import type { GlucoseReading } from "./glucose-engine.js";
export interface LibreLinkUpAuth {
    /** JWT bearer token issued by /llu/auth/login. */
    token: string;
    /** Numeric account id; its SHA-256 hex digest goes in the `account-id` header. */
    accountId: string;
    /** Unix-epoch (seconds) expiry of the JWT, when supplied by the API. */
    expires?: number;
}
export interface LibreLinkUpConnection {
    /** patientId — pass to getGraph / getCurrent. */
    patientId: string;
    firstName?: string;
    lastName?: string;
    /** Sensor serial / device label, when present. */
    sensor?: string;
    /** Latest glucose measurement embedded in the connection record, if any. */
    latest?: GlucoseReading;
}
export interface LibreLinkUpClientOptions {
    email?: string;
    password?: string;
    region?: string;
    token?: string;
    accountId?: string;
    patientId?: string;
    fetchImpl?: typeof fetch;
}
export declare class LibreLinkUpClient {
    readonly email?: string;
    readonly password?: string;
    /** Active LibreLink Up region shard. May be updated once if login redirects. */
    region: string;
    readonly fixedPatientId?: string;
    private token?;
    private accountId?;
    private readonly fetchImpl;
    constructor(opts?: LibreLinkUpClientOptions);
    /** True when we have enough to authenticate: either email+password or an existing token. */
    hasAuth(): boolean;
    /** True once we hold a live bearer token. */
    isLoggedIn(): boolean;
    private base;
    private headers;
    /**
     * Authenticate against LibreLink Up. Stores the bearer token + account id on
     * the client and returns them. Follows one regional redirect if the API asks.
     */
    login(): Promise<LibreLinkUpAuth>;
    /** List the patients (sensors) this account follows. The account's own sensor is one of them. */
    getConnections(): Promise<LibreLinkUpConnection[]>;
    /** Resolve the patientId to query: explicit override, else the first connection. */
    resolvePatientId(): Promise<string>;
    /**
     * Fetch the recent glucose graph for a patient (~12h of historical points plus
     * the current measurement). Returns chronologically-sorted GlucoseReadings.
     */
    getGraph(patientId?: string): Promise<GlucoseReading[]>;
    /** Return the single most-recent reading for a patient (last point of the graph). */
    getCurrent(patientId?: string): Promise<GlucoseReading | null>;
}