using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Threading.Tasks;
using Microsoft.EntityFrameworkCore;
using Hncore.Infrastructure.Data;
using Hncore.Infrastructure.DDD;
using Hncore.Infrastructure.EntitiesExtension;

namespace Hncore.Infrastructure.EF
{
    public static class DbSetExtension
    {
        public static TEntity GetOne<TEntity>(this DbSet<TEntity> dbSet, Expression<Func<TEntity, bool>> exp)
            where TEntity : class
        {
            return dbSet.AsNoTracking().FirstOrDefault(exp);
        }

        public static Task<TEntity> GetOneAsync<TEntity>(this DbSet<TEntity> dbSet,
            Expression<Func<TEntity, bool>> exp) where TEntity : class
        {
            return dbSet.AsNoTracking().FirstOrDefaultAsync(exp);
        }

        public static PageData<TEntity> GetList<TEntity, TId>(this DbSet<TEntity> dbSet,
            Expression<Func<TEntity, bool>> exp, int pagesize, int pageindex, bool istotal)
            where TEntity : class, IEntity<TId>
        {
            return dbSet.AsNoTracking()
                .Where(exp)
                .OrderByDescending(t => t.Id)
                .ListPager(pagesize, pageindex, istotal);
        }

        public static Task<PageData<TEntity>> GetListAsync<TEntity>(this DbSet<TEntity> dbSet,
            Expression<Func<TEntity, bool>> exp,  int pagesize, int pageindex, bool istotal)
            where TEntity : class
        {
            return dbSet.AsNoTracking()
                .Where(exp)               
                .ListPagerAsync(pagesize, pageindex, istotal);
        }

        public static List<TEntity> GetList<TEntity>(this DbSet<TEntity> dbSet, Expression<Func<TEntity, bool>> exp)
            where TEntity : class, IEntity
        {
            return dbSet.AsNoTracking()
                .Where(exp)
                .ToList();
        }

        public static Task<List<TEntity>> GetListAsync<TEntity>(this DbSet<TEntity> dbSet,
            Expression<Func<TEntity, bool>> exp)
            where TEntity : class, IEntity
        {
            return dbSet.AsNoTracking()
                .Where(exp)
                .ToListAsync();
        }

        public static IQueryable<TEntity> GetListQueryable<TEntity>(this DbSet<TEntity> dbSet,
            Expression<Func<TEntity, bool>> exp)
            where TEntity : class, IEntity
        {
            return dbSet.AsNoTracking()
                .Where(exp);
        }

        public static bool Exists<TEntity>(this DbSet<TEntity> dbSet, Expression<Func<TEntity, bool>> exp)
            where TEntity : class, IEntity
        {
            return dbSet.AsNoTracking()
                .Any(exp);
        }

        public static Task<bool> ExistsAsync<TEntity>(this DbSet<TEntity> dbSet,
            Expression<Func<TEntity, bool>> exp)
            where TEntity : class, IEntity
        {
            return dbSet.AsNoTracking()
                .AnyAsync(exp);
        }

        public static List<TEntity> TopN<TEntity>(this DbSet<TEntity> dbSet,
            Expression<Func<TEntity, bool>> condition, int topN)
            where TEntity : class, IEntity
        {
            return dbSet.AsNoTracking()
                .Where(condition)
                .TopN(topN)
                .ToList();
        }

        public static Task<List<TEntity>> TopNAsync<TEntity>(this DbSet<TEntity> dbSet,
            Expression<Func<TEntity, bool>> condition, int topN)
            where TEntity : class, IEntity
        {
            return dbSet.AsNoTracking()
                .Where(condition)
                .TopN(topN)
                .ToListAsync();
        }

        public static IQueryable<TEntity> GetQueryable<TEntity>(this DbSet<TEntity> dbSet) where TEntity : class
        {
            return dbSet.AsNoTracking();
        }

        public static TEntity FindById<TEntity>(this DbSet<TEntity> dbSet,object id) where TEntity : class
        {
            return dbSet.Find(id);
        }

        public static Task<TEntity> FindByIdAsync<TEntity>(this DbSet<TEntity> dbSet, object id) where TEntity : class
        {
            return dbSet.FindAsync(id);
        }

    }
}