/**
 * Pluggable persistence contract for conversation state.
 *
 * Telbany implements this with Mongoose (Thread.openai_conversation_id / last_response_id).
 * The SDK ships a MemoryConversationStore for tests and lightweight use cases.
 *
 * threadKey — the app-level identifier (e.g. Thread.thread_id from MongoDB).
 */
export interface ConversationState {
    conversationId: string;
    lastResponseId?: string;
}
export interface ConversationStore {
    /** Load state for a thread. Returns null when no conversation has been created yet. */
    load(threadKey: string): Promise<ConversationState | null>;
    /** Persist updated state after each turn. */
    save(threadKey: string, state: ConversationState): Promise<void>;
    /**
     * Create a new conversation and persist it.
     * Called when load() returns null and a new conversation must be created.
     */
    create(threadKey: string, conversationId: string): Promise<ConversationState>;
}
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