/**
 * GET /api/cart
 *
 * Get the current user's shopping cart with all items
 *
 * Features:
 * - Returns cart for authenticated users (by userId)
 * - Returns cart for guest users (by sessionId)
 * - Automatically removes unavailable products (inactive or out of stock)
 * - Calculates totals and subtotals
 * - Returns list of removed items if any were auto-cleaned
 *
 * Response:
 * {
 *   cart: { id, userId, sessionId, createdAt, updatedAt },
 *   items: [{ id, product, quantity, subtotal, addedAt }],
 *   total: number,
 *   itemCount: number,
 *   removedItems?: string[] // Names of removed products
 * }
 */

export default defineEventHandler(async (event) => {
  try {
    // Get or create cart for current user/session
    const cart = await getOrCreateCart(event)

    // Get cart with items (auto-cleans unavailable products)
    const cartSummary = await getCartWithItems(cart.id)

    return cartSummary
  } catch (error) {
    // Log error for debugging
    console.error('Error fetching cart:', error)

    // Return empty cart on error
    return {
      cart: null,
      items: [],
      total: 0,
      itemCount: 0,
    }
  }
})