using MediatR;
using Microsoft.Extensions.Logging;
using CellularManagement.Domain.Common;
using CellularManagement.Domain.Repositories.NetworkProfile;
using CellularManagement.Domain.Repositories.Base;
using CellularManagement.Domain.Services;
using CellularManagement.Domain.Entities.NetworkProfile;

namespace CellularManagement.Application.Features.IMSConfiguration.Commands.CreateIMS_Configuration;

/// <summary>
/// 创建IMS配置命令处理器
/// </summary>
public class CreateIMS_ConfigurationCommandHandler : IRequestHandler<CreateIMS_ConfigurationCommand, OperationResult<CreateIMS_ConfigurationResponse>>
{
    private readonly IIMS_ConfigurationRepository _imsConfigurationRepository;
    private readonly ILogger<CreateIMS_ConfigurationCommandHandler> _logger;
    private readonly IUnitOfWork _unitOfWork;
    private readonly ICurrentUserService _currentUserService;

    /// <summary>
    /// 初始化命令处理器
    /// </summary>
    public CreateIMS_ConfigurationCommandHandler(
        IIMS_ConfigurationRepository imsConfigurationRepository,
        ILogger<CreateIMS_ConfigurationCommandHandler> logger,
        IUnitOfWork unitOfWork,
        ICurrentUserService currentUserService)
    {
        _imsConfigurationRepository = imsConfigurationRepository;
        _logger = logger;
        _unitOfWork = unitOfWork;
        _currentUserService = currentUserService;
    }

    /// <summary>
    /// 处理创建IMS配置命令
    /// </summary>
    public async Task<OperationResult<CreateIMS_ConfigurationResponse>> Handle(CreateIMS_ConfigurationCommand request, CancellationToken cancellationToken)
    {
        try
        {
            _logger.LogInformation("开始创建IMS配置，配置名称: {Name}", request.Name);

            // 检查配置名称是否已存在
            if (await _imsConfigurationRepository.NameExistsAsync(request.Name, cancellationToken))
            {
                _logger.LogWarning("IMS配置名称已存在: {Name}", request.Name);
                return OperationResult<CreateIMS_ConfigurationResponse>.CreateFailure($"IMS配置名称 {request.Name} 已存在");
            }

            // 获取当前用户ID
            var currentUserId = _currentUserService.GetCurrentUserId();
            if (string.IsNullOrEmpty(currentUserId))
            {
                _logger.LogError("无法获取当前用户ID，用户可能未认证");
                return OperationResult<CreateIMS_ConfigurationResponse>.CreateFailure("用户未认证，无法创建IMS配置");
            }

            // 创建IMS配置实体
            var imsConfiguration = IMS_Configuration.Create(
                name: request.Name,
                configContent: request.ConfigContent,
                createdBy: currentUserId,
                description: request.Description,
                isDisabled: request.IsDisabled);

            // 保存IMS配置
            await _imsConfigurationRepository.AddIMS_ConfigurationAsync(imsConfiguration, cancellationToken);

            // 保存更改到数据库
            await _unitOfWork.SaveChangesAsync(cancellationToken);

            // 构建响应
            var response = new CreateIMS_ConfigurationResponse
            {
                IMS_ConfigurationId = imsConfiguration.Id,
                Name = imsConfiguration.Name,
                ConfigContent = imsConfiguration.ConfigContent,
                Description = imsConfiguration.Description,
                IsDisabled = imsConfiguration.IsDisabled,
                CreatedAt = imsConfiguration.CreatedAt
            };

            _logger.LogInformation("IMS配置创建成功，配置ID: {IMS_ConfigurationId}, 配置名称: {Name}", 
                imsConfiguration.Id, imsConfiguration.Name);
            return OperationResult<CreateIMS_ConfigurationResponse>.CreateSuccess(response);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "创建IMS配置时发生错误，配置名称: {Name}", request.Name);
            return OperationResult<CreateIMS_ConfigurationResponse>.CreateFailure($"创建IMS配置时发生错误: {ex.Message}");
        }
    }
}