using Microsoft.AspNetCore.Mvc;

namespace SHH.CameraSdk;

[ApiController]
[Route("api/[controller]")]
public class CamerasController : ControllerBase
{
    private readonly CameraManager _manager;

    // 构造函数注入管理器
    public CamerasController(CameraManager manager, DisplayWindowManager displayManager)
    {
        _manager = manager;
        _displayManager = displayManager;
    }

    // ==========================================================================
    // 区域 A: 设备全生命周期管理 (CRUD)
    // ==========================================================================

    /// <summary>
    /// 1. 获取所有设备清单
    /// </summary>
    [HttpGet]
    public IActionResult GetAll()
    {
        var devices = _manager.GetAllDevices().Select(d => new
        {
            d.Id,
            d.Config.IpAddress,
            d.Config.Name,
            Status = d.Status.ToString(),
            d.RealFps,
            d.TotalFrames
        });
        return Ok(devices);
    }

    /// <summary>
    /// 2. 新增设备 (写入配置并初始化)
    /// </summary>
    [HttpPost]
    public IActionResult Add([FromBody] CameraConfigDto dto)
    {
        if (_manager.GetDevice(dto.Id) != null)
            return Conflict($"设备ID {dto.Id} 已存在");

        // DTO 转 Config (实际项目中建议用 AutoMapper)
        var config = MapToConfig(dto);

        _manager.AddDevice(config); // 添加到内存池
                                    // 注意：此时 IsRunning 默认为 false，等待手动 Start 或 API 控制

        return CreatedAtAction(nameof(GetAll), new { id = dto.Id }, dto);
    }

    /// <summary>
    /// 3. 编辑设备 (自动识别冷热更新)
    /// </summary>
    [HttpPut("{id}")]
    public async Task<IActionResult> Update(long id, [FromBody] CameraConfigDto dto)
    {
        try
        {
            if (id != dto.Id) return BadRequest("ID 不匹配");

            // 调用 Manager 的智能更新逻辑 (之前实现的 UpdateDeviceConfigAsync)
            await _manager.UpdateDeviceConfigAsync(id, MapToUpdateDto(dto));

            return Ok(new { Success = true, Message = "配置已更新" });
        }
        catch (KeyNotFoundException) { return NotFound(); }
        catch (System.Exception ex) { return StatusCode(500, ex.Message); }
    }

    /// <summary>
    /// 4. 删除设备 (销毁连接)
    /// </summary>
    [HttpDelete("{id}")]
    public async Task<IActionResult> Remove(long id)
    {
        var device = _manager.GetDevice(id);
        if (device == null) return NotFound();

        await device.StopAsync(); // 停流
        _manager.RemoveDevice(id); // 从池中移除

        return Ok($"设备 {id} 已移除");
    }

    // ==========================================================================
    // 区域 B: 多进程流控订阅 (Subscription Strategy)
    // ==========================================================================


    // ==========================================================================
    // 区域 C: 句柄动态绑定 (Handle Binding)
    // ==========================================================================

    /// <summary>
    /// 6. 绑定显示窗口 (对应 A进程-句柄场景)
    /// </summary>
    [HttpPost("{id}/bind-handle")]
    public IActionResult BindHandle(long id, [FromBody] BindHandleDto dto)
    {
        var device = _manager.GetDevice(id);
        if (device == null) return NotFound();

        // 构造动态选项，应用句柄
        var options = new DynamicStreamOptions
        {
            RenderHandle = (System.IntPtr)dto.Handle
        };

        device.ApplyOptions(options); // 触发驱动层的 OnApplyOptions

        device.AddAuditLog($"绑定新句柄: {dto.Handle} ({dto.Purpose})");

        return Ok(new { Success = true });
    }

    // ==========================================================================
    // 区域 D: 设备运行控制
    // ==========================================================================

    /// <summary>
    /// 手动控制设备运行状态 (开关机)
    /// </summary>
    [HttpPost("{id}/power")]
    public async Task<IActionResult> TogglePower(long id, [FromQuery] bool enabled)
    {
        var device = _manager.GetDevice(id);
        if (device == null) return NotFound();

        // 1. 更新运行意图
        device.IsRunning = enabled;

        // 2. 审计与执行
        if (enabled)
        {
            device.AddAuditLog("用户指令：手动开启设备");
            // 异步启动，Coordinator 也会在下个周期辅助检查
            _ = device.StartAsync();
        }
        else
        {
            device.AddAuditLog("用户指令：手动关闭设备");
            await device.StopAsync();
        }

        return Ok(new { DeviceId = id, IsRunning = enabled });
    }

    /// <summary>
    /// 热应用动态参数 (如切换码流)
    /// </summary>
    [HttpPost("{id}/options")]
    public IActionResult ApplyOptions(long id, [FromBody] DynamicStreamOptions options)
    {
        var device = _manager.GetDevice(id);
        if (device == null) return NotFound();

        // 1. 如果涉及码流切换，先同步更新配置对象
        if (options.StreamType.HasValue)
        {
            var newConfig = device.Config.DeepCopy();
            newConfig.StreamType = options.StreamType.Value;
            device.UpdateConfig(newConfig);
        }

        // 2. 应用到驱动层（触发热切换逻辑）
        device.ApplyOptions(options);

        return Ok(new { Message = "动态参数已发送", DeviceId = id });
    }

    // ==========================================================================
    // 辅助方法 (Mapping)
    // ==========================================================================
    private VideoSourceConfig MapToConfig(CameraConfigDto dto)
    {
        return new VideoSourceConfig
        {
            Id = dto.Id,
            Name = dto.Name,
            Brand = (DeviceBrand)dto.Brand,
            IpAddress = dto.IpAddress,
            Port = dto.Port,
            Username = dto.Username,
            Password = dto.Password,
            ChannelIndex = dto.ChannelIndex,
            StreamType = dto.StreamType,
            RtspPath = dto.RtspPath
        };
    }

    /// <summary>
    /// [辅助方法] 将全量配置 DTO 转换为更新 DTO
    /// </summary>
    private DeviceUpdateDto MapToUpdateDto(CameraConfigDto dto)
    {
        return new DeviceUpdateDto
        {
            // ==========================================
            // 1. 冷更新参数 (基础连接信息)
            // ==========================================
            IpAddress = dto.IpAddress,
            Port = dto.Port,
            Username = dto.Username,
            Password = dto.Password,
            ChannelIndex = dto.ChannelIndex,
            Brand = dto.Brand,
            RtspPath = dto.RtspPath,
            MainboardIp = dto.MainboardIp,
            MainboardPort = dto.MainboardPort,

            // ==========================================
            // 2. 热更新参数 (运行时属性)
            // ==========================================
            Name = dto.Name,
            Location = dto.Location,
            StreamType = dto.StreamType,

            // 注意：通常句柄是通过 bind-handle 接口单独绑定的，
            // 但如果 ConfigDto 里包含了上次保存的句柄，也可以映射
            // RenderHandle = dto.RenderHandle, 

            // ==========================================
            // 3. 图像处理参数
            // ==========================================
            AllowCompress = dto.AllowCompress,
            AllowExpand = dto.AllowExpand,
            TargetResolution = dto.TargetResolution,
            EnhanceImage = dto.EnhanceImage,
            UseGrayscale = dto.UseGrayscale
        };
    }

    /// <summary>
    /// [新增] 查询某台设备的当前流控策略
    /// </summary>
    [HttpGet("{id}/subscriptions")]
    public IActionResult GetSubscriptions(long id)
    {
        var device = _manager.GetDevice(id);
        if (device == null) return NotFound();

        // 调用刚才在 FrameController 写的方法
        var subs = device.Controller.GetCurrentRequirements();

        return Ok(subs);
    }

    private readonly DisplayWindowManager _displayManager; // [新增]

    [HttpPost("{id}/subscriptions")]
    public IActionResult UpdateSubscription(int id, [FromBody] SubscriptionDto dto)
    {
        var device = _manager.GetDevice(id);
        if (device == null) return NotFound("设备不存在");

        if (device is HikVideoSource hikCam)
        {
            // 1. 更新流控策略 (FrameController)
            // 告诉底层：这个 AppId 需要多少帧
            int totalFps = dto.DisplayFps + dto.AnalysisFps;

            if (totalFps > 0)
            {
                // 情况 A: 这是一个新增或更新订阅
                hikCam.Controller.Register(dto.AppId, totalFps);

                // 如果是预览模式，启动窗口
                if (dto.DisplayFps > 0)
                {
                    _displayManager.StartDisplay(dto.AppId, id);
                }
            }
            else
            {
                // 情况 B: 这是一个停止订阅请求 (FPS 为 0)
                // 1. 【核心修复】从调度中心物理删除，不再出现在列表中
                hikCam.Controller.Unregister(dto.AppId);

                // 2. 关闭可能存在的本地窗口
                _displayManager.StopDisplay(dto.AppId);
            }

            return Ok(new { message = "Policy updated", currentConfig = hikCam.Controller.GetCurrentRequirements() });
        }

        return BadRequest("Device implies no controller");
    }

    // 1. 获取单个设备详情（用于编辑回填）
    [HttpGet("{id}")]
    public IActionResult GetDevice(int id)
    {
        var cam = _manager.GetDevice(id);
        if (cam == null) return NotFound();
        return Ok(cam.Config); // 返回原始配置对象
    }

    // 2. 更新设备（保存功能）
    [HttpPut("{id}")]
    public async Task<IActionResult> UpdateDevice(int id, [FromBody] VideoSourceConfig config)
    {
        // 核心逻辑：先停止旧设备 -> 更新配置 -> 重新添加到容器 -> 如果之前在运行则重新启动
        await _manager.UpdateDeviceAsync(id, config);
        return Ok();
    }

    // 3. 清除特定设备的日志
    [HttpDelete("{id}/logs")]
    public IActionResult ClearLogs(int id)
    {
        var cam = _manager.GetDevice(id);
        cam?.ClearAuditLogs();
        return Ok();
    }

    //// 4. 抓图诊断
    //[HttpGet("{id}/capture")]
    //public async Task<IActionResult> Capture(int id)
    //{
    //    var cam = _manager.GetDevice(id);
    //    if (cam == null) return NotFound();
    //    var bytes = await cam.CaptureCurrentFrameAsync();
    //    return File(bytes, "image/jpeg");
    //}
}