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

namespace Mws.Application.Roles;

public record UpdateRoleCommand(Guid Id, SaveRoleRequest Request) : IRequest<RoleDto>;

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);
    }
}