import { Client } from 'pg';
import { dbSessionConfig } from '../src/prisma/db-session';
import { PrismaService } from '../src/prisma/prisma.service';

/**
 * Prisma fills @default(now()) on the client as UTC wall clock, SQL now()
 * stores the session's wall clock - both in `timestamp without time zone`
 * columns. They only agree if every session runs in UTC, whatever the
 * server or database default is (the local test DB runs Europe/Berlin).
 */
describe('Database session time zone (e2e)', () => {
  let prisma: PrismaService;
  const aggregateId = `tz-${Date.now()}-${Math.round(Math.random() * 1e6)}`;

  beforeAll(() => {
    prisma = new PrismaService();
  });

  afterAll(async () => {
    await prisma.domainEvent.deleteMany({ where: { aggregateId } });
    await prisma.$disconnect();
  });

  it('runs a fresh Prisma connection in UTC', async () => {
    const [{ TimeZone }] = await prisma.$queryRaw<
      { TimeZone: string }[]
    >`SHOW TIME ZONE`;

    expect(TimeZone).toBe('UTC');
  });

  it('writes a Prisma default timestamp and SQL now() on the same clock', async () => {
    const seconds = await prisma.$transaction(async (tx) => {
      const event = await tx.domainEvent.create({
        data: {
          type: 'TaskDue',
          aggregateType: 'Task',
          aggregateId,
          payload: { dueOn: '2026-10-13' },
          correlationId: aggregateId,
        },
      });
      const [{ s }] = await tx.$queryRaw<
        { s: number }[]
      >`SELECT EXTRACT(EPOCH FROM now() - "occurredAt")::float AS s FROM "DomainEvent" WHERE "id" = ${event.id}`;
      return s;
    });

    expect(Math.abs(seconds)).toBeLessThan(1);
  });

  it('runs a raw pg connection with the shared session options in UTC (LISTEN client)', async () => {
    const client = new Client(dbSessionConfig(process.env.DATABASE_URL));
    await client.connect();
    try {
      const { rows } = await client.query<{ TimeZone: string }>(
        'SHOW TIME ZONE',
      );
      expect(rows[0].TimeZone).toBe('UTC');
    } finally {
      await client.end();
    }
  });
});