components/LiteCharms.Features/Shop/Quotes/Commands/Handlers/AssignQuoteToShoppingCartCommandHandler.cs

using LiteCharms.Features.Shop.Postgres;

namespace LiteCharms.Features.Quotes.Commands.Handlers;

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

            var shoppingCart = await context.Orders.FirstOrDefaultAsync(o => o.Id == request.ShoppingCartId, cancellationToken);

            if (shoppingCart is null)
                return Result.Fail(new Error($"ShoppingCart with id {request.ShoppingCartId} not found"));

            if(!await context.Quotes.AnyAsync(q => q.Id == request.QuoteId, cancellationToken))
                return Result.Fail(new Error($"Quote with id {request.QuoteId} not found"));

            shoppingCart.QuoteId = request.QuoteId;

            return await context.SaveChangesAsync(cancellationToken) > 0
                ? Result.Ok()
                : Result.Fail(new Error("Failed to assign quote to shopping cart"));
        }
		catch (Exception ex)
		{
            return Result.Fail(new Error(ex.Message).CausedBy(ex));
        }
    }
}