store

import scala.io.StdIn.readInt

class Product(name:String, price: Int, count: Int) { //count shows the intial stock
    var sold: Int = 0; //currently no.of items sold
    def print() = println("Product: " + name + " (" + price + " LKR) : " + getStock());
    def getName() = name; //returns the product name
    def getPrice() = price; //returns the product price
    def getStock() = count - sold; //returns the products current stock
    def decrementStock(qty: Int) = sold += qty; //updates the stock
};

object store {
    var products: Array[Product] = new Array[Product](3); //consist of the products of the market

    def main(args: Array[String]){
        //adding items to the array
        products(0) = new Product("Apple", 10, 3);
        products(1) = new Product("Mango", 30, 2);
        products(2) = new Product("Orange", 40, 1);

        //infinite loop to main menu
        while(true){
            printMainMenu();
            val choice = readInt();

            choice match {
                case 1 => printStock(); //prints the current stock
                case 2 => newCustomer(); //handels the customer actions
                case _ => return; //exit the program whenever a value otherthan 1,2
            };
        }
    }

    //prints the main menu
    def printMainMenu() {
        println("********** Welcome to Store on Reid **********");
        println("Choose an option:");
        println("\t1. Print current stock");
        println("\t2. New customer");
        println("\t3. Exit");

        print("Enter your choice: ");
    }

    //customers menu actions
    def printCustomerMenu() {
        println("The following items are available for you to buy");
        printStock();
        println("Choose an item number to add to cart. Press 0 to complete purchase.");
        print("Enter your choice: ");
    }

    //prints the current stock
    def printStock() {
        var index: Int = 1; //varible to print the index
        println("Item\t\tPrice\t\tQty");
        for(item <- products){ // for each loop on products array
            print(index + ". ");
            print(item.getName() + "\t");
            print(item.getPrice() + " LKR\t\t");
            print(item.getStock() + "\n");
            index = index + 1;
        }
        println("");
    }

    //handles the customer actions
    def newCustomer() {
        var sum: Int = 0; //total of the bill
        var continue: Boolean = true; //variable to break out of the loop
        while(continue){
            printCustomerMenu();
            val choice = readInt(); // 1 2 3
            if(choice > 3 || choice < 1) {
                continue = false;
            } else {
                print("How many do you need? ");
                val qty = readInt();
                var product = products(choice-1); //get the specific product reference
                if(product.getStock() < qty) println("Product doesn't have enough stock");
                else {
                    sum = sum + product.getPrice() * qty;
                    product.decrementStock(qty);
                    println("Product " + product.getName() + " added to cart");
                }
            }
            println("Current Cart Total: " + sum + " LKR");
            println("");
        }
        println("Cart Total: " + sum + " LKR");
        println("Thank you for shopping!");
        println("");
    }
};