import type { Api, Model } from "@bastani/pi-ai";
import type { AssistantMessage } from "@bastani/pi-ai/compat";
import type { SessionEntry } from "./session-manager.ts";
export interface CacheMiss {
    missedTokens: number;
    missedCost: number;
    idleMs: number;
    modelChanged: boolean;
    cacheExpired: boolean;
}
export interface CacheWasteTotals {
    missedTokens: number;
    missedCost: number;
    missCount: number;
}
export interface ModelPriceSource {
    getModel(provider: string, modelId: string): {
        cost: {
            cacheRead: number;
        };
    } | undefined;
    getPromptCacheTtlMs?(provider: string, modelId: string): number | undefined;
}
export declare function createCacheMissModelSource(runtime: {
    getModel(provider: string, modelId: string): Model<Api> | undefined;
}): ModelPriceSource;
export declare function describeCacheMissCause(miss: CacheMiss): string;
export declare function computeCacheWaste(entries: SessionEntry[], models: ModelPriceSource): CacheWasteTotals;
export declare function collectCacheMisses(entries: SessionEntry[], models: ModelPriceSource): Map<AssistantMessage, CacheMiss>;
export declare function detectCacheMiss(entries: SessionEntry[], message: AssistantMessage, models: ModelPriceSource): CacheMiss | undefined;
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