feat: find random question

Author: tituschewxj

apps/question-service/handlers/findmatchingquestion.go

@@ -3,15 +3,59 @@ package handlers
 import (
 	"context"
 	"log"
+	"math/rand"
 	pb "proto/questionmatching"
+	"question-service/models"
+
+	"cloud.google.com/go/firestore"
 )
 
 func (s *GrpcServer) FindMatchingQuestion(ctx context.Context, req *pb.MatchQuestionRequest) (*pb.QuestionFound, error) {
 	log.Printf("Received matching question request: %v", req)
+
+	var question *models.Question
+
+	// Match by both topic and difficulty
+
+	// Match by just topic
+
+	// Match by difficulty
+
+	// No matches, so return random question
+	if question == nil {
+		randomQuestion, err := retrieveRandomQuestion(s.Client, ctx)
+		if err != nil {
+			return nil, err
+		}
+		question = randomQuestion
+	}
+
 	return &pb.QuestionFound{
-		QuestionId:         1,
-		QuestionName:       "abc",
-		QuestionDifficulty: "Easy",
-		QuestionTopics:     []string{"Algorithms", "Arrays"},
+		QuestionId:         question.ID,
+		QuestionName:       question.Title,
+		QuestionDifficulty: question.Complexity.String(),
+		QuestionTopics:     question.Categories,
 	}, nil
 }
+
+func retrieveRandomQuestion(client *firestore.Client, ctx context.Context) (*models.Question, error) {
+	// Count documents
+	docs, err := client.Collection("questions").Documents(ctx).GetAll()
+	if err != nil || len(docs) == 0 {
+		log.Fatalf("No documents found: %v", err)
+	}
+
+	// Generate a random offset
+	randomOffset := rand.Intn(len(docs))
+
+	// Retrieve the document at the random offset
+	doc := docs[randomOffset]
+	var question models.Question
+	if err := doc.DataTo(&question); err != nil {
+		return nil, err
+
+	}
+	question.DocRefID = doc.Ref.ID
+
+	return &question, nil
+}