using UnityEditor;

[InitializeOnLoad]
public static class SpriteAtlasAutoEnable
{
    private const string cEditorPrefSpriteAtlasAutoEnable = "SpriteAtlasAutoEnable.AutoEnable";
    private const string menuName = "Tools/SpriteAtlas AutoEnable/Enabled";

    public static bool AutoEnable
    {
        get => EditorPrefs.GetBool(cEditorPrefSpriteAtlasAutoEnable, true);
        set
        {
            EditorPrefs.SetBool(cEditorPrefSpriteAtlasAutoEnable, value);
            if (value)
                EditorSettings.spritePackerMode = EditorApplication.isPlayingOrWillChangePlaymode ? SpritePackerMode.SpriteAtlasV2 : SpritePackerMode.SpriteAtlasV2Build;

            Menu.SetChecked(menuName, value);
        }
    }

    static SpriteAtlasAutoEnable()
    {
        EditorApplication.playModeStateChanged += OnEnterPlayMode;
        if (AutoEnable)
            EditorSettings.spritePackerMode = EditorApplication.isPlayingOrWillChangePlaymode ? SpritePackerMode.SpriteAtlasV2 : SpritePackerMode.SpriteAtlasV2Build;

        Menu.SetChecked(menuName, AutoEnable);
    }

    private static void OnEnterPlayMode(PlayModeStateChange obj)
    {
        if (!AutoEnable)
            return;

        EditorSettings.spritePackerMode = obj switch
        {
            PlayModeStateChange.ExitingEditMode => SpritePackerMode.SpriteAtlasV2,
            PlayModeStateChange.ExitingPlayMode => SpritePackerMode.SpriteAtlasV2Build,
            _ => EditorSettings.spritePackerMode
        };
    }

    [MenuItem(menuName)]
    private static void ToggleEnabled()
    {
        AutoEnable = !AutoEnable;
        Menu.SetChecked(menuName, AutoEnable);
    }
}