'use client';

import { useAuth } from '@/lib/auth/AuthContext';

/**
 * Returns the effective driver ID for the current session.
 *
 * Prefers the authenticated user's primaryDriverId when available,
 * otherwise falls back to the demo default used across the alpha site.
 */
export function useEffectiveDriverId(): string {
  const { session } = useAuth();
  const user = session?.user as
    | {
        primaryDriverId?: string | null;
      }
    | undefined;

  // In alpha mode, if the user has no bound driver yet, fall back to the
  // first seeded driver from the in-memory repository instead of a hardcoded ID.
  if (user?.primaryDriverId) {
    return user.primaryDriverId;
  }

  try {
    // Lazy-load to avoid importing DI facade at module evaluation time
    const { getDriverRepository } = require('./di-container') as typeof import('./di-container');
    const repo = getDriverRepository();
    // In-memory repository is synchronous for findAll in the demo implementation
    const allDrivers = repo.findAllSync?.() as Array<{ id: string }> | undefined;
    if (allDrivers && allDrivers.length > 0) {
      return allDrivers[0].id;
    }
  } catch {
    // Ignore and fall back to legacy default below
  }

  // Legacy fallback: preserved only as a last resort for demo
  return '';
}