import { ChatModel } from './chat-model';
import { SerializedChatData } from './chat-model-serialization';
import { ChatAgentLocation } from './chat-agents';
export declare const ChatSessionStore: unique symbol;
export interface ChatModelWithMetadata {
    model: ChatModel;
    title?: string;
    pinnedAgentId?: string;
    /** Timestamp (ms since epoch) of the last user interaction. Used as the display date for session cards. */
    lastInteraction?: number;
    /** Whether the last request ended with an error. */
    hasError?: boolean;
    /** ID of the root session in the delegation chain. */
    rootSessionId?: string;
    /** ID of the immediate parent session that delegated this one. */
    parentSessionId?: string;
}
export interface ChatSessionStore {
    /**
     * Stores the handed over sessions.
     *
     * Might overwrite existing sessions when maximum storage capacity is exceeded.
     */
    storeSessions(...sessions: Array<ChatModel | ChatModelWithMetadata>): Promise<void>;
    /**
     * Read specified session
     */
    readSession(sessionId: string): Promise<SerializedChatData | undefined>;
    /**
     * Delete specified session
     */
    deleteSession(sessionId: string): Promise<void>;
    /**
     * Deletes all sessions
     */
    clearAllSessions(): Promise<void>;
    /**
     * Get index of all stored sessions.
     * Note: This may trigger storage initialization if not already initialized.
     */
    getSessionIndex(): Promise<ChatSessionIndex>;
    /**
     * Check if there are persisted sessions available
     * This has the benefit of not initializing the storage on disk if it does not
     * already exist.
     */
    hasPersistedSessions(): Promise<boolean>;
}
export interface ChatSessionIndex {
    [sessionId: string]: ChatSessionMetadata;
}
export interface ChatSessionMetadata {
    sessionId: string;
    title: string;
    saveDate: number;
    location: ChatAgentLocation;
    /** ID of the agent pinned to the session (used for icon and display name on cards). */
    pinnedAgentId?: string;
    /** Whether the last request ended with an error. */
    hasError?: boolean;
    /** ID of the root session in the delegation chain. */
    rootSessionId?: string;
    /** ID of the immediate parent session that delegated this one. */
    parentSessionId?: string;
}
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