using LiteCharms.Features.Shop.Postgres;

namespace LiteCharms.Features.ShoppingCarts.Commands.Handlers;

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

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

            if (await context.ShoppingCartItems.CountAsync(i => i.ShoppingCartId == request.ShoppingCartId, cancellationToken) == 0)
                return Result.Ok();

            var cartItems = await context.ShoppingCartItems.Where(i => i.ShoppingCartId == request.ShoppingCartId).ToListAsync(cancellationToken);

            context.RemoveRange(cartItems);

            return await context.SaveChangesAsync(cancellationToken) > 0
                ? Result.Ok()
                : Result.Fail($"Could not empty cart with id {request.ShoppingCartId}");
        }
		catch (Exception ex)
		{
            return Result.Fail(new Error(ex.Message).CausedBy(ex));
        }
    }
}