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>
    /// 帖子图片列表Service业务层处理
    /// </summary>
    [AppService(ServiceType = typeof(IT_PostImagesService), ServiceLifetime = LifeTime.Transient)]
    public class T_PostImagesService : BaseService<T_PostImages>, IT_PostImagesService
    {
        /// <summary>
        /// 查询帖子图片列表列表
        /// </summary>
        /// <param name="parm"></param>
        /// <returns></returns>
        public PagedInfo<T_PostImagesDto> GetList(T_PostImagesQueryDto parm)
        {
            var predicate = QueryExp(parm);

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

            return response;
        }


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

            return response;
        }

        /// <summary>
        /// 添加帖子图片列表
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public T_PostImages AddT_PostImages(T_PostImages model)
        {
            return Insertable(model).ExecuteReturnEntity();
        }

        /// <summary>
        /// 修改帖子图片列表
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public int UpdateT_PostImages(T_PostImages model)
        {
            return Update(model, true, "修改帖子图片列表");
        }

        /// <summary>
        /// 导出帖子图片列表
        /// </summary>
        /// <param name="parm"></param>
        /// <returns></returns>
        public PagedInfo<T_PostImagesDto> ExportList(T_PostImagesQueryDto parm)
        {
            parm.PageNum = 1;
            parm.PageSize = 100000;
            var predicate = QueryExp(parm);

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

            return response;
        }

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

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