using MediatR;
using Microsoft.Extensions.Logging;
using CellularManagement.Domain.Common;
using CellularManagement.Domain.Repositories.Device;
using CellularManagement.Domain.Repositories.Terminal;

namespace CellularManagement.Application.Features.TerminalDevices.Queries.GetTerminalDeviceById;

/// <summary>
/// 根据ID获取终端设备查询处理器
/// </summary>
public class GetTerminalDeviceByIdQueryHandler : IRequestHandler<GetTerminalDeviceByIdQuery, OperationResult<GetTerminalDeviceByIdResponse>>
{
    private readonly ITerminalDeviceRepository _deviceRepository;
    private readonly ILogger<GetTerminalDeviceByIdQueryHandler> _logger;

    /// <summary>
    /// 初始化查询处理器
    /// </summary>
    public GetTerminalDeviceByIdQueryHandler(
        ITerminalDeviceRepository deviceRepository,
        ILogger<GetTerminalDeviceByIdQueryHandler> logger)
    {
        _deviceRepository = deviceRepository;
        _logger = logger;
    }

    /// <summary>
    /// 处理根据ID获取终端设备查询
    /// </summary>
    public async Task<OperationResult<GetTerminalDeviceByIdResponse>> Handle(GetTerminalDeviceByIdQuery request, CancellationToken cancellationToken)
    {
        try
        {
            _logger.LogInformation("开始获取终端设备详情，设备ID: {DeviceId}", request.DeviceId);

            // 获取设备
            var device = await _deviceRepository.GetDeviceByIdAsync(request.DeviceId, cancellationToken);
            if (device == null)
            {
                _logger.LogWarning("终端设备不存在，设备ID: {DeviceId}", request.DeviceId);
                return OperationResult<GetTerminalDeviceByIdResponse>.CreateFailure("终端设备不存在");
            }

            // 构建响应
            var response = new GetTerminalDeviceByIdResponse
            {
                Id = device.Id,
                Name = device.Name,
                DeviceCode = device.DeviceCode,
                Description = device.Description,
                AgentPort = device.AgentPort,
                IpAddress = device.IpAddress,
                IsEnabled = device.IsEnabled,
                DeviceType = device.DeviceType.ToString(),
                CreatedAt = device.CreatedAt,
                UpdatedAt = device.UpdatedAt,
                CreatedBy = device.CreatedBy,
                UpdatedBy = device.UpdatedBy
            };

            _logger.LogInformation("获取终端设备详情成功，设备ID: {DeviceId}, 设备名称: {DeviceName}", 
                device.Id, device.Name);

            return OperationResult<GetTerminalDeviceByIdResponse>.CreateSuccess(response);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "获取终端设备详情时发生错误，设备ID: {DeviceId}", request.DeviceId);
            return OperationResult<GetTerminalDeviceByIdResponse>.CreateFailure("获取终端设备详情时发生错误");
        }
    }
}