mws.backend.dotnet/application/Permissions/Commands/UpdateRole.cs

using AutoMapper;
using MediatR;
using mws.backend.dotnet.application.Audit;
using mws.backend.dotnet.application.Common;

namespace mws.backend.dotnet.application.Permissions;

public record UpdateRoleCommand(Guid Id, SaveRoleRequest Request) : IRequest<RoleDto>, IAuditableRequest
{
    public string Action => "Role.Update";
    public string EntityType => "Role";
    public Guid? EntityId => Id;
    public string? EntityName => Request.Name;
}

public class UpdateRoleHandler(IUnitOfWork uow, IMapper mapper) : IRequestHandler<UpdateRoleCommand, RoleDto>
{
    public async Task<RoleDto> Handle(UpdateRoleCommand command, CancellationToken ct)
    {
        var role = await uow.Roles.GetByIdWithPermissionsAsync(command.Id, ct)
            ?? throw new NotFoundException("Role not found");

        var name = command.Request.Name.Trim();
        if (string.IsNullOrWhiteSpace(name))
        {
            throw new BadRequestException("Role name is required");
        }

        if (await uow.Roles.ExistsByNameAsync(name, command.Id, ct))
        {
            throw new BadRequestException("Role name already exists");
        }

        role.Name = name;
        role.UpdatedAt = DateTime.UtcNow;

        uow.Roles.RemovePermissions(role.Permissions.ToList());
        role.Permissions = RolePermissionBuilder.Build(command.Request.Permissions);
        foreach (var p in role.Permissions)
        {
            p.RoleId = role.Id;
        }

        await uow.SaveChangesAsync(ct);
        return mapper.Map<RoleDto>(role);
    }
}