using System;
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using System.Runtime.InteropServices.WindowsRuntime;
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using UnityEngine;
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namespace Core.Utilities
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{
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/// <summary>
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/// A timer data model. Consumed/process by the TimedBehaviour
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/// 塔防游戏的基础Timer包装类，设置一个time时间后要引发的操作，然后每一轮Tick这个Timer，触发后Tick返回true
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/// 由调用层进行相应的操作。
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/// </summary>
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public class Timer
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{
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/// <summary>
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/// Event fired on elapsing
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/// </summary>
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readonly Action m_Callback;
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/// <summary>
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/// The time
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/// </summary>
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float m_Time, m_CurrentTime;
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protected static int TIMER_IDSTART = 0;
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protected int mTimerID = 0;
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/// <summary>
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/// Normalized progress of the timer
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/// </summary>
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public float normalizedProgress
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{
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get { return Mathf.Clamp(m_CurrentTime / m_Time, 0f, 1f); }
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}
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public float currentTime
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{
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get { return this.m_CurrentTime; }
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}
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public int timerID
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{
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get { return this.mTimerID; }
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}
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/// <summary>
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/// Timer constructor
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/// </summary>
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/// <param name="newTime">the time that timer is counting</param>
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/// <param name="onElapsed">the event fired at the end of the timer elapsing</param>
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public Timer(float newTime, Action onElapsed = null)
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{
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SetTime(newTime);
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m_CurrentTime = 0f;
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m_Callback += onElapsed;
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mTimerID = TIMER_IDSTART++;
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}
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/// <summary>
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/// Returns the result of AssessTime
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/// </summary>
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/// <param name="deltaTime">change in time between ticks</param>
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/// <returns>true if the timer has elapsed, false otherwise</returns>
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public virtual bool Tick(float deltaTime)
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{
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return AssessTime(deltaTime);
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}
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/// <summary>
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/// Checks if the time has elapsed and fires the tick event
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/// </summary>
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/// <param name="deltaTime">the change in time between assessments</param>
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/// <returns>true if the timer has elapsed, false otherwise</returns>
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protected bool AssessTime(float deltaTime)
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{
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m_CurrentTime += deltaTime;
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if (m_CurrentTime >= m_Time)
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{
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FireEvent();
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return true;
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}
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return false;
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}
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/// <summary>
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/// Resets the current time to 0
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/// </summary>
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public void Reset()
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{
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m_CurrentTime = 0;
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}
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/// <summary>
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/// Fires the associated timer event
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/// </summary>
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public void FireEvent()
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{
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m_Callback.Invoke();
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}
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/// <summary>
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/// Sets the elapsed time
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/// </summary>
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/// <param name="newTime">sets the time to a new value</param>
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public void SetTime(float newTime)
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{
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m_Time = newTime;
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if (newTime <= 0)
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{
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m_Time = 0.1f;
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}
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}
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}
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}
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