CellularManagement/src/X1.Application/Features/Permissions/Queries/GetAllPermissionsQueryHandler.cs

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

namespace X1.Application.Features.Permissions.Queries;

/// <summary>
/// 获取所有权限查询处理器
/// </summary>
public sealed class GetAllPermissionsQueryHandler : IRequestHandler<GetAllPermissionsQuery, OperationResult<GetAllPermissionsResponse>>
{
    private readonly IPermissionRepository _permissionRepository;
    private readonly ILogger<GetAllPermissionsQueryHandler> _logger;

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

    /// <summary>
    /// 处理获取所有权限请求（分页+筛选）
    /// </summary>
    public async Task<OperationResult<GetAllPermissionsResponse>> Handle(
        GetAllPermissionsQuery request,
        CancellationToken cancellationToken)
    {
        try
        {
            var result = await _permissionRepository.GetPagedAsync(
                pageNumber: request.PageNumber,
                pageSize: request.PageSize,
                searchTerm: request.Keyword,
                isEnabled: request.IsEnabled,
                isSystem: request.IsSystem,
                cancellationToken: cancellationToken);

            var permissionDtos = result.Items.Select(permission => new PermissionDto(
                permission.Id,
                permission.Name,
                permission.Code,
                permission.Description,
                PermissionType.Resource, // 默认类型
                PermissionLevel.View, // 默认级别
                null, // ResourceType - 从 Code 解析
                null, // ActionType - 从 Code 解析
                permission.IsEnabled,
                permission.IsSystem,
                0, // SortOrder - 不需要
                DateTime.UtcNow, // CreatedAt - 不需要
                DateTime.UtcNow  // UpdatedAt - 不需要
            )).ToList();

            var response = new GetAllPermissionsResponse(
                permissionDtos,
                result.TotalCount,
                request.PageNumber,
                request.PageSize
            );

            _logger.LogInformation("成功获取权限列表，共 {Count} 个", result.TotalCount);

            return OperationResult<GetAllPermissionsResponse>.CreateSuccess(response);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "获取权限列表失败");
            return OperationResult<GetAllPermissionsResponse>.CreateFailure("获取权限列表失败，请稍后重试");
        }
    }
}