import { Client } from "@microsoft/microsoft-graph-client";
import { OutlookDeltaLinkRepository } from "../../repositories/outlook-delta-link.repository";
import { ResourceType } from "../../enums/resource-type.enum";
import { Event, Message } from "../../types";
import { UserIdConverterService } from "./user-id-converter.service";
import { GraphRateLimiterService } from "./graph-rate-limiter.service";
export interface DeltaItem {
    lastModifiedDateTime?: string;
    createdDateTime?: string;
    id?: string;
    "@removed"?: {
        reason: "changed" | "deleted";
    };
}
export type DeltaEvent = Event & DeltaItem;
export type DeltaMessage = Message & DeltaItem;
export interface DeltaResponse<T> {
    "@odata.nextLink"?: string;
    "@odata.deltaLink"?: string;
    value: T[];
}
export declare class DeltaSyncError extends Error {
    readonly code: string;
    readonly statusCode: number;
    constructor(message: string, code: string, statusCode: number);
}
export declare class DeltaSyncService {
    private readonly deltaLinkRepository;
    private readonly userIdConverter;
    private readonly rateLimiter;
    private readonly logger;
    private readonly MAX_RETRIES;
    private readonly RETRY_DELAY_MS;
    constructor(deltaLinkRepository: OutlookDeltaLinkRepository, userIdConverter: UserIdConverterService, rateLimiter: GraphRateLimiterService);
    private handleDeltaResponse;
    private calculateTokenExpiry;
    private handleReplays;
    private sortDeltaItems;
    private fetchEventDetailsWithConcurrencyLimit;
    private fetchDeltaPagesCore;
    private fetchAllDeltaPages;
    fetchAndSortChanges(client: Client, requestUrl: string, externalUserId: string, forceReset?: boolean, dateRange?: {
        startDate: Date;
        endDate: Date;
    }): Promise<DeltaItem[]>;
    private is410Error;
    streamDeltaChanges(client: Client, requestUrl: string, externalUserId: string, forceReset?: boolean, dateRange?: {
        startDate: Date;
        endDate: Date;
    }, saveDeltaLink?: boolean): AsyncGenerator<DeltaItem[], string | null, unknown>;
    initializeDeltaLink(client: Client, requestUrl: string, internalUserId: number, resourceType: ResourceType, dateRange?: {
        startDate: Date;
        endDate: Date;
    }): Promise<DeltaItem[]>;
    saveDeltaLink(internalUserId: number, resourceType: ResourceType, deltaLink: string): Promise<void>;
    getDeltaLink<T>(response: DeltaResponse<T>): string | null;
}