using System;
using System.Threading;
using System.Threading.Tasks;
using MediatR;
using Microsoft.Extensions.Logging;
using X1.Domain.Entities;
using X1.Domain.Repositories.Identity;
using X1.Domain.Common;

namespace X1.Application.Features.Permissions.Commands.UpdatePermission;

/// <summary>
/// 更新权限命令处理器
/// </summary>
public sealed class UpdatePermissionCommandHandler : IRequestHandler<UpdatePermissionCommand, OperationResult<UpdatePermissionResponse>>
{
    private readonly IPermissionRepository _permissionRepository;
    private readonly ILogger<UpdatePermissionCommandHandler> _logger;

    /// <summary>
    /// 初始化处理器
    /// </summary>
    public UpdatePermissionCommandHandler(
        IPermissionRepository permissionRepository,
        ILogger<UpdatePermissionCommandHandler> logger)
    {
        _permissionRepository = permissionRepository;
        _logger = logger;
    }

    /// <summary>
    /// 处理更新权限请求
    /// </summary>
    public async Task<OperationResult<UpdatePermissionResponse>> Handle(
        UpdatePermissionCommand request,
        CancellationToken cancellationToken)
    {
        try
        {
            // 查找权限
            var permission = await _permissionRepository.GetByIdAsync(request.Id, cancellationToken: cancellationToken);
            if (permission == null)
            {
                _logger.LogWarning("权限 {PermissionId} 不存在", request.Id);
                return OperationResult<UpdatePermissionResponse>.CreateFailure("权限不存在");
            }

            // 更新权限信息
            permission.Name = request.Name;
            permission.Description = request.Description;
            permission.IsEnabled = request.IsEnabled ?? permission.IsEnabled;

            _permissionRepository.Update(permission);

            _logger.LogInformation("权限 {PermissionId} 更新成功", request.Id);

            return OperationResult<UpdatePermissionResponse>.CreateSuccess(
                new UpdatePermissionResponse(request.Id, true));
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "更新权限 {PermissionId} 失败", request.Id);
            return OperationResult<UpdatePermissionResponse>.CreateFailure("更新权限失败，请稍后重试");
        }
    }
}