using LiteCharms.Features.Shop.Postgres;

namespace LiteCharms.Features.CartPackages.Commands.Handlers;

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

            if (await context.Packages.AnyAsync(p => p.Name == request.Name, cancellationToken))
                return Result.Fail($"A package by the same name already exists: {request.Name}");

            var package = await context.Packages.FirstOrDefaultAsync(p => p.Id == request.PackageId, cancellationToken);

            if (package is null)
                return Result.Fail($"Could not find package by id {request.PackageId}");

            package.Name = request.Name;
            package.Description = request.Description;

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