export interface AltchaGlobal {
    algorithms: Map<string, () => Worker | Promise<Worker>>;
    defaults: Store<Partial<Configuration>>;
    i18n: Store<Record<string, Record<string, string>>>;
    instances: Set<HTMLElement>;
    plugins: Set<new (host: HTMLElement & WidgetMethods) => any>;
}
export declare enum AudioState {
    ERROR = "error",
    LOADING = "loading",
    PLAYING = "playing",
    PAUSED = "paused",
    READY = "ready"
}
export interface Configuration {
    /**
     * Forces a specific language for audio-based challenges.
     */
    audioChallengeLanguage: string;
    /**
     * Determines when verification triggers automatically.
     * @default 'off'
     */
    auto: 'off' | 'onfocus' | 'onload' | 'onsubmit';
    /**
     * Vertical position of the widget when `display` is set to `bar`.
     */
    barPlacement: 'bottom' | 'top';
    /**
     * The challenge data or the URL to fetch a new challenge from.
     */
    challenge: Challenge | string | null;
    /**
     * A specific code-challenge object. Overrides values provided in the `challenge` property.
     */
    codeChallenge: CodeChallenge | null;
    /**
     * The UI layout used for the code-challenge modal.
     */
    codeChallengeDisplay: 'standard' | 'overlay' | 'bottomsheet';
    /**
     * Defines how credentials (cookies/auth headers) are handled during the challenge request.
     */
    credentials: RequestCredentials | null;
    /**
     * Enables verbose logging in the browser console for debugging.
     */
    debug: boolean;
    /**
     * Prevents the code-challenge modal from stealing focus when opened.
     */
    disableAutoFocus: boolean;
    /**
     * The visual layout mode of the widget.
     */
    display: 'standard' | 'bar' | 'floating' | 'overlay' | 'invisible';
    /**
     * A custom `fetch` implementation for network requests.
     */
    fetch: typeof fetch;
    /**
     * The element or CSS selector the floating UI attaches to.
     * Defaults to the first `submit` button in the parent form.
     */
    floatingAnchor: string | HTMLElement | null;
    /**
     * Vertical offset (in pixels) between the floating UI and its anchor.
     * @default 12
     */
    floatingOffset: number;
    /**
     * Controls whether the floating widget remains visible after successful verification.
     */
    floatingPersist: boolean | 'focus';
    /**
     * Preferred position of the floating widget relative to the anchor.
     */
    floatingPlacement: 'auto' | 'bottom' | 'top';
    /**
     * Hides the "ALTCHA" attribution link.
     */
    hideFooter: boolean;
    /**
     * Hides the ALTCHA logo icon.
     */
    hideLogo: boolean;
    /**
     * Enables the collection of pointer and scroll events for ALTCHA HIS mechanism (defaults to true).
     */
    humanInteractionSignature: boolean;
    /**
     * The ISO alpha-2 language code for localization (requires corresponding i18n file).
     */
    language: string;
    /**
     * The minimum verification time in milliseconds (adds an artificial delay if the PoW is faster).
     * @default 500
     */
    minDuration: number;
    /**
     * Forces the widget into a failed state with a mock error for UI testing.
     */
    mockError: boolean;
    /**
     * The `name` attribute of the hidden input field containing the payload.
     * @default 'altcha'
     */
    name: string;
    /**
     * CSS selector for an element to be mirrored inside the overlay modal.
     */
    overlayContent: string | null;
    /**
     * Configures the placement (top / bottom) for popovers. Defaults to 'auto'.
     */
    popoverPlacement: 'auto' | 'bottom' | 'top';
    /**
     * Automatically attempts to restart verification with fewer workers if the browser runs out of memory (Argon2 and Scrypt only).
     */
    retryOnOutOfMemoryError: boolean;
    /**
     * Includes other form field values in the server-side verification request.
     */
    serverVerificationFields: boolean;
    /**
     * Includes the user's time zone in the server-side verification request.
     */
    serverVerificationTimeZone: boolean;
    /**
     * When set, the widget will set a configured cookie for the payload instead of sending it as form field.
     */
    setCookie: SetCookieOptions | null;
    /**
     * Mocks a successful verification. Useful for testing environments without network access.
     */
    test: boolean;
    /**
     * PoW verification timeout in milliseconds. Defaults to 90_000 ms.
     */
    timeout: number;
    /**
     * The visual style of the interaction element.
     */
    type: 'native' | 'checkbox' | 'switch';
    /**
     * Custom validation message for the HTML5 `setCustomValidity` API.
     */
    validationMessage: string;
    /**
     * A custom verification handler. Overrides the default network-based verification.
     */
    verifyFunction: ((payload: string, code?: string) => Promise<ServerVerificationResult | null>) | null;
    /**
     * The endpoint URL for server-side verification.
     */
    verifyUrl: string | null;
    /**
     * The number of Web Workers to spawn for proof-of-work calculations.
     */
    workers: number;
}
export interface Challenge {
    codeChallenge?: CodeChallenge;
    parameters: ChallengeParameters;
    signature?: string;
}
export interface ChallengeParameters {
    algorithm: string;
    nonce: string;
    salt: string;
    cost: number;
    keyLength: number;
    keyPrefix: string;
    keySignature?: string;
    memoryCost?: number;
    parallelism?: number;
    expiresAt?: number;
    data?: Record<string, string | number | boolean | null>;
}
export interface ChallengeV1 {
    algorithm: string;
    challenge: string;
    codeChallenge?: CodeChallenge;
    salt: string;
    maxnumber?: number;
    maxNumber?: number;
    signature: string;
}
export interface CodeChallenge {
    image: string;
    audio?: string;
    length?: number;
}
export interface CreateChallengeOptions {
    algorithm: string;
    counter?: number;
    counterMode?: 'uint32' | 'string';
    cost: number;
    data?: Record<string, string | number | boolean | null>;
    deriveKey: DeriveKeyFunction;
    expiresAt?: number | Date;
    hmacAlgorithm?: HmacAlgorithm;
    hmacKeySignatureSecret?: string;
    hmacSignatureSecret?: string;
    keyLength?: number;
    keyPrefix?: string;
    keyPrefixLength?: number;
    memoryCost?: number;
    parallelism?: number;
}
export interface CSSVariables {
    '--altcha-border-color': string;
    '--altcha-border-width': string;
    '--altcha-border-radius': string;
    '--altcha-color-base': string;
    '--altcha-color-base-content': string;
    '--altcha-color-error': string;
    '--altcha-color-error-content': string;
    '--altcha-color-neutral': string;
    '--altcha-color-neutral-content': string;
    '--altcha-color-primary': string;
    '--altcha-color-primary-content': string;
    '--altcha-color-success': string;
    '--altcha-color-success-content': string;
    '--altcha-checkbox-border-color': string;
    '--altcha-checkbox-border-radius': string;
    '--altcha-checkbox-border-width': string;
    '--altcha-checkbox-outline': string;
    '--altcha-checkbox-outline-offset': string;
    '--altcha-checkbox-size': string;
    '--altcha-checkbox-transition-duration': string;
    '--altcha-input-background-color': string;
    '--altcha-input-border-radius': string;
    '--altcha-input-border-width': string;
    '--altcha-max-width': string;
    '--altcha-padding': string;
    '--altcha-popover-arrow-size': string;
    '--altcha-popover-color': string;
    '--altcha-shadow': string;
    '--altcha-spinner-color': string;
    '--altcha-switch-background-color': string;
    '--altcha-switch-border-radius': string;
    '--altcha-switch-height': string;
    '--altcha-switch-padding': string;
    '--altcha-switch-width': string;
    '--altcha-switch-toggle-border-radius': string;
    '--altcha-switch-toggle-color': string;
    '--altcha-switch-toggle-size': string;
    '--altcha-transition-duration': string;
    '--altcha-z-index': string | number;
    '--altcha-z-index-popover': string | number;
}
export type DeriveKeyFunction = (parameters: ChallengeParameters, salt: Uint8Array, password: Uint8Array) => Promise<DeriveKeyFunctionResult>;
export interface DeriveKeyFunctionResult {
    parameters?: Partial<ChallengeParameters>;
    derivedKey: Uint8Array;
}
export declare enum HmacAlgorithm {
    SHA_256 = "SHA-256",
    SHA_384 = "SHA-384",
    SHA_512 = "SHA-512"
}
export interface Payload {
    challenge: Omit<Challenge, 'codeChallenge'>;
    solution: Solution;
}
export interface PayloadV1 {
    algorithm: string;
    challenge: string;
    number: number;
    salt: string;
    signature?: string;
    took: number;
}
export interface SetCookieOptions {
    domain?: string;
    name?: string;
    maxAge?: number;
    path?: string;
    sameSite?: string;
    secure?: boolean;
}
export type ServerClassification = 'BAD' | 'GOOD' | 'NEUTRAL';
export interface ServerSignaturePayload {
    algorithm: string;
    apiKey?: string;
    id?: string;
    signature: string;
    verificationData: string;
    verified: boolean;
}
export interface ServerSignatureVerificationData {
    [key: string]: string | unknown;
    classification?: ServerClassification;
    email?: string;
    expire?: number;
    fields?: string[];
    fieldsHash?: string;
    id?: string;
    ipAddress?: string;
    reasons?: string[];
    score?: number;
    time?: number;
    verified?: boolean;
}
export interface ServerVerificationResult {
    algorithm?: string;
    apiKey?: string;
    id?: string;
    payload?: string;
    reason?: string;
    score?: number;
    signature?: string;
    verificationData?: string;
    verified?: boolean;
}
export interface SolveChallengeOptions {
    challenge: Challenge;
    controller?: AbortController;
    counterStart?: number;
    counterStep?: number;
    counterMode?: 'uint32' | 'string';
    deriveKey: DeriveKeyFunction;
    timeout?: number;
}
export interface Strings {
    ariaLinkLabel: string;
    enterCode: string;
    enterCodeAria: string;
    error: string;
    expired: string;
    footer: string;
    getAudioChallenge: string;
    label: string;
    loading: string;
    reload: string;
    verify: string;
    verificationRequired: string;
    verified: string;
    verifying: string;
    waitAlert: string;
}
export declare enum State {
    CODE = "code",
    ERROR = "error",
    VERIFIED = "verified",
    VERIFYING = "verifying",
    UNVERIFIED = "unverified",
    EXPIRED = "expired"
}
export interface Solution {
    counter: number;
    derivedKey: string;
    time?: number;
}
export type Store<T extends object, K extends keyof T = keyof T> = {
    get: (name: K) => T[K];
    set: <N extends K>(name: N | T, value?: T[N]) => void;
    store: Writable<T>;
};
export interface VerifyOptions {
    concurrency?: number;
    controller?: AbortController;
    minDuration?: number;
}
export interface VerifyResult {
    challenge?: Challenge;
    payload: string;
    solution?: Solution;
}
export interface VerifyServerSignatureResult extends VerifySolutionResult {
    verificationData?: ServerSignatureVerificationData | null;
}
export interface VerifySolutionOptions {
    challenge: Challenge;
    counterMode?: 'uint32' | 'string';
    deriveKey: DeriveKeyFunction;
    hmacAlgorithm?: HmacAlgorithm;
    hmacKeySignatureSecret?: string;
    hmacSignatureSecret: string;
    solution: Solution;
}
export interface VerifySolutionResult {
    expired: boolean;
    invalidSignature: boolean | null;
    invalidSolution: boolean | null;
    time: number;
    verified: boolean;
}
export interface WidgetAttributes extends Partial<Pick<Configuration, 'auto' | 'display' | 'language' | 'name' | 'type'>> {
    challenge?: string;
    configuration?: string;
}
export interface WidgetMethods {
    configure: (config: Partial<Configuration>) => Promise<void>;
    getConfiguration: () => Configuration;
    getState: () => State;
    hide: () => void;
    reset: (newState?: State, err?: string | null) => void;
    setState: (newState: State, err?: string | null) => void;
    show: () => void;
    updateUI: () => void;
    verify: (options?: VerifyOptions) => Promise<VerifyResult | null>;
}
export type Writable<T = Record<string, Record<string, string>>> = {
    set(this: void, value: T): void;
    update(this: void, updater: (value: T) => T): void;
    subscribe(this: void, run: (value: T) => void, invalidate?: () => void): () => void;
};