using Infrastructure.Attribute;
using Infrastructure.Extensions;
using ZR.LiveForum.Model.Liveforum.Dto;
using ZR.LiveForum.Model.Liveforum;
using ZR.Repository;
using ZR.Service.Liveforum.ILiveforumService;

namespace ZR.Service.Liveforum
{
    /// <summary>
    /// 关注记录Service业务层处理
    /// </summary>
    [AppService(ServiceType = typeof(IT_FollowsService), ServiceLifetime = LifeTime.Transient)]
    public class T_FollowsService : BaseService<T_Follows>, IT_FollowsService
    {
        /// <summary>
        /// 查询关注记录列表
        /// </summary>
        /// <param name="parm"></param>
        /// <returns></returns>
        public PagedInfo<T_FollowsDto> GetList(T_FollowsQueryDto parm)
        {
            var predicate = QueryExp(parm);

            var response = Queryable()
                //.OrderBy("Id desc")
                .Where(predicate.ToExpression())
                .ToPage<T_Follows, T_FollowsDto>(parm);

            return response;
        }


        /// <summary>
        /// 获取详情
        /// </summary>
        /// <param name="Id"></param>
        /// <returns></returns>
        public T_Follows GetInfo(long Id)
        {
            var response = Queryable()
                .Where(x => x.Id == Id)
                .First();

            return response;
        }

        /// <summary>
        /// 添加关注记录
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public T_Follows AddT_Follows(T_Follows model)
        {
            return Insertable(model).ExecuteReturnEntity();
        }

        /// <summary>
        /// 修改关注记录
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public int UpdateT_Follows(T_Follows model)
        {
            return Update(model, true);
        }

        /// <summary>
        /// 导出关注记录
        /// </summary>
        /// <param name="parm"></param>
        /// <returns></returns>
        public PagedInfo<T_FollowsDto> ExportList(T_FollowsQueryDto parm)
        {
            parm.PageNum = 1;
            parm.PageSize = 100000;
            var predicate = QueryExp(parm);

            var response = Queryable()
                .Where(predicate.ToExpression())
                .Select((it) => new T_FollowsDto()
                {
                }, true)
                .ToPage(parm);

            return response;
        }

        /// <summary>
        /// 查询导出表达式
        /// </summary>
        /// <param name="parm"></param>
        /// <returns></returns>
        private static Expressionable<T_Follows> QueryExp(T_FollowsQueryDto parm)
        {
            var predicate = Expressionable.Create<T_Follows>();

            predicate = predicate.AndIF(parm.FollowerId != null, it => it.FollowerId == parm.FollowerId);
            predicate = predicate.AndIF(parm.FollowedUserId != null, it => it.FollowedUserId == parm.FollowedUserId);
            return predicate;
        }
    }
}