using System;
using Rewired.Utils;
using UnityEngine;
using UnityEngine.UI;

namespace Rewired.UI.ControlMapper
{
	[RequireComponent(typeof(CanvasScalerExt))]
	public class CanvasScalerFitter : MonoBehaviour
	{
		[Serializable]
		private class BreakPoint
		{
			[SerializeField]
			public string name;

			[SerializeField]
			public float screenAspectRatio;

			[SerializeField]
			public Vector2 referenceResolution;
		}

		[SerializeField]
		private BreakPoint[] breakPoints;

		private CanvasScalerExt canvasScaler;

		private int screenWidth;

		private int screenHeight;

		private Action ScreenSizeChanged;

		private void OnEnable()
		{
			canvasScaler = GetComponent<CanvasScalerExt>();
			Update();
			canvasScaler.ForceRefresh();
		}

		private void Update()
		{
			if (Screen.width != screenWidth || Screen.height != screenHeight)
			{
				screenWidth = Screen.width;
				screenHeight = Screen.height;
				UpdateSize();
			}
		}

		private void UpdateSize()
		{
			if (canvasScaler.uiScaleMode != CanvasScaler.ScaleMode.ScaleWithScreenSize || breakPoints == null)
			{
				return;
			}
			float num = (float)Screen.width / (float)Screen.height;
			float num2 = float.PositiveInfinity;
			int num3 = 0;
			for (int i = 0; i < breakPoints.Length; i++)
			{
				float num4 = Mathf.Abs(num - breakPoints[i].screenAspectRatio);
				if ((!(num4 > breakPoints[i].screenAspectRatio) || MathTools.IsNear(breakPoints[i].screenAspectRatio, 0.01f)) && num4 < num2)
				{
					num2 = num4;
					num3 = i;
				}
			}
			canvasScaler.referenceResolution = breakPoints[num3].referenceResolution;
		}
	}
}