/**
 * POST /api/orders/confirm/[id]
 *
 * Confirm an order after mock payment
 *
 * Security:
 * - Requires authentication
 * - Users can only confirm their own orders
 * - Order must be in 'pending' status
 *
 * Behavior:
 * - Updates order status: 'pending' → 'completed'
 * - Stores completion timestamp
 * - Clears user's cart
 * - Returns order details
 *
 * Response:
 * {
 *   success: true
 *   order: Order
 *   message: string
 * }
 */

import { eq, and } from 'drizzle-orm'
import { orders, cartItems } from '../../../database/schema'

export default defineEventHandler(async (event) => {
  // Require authentication
  const { user } = await requireUserSession(event)

  // Get order ID from URL parameter
  const orderId = getRouterParam(event, 'id')

  if (!orderId) {
    throw createError({
      statusCode: 400,
      statusMessage: 'Order ID is required',
    })
  }

  const db = useDatabase()

  // Fetch order
  const order = await db.query.orders.findFirst({
    where: and(eq(orders.id, orderId), eq(orders.userId, user.id)),
  })

  if (!order) {
    throw createError({
      statusCode: 404,
      statusMessage: 'Order not found',
    })
  }

  // Validate order status
  if (order.status !== 'pending') {
    throw createError({
      statusCode: 400,
      statusMessage: `Order cannot be confirmed. Current status: ${order.status}`,
    })
  }

  // Update order status to completed
  const [updatedOrder] = await db
    .update(orders)
    .set({
      status: 'completed',
      paymentCompletedAt: new Date(),
      paymentId: `MOCK-${Date.now()}`, // Mock payment ID
      updatedAt: new Date(),
    })
    .where(eq(orders.id, orderId))
    .returning()

  // Clear user's cart
  const cart = await getOrCreateCart(event)
  await db.delete(cartItems).where(eq(cartItems.cartId, cart.id))

  return {
    success: true,
    order: updatedOrder,
    message: 'Bestellung erfolgreich bestätigt',
  }
})