using AmtScanner.Api.Models;
using AmtScanner.Api.Services;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.SignalR;
using System.Collections.Concurrent;

namespace AmtScanner.Api.Controllers;

[ApiController]
[Route("api/[controller]")]
public class ScanController : ControllerBase
{
    private readonly IAmtScannerService _scannerService;
    private readonly IHubContext<ScanProgressHub> _hubContext;
    private readonly ILogger<ScanController> _logger;
    
    // 存储扫描进度状态
    private static readonly ConcurrentDictionary<string, ScanStatusInfo> _scanStatuses = new();
    
    public ScanController(
        IAmtScannerService scannerService,
        IHubContext<ScanProgressHub> hubContext,
        ILogger<ScanController> logger)
    {
        _scannerService = scannerService;
        _hubContext = hubContext;
        _logger = logger;
    }
    
    [HttpPost("start")]
    public async Task<ActionResult<ApiResponse<ScanStartResponse>>> StartScan([FromBody] ScanRequest request)
    {
        var taskId = Guid.NewGuid().ToString();
        
        _logger.LogInformation("Starting scan task: {TaskId}", taskId);
        
        // 初始化扫描状态
        _scanStatuses[taskId] = new ScanStatusInfo
        {
            TaskId = taskId,
            Status = "running",
            ScannedCount = 0,
            TotalCount = 0,
            FoundDevices = 0
        };
        
        // 创建进度回调 - 直接使用 Action 而不是 Progress<T>
        Action<ScanProgress> progressCallback = p =>
        {
            // 更新状态存储
            if (_scanStatuses.TryGetValue(taskId, out var status))
            {
                status.ScannedCount = p.ScannedCount;
                status.TotalCount = p.TotalCount;
                status.FoundDevices = p.FoundDevices;
                status.CurrentIp = p.CurrentIp;
                
                _logger.LogInformation("Progress update: scanned={Scanned}, total={Total}, found={Found}, ip={Ip}", 
                    p.ScannedCount, p.TotalCount, p.FoundDevices, p.CurrentIp);
            }
            
            // 异步发送 SignalR 通知（不等待）
            _ = _hubContext.Clients.All.SendAsync("ReceiveScanProgress", p);
        };
        
        // Start scan in background
        _ = Task.Run(async () =>
        {
            try
            {
                var foundDevicesList = await _scannerService.ScanNetworkAsync(
                    taskId,
                    request.NetworkSegment,
                    request.SubnetMask,
                    progressCallback
                );
                
                // 更新状态为完成，并确保 foundDevices 是正确的
                if (_scanStatuses.TryGetValue(taskId, out var status))
                {
                    status.Status = "completed";
                    status.FoundDevices = foundDevicesList.Count;
                    _logger.LogInformation("Scan task {TaskId} completed with {Count} devices found", taskId, foundDevicesList.Count);
                }
                
                // Send completion notification
                await _hubContext.Clients.All.SendAsync("ScanCompleted", new { taskId });
            }
            catch (Exception ex)
            {
                // 更新状态为错误
                if (_scanStatuses.TryGetValue(taskId, out var status))
                {
                    status.Status = "error";
                    status.Error = ex.Message;
                }
                
                _logger.LogError(ex, "Error in scan task {TaskId}", taskId);
                await _hubContext.Clients.All.SendAsync("ScanError", new { taskId, error = ex.Message });
            }
        });
        
        return Ok(ApiResponse<ScanStartResponse>.Success(new ScanStartResponse { TaskId = taskId }, "扫描任务已启动"));
    }
    
    [HttpGet("status/{taskId}")]
    public ActionResult<ApiResponse<ScanStatusInfo>> GetScanStatus(string taskId)
    {
        if (_scanStatuses.TryGetValue(taskId, out var status))
        {
            _logger.LogDebug("GetScanStatus: taskId={TaskId}, status={Status}, scanned={Scanned}, total={Total}, found={Found}", 
                taskId, status.Status, status.ScannedCount, status.TotalCount, status.FoundDevices);
            return Ok(ApiResponse<ScanStatusInfo>.Success(status));
        }
        
        return Ok(ApiResponse<ScanStatusInfo>.Fail(404, "扫描任务不存在"));
    }
    
    [HttpPost("cancel/{taskId}")]
    public ActionResult<ApiResponse<object>> CancelScan(string taskId)
    {
        _scannerService.CancelScan(taskId);
        
        // 更新状态为已取消
        if (_scanStatuses.TryGetValue(taskId, out var status))
        {
            status.Status = "cancelled";
        }
        
        return Ok(ApiResponse<object>.Success(null, "扫描任务已取消"));
    }
}

public class ScanStartResponse
{
    public string TaskId { get; set; } = string.Empty;
}

public class ScanStatusInfo
{
    public string TaskId { get; set; } = string.Empty;
    public string Status { get; set; } = "idle"; // idle, running, completed, cancelled, error
    public int ScannedCount { get; set; }
    public int TotalCount { get; set; }
    public int FoundDevices { get; set; }
    public string? CurrentIp { get; set; }
    public string? Error { get; set; }
}

public class ScanRequest
{
    public string NetworkSegment { get; set; } = string.Empty;
    public string SubnetMask { get; set; } = string.Empty;
}