import type { CallDirection, CallEndReason, CallEvent, CallMetadata } from "../ExpoVicallCallManager.types";
/**
 * High-level call phase for host apps that own their own in-call UI
 * (X / social-network style: system UI for ring/lock screen, app UI for the
 * ongoing call canvas).
 */
export type CallLifecyclePhase = "idle" | "ringing" | "dialing" | "connecting" | "active" | "held" | "ended";
/**
 * Synthetic lifecycle inputs that are not native CallEvents.
 * Hosts emit `callBecameActive` after media is joined and `setCallActive` succeeds.
 */
export type CallLifecycleInput = CallEvent | {
    type: "callBecameActive";
    callId: string;
} | {
    type: "reset";
};
export interface CallLifecycleState {
    phase: CallLifecyclePhase;
    activeCallId: string | null;
    direction: CallDirection | null;
    displayName: string | null;
    handle: string | null;
    hasVideo: boolean;
    muted: boolean;
    held: boolean;
    metadata: CallMetadata;
    endReason: CallEndReason | string | null;
    /**
     * When true, the host app should mount its own audio/video call screen.
     * System incoming UI is owned by CallKit / Telecom, not by this flag.
     */
    shouldPresentAppCallUi: boolean;
    lastEventType: string | null;
    lastEventAt: number | null;
}
export declare function createInitialCallLifecycleState(): CallLifecycleState;
/**
 * Pure reducer that turns system call events into UI-driving lifecycle state.
 * The module never renders screens; hosts use this to open/close their own UI.
 */
export declare function reduceCallLifecycle(state: CallLifecycleState, input: CallLifecycleInput): CallLifecycleState;
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