using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using EasyIDSDK_Net;

namespace LB_VisionProcesses.BarcodeReaders.Huayray
{
    /// <summary>
    /// 华睿读码器实现类
    /// </summary>
    public class HRBarcodeReader : BarcodeReaderBase
    {
        private EidCamera _camera;
        private EidCamera.EidFrameCallback _frameCallback;
        private GCHandle _callbackHandle;

        public override BarcodeReaderBrand Brand => BarcodeReaderBrand.Huayray;

        public HRBarcodeReader()
        {
            _camera = new EidCamera();
            _frameCallback = OnFrameReceived;
        }

        /// <summary>
        /// 获取在线的华睿读码器列表
        /// </summary>
        public override List<string> GetDeviceList()
        {
            List<string> snList = new List<string>();
            try
            {
                EidCamera.EidDeviceList devList = new EidCamera.EidDeviceList();
                int nRet = EidCamera.eidEnumDevices_Net(ref devList, 0);
                if (nRet == EidCamera.eidErrorOK && devList.num > 0)
                {
                    for (int i = 0; i < devList.num; i++)
                    {
                        EidCamera.EidDeviceInfo deviceInfo = (EidCamera.EidDeviceInfo)Marshal.PtrToStructure(
                            devList.infos + Marshal.SizeOf(typeof(EidCamera.EidDeviceInfo)) * i,
                            typeof(EidCamera.EidDeviceInfo));
                        snList.Add(deviceInfo.serialNumber);
                    }
                }
            }
            catch (Exception ex)
            {
                // TODO: Log error
            }
            return snList;
        }

        public override bool Open(string sn)
        {
            if (IsConnected) Close();

            try
            {
                // 先进行一次枚举，确保 SDK 能够发现设备（部分 SDK 要求在打开前必须执行枚举）
                GetDeviceList();

                // 如果之前失败过，重新创建相机对象确保干净状态
                if (_camera == null)
                {
                    _camera = new EidCamera();
                }

                // 确保之前的句柄已释放
                try { _camera.eidReleaseHandle_Net(); } catch { }

                // 创建句柄
                int nRet = _camera.eidCreateDevice_Net(sn, EidCamera.EidDeviceDataType.eidDeviceDataTypeSN);
                if (nRet != EidCamera.eidErrorOK)
                {
                    _camera = null;
                    return false;
                }

                // 分配固定句柄给委托，防止被 GC 回收
                if (!_callbackHandle.IsAllocated)
                {
                    _callbackHandle = GCHandle.Alloc(_frameCallback);
                }

                // 打开设备
                nRet = _camera.eidOpenDevice_Net();
                if (nRet != EidCamera.eidErrorOK)
                {
                    _camera.eidReleaseHandle_Net();
                    if (_callbackHandle.IsAllocated) _callbackHandle.Free();
                    _camera = null;
                    return false;
                }

                // 注册回调
                nRet = _camera.eidRegisterFrameCallback_Net(_frameCallback, IntPtr.Zero);
                if (nRet != EidCamera.eidErrorOK)
                {
                    _camera.eidCloseDevice_Net();
                    _camera.eidReleaseHandle_Net();
                    if (_callbackHandle.IsAllocated) _callbackHandle.Free();
                    _camera = null;
                    return false;
                }

                this.SN = sn;
                this.IsConnected = true;
                return true;
            }
            catch
            {
                // 发生异常时确保释放资源
                try { _camera?.eidCloseDevice_Net(); } catch { }
                try { _camera?.eidReleaseHandle_Net(); } catch { }
                if (_callbackHandle.IsAllocated) _callbackHandle.Free();
                // 发生异常时释放相机对象，确保下次创建新实例
                _camera = null;
                return false;
            }
        }

        public override bool Close()
        {
            try
            {
                if (IsConnected)
                {
                    StopGrabbing();
                    _camera?.eidCloseDevice_Net();
                }
                // 无论是否连接，都尝试释放句柄
                _camera?.eidReleaseHandle_Net();

                // 释放回调句柄
                if (_callbackHandle.IsAllocated)
                {
                    _callbackHandle.Free();
                }

                // 释放相机对象引用，确保SDK资源完全释放
                _camera = null;

                this.IsConnected = false;
                this.IsGrabbing = false;
                return true;
            }
            catch
            {
                return false;
            }
        }

        public override bool StartGrabbing()
        {
            if (!IsConnected) return false;
            if (IsGrabbing) return true;

            int nRet = _camera.eidStartGrabbing_Net(0);
            if (nRet == EidCamera.eidErrorOK)
            {
                this.IsGrabbing = true;
                return true;
            }
            return false;
        }

        public override bool StopGrabbing()
        {
            if (!IsGrabbing) return true;

            int nRet = _camera.eidStopGrabbing_Net();
            this.IsGrabbing = false;
            return nRet == EidCamera.eidErrorOK;
        }

        public override bool SoftTrigger()
        {
            if (!IsConnected || !IsGrabbing) return false;
            int nRet = _camera.eidExecCommandFeature_Net("TriggerSoftware");
            return nRet == EidCamera.eidErrorOK;
        }

        public override bool SetTriggerMode(bool isSoftware)
        {
            if (!IsConnected) return false;

            int nRet;
            if (isSoftware)
            {
                // 软触发模式
                nRet = _camera.eidSetEnumFeatureSymbol_Net("TriggerType", "SingleFrame");
                if (nRet != EidCamera.eidErrorOK) return false;
                nRet = _camera.eidSetEnumFeatureSymbol_Net("TriggerSource", "Software");
            }
            else
            {
                // 自由运行或硬触发 (此处默认设为自由运行，可根据需要扩展)
                nRet = _camera.eidSetEnumFeatureSymbol_Net("TriggerType", "FreeRun");
            }
            return nRet == EidCamera.eidErrorOK;
        }

        /// <summary>
        /// SDK帧回调处理
        /// </summary>
        private void OnFrameReceived(ref EidCamera.EidFrameInfo frameInfo, IntPtr userData)
        {
            try
            {
                List<BarcodeInfo> barcodeInfos = new List<BarcodeInfo>();
                // 解析条码
                for (int i = 0; i < frameInfo.codeNum; i++)
                {
                    EidCamera.EidCodeInfo codeInfo = (EidCamera.EidCodeInfo)Marshal.PtrToStructure(
                        frameInfo.codeList + Marshal.SizeOf(typeof(EidCamera.EidCodeInfo)) * i,
                        typeof(EidCamera.EidCodeInfo));
                    
                    string data = Marshal.PtrToStringAnsi(codeInfo.data);
                    if (!string.IsNullOrEmpty(data))
                    {
                        BarcodeInfo info = new BarcodeInfo
                        {
                            Text = data,
                            Points = new Point[]
                            {
                                new Point((int)codeInfo.position[0].x, (int)codeInfo.position[0].y),
                                new Point((int)codeInfo.position[1].x, (int)codeInfo.position[1].y),
                                new Point((int)codeInfo.position[2].x, (int)codeInfo.position[2].y),
                                new Point((int)codeInfo.position[3].x, (int)codeInfo.position[3].y)
                            }
                        };
                        barcodeInfos.Add(info);
                    }
                }

                // 转换图像
                Bitmap bitmap = null;
                if (frameInfo.imageDataLen > 0 && frameInfo.imageData != IntPtr.Zero)
                {
                    if (frameInfo.isJpeg)
                    {
                        byte[] managedArray = new byte[frameInfo.imageDataLen];
                        Marshal.Copy(frameInfo.imageData, managedArray, 0, (int)frameInfo.imageDataLen);
                        using (var ms = new System.IO.MemoryStream(managedArray))
                        {
                            bitmap = new Bitmap(ms);
                        }
                    }
                }

                // 触发事件
                OnBarcodeRead(new BarcodeEventArgs(this.SN, barcodeInfos, bitmap));
            }
            catch (Exception ex)
            {
                // TODO: Log error
            }
        }

        public override void Dispose()
        {
            Close();
            base.Dispose();
        }
    }
}