import type { AgentMessage } from '@earendil-works/pi-agent-core';
import { type Api, type Model } from '@earendil-works/pi-ai/compat';
export interface CompactionResult {
    summary: string;
    firstKeptIndex: number;
    tokensBefore: number;
    tokensAfter: number;
    compacted: boolean;
    plannerVersion?: number;
    summaryModelRef?: string;
    qualityAudit?: 'passed' | 'disabled';
    compactedUsage?: {
        input: number;
        output: number;
        total: number;
        cost?: number;
    };
}
export interface CompactionConfig {
    enabled: boolean;
    triggerThreshold: number;
    minMessagesBeforeCompact: number;
    keepRecentTokens: number;
    recentTurnsPreserve: number;
    summaryMaxTokens: number;
    summaryChunkTokens: number;
    summaryTimeoutMs: number;
    summaryRetries: number;
    qualityGuard: boolean;
    accumulateUsage: boolean;
}
export interface CompactionExecutionOptions {
    fallbackModels?: Array<Model<Api>>;
    signal?: AbortSignal;
}
export declare const DEFAULT_COMPACTION_CONFIG: CompactionConfig;
interface MessageUsage {
    input: number;
    output: number;
    total: number;
    cost?: number;
}
export declare function accumulateUsage(messages: AgentMessage[]): MessageUsage | undefined;
export declare class SessionCompactor {
    private readonly config;
    constructor(config?: Partial<CompactionConfig>);
    getConfig(): Readonly<CompactionConfig>;
    compact(messages: AgentMessage[], model: Model<Api>, instructions?: string, force?: boolean, options?: CompactionExecutionOptions): Promise<CompactionResult>;
    private generateSummary;
    private callSummaryModels;
    applyCompaction(messages: AgentMessage[], result: CompactionResult): AgentMessage[];
    estimateTotalTokens(messages: AgentMessage[]): number;
}
export {};