import type { AcousticSignal } from "./packets.js";
export interface WordTiming {
    readonly word: string;
    readonly startMs: number;
    readonly endMs: number;
    readonly confidence: number;
}
export type InteractionObservation = {
    readonly kind: "vad_speech_started";
    readonly contextId: string;
    readonly timestampMs: number;
    readonly confidence: number;
    readonly interruptedContextId?: string;
} | {
    readonly kind: "vad_speech_activity";
    readonly contextId: string;
    readonly timestampMs: number;
} | {
    readonly kind: "vad_speech_ended";
    readonly contextId: string;
    readonly timestampMs: number;
    readonly hasActiveTts: boolean;
} | {
    readonly kind: "vad_barge_in_audio";
    readonly contextId: string;
    readonly timestampMs: number;
    readonly audio: Uint8Array;
} | {
    readonly kind: "stt_partial";
    readonly contextId: string;
    readonly timestampMs: number;
    readonly text: string;
    readonly confidence?: number;
    readonly interruptedContextId?: string;
    readonly wordTimings?: readonly WordTiming[];
} | {
    readonly kind: "stt_final";
    readonly contextId: string;
    readonly timestampMs: number;
    readonly text: string;
    readonly confidence?: number;
    readonly interruptedContextId?: string;
    readonly wordTimings?: readonly WordTiming[];
} | {
    readonly kind: "audio_frame";
    readonly contextId: string;
    readonly timestampMs: number;
    readonly audio?: Int16Array;
    readonly sampleRateHz?: number;
    readonly wordTimings?: readonly WordTiming[];
    readonly prosody?: Float32Array;
} | {
    readonly kind: "playout_tick";
    readonly contextId: string;
    readonly timestampMs: number;
    readonly playedOutMs?: number;
    readonly ttsActive?: boolean;
    /** PCM queued for assistant playout. Present on audio-bearing ticks. */
    readonly audio?: Int16Array;
    readonly sampleRateHz?: number;
} | {
    readonly kind: "delegate_state";
    readonly contextId: string;
    readonly timestampMs: number;
    readonly delegateInFlight?: boolean;
    readonly toolCallPhase?: "started" | "delayed" | "complete" | "failed";
};
export type InteractionDecision = {
    readonly kind: "keep_listening";
} | {
    readonly kind: "take_turn";
    readonly confidence: number;
    readonly waitMs?: number;
}
/** `cue` is a stable pre-cached asset id (e.g. `mm_hmm`), not free-form text. */
 | {
    readonly kind: "backchannel";
    readonly cue: string;
} | {
    readonly kind: "hold";
} | {
    readonly kind: "interrupt";
    readonly interruptedContextId: string;
};
export interface AcousticSignalObservation {
    readonly contextId: string;
    readonly timestampMs: number;
    readonly signal: AcousticSignal;
    readonly payload?: Readonly<Record<string, unknown>>;
}
export type AcousticSignalSink = (signal: AcousticSignalObservation) => void;
export interface InteractionPolicy {
    observe(obs: InteractionObservation): readonly InteractionDecision[];
    reset(contextId: string): void;
    setAcousticSignalSink?(sink: AcousticSignalSink): void;
}
/** Optional lifecycle for externally supplied model policies (session-owned). */
export interface LifecycleInteractionPolicy extends InteractionPolicy {
    initialize(config: Record<string, unknown>): Promise<void>;
    close(): Promise<void>;
}
export declare function isLifecycleInteractionPolicy(policy: InteractionPolicy): policy is LifecycleInteractionPolicy;
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