using ErrorOr;
using Microsoft.EntityFrameworkCore;
using Musify.Domain.Abstractions;
using Musify.Domain.ValueObjects;

namespace Musify.Application.Shared
{
    public static class OwnershipExtensions
    {
        /// <summary>
        /// Loads an active, tracked entity owned by <paramref name="userId"/>: NotFound when it is missing
        /// or not active, Forbidden when someone else owns it.
        /// </summary>
        public static async Task<ErrorOr<T>> FindOwnedAsync<T>(
            this DbSet<T> set, Guid id, long userId, CancellationToken cancellationToken)
            where T : class, IOwnedEntity, IHasLifeCycle
        {
            var entity = await set.SingleOrDefaultAsync(
                e => e.Id == id && e.LifeCycleStatus == LifeCycleStatus.Active, cancellationToken);

            if (entity == null)
                return AppErrors.NotFound(typeof(T).Name, id);

            return entity.OwnerUserId == userId
                ? entity
                : AppErrors.Forbidden(typeof(T).Name, id);
        }
    }
}