import { readFile } from 'node:fs/promises';
import { join } from 'node:path';

describe('billing customer foundation correction migration', () => {
  let migrationSql: string;

  beforeAll(async () => {
    migrationSql = await readFile(
      join(
        process.cwd(),
        'prisma/migrations/20260708130000_milestone121_checkout_customer_foundation_correction/migration.sql',
      ),
      'utf8',
    );
  });

  it('creates the billing_customers table', () => {
    expect(migrationSql).toContain(`CREATE TABLE "billing_customers"`);
  });

  it('enforces one billing customer per user and unique provider customer ids', () => {
    expect(migrationSql).toContain(
      `CREATE UNIQUE INDEX "billing_customers_user_id_key"`,
    );
    expect(migrationSql).toContain(
      `CREATE UNIQUE INDEX "billing_customers_provider_customer_id_key"`,
    );
  });

  it('relates billing customers to users with cascading deletes', () => {
    expect(migrationSql).toContain(
      `ADD CONSTRAINT "billing_customers_user_id_fkey"`,
    );
    expect(migrationSql).toContain(`REFERENCES "users"("id")`);
    expect(migrationSql).toContain(`ON DELETE CASCADE`);
    expect(migrationSql).toContain(`ON UPDATE CASCADE`);
  });

  it('removes provider customer identity from user_subscriptions', () => {
    expect(migrationSql).toContain(
      `DROP INDEX "user_subscriptions_provider_customer_id_key";`,
    );
    expect(migrationSql).toContain(
      `DROP COLUMN "provider_customer_id";`,
    );
  });
});