import { Ajv, type ErrorObject } from 'ajv';
import type { ILogObj } from 'tslog';
import { Logger } from 'tslog';
import type { OcppRequest, OcppResponse } from '../../ocpp/internal-types.js';
import { type CallAction, OcppError, OCPPVersion } from '../../ocpp/rpc/message.js';
export declare class OCPPValidator {
    protected _ajv: Ajv;
    protected readonly _logger: Logger<ILogObj>;
    constructor(logger?: Logger<ILogObj>, ajv?: Ajv);
    /**
     * Creates an Ajv instance configured for Fastify HTTP schema compilation.
     * Enables type coercion since HTTP query/path params arrive as strings,
     * and does not include OCPP-specific keywords.
     *
     * @param ajv - Optional existing Ajv instance to use instead of creating a new one
     * @returns Configured Ajv instance for Fastify schema compilation
     */
    static createServerAjvInstance(ajv?: Ajv): Ajv;
    /**
     * Creates an Ajv instance configured for OCPP message validation.
     * Does not coerce types since OCPP messages arrive as parsed JSON with correct types.
     * Includes OCPP-specific schema keywords and strict number/required validation.
     *
     * @param ajv - Optional existing Ajv instance to use instead of creating a new one
     * @returns Configured Ajv instance for OCPP message validation
     */
    static createValidatorAjvInstance(ajv?: Ajv): Ajv;
    /**
     * Adds custom keywords for OCPP schema metadata to an Ajv instance.
     * These keywords are used in OCPP JSON schemas but don't affect validation.
     *
     * @param ajv - The Ajv instance to add keywords to
     */
    static addOcppKeywords(ajv: Ajv): void;
    /**
     * Adds format validation for date-time and URI formats to an Ajv instance.
     *
     * @param ajv - The Ajv instance to add formats to
     */
    static addFormats(ajv: Ajv): void;
    /**
     * Validates an OCPP Request object against its schema.
     *
     * @param {CallAction} action - The original CallAction.
     * @param {OcppRequest} payload - The OCPP Request object to validate.
     * @param {OCPPVersion} protocol - The OCPP protocol version.
     * @return {boolean} - Returns true if the OCPP Request object is valid, false otherwise.
     */
    validateOCPPRequest(action: CallAction, payload: OcppRequest, protocol: OCPPVersion): {
        isValid: boolean;
        errors?: ErrorObject[] | null;
    };
    /**
     * Validates an OCPP Response against its schema.
     *
     * @param {CallAction} action - The original CallAction.
     * @param {OcppResponse} payload - The OCPPResponse object to validate.
     * @param {OCPPVersion} protocol - The OCPP protocol version.
     * @return {boolean} - Returns true if the OCPPResponse object is valid, false otherwise.
     */
    validateOCPPResponse(action: CallAction, payload: OcppResponse | OcppError, protocol: OCPPVersion): {
        isValid: boolean;
        errors?: ErrorObject[] | null;
    };
    /**
     * Prepares an OCPP Payload for sending by removing any null values, as OCPP does not allow null values in its messages.
     *
     * @param message OCPP Payload, as an object
     * @returns The sanitized OCPP Payload, with null values removed
     */
    sanitizeOCPPPayload<T extends OcppRequest | OcppResponse>(message: T): T;
    private removeNulls;
    private fixRefs;
}