import { CsatMessage, Message, QuickReplyMessage } from '@rasahq/chat-widget-sdk';
/**
 * sessionStorage key used to remember which CSAT prompt the user has already
 * answered. The value is a stable content hash of the prompt - not just a
 * boolean - so that a server-side replay of the same message after a refresh
 * is correctly recognised as already-answered, instead of being treated as a
 * fresh ask that re-opens the thumbs popup.
 */
export declare const CSAT_ANSWERED_HASH_STORAGE_KEY = "rasa-csat-answered-hash";
export type CsatLikeMessage = CsatMessage | QuickReplyMessage;
export interface CsatPayloads {
    satisfied?: string;
    unsatisfied?: string;
}
/**
 * Inspects a buttons message and returns the CSAT option payloads when it is
 * a satisfaction request. Returns null when the message is a normal
 * quick-reply (i.e. its button text/payloads do not match the `satisfied` /
 * `unsatisfied` vocabulary).
 *
 * Pure function so we can unit-test the heuristic in isolation.
 */
export declare function detectCsatButtons(message: QuickReplyMessage): CsatPayloads | null;
/**
 * Produces a stable content hash for a CSAT prompt that is robust to the
 * non-stable fields that vary between a fresh push and a server replay
 * (timestamps, sender, etc.). Two CSAT prompts with the same question and
 * the same option vocabulary will hash identically.
 */
export declare function getCsatMessageHash(message: CsatLikeMessage): string;
interface StorageLike {
    getItem(key: string): string | null;
    setItem(key: string, value: string): void;
    removeItem(key: string): void;
}
/**
 * Returns true iff the provided CSAT prompt has already been answered in the
 * current browser tab (sessionStorage). The hash comparison means a server
 * replay of the same prompt after a page refresh is treated as
 * "already answered", which fixes the bug where the popup briefly re-appeared
 * after rating + refresh.
 */
export declare function isCsatAnsweredFor(message: CsatLikeMessage, storage?: StorageLike | null): boolean;
export declare function markCsatAnswered(message: CsatLikeMessage, storage?: StorageLike | null): void;
export declare function clearCsatAnswered(storage?: StorageLike | null): void;
/**
 * Returns the index of the last non-divider message, or -1 when the history
 * only contains dividers (or is empty). Session dividers are transparent for
 * "is the popup still pending?" purposes because every page refresh appends
 * a new (often empty) session entry, which would otherwise push real bot
 * turns out of the "last message" slot from the second refresh onwards.
 */
export declare function findLastContentIndex(history: Message[]): number;
export {};