import { SessionState } from './session';
/**
 * Event types emitted by SessionManager
 */
export type SessionEvent = 'stateChanged' | 'connected' | 'disconnected' | 'reconnecting' | 'connectionQualityChanged' | 'error';
/**
 * Connection quality levels
 */
export type ConnectionQuality = 'excellent' | 'good' | 'poor' | 'unknown';
/**
 * Base event payload
 */
export interface BaseEventPayload {
    /**
     * Session ID
     */
    sessionId: string;
    /**
     * Event timestamp
     */
    timestamp: Date;
}
/**
 * State change event payload
 */
export interface StateChangedPayload extends BaseEventPayload {
    /**
     * Previous state
     */
    previousState: SessionState;
    /**
     * New state
     */
    newState: SessionState;
}
/**
 * Connected event payload
 */
export interface ConnectedPayload extends BaseEventPayload {
    /**
     * Room name
     */
    roomName: string;
    /**
     * Number of participants in room
     */
    participantCount: number;
}
/**
 * Disconnected event payload
 */
export interface DisconnectedPayload extends BaseEventPayload {
    /**
     * Reason for disconnection
     */
    reason?: string;
}
/**
 * Reconnecting event payload
 */
export interface ReconnectingPayload extends BaseEventPayload {
    /**
     * Number of reconnection attempts so far
     */
    attempt: number;
}
/**
 * Connection quality changed event payload
 */
export interface ConnectionQualityChangedPayload extends BaseEventPayload {
    /**
     * Previous quality level
     */
    previousQuality: ConnectionQuality;
    /**
     * New quality level
     */
    newQuality: ConnectionQuality;
}
/**
 * Error event payload
 */
export interface ErrorPayload extends BaseEventPayload {
    /**
     * Error that occurred
     */
    error: Error;
    /**
     * Whether the error is recoverable
     */
    recoverable: boolean;
}
/**
 * Union type of all event payloads
 */
export type EventPayload = StateChangedPayload | ConnectedPayload | DisconnectedPayload | ReconnectingPayload | ConnectionQualityChangedPayload | ErrorPayload;
/**
 * Event handler function type
 */
export type EventHandler<T extends EventPayload = EventPayload> = (payload: T) => void;
/**
 * Event subscription manager interface
 */
export interface EventEmitter {
    /**
     * Subscribe to an event
     */
    on<T extends EventPayload = EventPayload>(event: SessionEvent, handler: EventHandler<T>): () => void;
    /**
     * Unsubscribe from an event
     */
    off<T extends EventPayload = EventPayload>(event: SessionEvent, handler: EventHandler<T>): void;
    /**
     * Emit an event
     */
    emit(event: SessionEvent, payload: EventPayload): void;
}