using UnityEngine;
using UnityEngine.UI;

namespace AdaptUI
{
    [ExecuteAlways]
    [RequireComponent(typeof(RectTransform))]
    public class UIHorizontalLayoutGroup : MonoBehaviour
    {
        [Header("Default Layout")]
        public UILayoutData defaultLayout = new UILayoutData();

        [Header("iPhone Layout")]
        public UILayoutData iPhoneLayout = new UILayoutData();

        [Header("iPad Layout")]
        public UILayoutData iPadLayout = new UILayoutData();

        private HorizontalLayoutGroup layoutGroup;
        private bool isInitialized = false; // ✅ 防止重复初始化

        private void Reset()
        {
            layoutGroup = GetComponent<HorizontalLayoutGroup>();

            if (!isInitialized)
            {
               // Debug.Log("UIHorizontalLayoutGroup: 首次挂载，自动记录当前 UI 作为默认布局");

                // ✅ 这里不会报错了！
                defaultLayout = new UILayoutData
                {
                    paddingLeft = Mathf.RoundToInt(layoutGroup.padding.left),
                    paddingRight = Mathf.RoundToInt(layoutGroup.padding.right),
                    paddingTop = Mathf.RoundToInt(layoutGroup.padding.top),
                    paddingBottom = Mathf.RoundToInt(layoutGroup.padding.bottom),
                    spacing = layoutGroup.spacing,

                    childAlignment = layoutGroup.childAlignment,
                    reverseArrangement = layoutGroup.reverseArrangement, 

                    controlChildWidth = layoutGroup.childControlWidth,
                    controlChildHeight = layoutGroup.childControlHeight,

                    useChildScaleWidth = layoutGroup.childScaleWidth,
                    useChildScaleHeight = layoutGroup.childScaleHeight,

                    childForceExpandWidth = layoutGroup.childForceExpandWidth,
                    childForceExpandHeight = layoutGroup.childForceExpandHeight
                };

                iPhoneLayout = new UILayoutData(defaultLayout);
                iPadLayout = new UILayoutData(defaultLayout);

                isInitialized = true; // ✅ 避免 Awake() 误触
            }
        }

        private void Awake()
        {
            layoutGroup = GetComponent<HorizontalLayoutGroup>();
            #if UNITY_EDITOR
           // 如果未初始化，不要应用布局，等待 Reset() 赋值
            if (!isInitialized)
            {
                //Debug.Log("UIAdaptiveRect: 未初始化，跳过 ApplyLayout()");
                if (Application.isPlaying)
                    ApplyLayout();
                return;
            }
            #endif
            ApplyLayout();
        }
        
        public void ApplyLayout()
        {
            if (layoutGroup == null)
            {
              //  Debug.LogError("[ApplyLayout] ❌ layoutGroup 为空，无法应用布局！");
                return;
            }

            UILayoutData layout = GetCurrentLayout();
           // Debug.Log($"[ApplyLayout] 📌 选中的布局数据: {layout}");

            // ✅ 设置 HorizontalLayoutGroup 的布局参数
            layoutGroup.padding.left = layout.paddingLeft;
            layoutGroup.padding.right = layout.paddingRight;
            layoutGroup.padding.top = layout.paddingTop;
            layoutGroup.padding.bottom = layout.paddingBottom;

            layoutGroup.spacing = layout.spacing;
            layoutGroup.childAlignment = layout.childAlignment;

            layoutGroup.childControlWidth = layout.controlChildWidth;
            layoutGroup.childControlHeight = layout.controlChildHeight;

            layoutGroup.childScaleWidth = layout.useChildScaleWidth;
            layoutGroup.childScaleHeight = layout.useChildScaleHeight;

            layoutGroup.childForceExpandWidth = layout.childForceExpandWidth;
            layoutGroup.childForceExpandHeight = layout.childForceExpandHeight;

            // Debug.Log($"[ApplyLayout] 🔄 更新 layoutGroup: " +
            //           $"Padding=({layoutGroup.padding.left}, {layoutGroup.padding.right}, {layoutGroup.padding.top}, {layoutGroup.padding.bottom}), " +
            //           $"Spacing={layoutGroup.spacing}, Alignment={layoutGroup.childAlignment}, " +
            //           $"Control(W,H)=({layoutGroup.childControlWidth}, {layoutGroup.childControlHeight}), " +
            //           $"Scale(W,H)=({layoutGroup.childScaleWidth}, {layoutGroup.childScaleHeight}), " +
            //           $"Expand(W,H)=({layoutGroup.childForceExpandWidth}, {layoutGroup.childForceExpandHeight})");

            // ✅ 强制更新布局
            LayoutRebuilder.ForceRebuildLayoutImmediate(layoutGroup.GetComponent<RectTransform>());

            // Debug.Log("[ApplyLayout] ✅ 布局已更新！");
        }

        private UILayoutData GetCurrentLayout()
        {
            DeviceTypeHelper.DeviceType deviceType = DeviceTypeHelper.DetectDeviceType();

            switch (deviceType)
            {
                case DeviceTypeHelper.DeviceType.iPhone:
                  //  Debug.Log("[GetCurrentLayout] 📱 当前设备: iPhone，使用 iPhone 布局");
                    return iPhoneLayout;

                case DeviceTypeHelper.DeviceType.iPad:
                   // Debug.Log("[GetCurrentLayout] 📲 当前设备: iPad，使用 iPad 布局");
                    return iPadLayout;

                default:
                  //  Debug.Log("[GetCurrentLayout] 💻 未知设备，使用 Default 布局");
                    return defaultLayout;
            }
        }

    }
}