import type Datastore from '../Datastore';
import Ajv from 'ajv';
import * as jsonpatch from 'fast-json-patch';
import { MultiQuery } from '../utils';
/**
 * Type of steps
 * - fetch
 * - map
 * - unset
 * - validate
 * - each
 * - filter
 * - op
 *
 * - parallel
 * - request
 * - json_patch
 */
export declare const STEP_TYPE_FETCH = "fetch";
export declare const STEP_TYPE_JSON_PATCH = "json_patch";
export declare const STEP_TYPE_MAP = "map";
export declare const STEP_TYPE_UNSET = "unset";
export declare const STEP_TYPE_VALIDATE = "validate";
export declare const STEP_TYPE_EACH = "each";
export declare const STEP_TYPE_IF = "if";
export declare const STEP_TYPE_FILTER = "filter";
export declare const STEP_TYPE_OP = "op";
export declare const STEP_TYPE_PERSIST = "persist";
export declare const STEP_TYPE_FROM = "from";
export declare const DEFAULT_STEP_TYPES: readonly string[];
export interface StepDefinition {
    handler: Function;
    schema?: object;
    name?: string;
    description?: string;
}
export interface StepMapItem {
    from: string;
    to: string;
    default: any;
    must_hash?: boolean;
    json_stringify?: boolean;
    relative_date_in_seconds?: number;
}
export interface StepFetch {
    type: string;
    name?: string;
    description?: string;
    destination?: string;
    datastore?: string;
    model: string;
    source?: MultiQuery['source'];
    query?: object;
    headers?: any;
    map?: StepMapItem[];
    timetravel?: string;
    correlation_field?: string;
    page?: number;
    page_size?: number;
    as_entity?: boolean;
    must_decrypt?: boolean;
    default?: any;
}
export interface StepPersist {
    type: string;
    name?: string;
    description?: string;
    destination: string;
    datastore?: string;
    model: string;
    correlation_field?: string;
    payload: any;
    headers?: any;
    map?: StepMapItem[];
    imperative_version_next?: string;
}
export interface StepJsonPatch {
    type: string;
    name?: string;
    description?: string;
    patch: jsonpatch.Operation[];
}
export interface StepMap {
    type: string;
    name?: string;
    description?: string;
    map: StepMapItem[];
}
/**
 * @deprecated in favor of JSON Patch
 */
export interface StepUnset {
    type: string;
    name?: string;
    description?: string;
    path: string;
}
export interface StepValidate {
    type: string;
    name?: string;
    description?: string;
    schema: object;
    path?: string;
    must_throw?: boolean;
    destination?: string;
}
export interface StepEach {
    type: string;
    name?: string;
    description?: string;
    path: string;
    pipeline: Step[];
    destination?: string;
}
export interface StepIf {
    type: string;
    name?: string;
    description?: string;
    path: string;
    schema: object;
    pipeline: Step[];
    destination?: string;
    repeat_while_true?: boolean;
    max_iteration_count?: number;
}
export interface StepFilter {
    type: string;
    name?: string;
    description?: string;
    path: string;
    schema: object;
    destination?: string;
    map?: StepMapItem[];
    as_entity?: boolean;
    default?: any;
}
export interface StepOpArg {
    path: string;
    default: number;
    func: string;
}
export interface StepOp {
    type: string;
    name?: string;
    description?: string;
    func: string;
    args: StepOpArg[];
    path?: string;
    destination?: string;
    default?: any;
    args_as_array?: boolean;
}
export interface StepFrom {
    type: string;
    name?: string;
    description?: string;
    path: string;
}
export type Step = StepFetch | StepJsonPatch | StepMap | StepUnset | StepValidate | StepEach | StepIf | StepFilter | StepOp | StepFrom;
export type Aggregation = {
    [key: string]: any;
};
export default class Aggregator {
    datastores: Map<string, Datastore>;
    steps: Map<string, StepDefinition>;
    logs: {
        level: string;
        msg: string;
        ts: number;
        context?: any;
    }[];
    static pipelineValidator: Ajv;
    static ERROR_INVALID_PIPELINE_DEFINITION: Error;
    static ERROR_INVALID_STEP_TYPE: Error;
    static ERROR_ENTITY_NOT_FOUND: Error;
    static ERROR_DESTINATION_UNDEFINED: Error;
    static ERROR_CONFLICT_STEP_TYPE: Error;
    static ERROR_CONTRACT_ERROR_STEP_TYPE: Error;
    static ERROR_VALIDATE_STEP_FAILED: Error;
    static ERROR_ITERATE_STEP_IS_NOT_ARRAY: Error;
    static ERROR_OP_STEP_INVALID_VALUE: Error;
    static ERRORS: Error[];
    config: {
        max_retry: number;
    };
    metrics: {
        started_at_in_ms?: number;
        ended_at_in_ms?: number;
        elapsed_time_in_ms?: number;
        iteration?: number;
    };
    private _pipelineValidator;
    constructor(datastores: Map<string, Datastore>, config?: {
        max_retry: number;
    });
    static _customizer(objValue: any, srcValue: any): any[] | undefined;
    get pipelineValidator(): Ajv;
    log(level: string, msg: string, context?: any): void;
    addStepType(stepType: string, stepDefinition: StepDefinition): this;
    removeStepType(stepType: string): this;
    updateValidator(): void;
    mergeData(step: StepFetch | StepFilter, data?: Aggregation, results?: object[], destination?: string | undefined): Aggregation;
    static ok(condition: boolean, message: string): void;
    static hash(value: any): string;
    applyPatch(data: Aggregation, patch: jsonpatch.Operation[]): Aggregation;
    applyMap(source?: object, map?: StepMapItem[], data?: Aggregation | null): object;
    fetch(step: StepFetch, data?: Aggregation): Promise<object[]>;
    getDatastore(datastore: string | undefined): Datastore;
    persist(step: StepPersist, data?: Aggregation): Promise<any>;
    runStepFetch(step: StepFetch, data?: Aggregation): Promise<Aggregation>;
    runStepPersist(step: StepPersist, data?: Aggregation): Promise<Aggregation>;
    runStepJsonPatch(step: StepJsonPatch, data?: Aggregation): Promise<Aggregation>;
    runStepMap(step: StepMap, data?: Aggregation): Promise<Aggregation>;
    runStepUnset(step: StepUnset, data?: Aggregation): Promise<Aggregation>;
    runStepValidate(step: StepValidate, data?: Aggregation): Promise<Aggregation>;
    runStepEach(step: StepEach, data?: Aggregation): Promise<Aggregation>;
    runStepIf(step: StepIf, data?: Aggregation, i?: number): Promise<Aggregation>;
    runStepFilter(step: StepFilter, data?: Aggregation): Promise<Aggregation>;
    /**
     * @alpha
     */
    runStepOp(step: StepOp, data?: Aggregation | null): Promise<Aggregation>;
    runStepFrom(step: StepFrom, data?: Aggregation): Promise<Aggregation>;
    runStep(step: Step, data?: Aggregation): Promise<Aggregation>;
    validate(pipeline: Step[]): void;
    aggregate(pipeline: Step[], initialData?: Aggregation, iteration?: number): Promise<Aggregation>;
}