package main

import "fmt"

type Category int

const (
	Electronics Category = iota
	Groceries
	Clothes
)

func (c Category) String() string {
	switch c {
	case Electronics:
		return "Electronics"
	case Groceries:
		return "Groceries"
	case Clothes:
		return "Clothes"
	default:
		return "Unknown"
	}
}

// Struct for product details
type Product struct {
	Name     string
	Price    float64
	Quantity int
	Category Category
}

// Add a new product to the inventory
func addProduct(inventory *[]Product, name string, price float64, quantity int, category Category) {
	// Check if the product already exists in the inventory
	for _, product := range *inventory {
		if product.Name == name {
			fmt.Println("Product already exists.")
			return
		}
	}
	// Add the new product
	*inventory = append(*inventory, Product{
		Name:     name,
		Price:    price,
		Quantity: quantity,
		Category: category,
	})
	fmt.Printf("Added product: %s\n", name)
}

// Remove a product from the inventory
func removeProduct(inventory *[]Product, name string) {
	for i, product := range *inventory {
		if product.Name == name {
			*inventory = append((*inventory)[:i], (*inventory)[i+1:]...)
			fmt.Printf("Removed product: %s\n", name)
			return
		}
	}
	fmt.Println("Product not found.")
}

// Update the quantity of a product
func updateQuantity(inventory *[]Product, name string, newQuantity int) {
	for i, product := range *inventory {
		if product.Name == name {
			(*inventory)[i].Quantity = newQuantity
			fmt.Printf("Updated quantity for %s: New Quantity = %d\n", name, newQuantity)
			return
		}
	}
	fmt.Println("Product not found.")
}

// Display the inventory
func displayInventory(inventory []Product) {
	fmt.Println("Inventory:")
	for _, product := range inventory {
		fmt.Printf("%s - %s (Price: $%.2f, Quantity: %d)\n",
			product.Name, product.Category, product.Price, product.Quantity)
	}
}

func main() {
	// Initialize inventory
	inventory := []Product{
		{Name: "Laptop", Price: 1000, Quantity: 5, Category: Electronics},
		{Name: "Apples", Price: 2, Quantity: 50, Category: Groceries},
		{Name: "T-shirt", Price: 10, Quantity: 20, Category: Clothes},
	}

	// Display initial inventory
	displayInventory(inventory)

	// Add a new product
	addProduct(&inventory, "Phone", 800, 10, Electronics)

	// Display updated inventory
	displayInventory(inventory)

	// Update the quantity of an existing product
	updateQuantity(&inventory, "Apples", 30)

	// Remove a product
	removeProduct(&inventory, "T-shirt")

	// Display final inventory
	displayInventory(inventory)
}