using System;
using System.Reflection;
using UnityEditor;
using UnityEngine;
using Object = UnityEngine.Object;

[InitializeOnLoad]
public static class FixResolutionScale
{
    static FixResolutionScale()
    {
        EditorApplication.playModeStateChanged += OnPlayStateChanged;
        SetGameViewScale();
    }

    private static void OnPlayStateChanged(PlayModeStateChange playModeStateChange)
    {
        SetGameViewScale();
    }

    private static void SetGameViewScale()
    {
        Type gameViewType = GetGameViewType();
        EditorWindow gameViewWindow = GetGameViewWindow(gameViewType);

        if (gameViewWindow == null)
        {
            Debug.LogError("GameView is null!");
            return;
        }

        var defScaleField = gameViewType.GetField("m_defaultScale", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);

        //whatever scale you want when you click on play
        float defaultScale = 0.1f;

        var areaField = gameViewType.GetField("m_ZoomArea", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
        var areaObj = areaField.GetValue(gameViewWindow);

        var scaleField = areaObj.GetType().GetField("m_Scale", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
        scaleField.SetValue(areaObj, new Vector2(defaultScale, defaultScale));
    }

    private static Type GetGameViewType()
    {
        Assembly unityEditorAssembly = typeof(EditorWindow).Assembly;
        Type gameViewType = unityEditorAssembly.GetType("UnityEditor.GameView");
        return gameViewType;
    }

    private static EditorWindow GetGameViewWindow(Type gameViewType)
    {
        Object[] obj = Resources.FindObjectsOfTypeAll(gameViewType);
        if (obj.Length > 0)
        {
            return obj[0] as EditorWindow;
        }
        return null;
    }
}