using System;
using System.Collections;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using Kill.UI.Components;
using UnityEngine;
using UnityEngine.UI;

namespace Kill.UI.Pages
{
    /// <summary>
    /// 二维码扫描器 - 调用摄像头扫描二维码
    /// </summary>
    public class ScanQRcode : MonoBehaviour
    {
        [Serializable]
        public enum ScanType
        {
            ConnectDevice, // 连接设备
            Other          // 其他用途
        }
        [Header("UI组件")]
        public RawImage cameraPreview;  // 摄像头预览
        [Header("扫描设置")]
        float scanInterval = 0.05f; // 扫描间隔（秒），密集扫描提升远距离识别率
        public ScanType scanType = ScanType.ConnectDevice; // 扫描类型

        [Header("性能优化")]
        [Tooltip("扫描处理线程数")]
        bool useAsyncScan = true;

        [Header("中心裁切放大")]
        [Tooltip("截取画面中心区域的比例（0-1），值越小放越大。\n推荐：近距离 0.55~0.65；远距离扫码 0.8~0.9")]
        [Range(0.3f, 1.0f)]
        float centerCropRatio = 1f;

#if UNITY_IOS && !UNITY_EDITOR
        [DllImport("__Internal")]
        private static extern void _EnableContinuousAutoFocus();

        [DllImport("__Internal")]
        private static extern void _TriggerAutoFocus(float normalizedX, float normalizedY);

        [DllImport("__Internal")]
        private static extern void _TriggerContinuousRefocus();
#endif

#if UNITY_ANDROID && !UNITY_EDITOR
        // 通过反射拿到的 WebCamTexture 内部 Camera 实例（Unity 2022 LTS 一般拿不到，详见 EnableAndroidContinuousAutoFocus）
        private AndroidJavaObject androidCameraInstance;
        // 标记是否成功接管对焦控制
        private bool androidFocusControlAvailable = false;
#endif

        // 摄像头相关
        private WebCamTexture webCamTexture;
        private WebCamDevice currentDevice;
        private bool isScanning = false;
        private bool isProcessing = false;

        // 扫描结果回调
        public event Action<string> OnQRCodeScanned;

        void OnEnable()
        {
            StartScan();
        }

        void OnDisable()
        {
            StopScan();
        }

        // 手动重新对焦防抖时间：0.6s 内的重复点击只触发一次，避免过于频繁触发对焦
        private float lastManualRefocusTime = -10f;
        private const float ManualRefocusCooldown = 0.6f;

        /// <summary>
        /// 用户手动点击预览时调用：触发一次软重新对焦（无黑屏，体验好）。
        /// 已接管 Camera 的设备走点对焦；未接管（Unity 2022 LTS 默认情况）走 autoFocusPoint 重新设置。
        /// </summary>
        public void TriggerRefocus()
        {
            if (!isScanning) return;
            if (Time.unscaledTime - lastManualRefocusTime < ManualRefocusCooldown) return;

            lastManualRefocusTime = Time.unscaledTime;

#if UNITY_IOS && !UNITY_EDITOR
            // iOS：调用原生插件触发一次点对焦（1.5s 后原生自动恢复连续对焦，无黑屏）
            _TriggerContinuousRefocus();
#elif UNITY_ANDROID && !UNITY_EDITOR
            if (androidFocusControlAvailable && androidCameraInstance != null)
            {
                // 已接管：走正常的点对焦
                TriggerAndroidAutoFocus(0.5f, 0.5f);
            }
            else
            {
                // 未接管：走软触发（无黑屏）
                Debug.Log("[ScanQRcode] 用户点击预览，触发软重新对焦");
                SoftTriggerAndroidFocus();
            }
#else
            // 编辑器/其他平台：无操作
#endif
        }

        /// <summary>
        /// 开始扫描
        /// </summary>
        public void StartScan()
        {
            if (isScanning) return;

            StartCoroutine(InitializeCamera());
        }

        /// <summary>
        /// 停止扫描
        /// </summary>
        public void StopScan()
        {
            isScanning = false;
            StopAllCoroutines();

            if (webCamTexture != null && webCamTexture.isPlaying)
            {
                webCamTexture.Stop();
                webCamTexture = null;
            }
            
            // 清理预览纹理
            if (previewTexture != null)
            {
                Destroy(previewTexture);
                previewTexture = null;
            }

#if UNITY_ANDROID && !UNITY_EDITOR
            // 反射拿到的 Camera 实例由 WebCamTexture 内部管理，仅清空引用即可
            if (androidCameraInstance != null)
            {
                androidCameraInstance.Dispose();
                androidCameraInstance = null;
            }
            androidFocusControlAvailable = false;
#endif
        }

        /// <summary>
        /// 关闭扫码界面
        /// </summary>
        public void Close()
        {
            StopScan();
            gameObject.SetActive(false);
        }

        /// <summary>
        /// 初始化摄像头
        /// </summary>
        private IEnumerator InitializeCamera()
        {
            // Android 使用 Permission API 请求权限
#if UNITY_ANDROID && !UNITY_EDITOR
            if (!UnityEngine.Android.Permission.HasUserAuthorizedPermission(UnityEngine.Android.Permission.Camera))
            {
                UnityEngine.Android.Permission.RequestUserPermission(UnityEngine.Android.Permission.Camera);
                // 等待权限请求结果
                yield return new WaitUntil(() => UnityEngine.Android.Permission.HasUserAuthorizedPermission(UnityEngine.Android.Permission.Camera));
            }
            
            if (!UnityEngine.Android.Permission.HasUserAuthorizedPermission(UnityEngine.Android.Permission.Camera))
            {
                UpdateStatus("100085");
                yield break;
            }
#else
            // 其他平台使用传统方式
            yield return Application.RequestUserAuthorization(UserAuthorization.WebCam);

            if (!Application.HasUserAuthorization(UserAuthorization.WebCam))
            {
                UpdateStatus("100085");
                yield break;
            }
#endif

            // 获取后置摄像头
            WebCamDevice[] devices = WebCamTexture.devices;
            if (devices.Length == 0)
            {
                UpdateStatus("100086");
                yield break;
            }

            // 优先使用后置摄像头，并选择支持自动对焦的摄像头
            string deviceName = devices[0].name;
            for (int i = 0; i < devices.Length; i++)
            {
                if (!devices[i].isFrontFacing)
                {
                    deviceName = devices[i].name;
                    currentDevice = devices[i];
                    break;
                }
            }
            RectTransform cameraPreviewRect=cameraPreview.GetComponent<RectTransform>();
            // 尝试更高分辨率（4K）；WebCamTexture 在不支持时会自动回退到设备最大值
            // 注意：高分辨率下解码 CPU 压力大，需要配合性能较好的设备
            webCamTexture = new WebCamTexture(deviceName, 3840, 2160, 30);

            // 开始播放
            webCamTexture.Play();

            // 等待摄像头启动
            yield return new WaitUntil(() => webCamTexture.width > 100);

            // 输出实际分辨率，方便确认设备用的最大值
            Debug.Log($"[ScanQRcode] 摄像头实际分辨率: {webCamTexture.width}x{webCamTexture.height}");

            // 等 0.3s 再触发对焦，避免系统未准备好
            yield return new WaitForSeconds(0.3f);

#if UNITY_IOS && !UNITY_EDITOR
            // iOS: 通过原生插件开启连续自动对焦（autoFocusPoint 在 iOS 无效）
            _EnableContinuousAutoFocus();
            // 周期维护对焦：每 3s 触发一次点对焦（无黑屏），让镜头持续对焦
            StartCoroutine(IOsFocusMaintainCoroutine());
#elif UNITY_ANDROID && !UNITY_EDITOR
            // Android：WebCamTexture 默认不会自动对焦，需主动通过 Camera API 触发
            EnableAndroidContinuousAutoFocus();
            // 仅当我们拿到 Camera 实例时才启动对焦维护协程（Unity 2022 LTS Camera2 后端一般拿不到）
            if (androidFocusControlAvailable)
            {
                StartCoroutine(AndroidFocusMaintainCoroutine());
            }
            else
            {
                // 兜底：未接管到 Camera 时，周期性触发重新对焦（部分只对焦一次的设备）
                StartCoroutine(AndroidFallbackFocusMaintainCoroutine());
            }
#endif
            webCamTexture.autoFocusPoint = new Vector2(0.5f, 0.5f);
            // 调整预览画面比例
            AdjustPreviewAspect();
            
            isScanning = true;
            // 开始预览更新和扫描
            StartCoroutine(PreviewUpdateCoroutine());
            StartCoroutine(ScanCoroutine());
        }
     

        // 预览纹理长边基准（按 RawImage 实际宽高比生成，避免变形）
        // 保持 UI RectTransform 比例，内部纹理按比例放大到接近 1080 长边
        // 但不超过相机实际分辨率的 1.5 倍，避免低端设备过度放大导致画质损失
        private const int PreviewTextureLongSide = 1080;
        private const float MaxUpscaleRatio = 1.5f;

        /// <summary>
        /// 调整预览画面比例 - 从相机画面中心截取并旋转，生成与 UI 框同比例的高清纹理。
        /// 手机竖着拿，摄像头默认横向输出，需要旋转 90 度。
        /// 预览纹理宽高比跟随 RawImage RectTransform 宽高比，长边固定 1080，
        /// 既保证远距离扫码识别率，又避免画面变形。
        /// 对低端设备（720p 摄像头）会自适应降低纹理尺寸，避免过度放大导致画质损失。
        /// </summary>
        private void AdjustPreviewAspect()
        {
            if (webCamTexture == null || cameraPreview == null) return;

            // 获取相机分辨率（摄像头默认横向，如 3840x2160 / 1920x1080 / 1280x720）
            int cameraWidth = webCamTexture.width;
            int cameraHeight = webCamTexture.height;

            // 获取预览区域尺寸（用于按比例生成纹理，避免变形）
            RectTransform previewRect = cameraPreview.GetComponent<RectTransform>();
            float rectW = Mathf.Max(1, previewRect.rect.width);
            float rectH = Mathf.Max(1, previewRect.rect.height);

            // 相机短边（旋转后对应预览宽边），用于限制过度放大
            int cameraShortSide = Mathf.Min(cameraWidth, cameraHeight);

            // 按 RectTransform 比例计算纹理尺寸（长边固定 1080）
            int previewWidth, previewHeight;
            if (rectW >= rectH)
            {
                previewWidth = PreviewTextureLongSide;
                previewHeight = Mathf.Max(1, Mathf.RoundToInt(PreviewTextureLongSide * (rectH / rectW)));
            }
            else
            {
                previewHeight = PreviewTextureLongSide;
                previewWidth = Mathf.Max(1, Mathf.RoundToInt(PreviewTextureLongSide * (rectW / rectH)));
            }

            // 自适应：如果纹理长边超过相机短边的 1.5 倍，按相机分辨率等比缩小（保护低端设备画质）
            int previewLongSide = Mathf.Max(previewWidth, previewHeight);
            int maxAllowedLong = Mathf.RoundToInt(cameraShortSide * MaxUpscaleRatio);
            if (previewLongSide > maxAllowedLong)
            {
                float scale = (float)maxAllowedLong / previewLongSide;
                previewWidth = Mathf.Max(1, Mathf.RoundToInt(previewWidth * scale));
                previewHeight = Mathf.Max(1, Mathf.RoundToInt(previewHeight * scale));
            }

            // 创建预览纹理（按 UI 比例）
            if (previewTexture == null || previewTexture.width != previewWidth || previewTexture.height != previewHeight)
            {
                if (previewTexture != null)
                {
                    Destroy(previewTexture);
                }
                previewTexture = new Texture2D(previewWidth, previewHeight, TextureFormat.RGB24, false);
            }

            // 从相机画面中裁切并旋转
            CutAndRotateCameraFrame(cameraWidth, cameraHeight, previewWidth, previewHeight);

            // 设置预览纹理
            cameraPreview.texture = previewTexture;
            cameraPreview.uvRect = new Rect(0, 0, 1, 1);

            // 重置旋转（因为已经在像素层面旋转了）
            previewRect.localEulerAngles = Vector3.zero;

            Debug.Log($"[ScanQRcode] 预览调整 - 相机: {cameraWidth}x{cameraHeight}, 预览: {previewWidth}x{previewHeight}");
        }

#if UNITY_IOS && !UNITY_EDITOR
        /// <summary>
        /// iOS 对焦维护协程 — 每 3s 触发一次点对焦（无黑屏），让镜头持续重新对焦
        /// 与 Android softTrigger 策略保持一致
        /// </summary>
        private IEnumerator IOsFocusMaintainCoroutine()
        {
            // 首次等待 3s 让初始对焦完成
            yield return new WaitForSeconds(3f);

            while (isScanning)
            {
                // 触发一次点对焦（无黑屏），1.5s 后原生会自动恢复连续对焦
                _TriggerContinuousRefocus();
                yield return new WaitForSeconds(3f);
            }
        }
#endif

#if UNITY_ANDROID && !UNITY_EDITOR
        /// <summary>
        /// 启用 Android 自动对焦。
        /// Unity 2022 LTS 在 Android 上使用 Camera2 API 内部创建 CameraDevice，
        /// 无法直接反射拿到 Camera 对象，本方法仅尝试拿到旧 Camera API 的实例。
        /// 失败时仅打印日志，不阻塞扫码流程（依赖系统默认对焦）。
        /// </summary>
        private void EnableAndroidContinuousAutoFocus()
        {
            androidCameraInstance = GetAndroidCameraFromWebCamTexture(webCamTexture);
            if (androidCameraInstance != null)
            {
                try
                {
                    SetCameraFocusMode(androidCameraInstance, "FOCUS_MODE_CONTINUOUS_PICTURE");
                    androidFocusControlAvailable = true;
                    Debug.Log("[ScanQRcode] Android 自动对焦已接管（FOCUS_MODE_CONTINUOUS_PICTURE）");
                }
                catch (Exception e)
                {
                    Debug.LogWarning($"[ScanQRcode] 设置 Android 自动对焦模式失败: {e.Message}");
                    androidFocusControlAvailable = false;
                }
            }
            else
            {
                androidFocusControlAvailable = false;
                // 尝试让 WebCamTexture 自身使用自动对焦（部分 ROM 支持）
                try { webCamTexture.autoFocusPoint = new Vector2(0.5f, 0.5f); } catch { }
            }
        }

        /// <summary>
        /// 触发 Android 单次自动对焦（指定点）
        /// </summary>
        private void TriggerAndroidAutoFocus(float normX, float normY)
        {
            if (!androidFocusControlAvailable || androidCameraInstance == null)
            {
                // 没接管到对焦，触摸对焦无效（保持安静，不打日志避免刷屏）
                return;
            }

            try
            {
                // 屏幕坐标 -> camera 坐标系（Camera API 的 focusAreas 使用 -1000~1000 坐标系）
                int focusX = Mathf.RoundToInt((normX - 0.5f) * 2000f);
                int focusY = Mathf.RoundToInt((normY - 0.5f) * 2000f);

                using (var rectClass = new AndroidJavaClass("android.graphics.Rect"))
                using (var area = rectClass.CallStatic<AndroidJavaObject>("new", focusX - 100, focusY - 100, focusX + 100, focusY + 100))
                using (var areasList = new AndroidJavaObject("java.util.ArrayList"))
                {
                    areasList.Call<bool>("add", area);
                    androidCameraInstance.Call("setFocusAreas", areasList);
                    androidCameraInstance.Call("setMeteringAreas", areasList);
                }

                // 先切到 AUTO 模式才能执行单次对焦，对焦完再切回 CONTINUOUS
                SetCameraFocusMode(androidCameraInstance, "FOCUS_MODE_AUTO");

                // AndroidJavaProxy 不是 IDisposable，不能 using；也不需要 Dispose，GC 即可回收
                var callback = new AutoFocusCallbackProxy(this);
                androidCameraInstance.Call("autoFocus", callback);

                // 1.5s 后切回连续模式（对焦回调可能未触发，需要兜底）
                StartCoroutine(RestoreContinuousFocusAfter(1.5f));
            }
            catch (Exception e)
            {
                Debug.LogWarning($"[ScanQRcode] Android 触摸对焦失败: {e.Message}");
            }
        }

        private IEnumerator RestoreContinuousFocusAfter(float seconds)
        {
            yield return new WaitForSeconds(seconds);
            if (androidFocusControlAvailable && androidCameraInstance != null)
            {
                SetCameraFocusMode(androidCameraInstance, "FOCUS_MODE_CONTINUOUS_PICTURE");
            }
        }

        /// <summary>
        /// 周期性重新设置连续对焦，防止 Android 镜头因失焦后停止自动对焦
        /// </summary>
        private IEnumerator AndroidFocusMaintainCoroutine()
        {
            while (isScanning)
            {
                yield return new WaitForSeconds(2.5f);
                if (androidFocusControlAvailable && androidCameraInstance != null)
                {
                    try
                    {
                        SetCameraFocusMode(androidCameraInstance, "FOCUS_MODE_CONTINUOUS_PICTURE");
                    }
                    catch { /* 实例可能已被释放，下次循环重试 */ }
                }
            }
        }

        /// <summary>
        /// 兜底对焦策略：未接管到 Camera 实例时（Unity 2022 LTS 默认情况），
        /// 每 3s 通过 softTrigger（autoFocusPoint 重新设置，几乎无感）让镜头重新对焦。
        /// 用户也可通过调用 TriggerRefocus() 主动触发。
        /// </summary>
        private IEnumerator AndroidFallbackFocusMaintainCoroutine()
        {
            // 首次等待 3s 让初始对焦完成
            yield return new WaitForSeconds(3f);

            while (isScanning && webCamTexture != null)
            {
                // 如果在运行中已经接管到对焦控制（理论上不会变），停止兜底
                if (androidFocusControlAvailable) break;

                // 软触发：重新设置 autoFocusPoint（无黑屏）
                SoftTriggerAndroidFocus();

                yield return new WaitForSeconds(3f);
            }
        }

        /// <summary>
        /// 软触发对焦：通过重新设置 autoFocusPoint 让手机做一次快速对焦，无黑屏。
        /// 部分手机响应后会重新对焦，部分手机忽略此属性（需要走硬重启兜底）。
        /// </summary>
        private void SoftTriggerAndroidFocus()
        {
            if (webCamTexture == null || !webCamTexture.isPlaying) return;
            try
            {
                // 在 (0.5, 0.5) 和 (0.5, 0.51) 之间切换，强制触发 setter
                // 相同值部分 ROM 不响应，需要做点变化
                webCamTexture.autoFocusPoint = new Vector2(0.5f, 0.51f);
                webCamTexture.autoFocusPoint = new Vector2(0.5f, 0.5f);
            }
            catch (Exception e)
            {
                Debug.LogWarning($"[ScanQRcode] softTrigger 失败: {e.Message}");
            }
        }

        /// <summary>
        /// 通过停止+重新播放 WebCamTexture 强制镜头重新对焦。
        /// 注意：会有约 200~500ms 的预览黑屏闪烁，权衡使用。
        /// </summary>
        private void RestartWebCamTextureForFocus()
        {
            try
            {
                if (webCamTexture == null) return;
                webCamTexture.Stop();
                webCamTexture.Play();
            }
            catch (Exception e)
            {
                Debug.LogWarning($"[ScanQRcode] 重启 WebCamTexture 失败: {e.Message}");
            }
        }

        /// <summary>
        /// 通过反射从 WebCamTexture 拿到内部的 android.hardware.Camera 实例。
        /// 注意：Unity 2022 LTS 在 Android 上使用 Camera2 API，此反射在 2022 LTS 上几乎拿不到值。
        /// </summary>
        private AndroidJavaObject GetAndroidCameraFromWebCamTexture(WebCamTexture tex)
        {
            try
            {
                string[] candidates = { "m_Camera", "m_NativeCamera", "camera", "mCamera" };
                foreach (var name in candidates)
                {
                    var f = typeof(WebCamTexture).GetField(name,
                        System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
                    if (f != null)
                    {
                        var v = f.GetValue(tex);
                        if (v is AndroidJavaObject ajo) return ajo;
                    }
                }
            }
            catch (Exception e)
            {
                Debug.LogWarning($"[ScanQRcode] 反射获取 Camera 失败: {e.Message}");
            }
            return null;
        }

        /// <summary>
        /// 设置 Camera 对焦模式（Camera API 官方推荐通过 setParameters 设置）
        /// </summary>
        private void SetCameraFocusMode(AndroidJavaObject camera, string modeName)
        {
            if (camera == null) return;
            using (var parameters = camera.Call<AndroidJavaObject>("getParameters"))
            {
                parameters.Call("setFocusMode", modeName);
                camera.Call("setParameters", parameters);
            }
            // 部分旧设备直接调用 setFocusMode(String) 也生效，兼容一下
            camera.Call("setFocusMode", modeName);
        }

        /// <summary>
        /// AutoFocusCallback 的 C# 实现（AndroidJavaProxy）
        /// </summary>
        private class AutoFocusCallbackProxy : AndroidJavaProxy
        {
            private readonly ScanQRcode _owner;
            public AutoFocusCallbackProxy(ScanQRcode owner) : base("android.hardware.Camera$AutoFocusCallback")
            {
                _owner = owner;
            }

            // Java 签名: void onAutoFocus(boolean success, Camera camera)
            public void onAutoFocus(bool success, AndroidJavaObject camera)
            {
                try
                {
                    if (_owner != null && _owner.androidFocusControlAvailable && _owner.androidCameraInstance != null)
                    {
                        _owner.SetCameraFocusMode(_owner.androidCameraInstance, "FOCUS_MODE_CONTINUOUS_PICTURE");
                    }
                }
                catch { }
            }
        }
#endif

        private Texture2D previewTexture;
        
        /// <summary>
        /// 从相机画面裁切并旋转，生成预览画面
        /// 支持中心裁切放大：只截取画面中心区域，放大到预览尺寸
        /// 性能优化：按行复用 float 增量，避免重复乘法
        /// </summary>
        private void CutAndRotateCameraFrame(int camW, int camH, int targetW, int targetH)
        {
            // 计算中心裁切区域大小
            int sourceCropH = Mathf.Max(1, Mathf.RoundToInt(targetH * centerCropRatio));
            int sourceCropW = Mathf.Max(1, Mathf.RoundToInt(targetW * centerCropRatio));
            int cropY = (camW - sourceCropH) / 2;
            int cropX = (camH - sourceCropW) / 2;

            // 两个方向缩放一致，保证不变形
            float scale = centerCropRatio;

            // 获取相机像素数据
            Color32[] cameraPixels = webCamTexture.GetPixels32();
            Color32[] targetPixels = new Color32[targetW * targetH];

            // 顺时针旋转90度 + 中心裁切 + 缩放
            for (int y = 0; y < targetH; y++)
            {
                float srcXBase = cropY + (targetH - 1 - y) * scale; // 整行的 srcX
                float srcYBase = cropX;                              // 起始 srcY

                int rowStart = y * targetW;
                for (int x = 0; x < targetW; x++)
                {
                    float srcX = srcXBase;
                    float srcY = srcYBase + x * scale;

                    int sx = (int)srcX;
                    int sy = (int)srcY;
                    float fx = srcX - sx;
                    float fy = srcY - sy;
                    int sx1 = Mathf.Min(sx + 1, camW - 1);
                    int sy1 = Mathf.Min(sy + 1, camH - 1);

                    int idx00 = sy * camW + sx;
                    int idx10 = sy * camW + sx1;
                    int idx01 = sy1 * camW + sx;
                    int idx11 = sy1 * camW + sx1;

                    Color32 c00 = cameraPixels[idx00];
                    Color32 c10 = cameraPixels[idx10];
                    Color32 c01 = cameraPixels[idx01];
                    Color32 c11 = cameraPixels[idx11];

                    float r = (1-fx)*(1-fy)*c00.r + fx*(1-fy)*c10.r + (1-fx)*fy*c01.r + fx*fy*c11.r;
                    float g = (1-fx)*(1-fy)*c00.g + fx*(1-fy)*c10.g + (1-fx)*fy*c01.g + fx*fy*c11.g;
                    float b = (1-fx)*(1-fy)*c00.b + fx*(1-fy)*c10.b + (1-fx)*fy*c01.b + fx*fy*c11.b;

                    targetPixels[rowStart + x] = new Color32(
                        (byte)Mathf.Clamp(r, 0, 255),
                        (byte)Mathf.Clamp(g, 0, 255),
                        (byte)Mathf.Clamp(b, 0, 255),
                        255
                    );
                }
            }

            // 设置像素到预览纹理
            previewTexture.SetPixels32(targetPixels);
            previewTexture.Apply();
        }

        [SerializeField] private float previewUpdateInterval = 0.03f; // 预览更新间隔（20fps）
        
        /// <summary>
        /// 预览更新协程 - 降低更新频率避免卡顿
        /// </summary>
        private IEnumerator PreviewUpdateCoroutine()
        {
            while (isScanning && webCamTexture != null && webCamTexture.isPlaying)
            {
                // 更新预览画面（限制频率）
                if (previewTexture != null)
                {
                    CutAndRotateCameraFrame(webCamTexture.width, webCamTexture.height, previewTexture.width, previewTexture.height);
                }
                yield return new WaitForSeconds(previewUpdateInterval);
            }
        }

        /// <summary>
        /// 扫描协程
        /// </summary>
        private IEnumerator ScanCoroutine()
        {
            // 等待一帧确保摄像头已准备好
            yield return null;

            while (isScanning && webCamTexture != null && webCamTexture.isPlaying)
            {
                // 避免同时处理多帧
                if (isProcessing)
                {
                    yield return null;
                    continue;
                }

                isProcessing = true;

                // 使用预览纹理进行扫描
                if (previewTexture != null)
                {
                    // 异步解析二维码以避免卡顿
                    if (useAsyncScan)
                    {
                        // 直接获取 RGB24 原始字节，无需手动转换
                        var rawData = previewTexture.GetRawTextureData<byte>();
                        byte[] rgbBytes = rawData.ToArray();
                        int texWidth = previewTexture.width;
                        int texHeight = previewTexture.height;

                        string result = null;
                        bool scanComplete = false;

                        // 在后台线程执行 ZXing 解码（纯计算，不涉及 Unity API）
                        System.Threading.ThreadPool.QueueUserWorkItem(_ =>
                        {
                            try
                            {
                                result = DecodeQRCodeFromBytes(rgbBytes, texWidth, texHeight);
                            }
                            catch (Exception e)
                            {
                                Debug.LogError($"[ScanQRcode] 解码异常: {e.Message}");
                            }
                            finally
                            {
                                scanComplete = true;
                            }
                        });

                        // 等待解码完成
                        yield return new WaitUntil(() => scanComplete);

                        // 处理结果
                        if (!string.IsNullOrEmpty(result))
                        {
                            ProcessScanResult(result);
                        }
                    }
                    else
                    {
                        // 同步解码
                        string result = DecodeQRCode(previewTexture);

                        if (!string.IsNullOrEmpty(result))
                        {
                            ProcessScanResult(result);
                        }
                    }
                }

                isProcessing = false;
                yield return new WaitForSeconds(scanInterval);
            }
        }

        /// <summary>
        /// 处理扫描结果
        /// </summary>
        private void ProcessScanResult(string result)
        {
            Debug.Log($"扫描结果：   {result}");
            // 根据扫描类型处理结果
            if (scanType == ScanType.ConnectDevice)
            {
                // 从结果中提取 MAC 地址
                string macAddress = ExtractMacAddress(result);
                if (!string.IsNullOrEmpty(macAddress))
                {
                    // 扫描成功，仅回传 MAC 地址
                    OnQRCodeScanned?.Invoke(macAddress);
                    OnQRCodeScanned-=OnQRCodeScanned;
                }
                else
                {
                    // 二维码不符合要求，显示提示
                    UpdateStatus("100084");
                }
            }
            else
            {
                if (!string.IsNullOrEmpty(result))
                {
                    // 其他用途，直接回传结果
                    OnQRCodeScanned?.Invoke(result);
                }
                else
                {
                    // 二维码不符合要求，显示提示
                    UpdateStatus("100084");
                }
            }
        }

        /// <summary>
        /// 获取摄像头当前帧
        /// </summary>
        private Texture2D GetSnapshot()
        {
            if (webCamTexture == null || !webCamTexture.isPlaying) return null;

            try
            {
                Texture2D snapshot = new Texture2D(webCamTexture.width, webCamTexture.height);
                snapshot.SetPixels(webCamTexture.GetPixels());
                snapshot.Apply();

                return snapshot;
            }
            catch
            {
                return null;
            }
        }
        
        /// <summary>
        /// 放大纹理（使用双线性插值）- 优化版本
        /// </summary>
        private Texture2D UpscaleTexture(Texture2D source, float factor)
        {
            // 限制放大倍数，避免过度消耗性能
            factor = Mathf.Clamp(factor, 1f, 3f);
            
            int newWidth = Mathf.RoundToInt(source.width * factor);
            int newHeight = Mathf.RoundToInt(source.height * factor);
            
            // 限制最大尺寸，避免内存问题
            newWidth = Mathf.Min(newWidth, 1280);
            newHeight = Mathf.Min(newHeight, 720);
            
            // 如果尺寸没有变化，直接返回原图
            if (newWidth <= source.width || newHeight <= source.height)
            {
                return source;
            }
            
            Texture2D result = new Texture2D(newWidth, newHeight, TextureFormat.RGB24, false);
            
            // 使用 RenderTexture 进行高质量缩放
            RenderTexture rt = RenderTexture.GetTemporary(newWidth, newHeight, 0, RenderTextureFormat.RGB565);
            RenderTexture.active = rt;

            Graphics.Blit(source, rt);
            result.ReadPixels(new Rect(0, 0, newWidth, newHeight), 0, 0);
            result.Apply();

            RenderTexture.active = null;
            RenderTexture.ReleaseTemporary(rt);

            // 销毁原始纹理
            Destroy(source);

            return result;
        }

        /// <summary>
        /// 解析二维码
        /// </summary>
        private string DecodeQRCode(Texture2D texture)
        {
            try
            {
                // 全图扫描
                string result = TryDecodeRegion(texture, 0, 0, texture.width, texture.height);
                if (!string.IsNullOrEmpty(result))
                    return result;
                
                return null;
            }
            catch (Exception ex)
            {
                Debug.LogError($"二维码解析失败: {ex.Message}");
                return null;
            }
        }

        /// <summary>
        /// 从原始字节数据解析二维码（不依赖 Unity API，可在后台线程调用）
        /// </summary>
        private string DecodeQRCodeFromBytes(byte[] rgbBytes, int width, int height)
        {
            try
            {
                var luminanceSource = new ZXing.RGBLuminanceSource(rgbBytes, width, height);
                string result = TryDecodeWithBinarizer(luminanceSource);
                if (!string.IsNullOrEmpty(result))
                    return result;

                return null;
            }
            catch (Exception ex)
            {
                Debug.LogError($"二维码解析失败: {ex.Message}");
                return null;
            }
        }
        
      
        
        /// <summary>
        /// 尝试解码指定区域
        /// </summary>
        private string TryDecodeRegion(Texture2D texture, int startX, int startY, int width, int height)
        {
            try
            {
                // 确保区域在有效范围内
                startX = Mathf.Max(0, startX);
                startY = Mathf.Max(0, startY);
                width = Mathf.Min(width, texture.width - startX);
                height = Mathf.Min(height, texture.height - startY);

                // 获取全图像素数据
                Color32[] allPixels = texture.GetPixels32();
                
                // 提取指定区域的像素
                Color32[] regionPixels = new Color32[width * height];
                for (int y = 0; y < height; y++)
                {
                    for (int x = 0; x < width; x++)
                    {
                        int srcIndex = (startY + y) * texture.width + (startX + x);
                        int dstIndex = y * width + x;
                        if (srcIndex < allPixels.Length)
                        {
                            regionPixels[dstIndex] = allPixels[srcIndex];
                        }
                    }
                }

                // 转换为 RGB 字节数组（ZXing 内部会自动处理灰度转换）
                byte[] rgbBytes = new byte[regionPixels.Length * 3];
                for (int i = 0; i < regionPixels.Length; i++)
                {
                    rgbBytes[i * 3] = regionPixels[i].r;
                    rgbBytes[i * 3 + 1] = regionPixels[i].g;
                    rgbBytes[i * 3 + 2] = regionPixels[i].b;
                }

                // 使用 RGBLuminanceSource，让 ZXing 内部处理灰度转换
                var luminanceSource = new ZXing.RGBLuminanceSource(rgbBytes, width, height);

                // 尝试解码
                string result = TryDecodeWithBinarizer(luminanceSource);
                if (!string.IsNullOrEmpty(result))
                    return result;

                return null;
            }
            catch
            {
                return null;
            }
        }
        
        /// <summary>
        /// 尝试使用不同的二值化算法解码
        /// </summary>
        private string TryDecodeWithBinarizer(ZXing.LuminanceSource luminanceSource)
        {
            var hints = new Dictionary<ZXing.DecodeHintType, object>
            {
                { ZXing.DecodeHintType.TRY_HARDER, true },
                { ZXing.DecodeHintType.POSSIBLE_FORMATS, new List<ZXing.BarcodeFormat> { ZXing.BarcodeFormat.QR_CODE } }
            };
            
            var reader = new ZXing.QrCode.QRCodeReader();
            
            // 尝试 HybridBinarizer
            try
            {
                var binarizer = new ZXing.Common.HybridBinarizer(luminanceSource);
                var binaryBitmap = new ZXing.BinaryBitmap(binarizer);
                var result = reader.decode(binaryBitmap, hints);
                if (result != null)
                    return result.Text;
            }
            catch { }
            
            // 尝试 GlobalHistogramBinarizer
            try
            {
                var binarizer = new ZXing.Common.GlobalHistogramBinarizer(luminanceSource);
                var binaryBitmap = new ZXing.BinaryBitmap(binarizer);
                var result = reader.decode(binaryBitmap, hints);
                if (result != null)
                    return result.Text;
            }
            catch { }
            
            return null;
        }
        
        /// <summary>
        /// 应用锐化滤镜（拉普拉斯算子）
        /// 增强图像边缘，提高模糊二维码识别率
        /// </summary>
        private byte[] ApplySharpenFilter(byte[] input, int width, int height)
        {
            byte[] output = new byte[input.Length];
            
            // 拉普拉斯锐化核
            //  0 -1  0
            // -1  5 -1
            //  0 -1  0
            int[] kernel = { 0, -1, 0, -1, 5, -1, 0, -1, 0 };
            int kernelSize = 3;
            int halfKernel = kernelSize / 2;
            
            for (int y = 0; y < height; y++)
            {
                for (int x = 0; x < width; x++)
                {
                    int sum = 0;
                    
                    // 应用卷积核
                    for (int ky = -halfKernel; ky <= halfKernel; ky++)
                    {
                        for (int kx = -halfKernel; kx <= halfKernel; kx++)
                        {
                            int py = Mathf.Clamp(y + ky, 0, height - 1);
                            int px = Mathf.Clamp(x + kx, 0, width - 1);
                            
                            int pixelIndex = py * width + px;
                            int kernelIndex = (ky + halfKernel) * kernelSize + (kx + halfKernel);
                            
                            sum += input[pixelIndex] * kernel[kernelIndex];
                        }
                    }
                    
                    // 限制在0-255范围内
                    output[y * width + x] = (byte)Mathf.Clamp(sum, 0, 255);
                }
            }
            
            return output;
        }

        /// <summary>
        /// 从字符串中提取 MAC 地址
        /// 支持格式：
        /// 1. 带冒号格式：98:EA:A0:02:4E:06
        /// 2. 不带冒号格式：98eaa002658e
        /// 3. 从键值对格式提取：Name:xxx;MAC:98eaa002658e
        /// </summary>
        private string ExtractMacAddress(string input)
        {
            if (string.IsNullOrEmpty(input))
                return null;

            string macAddress = null;

            // 尝试从键值对格式提取 MAC:xxx
            // 匹配 MAC: 后面跟着 12 位十六进制字符（可能带冒号或不带）
            System.Text.RegularExpressions.Regex macKeyValueRegex = 
                new System.Text.RegularExpressions.Regex(@"MAC:([0-9A-Fa-f]{2}:?[0-9A-Fa-f]{2}:?[0-9A-Fa-f]{2}:?[0-9A-Fa-f]{2}:?[0-9A-Fa-f]{2}:?[0-9A-Fa-f]{2})");
            
            System.Text.RegularExpressions.Match kvMatch = macKeyValueRegex.Match(input);
            if (kvMatch.Success)
            {
                macAddress = kvMatch.Groups[1].Value;
            }
            else
            {
                // 尝试匹配带冒号的标准 MAC 格式
                System.Text.RegularExpressions.Regex macColonRegex = 
                    new System.Text.RegularExpressions.Regex(@"[0-9A-Fa-f]{2}:[0-9A-Fa-f]{2}:[0-9A-Fa-f]{2}:[0-9A-Fa-f]{2}:[0-9A-Fa-f]{2}:[0-9A-Fa-f]{2}");
                
                System.Text.RegularExpressions.Match colonMatch = macColonRegex.Match(input);
                if (colonMatch.Success)
                {
                    macAddress = colonMatch.Value;
                }
                else
                {
                    // 尝试匹配不带冒号的 12 位十六进制字符
                    System.Text.RegularExpressions.Regex macNoColonRegex = 
                        new System.Text.RegularExpressions.Regex(@"[0-9A-Fa-f]{12}");
                    
                    System.Text.RegularExpressions.Match noColonMatch = macNoColonRegex.Match(input);
                    if (noColonMatch.Success)
                    {
                        macAddress = noColonMatch.Value;
                    }
                }
            }

            if (!string.IsNullOrEmpty(macAddress))
            {
                // 统一转换为带冒号的大写格式
                return FormatMacAddress(macAddress);
            }

            return null;
        }

        /// <summary>
        /// 将 MAC 地址统一格式化为带冒号的大写格式
        /// 输入: 98eaa002658e 或 98:EA:A0:02:65:8E
        /// 输出: 98:EA:A0:02:65:8E
        /// </summary>
        private string FormatMacAddress(string mac)
        {
            if (string.IsNullOrEmpty(mac))
                return null;

            // 移除所有冒号
            string cleanMac = mac.Replace(":", "").Replace("-", "").ToUpper();

            // 检查长度是否为 12
            if (cleanMac.Length != 12)
                return null;

            // 格式化为 XX:XX:XX:XX:XX:XX
            return string.Format("{0}:{1}:{2}:{3}:{4}:{5}",
                cleanMac.Substring(0, 2),
                cleanMac.Substring(2, 2),
                cleanMac.Substring(4, 2),
                cleanMac.Substring(6, 2),
                cleanMac.Substring(8, 2),
                cleanMac.Substring(10, 2));
        }

        /// <summary>
        /// 更新状态文字
        /// </summary>
        private void UpdateStatus(string code)
        {
           ToastUI.Show(code);
        }

        void OnDestroy()
        {
            StopScan();
            gameObject.SetActive(false);
        }
    }
}