mws.backend.dotnet/mws.application/Roles/Commands/CreateRole.cs

using AutoMapper;
using MediatR;
using Mws.Application.Common;
using Mws.Domain.Roles;

namespace Mws.Application.Roles;

public record CreateRoleCommand(SaveRoleRequest Request) : IRequest<RoleDto>;

public class CreateRoleHandler(IUnitOfWork uow, IMapper mapper) : IRequestHandler<CreateRoleCommand, RoleDto>
{
    public async Task<RoleDto> Handle(CreateRoleCommand command, CancellationToken ct)
    {
        var name = command.Request.Name.Trim();
        if (string.IsNullOrWhiteSpace(name))
        {
            throw new BadRequestException("Role name is required");
        }

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

        var now = DateTime.UtcNow;
        var role = new Role
        {
            Id = Guid.NewGuid(),
            Name = name,
            IsSystem = false,
            CreatedAt = now,
            UpdatedAt = now,
            Permissions = RolePermissionBuilder.Build(command.Request.Permissions),
        };

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