using UnityEngine;
using UnityEditor;

using System.Linq;
using System.Reflection;

namespace SK.Framework
{
    [CustomEditor(typeof(RectTransform)), CanEditMultipleObjects]
    public sealed class RectTransformInspector : Editor
    {
        private MethodInfo onSceneGUI;
        private Editor instance;

        private static readonly object[] emptyArray = new object[0];

        private void OnEnable()
        {
            var editorType = Assembly.GetAssembly(typeof(Editor)).GetTypes().FirstOrDefault(m => m.Name == "RectTransformEditor");
            instance = CreateEditor(targets, editorType);
            onSceneGUI = editorType.GetMethod("OnSceneGUI", BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic);
        }

        public override void OnInspectorGUI()
        {
            if (instance)
            {
                instance.OnInspectorGUI();
            }
            GUILayout.Space(20f);

            if(GUILayout.Button("Auto Anchors"))
            {
                for (int i = 0; i < targets.Length; i++)
                {
                    RectTransform tempTarget = targets[i] as RectTransform;
                    Undo.RecordObject(tempTarget, "Auto Anchors");
                    RectTransform prt = tempTarget.parent as RectTransform;
                    Vector2 anchorMin = new Vector2(
                        tempTarget.anchorMin.x + tempTarget.offsetMin.x / prt.rect.width,
                        tempTarget.anchorMin.y + tempTarget.offsetMin.y / prt.rect.height);
                    Vector2 anchorMax = new Vector2(
                        tempTarget.anchorMax.x + tempTarget.offsetMax.x / prt.rect.width,
                        tempTarget.anchorMax.y + tempTarget.offsetMax.y / prt.rect.height);
                    tempTarget.anchorMin = anchorMin;
                    tempTarget.anchorMax = anchorMax;
                    tempTarget.offsetMin = tempTarget.offsetMax = Vector2.zero;
                    //zq
                    tempTarget.pivot = new Vector2(.5f, .5f);
                }
            }
            //UI位置
            //if (GUILayout.Button("位置"))
            //{
            //    for (int i = 0; i < targets.Length; i++)
            //    {
            //        RectTransform tempTarget = targets[i] as RectTransform;
            //        Undo.RecordObject(tempTarget, "Auto Anchors");
                    
                   

            //        tempTarget.anchorMin = Vector2.zero;
            //        tempTarget.anchorMax = Vector2.zero;
            //      //  tempTarget.offsetMin = tempTarget.offsetMax = Vector2.zero;

            //        tempTarget.pivot = Vector2.zero;
            //    }
            //}
        }

        private void OnSceneGUI()
        {
            if(instance)
            {
                onSceneGUI.Invoke(instance, emptyArray);
            }
        }
        private void OnDisable()
        {
            if(instance)
            {
                DestroyImmediate(instance);
            }
        }
    }
}