using DW5S.Entity;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Caching.Memory;
using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DW5S.Repostory
{
    /// <summary>
    /// 双行根星历仓储
    /// </summary>
    public class XlRepository : Repository<XlInfo, int>
    {
        /// <summary>
        /// 
        /// </summary>
        /// <param name="ctx"></param>
        public XlRepository(SqliteContext ctx)
            : base(ctx)
        {
        }

        /// <summary>
        /// 获取双行根数总条数
        /// </summary>
        /// <param name="satCode"></param>
        /// <returns></returns>
        public async Task<int> GetCount(int? satCode)
        {
            var queryable = base.dbSet.AsQueryable();
            if (satCode != null)
                queryable = queryable.Where(p => p.SatCode == satCode);
            var count = await queryable.CountAsync();
            return count;
        }

        public async Task<IEnumerable<SatInfo>> GetAllSat()
        {
            var list = IocContainer.Cache.Get<IEnumerable<SatInfo>>(CacheKeys.AllXlSat);
            if (list != null)
            {
                return list;
            }
            var data = await dbSet.GroupBy(p => p.SatCode).Select(p => p.FirstOrDefault()).ToListAsync();
            var sats = data.Select(p => new SatInfo()
            {
                SatCode = p.SatCode,
                SatName = p.SatName,
                SatLon = p.Lon,
            }).ToList();
            IocContainer.Cache.Set(CacheKeys.AllXlSat, sats, TimeSpan.FromDays(1));
            return sats;
        }

        /// <summary>
        /// 获取数据库双行根数
        /// </summary>
        /// <param name="currentPage">当前页(从1开始)</param>
        /// <param name="pageSize">每页显示的条数</param>
        /// <param name="satCode">卫星编号</param>
        /// <returns></returns>
        public async Task<List<XlInfo>> GetPageAsync(int currentPage, int pageSize, int? satCode)
        {
            try
            {
                int skip = (currentPage - 1) * pageSize;
                var queryable = base.dbSet.AsQueryable();
                if (satCode != null)
                    queryable = queryable.Where(p => p.SatCode == satCode);
                var res = await queryable.OrderByDescending(p => p.TimeUTC)
                    .ThenByDescending(p => p.Lon).Skip(skip).Take(pageSize).ToListAsync();
                return res;
            }
            catch (Exception ex)
            {
                throw new Exception("分页星历信息查询异常", ex);
            }
        }

        /// <summary>
        /// 获取某个星某个时刻最近的双行根
        /// </summary>
        /// <param name="satCode">卫星编号</param>
        /// <param name="sigTime">时刻</param>
        /// <returns></returns>
        public async Task<XlInfo> GetLatestAsync(int satCode, DateTime sigTime)
        {
            try
            {
                var max = await dbSet.Where(p => p.SatCode == satCode && p.TimeUTC >= sigTime)
                    .OrderBy(p => p.TimeUTC).FirstOrDefaultAsync();
                var min = await dbSet.Where(p => p.SatCode == satCode && p.TimeUTC <= sigTime)
                    .OrderByDescending(p => p.TimeUTC).FirstOrDefaultAsync();

                if (max == null && min == null)
                {
                    throw new Exception($"系统缺少编号{satCode}的卫星星历!");
                }
                else
                {
                    XlInfo xlInfo = null;
                    if (max != null && min == null)
                    {
                        xlInfo = max;
                    }
                    else if (max == null && min != null)
                    {
                        xlInfo = min;
                    }
                    else
                    {
                        var val1 = Math.Abs((max.TimeUTC - sigTime).TotalSeconds);
                        var val2 = Math.Abs((min.TimeUTC - sigTime).TotalSeconds);
                        if (val1 < val2)
                            xlInfo = max;
                        else
                            xlInfo = min;
                    }
                    int days = AppConfigHelper.Get("XlWarningDays", 5);
                    if (Math.Abs((sigTime - xlInfo.TimeUTC).TotalDays) > days)
                    {
                        IocContainer.Logger.Warning($"编号{satCode}卫星TLE星历(发布时刻:{xlInfo.TimeUTC:yyyyMMdd})和信号时刻({sigTime:yyyyMMdd})相差过大");
                    }
                    IocContainer.Logger.Information($"卫星{satCode}使用发布时刻为{xlInfo.TimeUTC:yyyyMMddHHmmss}的星历进行推算");
                    return xlInfo;
                }
            }
            catch (Exception ex)
            {
                throw new Exception($"获取卫星[{satCode}]--{sigTime:yyyyMMddHHmmss}时刻附近的双行根数出错!", ex);
            }
        }
    }
}