import {
    AuthenticationConfig,
    AuthenticationUrlConfig,
    PresentationDuringIssuanceConfig,
} from './authentication-config.dto';

/**
 * Utility functions for working with OpenID4VC authentication configurations
 */
export class AuthenticationConfigHelper {
    /**
     * Type guard to check if the config uses pre-authorized code flow
     */
    static isNoneAuth(
        config: AuthenticationConfig,
    ): config is { method: 'none' } {
        return config.method === 'none';
    }

    /**
     * Type guard to check if the config uses OID4VCI authorized code flow
     */
    static isAuthUrlAuth(
        config: AuthenticationConfig,
    ): config is { method: 'auth'; config: AuthenticationUrlConfig } {
        return config.method === 'auth';
    }

    /**
     * Type guard to check if the config uses OID4VP flow
     */
    static isPresentationDuringIssuanceAuth(
        config: AuthenticationConfig,
    ): config is {
        method: 'presentationDuringIssuance';
        config: PresentationDuringIssuanceConfig;
    } {
        return config.method === 'presentationDuringIssuance';
    }

    /**
     * Get the presentation configuration if the method is 'presentationDuringIssuance'
     */
    static getPresentationConfig(
        config: AuthenticationConfig,
    ): PresentationDuringIssuanceConfig | null {
        if (this.isPresentationDuringIssuanceAuth(config)) {
            return config.config;
        }
        return null;
    }
}