using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using OrpaonVision.Core.Results;
using OrpaonVision.SiteApp.Runtime.Contracts;
using OrpaonVision.SiteApp.Runtime.Services;
using System.Collections.Concurrent;

namespace OrpaonVision.SiteApp.Runtime.Services;

/// <summary>
/// 海康相机服务实现。
/// 注意：这是一个模拟实现，实际使用时需要替换为海康相机SDK的真实调用。
/// </summary>
public sealed class HikCameraService : IHikCameraService, IDisposable
{
    private readonly ILogger<HikCameraService> _logger;
    private readonly HikCameraOptions _options;
    private readonly object _lockObject = new();
    private HikCameraDevice? _currentDevice;
    private bool _isConnected;
    private bool _isGrabbing;
    private Timer? _simulationTimer;
    private readonly ConcurrentQueue<byte[]> _frameQueue = new();
    private int _frameCounter;

    /// <summary>
    /// 构造函数。
    /// </summary>
    public HikCameraService(ILogger<HikCameraService> logger, IOptions<HikCameraOptions> options)
    {
        _logger = logger;
        _options = options.Value;
        _logger.LogInformation("海康相机服务已初始化（模拟模式）");
    }

    /// <inheritdoc />
    public Result<IReadOnlyList<HikCameraDevice>> EnumerateDevices()
    {
        try
        {
            _logger.LogInformation("正在枚举海康相机设备...");

            // 模拟设备枚举 - 实际实现需要调用海康SDK的MV_CC_EnumDevices等函数
            var devices = new List<HikCameraDevice>
            {
                new()
                {
                    SerialNumber = "HK0012345678",
                    DeviceName = "模拟海康相机1",
                    IpAddress = "192.168.1.100",
                    SubnetMask = "255.255.255.0",
                    DefaultGateway = "192.168.1.1",
                    MacAddress = "00:11:22:33:44:55",
                    FirmwareVersion = "V2.1.0",
                    IsConnected = false
                },
                new()
                {
                    SerialNumber = "HK0087654321",
                    DeviceName = "模拟海康相机2",
                    IpAddress = "192.168.1.101",
                    SubnetMask = "255.255.255.0",
                    DefaultGateway = "192.168.1.1",
                    MacAddress = "00:11:22:33:44:66",
                    FirmwareVersion = "V2.1.0",
                    IsConnected = false
                }
            };

            _logger.LogInformation("发现 {Count} 个海康相机设备", devices.Count);
            return Result<IReadOnlyList<HikCameraDevice>>.Success(devices, message: "设备枚举成功。");
        }
        catch (Exception ex)
        {
            var traceId = Guid.NewGuid().ToString("N");
            _logger.LogError(ex, "枚举海康相机设备失败。TraceId: {TraceId}", traceId);
            var result = Result.FromException(ex, "HIK_CAMERA_ENUM_FAILED", "枚举相机设备失败。", traceId);
            return Result<IReadOnlyList<HikCameraDevice>>.FailWithTrace(result.Code, result.Message, result.TraceId ?? traceId, [.. result.Errors]);
        }
    }

    /// <inheritdoc />
    public Result ConnectToDevice(HikCameraDevice device)
    {
        if (device == null)
        {
            return Result.Fail("HIK_CAMERA_DEVICE_NULL", "相机设备不能为空。");
        }

        lock (_lockObject)
        {
            try
            {
                if (_isConnected)
                {
                    return Result.Fail("HIK_CAMERA_ALREADY_CONNECTED", "相机已连接，请先断开。");
                }

                _logger.LogInformation("正在连接相机设备: {SerialNumber}", device.SerialNumber);

                // 模拟连接过程 - 实际实现需要调用海康SDK的MV_CC_CreateHandle、MV_CC_OpenDevice等函数
                Thread.Sleep(500); // 模拟连接延迟

                _currentDevice = new HikCameraDevice
                {
                    SerialNumber = device.SerialNumber,
                    DeviceName = device.DeviceName,
                    IpAddress = device.IpAddress,
                    SubnetMask = device.SubnetMask,
                    DefaultGateway = device.DefaultGateway,
                    MacAddress = device.MacAddress,
                    FirmwareVersion = device.FirmwareVersion,
                    IsConnected = true,
                    ConnectedAt = DateTime.UtcNow
                };
                _isConnected = true;

                _logger.LogInformation("相机连接成功: {SerialNumber}", device.SerialNumber);
                OnConnectionStateChanged?.Invoke(true, $"已连接到 {device.DeviceName}");

                return Result.Success(message: $"相机 {device.DeviceName} 连接成功。");
            }
            catch (Exception ex)
            {
                var traceId = Guid.NewGuid().ToString("N");
                _logger.LogError(ex, "连接相机失败。TraceId: {TraceId}", traceId);
                var result = Result.FromException(ex, "HIK_CAMERA_CONNECT_FAILED", "连接相机失败。", traceId);
                return Result.FailWithTrace(result.Code, result.Message, result.TraceId ?? traceId, result.Errors.ToArray());
            }
        }
    }

    /// <inheritdoc />
    public Result ConnectToDevice(string serialNumberOrIp)
    {
        var devicesResult = EnumerateDevices();
        if (!devicesResult.Succeeded)
        {
            return Result.Fail(devicesResult.Code, devicesResult.Message, devicesResult.Errors.ToArray());
        }

        var targetDevice = devicesResult.Data.FirstOrDefault(d => 
            d.SerialNumber.Equals(serialNumberOrIp, StringComparison.OrdinalIgnoreCase) ||
            d.IpAddress.Equals(serialNumberOrIp, StringComparison.OrdinalIgnoreCase));

        if (targetDevice == null)
        {
            return Result.Fail("HIK_CAMERA_NOT_FOUND", $"未找到序列号或IP为 {serialNumberOrIp} 的相机设备。");
        }

        return ConnectToDevice(targetDevice);
    }

    /// <inheritdoc />
    public Result Disconnect()
    {
        lock (_lockObject)
        {
            try
            {
                if (!_isConnected)
                {
                    return Result.Success(message: "相机未连接。");
                }

                _logger.LogInformation("正在断开相机连接...");

                // 停止采集
                if (_isGrabbing)
                {
                    StopGrabbing();
                }

                // 模拟断开过程 - 实际实现需要调用海康SDK的MV_CC_CloseDevice、MV_CC_DestroyHandle等函数
                Thread.Sleep(100);

                var deviceName = _currentDevice?.DeviceName ?? "未知设备";
                _currentDevice = null;
                _isConnected = false;

                _logger.LogInformation("相机断开连接成功");
                OnConnectionStateChanged?.Invoke(false, $"已断开与 {deviceName} 的连接");

                return Result.Success(message: "相机断开连接成功。");
            }
            catch (Exception ex)
            {
                var traceId = Guid.NewGuid().ToString("N");
                _logger.LogError(ex, "断开相机连接失败。TraceId: {TraceId}", traceId);
                var result = Result.FromException(ex, "HIK_CAMERA_DISCONNECT_FAILED", "断开相机连接失败。", traceId);
                return Result.FailWithTrace(result.Code, result.Message, result.TraceId ?? traceId, result.Errors.ToArray());
            }
        }
    }

    /// <inheritdoc />
    public bool IsConnected => _isConnected;

    /// <inheritdoc />
    public HikCameraDevice? CurrentDevice => _currentDevice;

    /// <inheritdoc />
    public Result SetCameraParameters(int width, int height, string pixelFormat, int triggerMode = 0)
    {
        lock (_lockObject)
        {
            try
            {
                if (!_isConnected)
                {
                    return Result.Fail("HIK_CAMERA_NOT_CONNECTED", "相机未连接。");
                }

                _logger.LogInformation("正在设置相机参数: {Width}x{Height}, {PixelFormat}, TriggerMode: {TriggerMode}", 
                    width, height, pixelFormat, triggerMode);

                // 模拟参数设置 - 实际实现需要调用海康SDK的MV_CC_SetIntValue、MV_CC_SetEnumValue等函数
                Thread.Sleep(100);

                _logger.LogInformation("相机参数设置成功");
                return Result.Success(message: "相机参数设置成功。");
            }
            catch (Exception ex)
            {
                var traceId = Guid.NewGuid().ToString("N");
                _logger.LogError(ex, "设置相机参数失败。TraceId: {TraceId}", traceId);
                var result = Result.FromException(ex, "HIK_CAMERA_SET_PARAMS_FAILED", "设置相机参数失败。", traceId);
                return Result.FailWithTrace(result.Code, result.Message, result.TraceId ?? traceId, result.Errors.ToArray());
            }
        }
    }

    /// <inheritdoc />
    public Result StartGrabbing()
    {
        lock (_lockObject)
        {
            try
            {
                if (!_isConnected)
                {
                    return Result.Fail("HIK_CAMERA_NOT_CONNECTED", "相机未连接。");
                }

                if (_isGrabbing)
                {
                    return Result.Success(message: "相机已在采集中。");
                }

                _logger.LogInformation("正在开始图像采集...");

                // 模拟开始采集 - 实际实现需要调用海康SDK的MV_CC_StartGrabbing函数
                Thread.Sleep(100);

                _isGrabbing = true;
                _frameQueue.Clear();

                // 启动模拟定时器生成图像帧
                _simulationTimer = new Timer(GenerateSimulationFrame, null, TimeSpan.Zero, TimeSpan.FromMilliseconds(33)); // 约30fps

                _logger.LogInformation("图像采集已启动");
                return Result.Success(message: "图像采集启动成功。");
            }
            catch (Exception ex)
            {
                var traceId = Guid.NewGuid().ToString("N");
                _logger.LogError(ex, "启动图像采集失败。TraceId: {TraceId}", traceId);
                var result = Result.FromException(ex, "HIK_CAMERA_START_GRAB_FAILED", "启动图像采集失败。", traceId);
                return Result.FailWithTrace(result.Code, result.Message, result.TraceId ?? traceId, result.Errors.ToArray());
            }
        }
    }

    /// <inheritdoc />
    public Result StopGrabbing()
    {
        lock (_lockObject)
        {
            try
            {
                if (!_isGrabbing)
                {
                    return Result.Success(message: "相机未在采集状态。");
                }

                _logger.LogInformation("正在停止图像采集...");

                // 停止模拟定时器
                _simulationTimer?.Dispose();
                _simulationTimer = null;

                // 模拟停止采集 - 实际实现需要调用海康SDK的MV_CC_StopGrabbing函数
                Thread.Sleep(50);

                _isGrabbing = false;
                _frameQueue.Clear();

                _logger.LogInformation("图像采集已停止");
                return Result.Success(message: "图像采集停止成功。");
            }
            catch (Exception ex)
            {
                var traceId = Guid.NewGuid().ToString("N");
                _logger.LogError(ex, "停止图像采集失败。TraceId: {TraceId}", traceId);
                var result = Result.FromException(ex, "HIK_CAMERA_STOP_GRAB_FAILED", "停止图像采集失败。", traceId);
                return Result.FailWithTrace(result.Code, result.Message, result.TraceId ?? traceId, result.Errors.ToArray());
            }
        }
    }

    /// <inheritdoc />
    public Result TriggerSoftware()
    {
        lock (_lockObject)
        {
            try
            {
                if (!_isConnected)
                {
                    return Result.Fail("HIK_CAMERA_NOT_CONNECTED", "相机未连接。");
                }

                if (!_isGrabbing)
                {
                    return Result.Fail("HIK_CAMERA_NOT_GRABBING", "相机未在采集状态。");
                }

                // 模拟软触发 - 实际实现需要调用海康SDK的MV_CC_SetCommandValue("TriggerSoftware")函数
                _logger.LogDebug("执行软件触发");

                return Result.Success(message: "软件触发执行成功。");
            }
            catch (Exception ex)
            {
                var traceId = Guid.NewGuid().ToString("N");
                _logger.LogError(ex, "软件触发失败。TraceId: {TraceId}", traceId);
                var result = Result.FromException(ex, "HIK_CAMERA_TRIGGER_FAILED", "软件触发失败。", traceId);
                return Result.FailWithTrace(result.Code, result.Message, result.TraceId ?? traceId, result.Errors.ToArray());
            }
        }
    }

    /// <inheritdoc />
    public Result<byte[]> GetLatestFrame()
    {
        try
        {
            if (!_isGrabbing)
            {
                return Result<byte[]>.Fail("HIK_CAMERA_NOT_GRABBING", "相机未在采集状态。");
            }

            if (_frameQueue.TryDequeue(out var frame))
            {
                return Result<byte[]>.Success(frame, message: "获取图像帧成功。");
            }

            return Result<byte[]>.Fail("HIK_CAMERA_NO_FRAME", "暂无可用图像帧。");
        }
        catch (Exception ex)
        {
            var traceId = Guid.NewGuid().ToString("N");
            _logger.LogError(ex, "获取图像帧失败。TraceId: {TraceId}", traceId);
            var result = Result.FromException(ex, "HIK_CAMERA_GET_FRAME_FAILED", "获取图像帧失败。", traceId);
            return Result<byte[]>.FailWithTrace(result.Code, result.Message, result.TraceId ?? traceId, result.Errors.ToArray());
        }
    }

    /// <inheritdoc />
    public Result<CameraFrameDto> GetLatestFrameWithTimestamp()
    {
        var frameResult = GetLatestFrame();
        if (!frameResult.Succeeded)
        {
            return Result<CameraFrameDto>.Fail(frameResult.Code, frameResult.Message, frameResult.Errors.ToArray());
        }

        return Result<CameraFrameDto>.Success(new CameraFrameDto
        {
            Timestamp = DateTime.UtcNow,
            ImageData = frameResult.Data,
            Width = _options.ImageWidth,
            Height = _options.ImageHeight,
            PixelFormat = _options.PixelFormat
        }, message: "获取图像帧成功。");
    }

    /// <inheritdoc />
    public event Action<byte[], DateTime>? OnImageReceived;

    /// <inheritdoc />
    public event Action<bool, string>? OnConnectionStateChanged;

    /// <summary>
    /// 生成模拟图像帧。
    /// </summary>
    private void GenerateSimulationFrame(object? state)
    {
        try
        {
            // 生成模拟图像数据（BGR格式）
            var width = _options.ImageWidth;
            var height = _options.ImageHeight;
            var frameSize = width * height * 3; // BGR8Packed
            var frameData = new byte[frameSize];

            // 填充模拟图像数据（简单的渐变图案）
            var random = new Random(_frameCounter++);
            for (int i = 0; i < frameSize; i += 3)
            {
                frameData[i] = (byte)(i % 256);       // B
                frameData[i + 1] = (byte)((i / 3) % 256); // G  
                frameData[i + 2] = (byte)random.Next(256);  // R
            }

            var timestamp = DateTime.UtcNow;

            // 添加到队列
            if (_frameQueue.Count < 10) // 限制队列大小防止内存溢出
            {
                _frameQueue.Enqueue(frameData);
            }

            // 触发事件
            OnImageReceived?.Invoke(frameData, timestamp);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "生成模拟图像帧失败");
        }
    }

    /// <summary>
    /// 释放资源。
    /// </summary>
    public void Dispose()
    {
        try
        {
            Disconnect();
            _simulationTimer?.Dispose();
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "释放海康相机服务资源时发生异常");
        }
    }
}