import type { AgentSession } from "@earendil-works/pi-coding-agent";
import type { SessionModel } from "../types.js";
import { type ModelUsageDescriptor, type ModelUsageStatus } from "./model-usage-status.js";
export type AppModelUsageQuery = (descriptor: ModelUsageDescriptor) => Promise<ModelUsageStatus | undefined>;
export type ModelUsageRefreshResult = "refreshed" | "unavailable" | "failed";
export type ModelUsageRefreshStart = {
    kind: "started";
    promise: Promise<ModelUsageRefreshResult>;
} | {
    kind: "in-flight";
} | {
    kind: "unsupported";
};
export type AppModelUsageControllerHost = {
    runtimeSession(): AgentSession | undefined;
    draftSelection?(): {
        model: SessionModel;
        thinkingLevel: string;
    } | undefined;
    render(): void;
};
export declare class AppModelUsageController {
    private readonly host;
    private readonly queryUsageStatus;
    private activeModelKey;
    private readonly statuses;
    private readonly inFlightModelKeys;
    private readonly lastAttemptAt;
    private timer;
    constructor(host: AppModelUsageControllerHost, queryUsageStatus?: AppModelUsageQuery);
    startPolling(): void;
    stopPolling(): void;
    observeSession(session: AgentSession | undefined): void;
    statusLabel(): string;
    refreshNow(): ModelUsageRefreshStart;
    private tick;
    private refresh;
    private syncActiveModel;
    private activeStatus;
    private activeDescriptor;
}