using Shentun.Peis.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Volo.Abp;
using Volo.Abp.Domain.Entities;
using Volo.Abp.Domain.Repositories;

namespace Shentun.Peis
{
    internal class EntityHelper
    {
        /// <summary>
        /// 创建最大显示顺序
        /// </summary>
        /// <typeparam name="TEntity"></typeparam>
        /// <param name="repository"></param>
        /// <returns></returns>
        public static async Task<int> CreateMaxDisplayOrder<TEntity>(IRepository<TEntity> repository) 
            where TEntity: class, IEntity,IDisplayOrder
        {
            int? maxDisplayOrder = await repository.MaxAsync(o => (int?)o.DisplayOrder);
            return (maxDisplayOrder ?? 0) + 1;
        }
        /// <summary>
        /// 检查同名
        /// </summary>
        /// <typeparam name="TEntity"></typeparam>
        /// <typeparam name="TKey"></typeparam>
        /// <param name="repository"></param>
        /// <param name="name"></param>
        /// <param name="updatedEntity"></param>
        /// <returns></returns>
        /// <exception cref="UserFriendlyException"></exception>
        public static async Task CheckSameName<TEntity,TKey>(IRepository<TEntity> repository,string name, TEntity updatedEntity = null)
           where TEntity : class, IEntity<TKey>, IDisplayName
        {
            Check.NotNullOrWhiteSpace(name, nameof(name));
            TEntity existEntity;
            
            if (updatedEntity == null)
            {
                existEntity = await repository.FindAsync(o => o.DisplayName == name);
            }
            else 
            {
                existEntity = await repository.FindAsync(o => o.Id.ToString() != updatedEntity.Id.ToString() && o.DisplayName == name);
            }
           

            if (existEntity != null)
            {
                throw new UserFriendlyException($"名称:'{name}'已存在");
            }
        }
    }
}