Dragon_Crasher_Tutorial/Assets/Gameplay/Scripts/Utilities/DurationTimer/DurationTimer.cs

/*
Script Source: https://coffeebraingames.wordpress.com/2014/10/20/a-generic-duration-timer-class/
*/

using UnityEngine;
 
/**
 * Generic class for implementing timers (specified in seconds)
 */
public class DurationTimer {

    private float polledTime;
    private float durationTime;
 
    /**
     * Constructor with a specified duration time
     */
    public DurationTimer(float durationTime) {
        Reset(durationTime);
    }
 
    /**
     * Updates the timer manually
     */
    public void UpdateTimer() {
        this.polledTime += Time.deltaTime;
    }
 
    /**
     * Resets the timer
     */
    public void Reset() {
        this.polledTime = 0;
    }
 
    /**
     * Resets the timer and assigns a new duration time
     */
    public void Reset(float durationTime) {
        Reset();
        this.durationTime = durationTime;
    }
 
    /**
     * Returns whether or not the timed duration has elapsed
     */
    public bool HasElapsed() {
        return Comparison.TolerantGreaterThanOrEquals(this.polledTime, this.durationTime);
    }
 
    /**
     * Returns the ratio of polled time to duration time. Returned value is 0 to 1 only
     */
    public float GetRatio() {
        if(Comparison.TolerantLesserThanOrEquals(this.durationTime, 0)) {
            // bad duration time value
            // if countdownTime is zero, ratio will be infinity (divide by zero)
            // we just return 1.0 here for safety
            return 1.0f;
        }
 
        float ratio = this.polledTime / this.durationTime;
        return Mathf.Clamp(ratio, 0, 1);
    }
 
    /**
     * Returns the polled time since it started
     */
    public float GetPolledTime() {
        return this.polledTime;
    }
 
    /**
     * Forces the timer to end
     */
    public void EndTimer() {
        this.polledTime = this.durationTime;
    }
 
    /**
     * Returns the durationTime
     */
    public float GetDurationTime() {
        return this.durationTime;
    }
 
}