using System;
using System.Collections;
using System.Collections.Generic;
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 = 0.2f; // 扫描间隔（秒）
        public ScanType scanType = ScanType.ConnectDevice; // 扫描类型
        
        [Header("小二维码优化")]
        [Tooltip("启用图像放大（推荐用于小二维码）")]
        public bool enableUpscale = true;
        [Tooltip("放大倍数")]
        public float upscaleFactor = 2f;
        
        [Header("性能优化")]
        [Tooltip("降低扫描分辨率（推荐值：640或480）")]
        public int scanResolutionWidth = 1080;
        [Tooltip("扫描处理线程数")]
        public bool useAsyncScan = true;
        
        [Header("自动对焦")]
        [Tooltip("启用自动对焦")]
        public bool enableAutoFocus = true;
        [Tooltip("对焦间隔（秒）")]
        public float focusInterval = 1f;
        // 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();
        }

        /// <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;
            }
        }

        /// <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>();
            // 使用较低的扫描分辨率以提高性能
            int targetWidth = 2160;
            
            // 创建摄像头纹理
            webCamTexture = new WebCamTexture(deviceName, targetWidth, 30);

            // 开始播放
            webCamTexture.Play();

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

        /// <summary>
        /// 调整预览画面比例 - 从相机画面中心截取最大适合预览画面比例的画面
        /// 手机竖着拿，摄像头默认横向输出，需要旋转并截取中间区域
        /// 预览框是横向的（1080x680），显示旋转后的竖向画面
        /// </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 1920x1080）
            int cameraWidth = webCamTexture.width;   // 1920
            int cameraHeight = webCamTexture.height; // 1080
            
            // 获取预览区域尺寸（横向预览框，比如 1080x680）
            RectTransform previewRect = cameraPreview.GetComponent<RectTransform>();
            int previewWidth = (int)previewRect.rect.width;   // 1080
            int previewHeight = (int)previewRect.rect.height; // 680
            
            // 创建预览纹理（与预览框相同尺寸）
            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
            // 手机竖着拿，相机横向输出，需要顺时针旋转90度
            // 从相机画面中间截取适合预览比例的竖向区域
            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}");
        }
        
        private Texture2D previewTexture;
        
        /// <summary>
        /// 从相机画面裁切并旋转，生成预览画面
        /// </summary>
        private void CutAndRotateCameraFrame(int camW, int camH, int targetW, int targetH)
        {
            // 相机横向 1920x1080，需要顺时针旋转90度变成 1080x1920
            // 预览框横向 1080x680
            // 从旋转后的 1080x1920 中截取中间 1080x680 区域
            
            // 计算裁切区域（在原始相机画面上的坐标）
            // 旋转后高度是 camW(1920)，需要截取 targetH(680) 高度
            // 从中间截取：起始Y = (1920 - 680) / 2 = 620
            int cropY = (camW - targetH) / 2; // 620
            
            // 获取相机像素数据
            Color32[] cameraPixels = webCamTexture.GetPixels32();
            Color32[] targetPixels = new Color32[targetW * targetH];
            
            // 顺时针旋转90度并裁切
            // 原始坐标 (x, y) -> 顺时针旋转90度后 (y, camW-1-x)
            // 目标 (x, y) 对应源：
            //   srcX = cropY + y (在裁切区域内纵向移动)
            //   srcY = x (横向直接对应，不翻转)
            for (int y = 0; y < targetH; y++)
            {
                for (int x = 0; x < targetW; x++)
                {
                    // 目标像素在预览图中的位置 (x, y)
                    // 对应原始相机中的位置
                    int srcX = cropY + (targetH - 1 - y);  // 从裁切区域底部开始，向上取像素（修复上下颠倒）
                    int srcY = x;                          // 横向直接对应
                    
                    if (srcX >= 0 && srcX < camW && srcY >= 0 && srcY < camH)
                    {
                        int srcIndex = srcY * camW + srcX;
                        int dstIndex = y * targetW + x;
                        targetPixels[dstIndex] = cameraPixels[srcIndex];
                    }
                }
            }
            
            // 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)
                    {
                        string result = null;
                        bool scanComplete = false;

                        // 在后台线程执行解码
                        System.Threading.ThreadPool.QueueUserWorkItem(_ =>
                        {
                            try
                            {
                                result = DecodeQRCode(previewTexture);
                            }
                            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();
                
                // // 如果启用放大，对图像进行放大处理
                // if (enableUpscale && upscaleFactor > 1f)
                // {
                //     snapshot = UpscaleTexture(snapshot, upscaleFactor);
                // }
                
                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>
        /// 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);
        }
    }
}