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

// Singleton pattern for Prisma client - prevents "Too many database connections" error
const globalForPrisma = globalThis as unknown as {
  prisma: PrismaClient | undefined;
};

function createPrismaClient() {
  const adapter = new PrismaPg({ connectionString: process.env.DATABASE_URL });
  
  return new PrismaClient({
    adapter,
    log: process.env.NODE_ENV === 'dev' ? ['query', 'info', 'warn', 'error'] : ['error'],
  });
}

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

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

// For serverless environments, always cache the client
if (process.env.IS_OFFLINE || process.env.AWS_LAMBDA_FUNCTION_NAME) {
  globalForPrisma.prisma = prisma;
}