import crypto from 'crypto';

/**
 * Generates a cryptographically secure UUID version 4.
 * @returns {string}
 */
export function generateUUIDv4() {
  return crypto.randomUUID();
}

/**
 * Session models an active call coordination session.
 */
export class Session {
  /**
   * @param {string} rideID 
   * @param {string} driverID 
   * @param {string} passengerID 
   * @param {number} durationMs 
   * @param {string} [driverIP]
   * @param {string} [passengerIP]
   */
  constructor(rideID, driverID, passengerID, durationMs, driverIP = null, passengerIP = null) {
    this.sessionID = generateUUIDv4();
    this.rideID = rideID;
    this.driverID = driverID;
    this.passengerID = passengerID;
    this.driverIP = driverIP;
    this.passengerIP = passengerIP;
    this.createdAt = new Date();
    this.expiresAt = new Date(this.createdAt.getTime() + durationMs);
    this.status = 'waiting'; // "waiting" | "active" | "ended"
    this.driverConn = null;
    this.passengerConn = null;
    this.timer = null;
  }
}