import { EventBus } from "../helpers/event_bus";
import { SelectiveHistory as RevisionLog } from "../history/selective_history";
import { Client, ClientId, ClientPosition, CollaborativeEvent } from "../types/collaborative/session";
import { CollaborationMessage, StateUpdateMessage, TransportService } from "../types/collaborative/transport_service";
import { Command, CoreCommand } from "../types/commands";
import { HistoryChange } from "../types/history";
import { Lazy, UID } from "../types/misc";
import { WorkbookData } from "../types/workbook_data";
import { ICommandSquisher } from "./command_squisher";
import { Revision } from "./revisions";
export declare class ClientDisconnectedError extends Error {
}
export declare class Session extends EventBus<CollaborativeEvent> {
    private revisions;
    private transportService;
    private serverRevisionId;
    private commandSquisher;
    /**
     * Positions of the others client.
     */
    private clients;
    private clientId;
    private pendingMessages;
    /**
     * Stored position of the client, if session.move is called while the client is not in a session.
     * Will be used to send the position to the server when the client joins.
     */
    private awaitingClientPosition;
    private waitingAck;
    /**
     * Flag used to block all commands when an undo or redo is triggered, until
     * it is accepted on the server
     */
    private waitingUndoRedoAck;
    private isReplayingInitialRevisions;
    private processedRevisions;
    private lastRevisionMessage;
    private uuidGenerator;
    private lastLocalOperation;
    /**
     * Manages the collaboration between multiple users on the same spreadsheet.
     * It can forward local state changes to other users to ensure they all eventually
     * reach the same state.
     * It also manages the positions of each client in the spreadsheet to provide
     * a visual indication of what other users are doing in the spreadsheet.
     *
     * @param revisions
     * @param transportService communication channel used to send and receive messages
     * between all connected clients
     * @param serverRevisionId
     * @param commandSquisher used to squish and unsquish commands to reduce the size of messages sent to the server
     */
    constructor(revisions: RevisionLog<Revision>, transportService: TransportService<CollaborationMessage>, serverRevisionId: UID | undefined, commandSquisher: ICommandSquisher);
    canApplyOptimisticUpdate(): boolean;
    /**
     * Add a new revision to the collaborative session.
     * It will be transmitted to all other connected clients.
     */
    save(rootCommand: Command, commands: CoreCommand[], changes: HistoryChange[]): void;
    undo(revisionId: UID): void;
    redo(revisionId: UID): void;
    join(client?: Client): void;
    loadInitialMessages(messages: StateUpdateMessage[]): void;
    /**
     * Notify the server that the user client left the collaborative session
     */
    leave(data?: Lazy<WorkbookData>): Promise<void>;
    /**
     * Send a snapshot of the spreadsheet to the collaboration server
     */
    snapshot(data: WorkbookData): Promise<void>;
    getCurrentClient(): Client;
    getClient(clientId: ClientId): Client;
    getConnectedClients(): Set<Client>;
    getRevisionId(): UID;
    isFullySynchronized(): boolean;
    /**
     * Get the last local revision
     * */
    getLastLocalNonEmptyRevision(): Revision | undefined;
    /**
     * Notify that the position of the client has changed
     */
    move(position: ClientPosition): void;
    /**
     * Handles messages received from other clients in the collaborative
     * session.
     */
    private onMessageReceived;
    private onClientMoved;
    /**
     * Register the new client and send your
     * own position back.
     */
    private onClientJoined;
    private onClientLeft;
    private sendUpdateMessage;
    private sendToTransport;
    /**
     * Send the next pending message
     */
    private sendPendingMessage;
    private acknowledge;
    private isAlreadyProcessed;
    isWrongServerRevisionId(message: CollaborationMessage): boolean;
    private dropPendingHistoryMessages;
}