import fs from 'fs'
import path from 'path'

const DATA_DIR = path.join(process.cwd(), 'data')
const CART_FILE_PATH = path.join(DATA_DIR, 'cart.json')

export interface CartItem {
  id: number
  title: string
  price: number
  quantity: number
}

const ensureDataDir = () => {
  if (!fs.existsSync(DATA_DIR)) {
    fs.mkdirSync(DATA_DIR, { recursive: true })
  }
}

export const saveCart = (cartItems: CartItem[]): void => {
  ensureDataDir()
  const cartData = JSON.stringify(cartItems, null, 2)
  fs.writeFileSync(CART_FILE_PATH, cartData)
}

export const getCart = (): CartItem[] => {
  ensureDataDir()
  if (!fs.existsSync(CART_FILE_PATH)) {
    return []
  }
  const cartData = fs.readFileSync(CART_FILE_PATH, 'utf-8')
  return JSON.parse(cartData)
}

export const clearCart = (): void => {
  ensureDataDir()
  fs.writeFileSync(CART_FILE_PATH, '[]')
}