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

export type Db = PrismaClient;
/** Transaktions-Client innerhalb von db.$transaction(async (tx) => …). */
export type Tx = Parameters<Parameters<PrismaClient["$transaction"]>[0]>[0];

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

function createClient(): PrismaClient {
  const connectionString = process.env.DATABASE_URL;
  if (!connectionString) throw new Error("DATABASE_URL ist nicht gesetzt.");
  const adapter = new PrismaPg({ connectionString, max: Number(process.env.DATABASE_POOL_SIZE ?? 10) });
  return new PrismaClient({ adapter, log: ["error"] });
}

/** Lazy, damit der Build (ohne Datenbank) Module importieren kann. */
export function getDb(): PrismaClient {
  if (!globalForPrisma.prisma) globalForPrisma.prisma = createClient();
  return globalForPrisma.prisma;
}

export const CAMP_ID = "modelcamp-2027";