import { PrismaPg } from '@prisma/adapter-pg';
import { PrismaClient } from '@prisma/client';

import { env } from '@/lib/env';

/**
 * Prisma client singleton.
 *
 * WP-01 wraps this with the tenant-scoping extension required by PLAN.md §3.1,
 * so every query is filtered by the session's account and scope, with
 * PostgreSQL row-level security behind it as defence in depth. Nothing outside
 * this module should construct a client.
 */
const globalForPrisma = globalThis as unknown as {
  prisma: PrismaClient | undefined;
};

function createClient(): PrismaClient {
  const adapter = new PrismaPg({ connectionString: env.DATABASE_URL });

  return new PrismaClient({
    adapter,
    log: env.NODE_ENV === 'development' ? ['warn', 'error'] : ['error'],
  });
}

export const prisma = globalForPrisma.prisma ?? createClient();

if (env.NODE_ENV !== 'production') {
  globalForPrisma.prisma = prisma;
}