using AsbCloudApp.Data;
using AsbCloudApp.Services;
using AsbCloudDb.Model;
using AsbCloudInfrastructure.Services.Cache;
using Mapster;
using Microsoft.EntityFrameworkCore;
using System;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;

namespace AsbCloudInfrastructure.Services
{
    public class _CachedCrudService<Tdto, TModel> : ICachedCrudService<Tdto>
        where TModel : class, AsbCloudDb.Model.IId
        where Tdto : AsbCloudApp.Data.IId
    {
        private readonly CacheTable<TModel> cache;

        public _CachedCrudService(IAsbCloudDbContext db, Cache.CacheDb cacheDb)
        {
            cache = cacheDb.GetCachedTable<TModel>((DbContext)db);
        }

        public virtual async Task<PaginationContainer<Tdto>> GetAsync(int skip = 0, int take = 32, CancellationToken token = default)
        {
            var count = cache.Count();
            var result = new PaginationContainer<Tdto> { Skip = skip, Take = take, Count = count };
            if (count <= skip)
                return result;

            var items = await cache.WhereAsync(token).ConfigureAwait(false);

            result.Items.AddRange(items.OrderBy(i => i.Id).Skip(skip).Take(take).Select(i => Convert(i)));

            return result;
        }

        public virtual Task<Tdto> GetAsync(int id, CancellationToken token = default)
        {
            throw new NotImplementedException();
        }

        public virtual Tdto Convert(TModel src) => src.Adapt<Tdto>();

        public virtual TModel Convert(Tdto src) => src.Adapt<TModel>();
    }
}