import { Injectable, OnApplicationShutdown, OnModuleInit } from '@nestjs/common';
import { PrismaClient } from './generated/client';
import { PrismaPg } from '@prisma/adapter-pg';

/** Prisma client shared by the whole app (global PrismaModule), connected to `DATABASE_URL` through the pg driver adapter. */
@Injectable()
export class PrismaService extends PrismaClient implements OnModuleInit, OnApplicationShutdown {
  constructor() {
    const adapter = new PrismaPg({ connectionString: process.env.DATABASE_URL });
    // 'minimal': by default, error messages print the query arguments (emails, names, addresses...), which end up in the logs
    super({ adapter, errorFormat: 'minimal' });
  }

  async onModuleInit() {
    await this.$connect();
  }

  /**
   * Last shutdown hook (after `onModuleDestroy` and `beforeApplicationShutdown`, once the HTTP server is closed):
   * a synchronization still running is waited for in `beforeApplicationShutdown` and keeps the database until then.
   */
  async onApplicationShutdown() {
    await this.$disconnect();
  }
}