using System;
using UnityEngine;
using System.Collections;
using UnityEngine.Networking;
using Newtonsoft.Json.Linq;

/// <summary>
/// 北京时间管理器 - 获取一次后持续自增
/// </summary>
public class BeijingTimeManager : MonoSingleton<BeijingTimeManager>
{
    [Header("时间状态")]
    [SerializeField] private bool _isTimeSynced = false;
    [SerializeField] private DateTime _currentBeijingTime;
    [SerializeField] private float _timeSinceLastSync;

    /// <summary>
    /// 获取当前北京时间
    /// </summary>
    public DateTime CurrentBeijingTime
    {
        get
        {
            if (_isTimeSynced)
            {
                return _currentBeijingTime.AddSeconds(_timeSinceLastSync);
            }
            return DateTime.Now; // 未同步时返回本地时间
        }
    }

    /// <summary>
    /// 获取时间戳（秒）- 1970-01-01 08:00:00 到现在的秒数
    /// </summary>
    public long CurrentTimestamp
    {
        get
        {
            DateTime beijingTime = CurrentBeijingTime;
            DateTime epoch = new DateTime(1970, 1, 1, 8, 0, 0); // 北京时间起点
            return (long)(beijingTime - epoch).TotalSeconds;
        }
    }

    /// <summary>
    /// 获取时间戳（毫秒）
    /// </summary>
    public long CurrentTimestampMs
    {
        get
        {
            DateTime beijingTime = CurrentBeijingTime;
            DateTime epoch = new DateTime(1970, 1, 1, 8, 0, 0); // 北京时间起点
            return (long)(beijingTime - epoch).TotalMilliseconds;
        }
    }

    public bool IsTimeSynced => _isTimeSynced;
    public event Action<DateTime> OnTimeSynced;

    private void Start()
    {
        SyncBeijingTime();
    }

    private void Update()
    {
        if (_isTimeSynced)
        {
            _timeSinceLastSync += Time.deltaTime;
        }
    }

    /// <summary>
    /// 同步北京时间
    /// </summary>
    public void SyncBeijingTime()
    {
        StartCoroutine(FetchBeijingTime());
    }

    private IEnumerator FetchBeijingTime()
    {
        string[] timeServers = new string[]
        {
        "https://timeapi.io/api/Time/current/zone?timeZone=Asia/Shanghai",
        "http://worldtimeapi.org/api/timezone/Asia/Shanghai",
        "https://quan.suning.com/getSysTime.do"
        };

        foreach (string url in timeServers)
        {
            using (UnityWebRequest request = UnityWebRequest.Get(url + "?_=" + DateTime.Now.Ticks))
            {
                request.timeout = 5;
                yield return request.SendWebRequest();

                if (request.result == UnityWebRequest.Result.Success)
                {
                    string jsonText = request.downloadHandler.text;
                    Debug.Log($"返回原始数据：{jsonText}");

                    if (!jsonText.TrimStart().StartsWith("{"))
                    {
                        Debug.LogWarning("返回的不是 JSON，跳过该源");
                        continue;
                    }

                    try
                    {
                        JObject json = JObject.Parse(jsonText);

                        if (url.Contains("timeapi.io"))
                        {
                          
                            string timeStr = json["dateTime"]?.ToString();
                            Debug.Log(timeStr);
                            if (!string.IsNullOrEmpty(timeStr))
                            {
                                _currentBeijingTime = DateTime.Parse(timeStr);
                                _timeSinceLastSync = 0;
                                _isTimeSynced = true;
                                Debug.Log($"北京时间同步成功：{_currentBeijingTime:yyyy-MM-dd HH:mm:ss}");
                                OnTimeSynced?.Invoke(_currentBeijingTime);
                                yield break;
                            }
                        }
                        else if (url.Contains("worldtimeapi"))
                        {

                            string timeStr = json["datetime"]?.ToString();
                            Debug.Log(timeStr);

                            if (!string.IsNullOrEmpty(timeStr))
                            {
                                _currentBeijingTime = DateTimeOffset.Parse(timeStr)
                                    .ToOffset(TimeSpan.FromHours(8))
                                    .DateTime;
                                _timeSinceLastSync = 0;
                                _isTimeSynced = true;
                                Debug.Log($"北京时间同步成功：{_currentBeijingTime:yyyy-MM-dd HH:mm:ss}");
                                OnTimeSynced?.Invoke(_currentBeijingTime);
                                yield break;
                            }
                        }
                        else if (url.Contains("suning"))
                        {
                            string timeStr = json["sysTime2"]?.ToString();
                            Debug.Log(timeStr);

                            if (!string.IsNullOrEmpty(timeStr))
                            {
                                _currentBeijingTime = DateTime.ParseExact(timeStr, "yyyy-MM-dd HH:mm:ss", null);
                                _timeSinceLastSync = 0;
                                _isTimeSynced = true;
                                Debug.Log($"北京时间同步成功：{_currentBeijingTime:yyyy-MM-dd HH:mm:ss}");
                                OnTimeSynced?.Invoke(_currentBeijingTime);
                                yield break;
                            }
                        }
                    }
                    catch (Exception e)
                    {
                        Debug.LogWarning($"解析失败：{e.Message}");
                        continue;
                    }
                }
            }
        }

        Debug.LogError("所有时间服务器都失败了，使用本地时间");
        _currentBeijingTime = DateTime.Now;
        _isTimeSynced = false;
    }




    /// <summary>
    /// 获取格式化的北京时间
    /// </summary>
    public string GetFormattedTime(string format = "yyyy-MM-dd HH:mm:ss")
    {
        return CurrentBeijingTime.ToString(format);
    }
}