using DeviceAgent.Services;
using Microsoft.Extensions.Options;

namespace DeviceAgent;

public class Worker : BackgroundService
{
    private readonly ILogger<Worker> _logger;
    private readonly DeviceInfoService _deviceInfoService;
    private readonly ReportService _reportService;
    private readonly ScreenCaptureService _screenCaptureService;
    private readonly ScreenStreamService _screenStreamService;
    private readonly RemoteDesktopService _remoteDesktopService;
    private readonly AgentConfig _config;
    
    private string? _cachedUuid;
    private int _heartbeatCounter = 0;
    private int _screenshotCounter = 0;

    public Worker(
        ILogger<Worker> logger,
        DeviceInfoService deviceInfoService,
        ReportService reportService,
        ScreenCaptureService screenCaptureService,
        ScreenStreamService screenStreamService,
        RemoteDesktopService remoteDesktopService,
        IOptions<AgentConfig> config)
    {
        _logger = logger;
        _deviceInfoService = deviceInfoService;
        _reportService = reportService;
        _screenCaptureService = screenCaptureService;
        _screenStreamService = screenStreamService;
        _remoteDesktopService = remoteDesktopService;
        _config = config.Value;
    }

    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        _logger.LogInformation("DeviceAgent 服务已启动");
        _logger.LogInformation("服务器地址: {ServerUrl}", _config.ServerUrl);
        _logger.LogInformation("上报间隔: {Interval} 秒", _config.ReportIntervalSeconds);
        _logger.LogInformation("屏幕截图: {Enabled}", _config.ScreenCaptureEnabled ? "启用" : "禁用");
        _logger.LogInformation("实时屏幕流: {Enabled}", _config.ScreenStreamEnabled ? "启用" : "禁用");
        _logger.LogInformation("自动开启远程桌面: {Enabled}", _config.EnableRemoteDesktopOnStart ? "启用" : "禁用");

        // 自动开启远程桌面
        if (_config.EnableRemoteDesktopOnStart)
        {
            EnableRemoteDesktopOnStartup();
        }

        // 启动实时屏幕流服务（在后台任务中）
        Task? screenStreamTask = null;
        if (_config.ScreenStreamEnabled)
        {
            screenStreamTask = Task.Run(() => _screenStreamService.StartAsync(stoppingToken), stoppingToken);
            // 等待一小段时间让服务启动
            await Task.Delay(500, stoppingToken);
        }

        // 启动时立即上报一次完整信息
        await ReportFullInfoAsync();

        while (!stoppingToken.IsCancellationRequested)
        {
            try
            {
                _heartbeatCounter++;
                _screenshotCounter++;
                
                // 每10次心跳上报一次完整信息，其他时候只发心跳
                if (_heartbeatCounter >= 10)
                {
                    await ReportFullInfoAsync();
                    _heartbeatCounter = 0;
                }
                else if (!string.IsNullOrEmpty(_cachedUuid))
                {
                    await _reportService.SendHeartbeatAsync(_cachedUuid);
                }

                // 屏幕截图上传（根据配置的间隔）- 已禁用，改用实时流
                if (_config.ScreenCaptureEnabled && !string.IsNullOrEmpty(_cachedUuid))
                {
                    var screenshotInterval = _config.ScreenCaptureIntervalSeconds / _config.ReportIntervalSeconds;
                    if (_screenshotCounter >= screenshotInterval)
                    {
                        await UploadScreenshotAsync();
                        _screenshotCounter = 0;
                    }
                }

                await Task.Delay(TimeSpan.FromSeconds(_config.ReportIntervalSeconds), stoppingToken);
            }
            catch (OperationCanceledException)
            {
                break;
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "工作循环发生异常");
                await Task.Delay(TimeSpan.FromSeconds(30), stoppingToken);
            }
        }

        // 停止屏幕流服务
        if (_config.ScreenStreamEnabled)
        {
            await _screenStreamService.StopAsync();
        }

        _logger.LogInformation("DeviceAgent 服务已停止");
    }

    private void EnableRemoteDesktopOnStartup()
    {
        try
        {
            if (_remoteDesktopService.IsRemoteDesktopEnabled())
            {
                _logger.LogInformation("远程桌面已启用，端口: {Port}", _remoteDesktopService.GetRdpPort());
            }
            else
            {
                _logger.LogInformation("正在启用远程桌面...");
                if (_remoteDesktopService.EnableRemoteDesktop())
                {
                    _logger.LogInformation("远程桌面已成功启用，端口: {Port}", _remoteDesktopService.GetRdpPort());
                }
                else
                {
                    _logger.LogWarning("启用远程桌面失败，请检查是否以管理员权限运行");
                }
            }
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "启用远程桌面时发生异常");
        }
    }

    private async Task ReportFullInfoAsync()
    {
        try
        {
            var deviceInfo = _deviceInfoService.GetDeviceInfo();
            _cachedUuid = deviceInfo.Uuid;
            
            _logger.LogInformation("收集到设备信息:");
            _logger.LogInformation("  UUID: {Uuid}", deviceInfo.Uuid);
            _logger.LogInformation("  主机名: {Hostname}", deviceInfo.Hostname);
            _logger.LogInformation("  IP地址: {IpAddress}", deviceInfo.IpAddress);
            _logger.LogInformation("  MAC地址: {MacAddress}", deviceInfo.MacAddress);
            _logger.LogInformation("  操作系统: {OsName}", deviceInfo.OsName);
            _logger.LogInformation("  CPU: {CpuName}", deviceInfo.CpuName);
            _logger.LogInformation("  内存: {Memory} MB", deviceInfo.TotalMemoryMB);
            
            await _reportService.ReportDeviceInfoAsync(deviceInfo);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "上报完整信息失败");
        }
    }

    private async Task UploadScreenshotAsync()
    {
        try
        {
            var screenshot = _screenCaptureService.CaptureScreen(
                _config.ScreenCaptureQuality, 
                _config.ScreenCaptureMaxWidth);
            
            if (screenshot.Length > 0)
            {
                _logger.LogDebug("截图大小: {Size} KB", screenshot.Length / 1024);
                await _reportService.UploadScreenshotAsync(_cachedUuid!, screenshot);
            }
        }
        catch (Exception ex)
        {
            _logger.LogWarning(ex, "屏幕截图上传失败");
        }
    }
}