using LiteCharms.Features.Shop.Postgres;

namespace LiteCharms.Features.ShoppingCarts.Commands.Handlers;

public class RemoveShoppingCartItemCommandHandler(IDbContextFactory<ShopDbContext> contextFactory) : IRequestHandler<RemoveShoppingCartItemCommand, Result>
{
    public async ValueTask<Result> Handle(RemoveShoppingCartItemCommand request, CancellationToken cancellationToken)
    {
		try
		{
            using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            if (!await context.ProductPrices.AnyAsync(c => c.Id == request.ShoppingCartItemId, cancellationToken))
                return Result.Fail($"Product item could not be found with id {request.ShoppingCartItemId}");

            var cart = await context.ShoppingCarts.FirstOrDefaultAsync(c => c.Id == request.ShoppingCartId, cancellationToken);

            if (cart is null)
                return Result.Fail($"Shopping cart item could not be found with id {request.ShoppingCartId}");

            var item = await context.ShoppingCartItems.FirstOrDefaultAsync(i => i.Id == request.ShoppingCartItemId, cancellationToken);

            if (item is null) return Result.Ok();

            context.ShoppingCartItems.Remove(item);

            return await context.SaveChangesAsync(cancellationToken) > 0
                ? Result.Ok()
                : Result.Fail($"Failed to remove shopping cart item with id {request.ShoppingCartItemId}");
        }
		catch (Exception ex)
		{
            return Result.Fail(new Error(ex.Message).CausedBy(ex));
        }
    }
}