using System;
using System.Linq;
using Fort23.UTool;
using UnityEngine;

namespace Fort23.Core
{
    public static class TimeHelper
    {
        public static int refreshHour = 0;
        public static readonly long epoch = 0;
        private static readonly DateTime ServerStartTime = new DateTime(2025, 4, 1, 0, 0, 0, DateTimeKind.Utc);
        public static DateTime dtStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));

        public const long OneDay = 86400000;
        public const long Hour = 3600000;
        public const long Minute = 60000;

        private static long _clientFrame;

        public static long clientFrame
        {
            set => _clientFrame = value;
        }


        // 最近一次校准的网络时间戳毫秒
        private static long _startNetworkMs = 0;

        // 最近一次校准时的 Unity 时间
        private static float _lastSyncUnityTime = 0f;

        // 游戏首次启动时间
        private static float _gameStartTime;

        private const int SyncInterval = 300;

        /// <summary>
        /// 是否获取了网络时间
        /// </summary>
        public static bool IsNetworkTimeReady { get; private set; } = false;


        /// <summary>
        /// 必须在游戏启动时调用（异步）
        /// </summary>
        public static async CTask InitNetworkTime()
        {
            // 启动时的 Unity 时间
            _gameStartTime = Time.unscaledTime;

            // 首次同步
            await SyncWithNetwork();

            //每隔五分钟重新同步一次时间
            TimerComponent.Instance.AddTimer(SyncInterval * 1000, null, Int32.MaxValue, () => { SyncWithNetwork(); });
        }


        // 核心：与百度时间同步
        private static async CTask SyncWithNetwork()
        {
            var networkTime = await NetworkTime.GetNetworkTimeAsync();
            if (networkTime.HasValue)
            {
                long networkMs = (long)(networkTime.Value - new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc))
                    .TotalMilliseconds;

                if (!IsNetworkTimeReady)
                {
                    // 首次同步
                    _startNetworkMs = networkMs;
                    _lastSyncUnityTime = Time.unscaledTime;
                    IsNetworkTimeReady = true;
                    LogTool.Log($"首次网络时间同步成功: {networkTime.Value:yyyy-MM-dd HH:mm:ss} UTC");
                }
                else
                {
                    // 定期校准：计算漂移并修正
                    float elapsedUnity = Time.unscaledTime - _lastSyncUnityTime;
                    long expectedMs = _startNetworkMs + (long)(elapsedUnity * 1000);
                    long driftMs = networkMs - expectedMs;

                    if (Mathf.Abs((float)driftMs) > 5000) // 漂移 > 5 秒才修正（避免微小误差）
                    {
                        _startNetworkMs = networkMs;
                        _lastSyncUnityTime = Time.unscaledTime;
                        LogTool.Log($"时间校准: 漂移 {driftMs}ms，已修正");
                    }
                    else
                    {
                        LogTool.Log($"时间校准: 漂移 {driftMs}ms，正常");
                    }
                }
            }
            else
            {
                LogTool.Warning("网络时间校准失败，保持当前时间");
            }
        }


        /// <summary>
        /// 客户端非暂停状态经历的帧数对应的毫秒
        /// </summary>
        /// <returns></returns>
        public static long ClientFrame()
        {
            return _clientFrame;
        }

        /// <summary>
        /// 获取安全的当前时间戳（毫秒）
        /// </summary>
        private static long GetSafeNowMs()
        {
            if (!IsNetworkTimeReady || _startNetworkMs == 0)
                return (long)(DateTime.UtcNow.Ticks / 10000); // 回退

            // Unity运行毫秒（完全不受系统时间影响）
            float elapsedUnity = Time.unscaledTime - _gameStartTime;
            long elapsedMs = (long)(elapsedUnity * 1000);


            return _startNetworkMs + elapsedMs;
        }


        public static long GetServerStartTime()
        {
            return ((ServerStartTime.Ticks - epoch) / 10000) + (8 * 60 * 60 * 1000);
        }

        public static long ClientNowMicroseconds()
        {
            return GetSafeNowMs() * 1000;
        }

        public static long ClientNow()
        {
            return GetSafeNowMs() + (8 * 60 * 60 * 1000); // 东八区
        }

        public static long ClientNowSeconds()
        {
            return ClientNow() / 1000;
        }

        public static DateTime DateTimeNow()
        {
            return DateTimeOffset.FromUnixTimeMilliseconds(ClientNow()).UtcDateTime;
        }

        public static long ServerNow()
        {
            return ClientNow();
        }

        public static long ServerNowSeconds()
        {
            return ClientNowSeconds();
        }


        /// <summary>
        /// 客户端时间（年月日）
        /// </summary>
        /// <param name="timeStamp">当前时间</param>
        /// <returns></returns>
        public static int ClientNowInt(long timeStamp)
        {
            TimeSpan toNow = new TimeSpan(timeStamp * 10000);
            DateTime dateTime = dtStart.Add(toNow);
            int year = dateTime.Year;
            int month = dateTime.Month;
            int day = dateTime.Day;
            int date;
            string smouth = "";
            if (month >= 10)
            {
                smouth = month.ToString();
            }
            else
            {
                smouth = $"0{month}";
            }

            string sday = "";
            if (day >= 10)
            {
                sday = day.ToString();
            }
            else
            {
                sday = $"0{day}";
            }

            if (int.TryParse($"{year}{smouth}{sday}", out date))
            {
                return date;
            }

            return 20201010;
        }

        /// <summary>
        /// 客户端时间（月日时分秒）
        /// </summary>
        /// <param name="timeStamp">当前时间(毫秒)</param>
        /// <returns></returns>
        public static string ToString1(long timeStamp)
        {
            TimeSpan toNow = new TimeSpan(timeStamp * 10000);
            DateTime dateTime = dtStart.Add(toNow);
            string month = String.Empty;
            string day = String.Empty;
            string hour = String.Empty;
            string minute = String.Empty;
            string second = String.Empty;
            if (dateTime.Month >= 10)
            {
                month = dateTime.Month.ToString();
            }
            else
            {
                month = $"0{dateTime.Month}";
            }

            if (dateTime.Day >= 10)
            {
                day = dateTime.Day.ToString();
            }
            else
            {
                day = $"0{dateTime.Day}";
            }

            if (dateTime.Hour >= 10)
            {
                hour = dateTime.Hour.ToString();
            }
            else
            {
                hour = $"0{dateTime.Hour}";
            }

            if (dateTime.Minute >= 10)
            {
                minute = dateTime.Minute.ToString();
            }
            else
            {
                minute = $"0{dateTime.Minute}";
            }

            if (dateTime.Second >= 10)
            {
                second = dateTime.Second.ToString();
            }
            else
            {
                second = $"0{dateTime.Second}";
            }

            string result = $"{month}月{day}日{hour}：{minute}：{second}";
            return result;
        }

        /// <summary>
        /// 判断法定工作日和节假日
        /// </summary>
        /// <param name="dt">时间</param>
        /// <returns>0上班，1不需要上班的周末（也包括节假日），2法定节假日</returns>
        public static int IsHolidayOrWeekend(DateTime dt)
        {
            //特殊的周末（周末却上班）
            string[] specalWeek2022 = { };
            string[] specalWeek2023 = { "0128", "0129", "0214", "0429", "0430", "0625", "1007", "1008" };

            //法定假日
            string[] holiday2022 = { "1231" };
            string[] holiday2023 =
            {
                "0101", "0102", "0121", "0122", "0123", "0124", "0125", "0126", "0127", "0405", "0501", "0502", "0503",
                "0504", "0505", "0622", "0623",
                "0929", "1002", "1003", "1004", "1005", "1006"
            };

            bool isHoildayOrWeek = false;
            //取年
            string weekYear = dt.Year.ToString();
            //取月日
            string[] weekDate = { dt.ToString("MMdd") };
            //判断周末和周五
            if ((int)dt.DayOfWeek == 0 || (int)dt.DayOfWeek == 6 || (int)dt.DayOfWeek == 5)
            {
                //周末是否需要上班
                switch (weekYear)
                {
                    case "2022":
                        isHoildayOrWeek = specalWeek2022.Intersect(weekDate).Count() == 0;
                        break;
                    case "2023":
                        isHoildayOrWeek = specalWeek2023.Intersect(weekDate).Count() == 0;
                        break;
                }
            }

            if (isHoildayOrWeek)
            {
                return 1;
            }

            //判断法定节假日
            switch (weekYear)
            {
                case "2022":
                    isHoildayOrWeek = holiday2022.Intersect(weekDate).Count() > 0;
                    break;
                case "2023":
                    isHoildayOrWeek = holiday2023.Intersect(weekDate).Count() > 0;
                    break;
            }

            if (isHoildayOrWeek)
            {
                return 2;
            }

            return 0;
        }


        public static long GetBaseRefreshTime(long baseTime, int day = 1)
        {
            DateTime dateTime = DateTimeOffset.FromUnixTimeMilliseconds(baseTime).DateTime;
            int hour = dateTime.Hour;
            DateTime refreshDateTime = new DateTime(dateTime.Year, dateTime.Month, dateTime.Day, refreshHour, 0, 0,
                DateTimeKind.Utc);
            if (hour < refreshHour)
            {
                day -= 1;
            }

            refreshDateTime = refreshDateTime.AddDays(day);
            long refreshTime = new DateTimeOffset(refreshDateTime).ToUnixTimeMilliseconds();
            return refreshTime;
        }
    }
}