using LiteCharms.Infrastructure.Database;

namespace LiteCharms.Features.CartPackages.Commands.Handlers;

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

            if (!await context.Packages.AnyAsync(p => p.Id == request.PackageId, cancellationToken))
                return Result.Fail($"Could not find package by ID {request.PackageId}");

            var item = await context.PackageItems.FirstOrDefaultAsync(p => p.Id == request.PackageItemId && p.PackageId == request.PackageId, cancellationToken);

            if(item is null)
                return Result.Fail($"Product item {request.PackageItemId} is already added to this package {request.PackageId}");

            context.PackageItems.Remove(item);

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