/**
 * The generated migration is schema-qualified to "payload" throughout but does
 * not create that schema — `schemaName` says where tables go, it does not
 * create anything. On staging and production, which have never run it, the
 * whole migration fails with `schema "payload" does not exist`.
 *
 * The CREATE SCHEMA is therefore hand-added, which makes it exactly the kind
 * of edit a regeneration silently discards. This is the guard.
 */
import fs from 'fs';
import path from 'path';

const DIR = path.join(__dirname, '..', '..', 'migrations');

function migrationFiles() {
  return fs
    .readdirSync(DIR)
    .filter((f) => f.endsWith('.ts') && f !== 'index.ts');
}

describe('payload migrations', () => {
  it('ships at least one migration, so a container has tables to find', () => {
    expect(migrationFiles().length).toBeGreaterThan(0);
  });

  it('creates the payload schema before creating anything in it', () => {
    const initial = migrationFiles().find((f) => f.includes('initial'))!;
    const sql = fs.readFileSync(path.join(DIR, initial), 'utf8');

    expect(sql).toMatch(/CREATE SCHEMA IF NOT EXISTS "payload"/);

    // Ordering matters: the schema must be created before the first object
    // that lives in it, or the migration fails on its first statement.
    expect(sql.indexOf('CREATE SCHEMA IF NOT EXISTS "payload"'))
      .toBeLessThan(sql.indexOf('CREATE TABLE "payload"'));
  });

  it('creates the tables the app queries on boot', () => {
    const initial = migrationFiles().find((f) => f.includes('initial'))!;
    const sql = fs.readFileSync(path.join(DIR, initial), 'utf8');
    for (const table of ['users', 'posts', '_posts_v', 'media', 'payload_migrations']) {
      expect(sql).toContain(`CREATE TABLE "payload"."${table}"`);
    }
  });

  it('is wired into the adapter, so it runs on server init', () => {
    const config = fs.readFileSync(
      path.join(__dirname, '..', '..', 'payload.config.ts'), 'utf8',
    );
    expect(config).toMatch(/prodMigrations:\s*migrations/);
  });
});