Managing Product Reviews with JavaScript

class ReviewManager {
    constructor() {
        // Initialize an empty object to store product reviews.
        this.products = {};
    }

    addReview(productId, reviewId, reviewText, rating) {
        // Ensure the rating is between 1 and 5.
        if (rating < 1 || rating > 5) {
            return false; // Invalid rating
        }
        // If the product doesn't exist, create a new entry for it.
        if (!this.products[productId]) {
            this.products[productId] = {};
        }
        // Add or update the review for the product.
        this.products[productId][reviewId] = { text: reviewText, rating: rating, flagged: false };
        return true;
    }

    getReview(productId, reviewId) {
        // Check if the product and review exist.
        if (this.products[productId] && this.products[productId][reviewId]) {
            let review = this.products[productId][reviewId];
            // Return the review details.
            return { text: review.text, rating: review.rating, flagged: review.flagged };
        }
        return null;
    }

    deleteReview(productId, reviewId) {
        // Check if the product and review exist.
        if (this.products[productId] && this.products[productId][reviewId]) {
            // Delete the specified review.
            delete this.products[productId][reviewId];
            // If no reviews are left for the product, remove the product entry.
            if (Object.keys(this.products[productId]).length === 0) {
                delete this.products[productId]; // Remove product if no reviews are left
            }
            return true;
        }
        return false;
    }
}

// Instantiate the ReviewManager
const reviewManager = new ReviewManager();

// Adding some reviews
reviewManager.addReview("p1", "r1", "Great product!", 5);
reviewManager.addReview("p1", "r2", "Not bad", 3);

// Testing getReview method
console.log(reviewManager.getReview("p1", "r1"));  // Expected: { text: "Great product!", rating: 5, flagged: false }
console.log(reviewManager.getReview("p1", "r3"));  // Expected: null

// Testing deleteReview method
console.log(reviewManager.deleteReview("p1", "r2"));  // Expected: true
console.log(reviewManager.getReview("p1", "r2"));  // Expected: null