using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;

namespace SHH.CameraSdk;

/// <summary>
/// 视频源实时状态监控 API 控制器
/// 核心功能：提供相机设备遥测数据查询、单设备详情查询、系统日志查询
/// </summary>
[ApiController]
[Route("api/monitor")] // [建议] 显式指定路由为小写，确保与前端 ${API}/monitor/... 匹配
public class MonitorController : ControllerBase
{
    #region --- 依赖注入 (Dependency Injection) ---

    private readonly CameraManager _cameraManager;
    private readonly IStorageService _storage; // [新增] 存储服务引用

    /// <summary>
    /// 构造函数：注入 CameraManager 和 IStorageService
    /// </summary>
    public MonitorController(CameraManager cameraManager, IStorageService storage)
    {
        _cameraManager = cameraManager;
        _storage = storage;
    }

    #endregion

    #region --- API 接口定义 (API Endpoints) ---

    /// <summary>
    /// 获取全量相机实时遥测数据快照
    /// 适用场景：监控大屏首页数据看板
    /// </summary>
    [HttpGet("dashboard")]
    public IActionResult GetDashboard()
    {
        var telemetrySnapshot = _cameraManager.GetTelemetrySnapshot();
        return Ok(telemetrySnapshot);
    }

    /// <summary>
    /// 获取指定相机的详细运行指标
    /// </summary>
    [HttpGet("{id}")]
    public IActionResult GetDeviceDetail(long id)
    {
        var device = _cameraManager.GetDevice(id);
        if (device == null) return NotFound($"设备 ID: {id} 不存在");

        return Ok(new
        {
            device.Id,
            device.Status,
            device.IsOnline,
            device.RealFps,
            device.TotalFrames,
            device.Config.Name,
            device.Config.IpAddress
        });
    }

    /// <summary>
    /// 获取指定相机的实时截图
    /// </summary>
    [HttpGet("snapshot/{id}")]
    public async Task<IActionResult> GetSnapshot(long id)
    {
        // 假设您有 SnapshotCoordinator 单例，此处保留原逻辑
        var imageBytes = await SnapshotCoordinator.Instance.RequestSnapshotAsync(id, 2000);

        if (imageBytes == null)
        {
            return StatusCode(StatusCodes.Status504GatewayTimeout, "截图请求超时或设备未响应");
        }

        return File(imageBytes, "image/jpeg");
    }

    /// <summary>
    /// 获取指定相机的深度诊断信息（包含持久化的审计日志）
    /// </summary>
    [HttpGet("diagnose/{id}")]
    public async Task<IActionResult> GetDeviceDiagnostic(long id)
    {
        var device = _cameraManager.GetDevice(id);
        if (device == null) return NotFound("设备不存在");

        // [修正] 改为从 StorageService 读取文件日志
        // 这样即使重启程序，历史日志也能查到
        var logs = await _storage.GetDeviceLogsAsync((int)id, 50);

        return Ok(new
        {
            // 基础信息
            Id = device.Id,
            Status = device.Status.ToString(),
            RealFps = device.RealFps,
            TotalFrames = device.TotalFrames,

            // 实时状态
            BasicInfo = device.Config,
            RealTimeStats = new
            {
                device.RealFps,
                device.TotalFrames,
                device.IsPhysicalOnline,
                device.Width,
                device.Height
            },

            // [关键] 持久化日志
            AuditLogs = logs
        });
    }

    #endregion

    /// <summary>
    /// 获取系统操作日志（读取最新的 50 条）
    /// </summary>
    [HttpGet("system-logs")]
    public async Task<IActionResult> GetSystemLogs()
    {
        // [修正] 彻底废弃手动读文件，改用 Service
        // Service 内部会自动处理锁、路径 (App_Data/Process_X/system.log) 和异常
        var logs = await _storage.GetSystemLogsAsync(50);

        return Ok(logs);
    }
}