package inventory

import (
	"context"

	platforminv "git.k6n.net/mats/platform/inventory"
)

// ReservationPolicyAdapter wraps a RedisCartReservationService to satisfy the
// platform/inventory.ReservationPolicy interface. It translates between the
// platform's value types (SKU, LocationID, CartID) and the Redis-level types
// used internally by go-redis-inventory.
type ReservationPolicyAdapter struct {
	inner *RedisCartReservationService
}

// NewReservationPolicyAdapter creates an adapter that satisfies
// platform/inventory.ReservationPolicy by delegating to the Redis-backed
// reservation service.
func NewReservationPolicyAdapter(inner *RedisCartReservationService) *ReservationPolicyAdapter {
	return &ReservationPolicyAdapter{inner: inner}
}

func (a *ReservationPolicyAdapter) Reserve(ctx context.Context, req platforminv.CartReserveRequest) error {
	return a.inner.ReserveForCart(ctx, CartReserveRequest{
		InventoryReference: &InventoryReference{
			SKU:        SKU(req.SKU),
			LocationID: LocationID(req.LocationID),
		},
		CartID:   CartID(req.CartID),
		Quantity: req.Quantity,
		TTL:      req.TTL,
	})
}

func (a *ReservationPolicyAdapter) Release(ctx context.Context, sku platforminv.SKU, locationID platforminv.LocationID, cartID platforminv.CartID) error {
	return a.inner.ReleaseForCart(ctx, SKU(sku), LocationID(locationID), CartID(cartID))
}

func (a *ReservationPolicyAdapter) Available(ctx context.Context, sku platforminv.SKU, locationID platforminv.LocationID) (int64, error) {
	return a.inner.GetAvailableInventory(ctx, SKU(sku), LocationID(locationID))
}