using System.Collections;
using System.Collections.Generic;
using UnityEditor;
using UnityEditor.UI;
using UnityEngine;
using UnityEngine.UI;
using XRTool.Util;

namespace XRTool.WorldUI
{
    [InitializeOnLoad]
    [CustomEditor(typeof(XRScrollRect))]
    public class XRScrollRectEditor : ScrollRectEditor
    {
        private SerializedProperty layoutType;
        private SerializedProperty isLoop;
        private XRScrollRect xRScroll;
        protected override void OnEnable()
        {
            base.OnEnable();
            layoutType = serializedObject.FindProperty("layoutType");
            isLoop = serializedObject.FindProperty("isLoop");
            xRScroll = target as XRScrollRect;
        }

        public override void OnInspectorGUI()
        {
            base.OnInspectorGUI();
            EditorGUILayout.PropertyField(layoutType);
            EditorGUILayout.PropertyField(isLoop);
            serializedObject.ApplyModifiedProperties();
            if (GUI.changed)
            {
                ///当指定布局管理器时
                if (xRScroll.layoutType != LayoutType.UnKnow)
                {
                    if (xRScroll.content)
                    {
                        var layout = xRScroll.content.GetComponent<LayoutGroup>();
                        if (layout)
                        {
                            bool isDel = false;
                            if (xRScroll.layoutType == LayoutType.None)
                            {
                                isDel = true;
                            }
                            if (xRScroll.layoutType == LayoutType.GridLayoutGroup)
                            {
                                if (!(layout is GridLayoutGroup))
                                {
                                    isDel = true;
                                }
                            }
                            else if (xRScroll.layoutType == LayoutType.HorizontalLayoutGroup)
                            {
                                if (!(layout is HorizontalLayoutGroup))
                                {
                                    isDel = true;
                                }
                            }
                            else if (xRScroll.layoutType == LayoutType.VerticalLayoutGroup)
                            {
                                if (!(layout is VerticalLayoutGroup))
                                {
                                    isDel = true;
                                }
                            }
                            if (isDel)
                            {
                                DestroyImmediate(layout);
                                layout = null;
                            }
                        }
                        if (!layout)
                        {
                            if (xRScroll.layoutType == LayoutType.GridLayoutGroup)
                            {
                                layout = xRScroll.content.gameObject.AddComponent<GridLayoutGroup>();
                            }
                            else if (xRScroll.layoutType == LayoutType.HorizontalLayoutGroup)
                            {
                                layout = xRScroll.content.gameObject.AddComponent<HorizontalLayoutGroup>();
                            }
                            else if (xRScroll.layoutType == LayoutType.VerticalLayoutGroup)
                            {
                                layout = xRScroll.content.gameObject.AddComponent<VerticalLayoutGroup>();
                            }
                        }
                    }
                }
            }
        }

        [MenuItem("GameObject/XRUI/XRScrollRect", priority = 0)]
        static void Init()
        {
            var obj = Instantiate(Resources.Load<XRScrollRect>(typeof(XRScrollRect).Name));
            obj.name = (typeof(XRScrollRect).Name);
            if (obj)
            {
                var parent = Selection.activeGameObject;
                if (!parent)
                {
                    var canvas = GameObject.FindObjectsOfType(typeof(Canvas));
                    if (canvas != null)
                    {
                        for (int i = 0; i < canvas.Length; i++)
                        {
                            if ((canvas[i] as Canvas).renderMode == RenderMode.WorldSpace)
                            {
                                parent = (canvas[i] as Canvas).gameObject;
                                break;
                            }
                        }
                    }
                }
                UnityUtil.SetParent(parent ? parent.transform : null, obj.transform);
                Selection.activeGameObject = obj.gameObject;
            }
        }
    }
}