import { AbilitySchema } from '../AbilitySchema';
import { RoleTransformer } from './RoleTransformer';
import { Role } from '../models/Role.model';
import { TransformerInjectable } from '../../Transformer/TransformerInjectable.service';
import { ServiceError } from '../../Items/ServiceError';
import { Inject, Injectable } from '@nestjs/common';
import { CommandRolePermissionDto } from '../dtos/Role.dto';
import { ERRORS } from '../constants';
import { getInvalidPermissions } from '../utils';
import { TenantModelProxy } from '@/modules/System/models/TenantBaseModel';

@Injectable()
export class GetRoleService {
  constructor(
    private readonly transformer: TransformerInjectable,

    @Inject(Role.name)
    private readonly roleModel: TenantModelProxy<typeof Role>,
  ) {}

  /**
   * Retrieve the given role metadata.
   * @param {number} roleId - Role id.
   * @returns {Promise<IRole>}
   */
  public async getRole(roleId: number): Promise<Role> {
    const role = await this.roleModel()
      .query()
      .findById(roleId)
      .withGraphFetched('permissions')
      .throwIfNotFound();

    return this.transformer.transform(role, new RoleTransformer());
  }

  /**
   * Validates the invalid given permissions.
   * @param {ICreateRolePermissionDTO[]} permissions -
   */
  public validateInvalidPermissions = (
    permissions: CommandRolePermissionDto[],
  ) => {
    const invalidPerms = getInvalidPermissions(AbilitySchema, permissions);

    if (invalidPerms.length > 0) {
      throw new ServiceError(ERRORS.INVALIDATE_PERMISSIONS, null, {
        invalidPermissions: invalidPerms,
      });
    }
  };
}