import { DecodedVerifiableCredentialDto } from '../../shared/dto/decodedVerifiableCredential.dto.js';
import {
  CredentialValidationResult,
  CredentialValidator,
} from './credentialValidator.interface.js';
import { CredentialValidationTypes } from '../presentation/verifiablePresentationValidationReport.js';

export class ExpirationValidator implements CredentialValidator {
  private result: CredentialValidationResult;

  constructor() {
    this.result = {
      valid: true,
    };
  }

  validate(
    credential: DecodedVerifiableCredentialDto,
  ): Promise<CredentialValidationResult> {
    const currentDate = new Date();

    if (credential.exp) {
      this.checkExpirationDate(
        new Date((credential.exp as number) * 1000),
        currentDate,
        credential.vc.id,
      );
    }

    if (credential.vc?.validUntil) {
      this.checkExpirationDate(
        new Date(credential.vc.validUntil),
        currentDate,
        credential.vc.id,
      );
    }
    if (credential.vc?.expirationDate) {
      this.checkExpirationDate(
        new Date(credential.vc.expirationDate),
        currentDate,
        credential.vc.id,
      );
    }

    return Promise.resolve(this.result);
  }

  private checkExpirationDate(
    expirationDate: Date,
    currentDate: Date,
    credentialId: string,
  ) {
    if (expirationDate <= currentDate) {
      this.result = {
        valid: false,
        message: `${credentialId} is expired`,
      };
    }
  }

  public getValidationType(): CredentialValidationTypes {
    return CredentialValidationTypes.Expiration;
  }
}