using System;
using System.Threading;
using System.Threading.Tasks;
using xCommons.Extensions;
using xDataService.Interfaces;
using xModels.Base;

namespace xDataService.Providers
{
    /// <summary>
    /// Default Guid Key Generator ...
    /// </summary>
    /// <typeparam name="TEntity"></typeparam>

    public class XStringKeyGenerator<TEntity> : XKeyGenerator<TEntity, string>, IXKeyGenerator<TEntity, string>
    where TEntity : XBaseEntity<string>
    {
        private readonly IXSequentialGuid sequentialGuid;

        public XStringKeyGenerator(IXSequentialGuid sequentialGuid = null)
        {
            this.sequentialGuid = sequentialGuid;
        }

        public override async Task<string> GenerateKey(
            IXBaseRepository<TEntity, string> repository,
            CancellationToken cancellationToken = default
        )
        {
            //
            await Task.CompletedTask;

            //
            if (sequentialGuid.IsNull())
            {
                return Guid.NewGuid().ToString();
            }
            else
            {
                return sequentialGuid.Next().ToString();
            }
        }

        public override bool IsEmpty(string id)
        {
            return id.IsNullOrEmpty();
        }
    }
}