import { PrismaClient } from '@prisma/client'

const prismaClientSingleton = () => {
  return new PrismaClient({
    datasources: {
      db: {
        url: process.env.DATABASE_URL || 'postgresql://memento:memento@localhost:5432/memento',
      },
    },
  })
}

/** Dev hot-reload can keep an old PrismaClient missing newly generated models. */
function needsFreshPrismaClient(client: PrismaClient | undefined): boolean {
  if (!client) return true
  return typeof (client as PrismaClient & { flashcard?: unknown }).flashcard === 'undefined'
}

declare const globalThis: {
  prismaGlobal: ReturnType<typeof prismaClientSingleton>;
} & typeof global;

let prisma = globalThis.prismaGlobal ?? prismaClientSingleton()

if (process.env.NODE_ENV !== 'production') {
  if (needsFreshPrismaClient(globalThis.prismaGlobal)) {
    prisma = prismaClientSingleton()
  }
  globalThis.prismaGlobal = prisma

  const models = Object.keys(prisma).filter(k => !k.startsWith('_') && !k.startsWith('$'))
  console.log('[Prisma] Models loaded:', models.join(', '))
}

export { prisma }
export default prisma