import { type SessionTreeEntry } from "@earendil-works/pi-agent-core";
import { type Message, type Tool } from "@earendil-works/pi-ai";
export interface SessionStaticContext {
    systemPrompt?: string;
    tools?: Tool[];
}
export interface SessionState {
    sessionId: string;
    staticContext: SessionStaticContext | undefined;
    staticContextHash: string;
    entries: SessionTreeEntry[];
    leafId: string | null;
    treeHash: string;
    prefixHashes: string[];
    messages: Message[];
    revision: number;
    createdAt: number;
    updatedAt: number;
    persistenceChange: SessionPersistenceChange | undefined;
}
export interface SessionSummary {
    sessionId: string;
    staticContextHash: string;
    treeHash: string;
    messageCount: number;
    entryCount: number;
    leafId: string | null;
    revision: number;
    createdAt: number;
    updatedAt: number;
}
export interface PersistedSessionState {
    sessionId: string;
    staticContext: SessionStaticContext | undefined;
    entries: SessionTreeEntry[];
    leafId: string | null;
    revision: number;
    createdAt: number;
    updatedAt: number;
}
export type SessionPersistenceChange = {
    kind: "snapshot";
} | {
    kind: "wal";
    entries: SessionTreeEntry[];
};
export declare function getOrCreateSession(sessionId: string): SessionState;
export declare function getSession(sessionId: string): SessionState | undefined;
export declare function hashSessionEntries(entries: SessionTreeEntry[]): string;
export declare function listSessions(): SessionSummary[];
export declare function exportSessionState(session: SessionState): PersistedSessionState;
export declare function restoreSessionState(persisted: PersistedSessionState): SessionState;
export declare function setStaticContext(sessionId: string, context: SessionStaticContext): SessionState;
export declare function getSessionBranch(session: SessionState): SessionTreeEntry[];
export declare function replaceSessionTree(sessionId: string, entries: SessionTreeEntry[], leafId: string | null): SessionState;
export declare function appendSessionEntries(sessionId: string, entries: SessionTreeEntry[], leafId: string | null): SessionState;
export declare function switchSessionLeaf(sessionId: string, leafId: string | null): SessionState;
export declare function appendCompactionEntry(sessionId: string, compaction: {
    summary: string;
    firstKeptEntryId: string;
    tokensBefore: number;
    details?: unknown;
}): {
    session: SessionState;
    entry: SessionTreeEntry;
};
export declare function appendMessages(sessionId: string, delta: Message[]): SessionState;
export declare function replaceMessages(sessionId: string, messages: Message[]): SessionState;
export declare function deleteSession(sessionId: string): boolean;
export declare function clearAllSessions(): void;
export declare function markSessionPersisted(session: SessionState): void;
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