using UnityEngine;
using UnityEditor;
using UnityEditor.SceneManagement;
[CustomEditor(typeof(DirectionalLightSetter))]
public class DirectionalLightEditor : Editor
{
    private DirectionalLightSetter _target;
    private Light _light;

    private Quaternion _lastRotation;
    private Color _lastColor;
    private float _lastAtten;
    private Vector3 _lastSpecularEular;
    
    private void OnEnable()
    {
        _target = (DirectionalLightSetter)target;
        _light = _target.GetComponent<Light>();
        if (_light == null)
            Debug.LogError("Directional Light Setter 上不存在光源组件！");
        else
        {
            _target.SetLight(_light);
            _lastSpecularEular = _target.specularRotation.eulerAngles;
            CacheProperties();
        }
    }
    
    private void CacheProperties()
    {
        _lastColor = _light.color;
        _lastAtten = _light.intensity;
        _lastRotation = _target.transform.rotation;
    }

    public override void OnInspectorGUI()
    {
        base.OnInspectorGUI();
        if (_light != null)
        {
            if (_lastRotation != _target.transform.rotation ||
                _lastColor != _light.color ||
                _lastAtten != _light.intensity)
            {
                _target.SetLight(_light);
                CacheProperties();
            }
            var eular = EditorGUILayout.Vector3Field("Specular Dir Eular", _lastSpecularEular);
            if (eular != _lastSpecularEular)
            {
                _target.specularRotation = Quaternion.Euler(eular);
                _lastSpecularEular = eular;
                _target.SetLight(_light);
				EditorUtility.SetDirty (_target);
				EditorSceneManager.MarkSceneDirty (EditorSceneManager.GetActiveScene());
            }
        }
        if (GUILayout.Button("Reset Specular Dir"))
        {
            _target.specularRotation = _target.transform.rotation;
            _lastSpecularEular = _target.specularRotation.eulerAngles;
            _target.SetLight(_light);
			EditorUtility.SetDirty (_target);
			EditorSceneManager.MarkSceneDirty (EditorSceneManager.GetActiveScene());
        }
    }
}