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

const globalForPrisma = globalThis as unknown as {
  prisma: PrismaClient | undefined;
};

function createPrismaClient(): PrismaClient {
  const connectionString = process.env.DATABASE_URL;

  if (!connectionString) {
    throw new Error('[DB] DATABASE_URL environment variable is not set!');
  }

  const pool = new Pool({ connectionString });
  const adapter = new PrismaPg(pool);
  return new PrismaClient({ adapter });
}

export const db = globalForPrisma.prisma ?? createPrismaClient();

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