using System;
using PhxhSDK;
using Framework;

public class CrossDayChecker : Singlenton<CrossDayChecker>, IUpdatable, IInitable
{
    // 检查时间点
    private TimeSpan checkPointTime = new TimeSpan(5, 0, 0);

    // 记录上次检查的时间
    private DateTime lastCheckTime;

    public void SetCheckTime(TimeSpan checkTime)
    {
        checkPointTime = checkTime;
    }

    public void Update(float deltaTime)
    {
        DateTime now = DateTime.Now;

        // 检测跨天
        if (HasCrossedDay(lastCheckTime, now))
        {
            DebugUtil.Log("跨天了！");
            EventManager.Instance.Send(EventManager.EventName.CrossDay);
        }

        // 检测跨周
        if (HasCrossedWeek(lastCheckTime, now))
        {
            DebugUtil.Log("跨周了！");
            EventManager.Instance.Send(EventManager.EventName.CrossWeek);
        }

        // 检测跨月
        if (HasCrossedMonth(lastCheckTime, now))
        {
            DebugUtil.Log("跨月了！");
            EventManager.Instance.Send(EventManager.EventName.CrossMonth);
        }

        // 更新 lastCheckTime
        lastCheckTime = now;
    }

    public void Init()
    {
        lastCheckTime = DateTime.Now;
    }

    public void Release()
    {
    }

    /// <summary>
    /// 检测是否跨天
    /// </summary>
    private bool HasCrossedDay(DateTime previousTime, DateTime currentTime)
    {
        var currentCrossTime = GetCrossTime(currentTime);
        return currentTime >= currentCrossTime && previousTime < currentCrossTime;
    }

    /// <summary>
    /// 检测是否跨周
    /// </summary>
    private bool HasCrossedWeek(DateTime previousTime, DateTime currentTime)
    {
        var previousCrossTime = GetCrossTime(previousTime).StartOfWeek();
        var currentCrossTime = GetCrossTime(currentTime).StartOfWeek();

        return currentCrossTime > previousCrossTime && currentTime >= currentCrossTime;
    }

    /// <summary>
    /// 检测是否跨月
    /// </summary>
    private bool HasCrossedMonth(DateTime previousTime, DateTime currentTime)
    {
        var previousCrossTime = GetCrossTime(previousTime).StartOfMonth();
        var currentCrossTime = GetCrossTime(currentTime).StartOfMonth();

        return currentCrossTime > previousCrossTime && currentTime >= currentCrossTime;
    }

    /// <summary>
    /// 获取指定时间的检查点时间
    /// </summary>
    private DateTime GetCrossTime(DateTime date)
    {
        var crossTime = date.Date + checkPointTime;
        if (date.TimeOfDay < checkPointTime)
        {
            crossTime = crossTime.AddDays(-1);
        }

        return crossTime;
    }
}

/// <summary>
/// DateTime 的扩展方法
/// </summary>
public static class DateTimeExtensions
{
    /// <summary>
    /// 获取指定日期所在周的起始时间（以跨天时间点为准）
    /// </summary>
    public static DateTime StartOfWeek(this DateTime date)
    {
        // 周一为一周的起始
        var diff = (int)date.DayOfWeek - (int)DayOfWeek.Monday;
        if (diff < 0)
        {
            diff += 7;
        }

        return date.AddDays(-diff).Date;
    }

    /// <summary>
    /// 获取指定日期所在月的起始时间（以跨天时间点为准）
    /// </summary>
    public static DateTime StartOfMonth(this DateTime date)
    {
        return new DateTime(date.Year, date.Month, 1);
    }
}