using System.Collections.Generic;
using UnityEditor;
using UnityEngine;

namespace Aliciza.UXTool
{
    public static class UIBuilderUtil
    {
        public static void DuplicateSelectedObjects()
        {
            GameObject[] selectedObjects = UXSelectionUtil.gameObjects;
            List<GameObject> duplicateObjects = new List<GameObject>();
            foreach (var orginObject in selectedObjects)
            {
                GameObject duplicate = Object.Instantiate(orginObject, orginObject.transform.parent);
                duplicateObjects.Add(duplicate);
            }
            Undo.RecordObjects(duplicateObjects.ToArray(), "Duplicate Objects");
        }

        /// <summary>
        /// 创建并设置 UI 对象的工具方法。
        /// </summary>
        /// <param name="source">可以是预制体或现有对象</param>
        /// <param name="parent">指定父级 Transform</param>
        /// <param name="fullScreen">是否设置为全屏填充</param>
        /// <param name="useOriginalSize">是否按照原始大小显示</param>
        /// <param name="customScale">自定义缩放比例（可选）</param>
        /// <param name="usePrefabMode">是否强制使用预制体模式（默认为 true，如果传入的是预制体，将在父节点下实例化）</param>
        /// <returns>返回创建的 GameObject</returns>
        public static GameObject CreateUIObject(GameObject source, Transform parent, bool fullScreen = false, bool useOriginalSize = false, Vector3? customScale = null, bool usePrefabMode = true)
        {
            // 如果 source 是 null，抛出异常
            if (source == null)
            {
                Debug.LogError("传入的对象为空！无法创建 UI 对象。");
                return null;
            }

            GameObject instance;

            // 判断是否需要使用预制体模式
            if (usePrefabMode && IsPrefab(source))
            {
                // 如果是预制体，则在父节点下实例化
                instance =  Object.Instantiate(source, parent);
                instance.name = source.name;
            }
            else
            {
                // 否则直接使用传入的对象
                instance = source;
                instance.transform.SetParent(parent);
            }

            // 设置 RectTransform
            RectTransform rectTransform = instance.GetComponent<RectTransform>();

            if (rectTransform == null)
            {
                Debug.LogError("传入的对象没有 RectTransform 组件，无法作为 UI 对象使用！");
                return null;
            }

            rectTransform.localScale = customScale ?? Vector3.one; // 使用自定义缩放，默认为 1,1,1
            rectTransform.localPosition = Vector3.zero; // 默认位置为 (0, 0)

            // 设置锚点和偏移量
            if (fullScreen)
            {
                rectTransform.anchorMin = Vector2.zero; // 左下角锚点
                rectTransform.anchorMax = Vector2.one; // 右上角锚点
                rectTransform.offsetMin = Vector2.zero; // 左下角偏移为 0
                rectTransform.offsetMax = Vector2.zero; // 右上角偏移为 0
            }
            else if (useOriginalSize)
            {
                // 如果使用原始大小，则保留锚点和偏移量，通常不修改
                rectTransform.anchorMin = new Vector2(0.5f, 0.5f); // 设置锚点到中心
                rectTransform.anchorMax = new Vector2(0.5f, 0.5f);
                rectTransform.anchoredPosition = Vector2.zero; // 保证在父级中心位置
            }
            else
            {
                // 默认大小逻辑，保持当前锚点和偏移
                rectTransform.offsetMin = rectTransform.offsetMin;
                rectTransform.offsetMax = rectTransform.offsetMax;
            }

            return instance;
        }



        /// <summary>
        /// 判断传入的对象是否为预制体。
        /// </summary>
        /// <param name="source">待检查的对象</param>
        /// <returns>如果是预制体，返回 true；否则返回 false</returns>
        public static bool IsPrefab(GameObject source)
        {
#if UNITY_EDITOR
            return UnityEditor.PrefabUtility.GetPrefabAssetType(source) != UnityEditor.PrefabAssetType.NotAPrefab;
#else
            Debug.LogWarning("只能在编辑器模式下检查是否为预制体。");
            return false;
#endif
        }

        //创建UX UI前都会创建一个GameObject来挂载Component

        private static GameObject CreateUIObjWithParent(string name)
        {
            RectTransform parent;
            bool haveParent = Utils.TryGetSelectionRectTransform(out parent);
            if (haveParent)
            {
                var obj = new GameObject(name);
                obj.layer = LayerMask.NameToLayer("UI");
                var rectTransform = obj.AddComponent<RectTransform>();
                rectTransform.sizeDelta = new Vector2(200, 200);
                obj.transform.SetParent(parent.transform);
                obj.GetComponent<RectTransform>().localPosition = new Vector3(0, 0, 0);
                Undo.RegisterCreatedObjectUndo(obj.gameObject, "Create" + obj.name);
                return obj;
            }
            else
            {
                EditorUtility.DisplayDialog("messageBox",
                    "请先选择一个父节点",
                    "确定",
                    "取消");
                return null;
            }
        }

        public static GameObject CreateUIObj(string name)
        {
            var obj = new GameObject(name);
            obj.layer = LayerMask.NameToLayer("UI");
            var rectTransform = obj.AddComponent<RectTransform>();
            rectTransform.sizeDelta = new Vector2(100, 100);
            obj.GetComponent<RectTransform>().localPosition = new Vector3(0, 0, 0);
            return obj;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="name"></param>
        /// <param name="pos">LocalPosition</param>
        /// <param name="size"></param>
        /// <param name="selection"></param>
        /// <returns></returns>
        public static GameObject CreateUIObj(string name, Vector3 pos, Vector3 size, GameObject[] selection)
        {
            name = "UX" + name;
            var obj = new GameObject(name);
            Undo.RegisterCreatedObjectUndo(obj, "");
            obj.layer = LayerMask.NameToLayer("UI");
            Transform parent;
            parent = FindContainerLogic.GetObjectParent(selection);
            Undo.SetTransformParent(obj.transform, parent, "");
            obj.transform.SetParent(parent);

            var rectTransform = Undo.AddComponent<RectTransform>(obj);
            rectTransform.sizeDelta = size;
            obj.transform.localPosition = pos;
            obj.transform.localScale = Vector3.one;
            Undo.SetCurrentGroupName("Create " + name);
            return obj;
        }
    }
}