
 
   """Get the list of all quizzes based on the country"""

src/resolvers/quiz.resolver.ts

@@ -1,3 +1,4 @@
+import { differenceInCalendarDays } from 'date-fns';
 import { Arg, Authorized, Ctx, Mutation, Query, registerEnumType, Resolver } from 'type-graphql';
 import AttemptModel from '../models/attempt.model';
 import QuizModel from '../models/quiz.model';
@@ -120,4 +121,32 @@ export default class QuizResolver {
       errorHandler(error);
     }
   }
+
+  lastGeneratedQuiz: Date | undefined = undefined;
+  currentQuizOfDayId: any = undefined;
+
+  @Query(() => QuizData, { description: 'Get the quiz of the day' })
+  async quizOfTheDay() {
+    try {
+      // Generate the quiz of today if it's the first time
+      if (!this.lastGeneratedQuiz || !this.currentQuizOfDayId) {
+        const quizzes = await QuizModel.find();
+
+        this.lastGeneratedQuiz = new Date();
+        this.currentQuizOfDayId = quizzes[Math.floor(Math.random() * quizzes.length)];
+      }
+
+      // Generate the quiz of today
+      if (differenceInCalendarDays(new Date(), this.lastGeneratedQuiz) >= 1) {
+        const quizzes = await QuizModel.find();
+
+        this.lastGeneratedQuiz = new Date();
+        this.currentQuizOfDayId = quizzes[Math.floor(Math.random() * quizzes.length)];
+      }
+
+      return this.currentQuizOfDayId;
+    } catch (error) {
+      errorHandler(error);
+    }
+  }
 }