using LangGuan.Command.Model;
using LangGuan.Command.Model.EntityModel;
using Microsoft.Extensions.Configuration;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Threading.Tasks;

namespace LangGuan.Services
{
    /// <summary>
    /// 
    /// </summary>
    public class AlertService : BaseService<Alert>
    {
        /// <summary>
        /// 
        /// </summary>
        /// <param name="config"></param>
        public AlertService(IConfiguration config) : base(config, nameof(Alert))
        {
        }
        /// <summary>
        /// 取前20
        /// </summary>
        /// <param name="top"></param>
        /// <returns></returns>
        public async Task<object> GetToplist(int top = 20)
        {
            Expression<Func<Alert, bool>> exp = num => true;
            var query = await base.GetListWithExp(exp);
            var reslut = query.OrderByDescending(s => s.CreateDateTime).Take(top)
                .Select(s => new { s.Id, s.NickName, s.content, }).ToList();
            if (reslut.Count > 0)
            {
                return reslut;
            }
            return null;
        }
        /// <summary>
        ///新加一条数据
        /// </summary>
        /// <param name="alert"></param>
        /// <returns></returns>
        public async Task<bool> Add(Alert alert)
        {
            await base.CreateAsync(alert);
            return true;
        }
        /// <summary>
        /// 分页数据
        /// </summary>
        /// <param name="request"></param>
        /// <returns></returns>
        public async Task<ApiResult> GetList(RqeustPaging request)
        {
            request.pageSize = request.pageSize == 0 ? 10 : request.pageSize;
            Expression<Func<Alert, bool>> exp = num => true;
            var query = await base.GetListWithExp(exp);
            var total = query.Count();
            var items = query.OrderByDescending(s => s.CreateDateTime)
                .Skip(request.pageSize * (request.current - 1)).Take(request.pageSize)
                .Select(s => new
                {
                    s.Id,
                    s.deviceId,
                    s.NickName,
                    s.content,
                    CreateDateTime = s.CreateDateTime
                }).ToList();
            return new ApiResult()
            {
                code = 0,
                data = new { total = total, items = items }
            };
        }
    }
}