using AsbCloudApp.Services;
using AsbCloudDb.Model;
using Mapster;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Caching.Memory;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;

namespace AsbCloudInfrastructure.Repository;


/// <summary>
/// CRUD сервис с кешем в оперативке
/// </summary>
/// <typeparam name="TDto"></typeparam>
/// <typeparam name="TEntity"></typeparam>
public class CrudCacheRepositoryBase<TDto, TEntity> : CacheBase<TEntity>, ICrudRepository<TDto>
    where TDto : AsbCloudApp.Data.IId
    where TEntity : class, IId
{
    protected int KeySelector(TEntity entity) => entity.Id;
    protected readonly ICrudRepository<TDto> crudServiceBase;

    public CrudCacheRepositoryBase(IAsbCloudDbContext dbContext, IMemoryCache memoryCache)
    : base(dbContext, memoryCache)
    {
        crudServiceBase = new CrudRepositoryBase<TDto, TEntity>(dbContext);
    }

    public CrudCacheRepositoryBase(IAsbCloudDbContext dbContext, IMemoryCache memoryCache, Func<DbSet<TEntity>, IQueryable<TEntity>> makeQuery)
    : base(dbContext, memoryCache, makeQuery) 
    {
        crudServiceBase = new CrudRepositoryBase<TDto, TEntity>(dbContext, makeQuery);
    }

    /// <inheritdoc/>
    public virtual async Task<int> InsertAsync(TDto newItem, CancellationToken token)
    {
        var result = await crudServiceBase.InsertAsync(newItem, token);
        if (result > 0)
            DropCache();
        return result;
    }

    /// <inheritdoc/>
    public virtual async Task<int> InsertRangeAsync(IEnumerable<TDto> dtos, CancellationToken token)
    {
        var result = await crudServiceBase.InsertRangeAsync(dtos, token);
        if (result > 0)
            DropCache();
        return result;
    }

    /// <inheritdoc/>
    public virtual async Task<int> UpdateAsync(TDto dto, CancellationToken token)
    {
        var result = await crudServiceBase.UpdateAsync(dto, token);
        if (result > 0)
            DropCache();
        return result;
    }

    /// <inheritdoc/>
    public async Task<IEnumerable<TDto>> GetAllAsync(CancellationToken token)
    {
        var cache = await GetCacheAsync(token);
        var dtos = cache.Select(Convert);
        return dtos;
    }

    /// <summary>
    /// Синхронно получить запись по ИД
    /// </summary>
    /// <param name="id"></param>
    /// <returns></returns>
    public TDto? GetOrDefault(int id)
    {
        var cache = GetCache();
        var cacheItem = cache.FirstOrDefault(d => d.Id == id);
        if (cacheItem is null)
            return default;
        var dto = Convert(cacheItem);
        return dto;
    }

    /// <inheritdoc/>
    public async Task<TDto?> GetOrDefaultAsync(int id, CancellationToken token)
    {
        var cache = await GetCacheAsync(token);
        var cacheItem = cache.FirstOrDefault(d => d.Id == id);
        if (cacheItem is null)
            return default;
        var dto = Convert(cacheItem);
        return dto;
    }

    /// <inheritdoc/>
    public virtual async Task<int> DeleteAsync(int id, CancellationToken token)
    {
        var result = await crudServiceBase.DeleteAsync(id, token);
        if (result > 0)
            DropCache();
        return result;
    }

    protected virtual TDto Convert(TEntity src) => src.Adapt<TDto>();

    protected virtual TEntity Convert(TDto src) => src.Adapt<TEntity>();
}