import { Db, MongoClient } from 'mongodb';
export declare enum ConnectionStatus {
    /** The controller is currently connected to the database */
    Connected = 0,
    /** The controller is currently disconnected from the database */
    Disconnected = 1
}
/**
 * Controller for managing MongoDB connections and operations.
 */
export default class MongoController {
    readonly mongoClient: MongoClient;
    private readonly dbName;
    private _database?;
    /**
     * Tracks the current connection status.
     * @default ConnectionStatus.Disconnected
     * @private
     */
    private _connectionStatus;
    constructor(mongoClient: MongoClient, dbName: string);
    /**
     * Gets the current connection status.
     */
    get connectionStatus(): ConnectionStatus;
    /**
     * Gets the name of the configured database.
     */
    get databaseName(): string | null;
    /**
     * Gets the current database instance, if connected.
     */
    get db(): Db | undefined;
    /**
     * Gets the current database instance, cast as non-undefined.
     * Use with caution; throws if not connected.
     */
    get unsafeDB(): Db;
    /**
     * Ensures that there is an active connection to the database.
     * @throws Error if not connected
     */
    checkConnection(): void;
    /**
     * Disconnects from the MongoDB server.
     * If already disconnected, does nothing.
     * @returns promise that resolves to true if disconnection succeeded or was unnecessary,
     * or false if an error occurred during client.close()
     */
    disconnect(): Promise<boolean>;
    /**
     * Connects to the MongoDB server and selects the database.
     * If already connected, does nothing.
     */
    connect(): Promise<this>;
    /**
     * Retrieves a collection from the connected database.
     * @typeParam T shape of the documents in the collection
     * @param name name of the collection to access
     * @returns MongoDB Collection instance
     * @throws Error if not connected
     */
    collection<T extends object = any>(name: string): import('mongodb').Collection<T>;
}