using System;
using System.Collections;
using UnityEngine;

namespace UnitySA.Utility;

[Serializable]
public class FOVZoom
{
	public Camera Camera;

	[HideInInspector]
	public float originalFov;

	public float FOVIncrease = 3f;

	public float TimeToIncrease = 1f;

	public float TimeToDecrease = 1f;

	public AnimationCurve IncreaseCurve;

	public void Setup(Camera camera)
	{
		CheckStatus(camera);
		Camera = camera;
		originalFov = camera.fieldOfView;
	}

	private void CheckStatus(Camera camera)
	{
		if (camera == null)
		{
			throw new Exception("FOVKick camera is null, please supply the camera to the constructor");
		}
		if (IncreaseCurve == null)
		{
			throw new Exception("FOVKick Increase curve is null, please define the curve for the field of view kicks");
		}
	}

	public void ChangeCamera(Camera camera)
	{
		Camera = camera;
	}

	public IEnumerator FOVKickUp()
	{
		float t = Mathf.Abs((Camera.fieldOfView - originalFov) / FOVIncrease);
		while (t < TimeToIncrease)
		{
			Camera.fieldOfView = originalFov + IncreaseCurve.Evaluate(t / TimeToIncrease) * FOVIncrease;
			t += Time.deltaTime;
			yield return new WaitForEndOfFrame();
		}
	}

	public IEnumerator FOVKickDown()
	{
		float t = Mathf.Abs((Camera.fieldOfView - originalFov) / FOVIncrease);
		while (t > 0f)
		{
			Camera.fieldOfView = originalFov + IncreaseCurve.Evaluate(t / TimeToDecrease) * FOVIncrease;
			t -= Time.deltaTime;
			yield return new WaitForEndOfFrame();
		}
		Camera.fieldOfView = originalFov;
	}
}