import { Client } from 'pg';

/**
 * Direct database access for the tests, for the one thing the API deliberately
 * will not give them.
 *
 * The password-reset token is only ever delivered by email, which these tests
 * cannot read. It is read from the database rather than through a helper
 * endpoint because an endpoint that returns a reset token for an arbitrary
 * address is account takeover for every customer if it is ever reachable, and
 * an environment gate is a thin thing to stand between that and production.
 * Doing it here keeps the capability entirely inside the test process.
 *
 * That reasoning is unchanged from when it lived inline in
 * password-reset.spec.ts. What has changed is that it is no longer sitting in a
 * spec where it can be copied into the next one that wants a shortcut.
 */

/**
 * The default port is 55500, matching scripts/start-local.ps1.
 *
 * It used to be 55432, which is the integration suite's disposable Postgres —
 * a different database, with different credentials, that the app under test is
 * not connected to. Worse, 55432 is reserved by Hyper-V on at least one machine
 * here, so the spec failed with a bare ECONNREFUSED naming a port nobody had
 * chosen. TEST_PGPORT still overrides, for CI and for anyone running the stack
 * somewhere else.
 */
function connectionSettings() {
  return {
    host: process.env.TEST_PGHOST || 'localhost',
    port: parseInt(process.env.TEST_PGPORT || '55500', 10),
    user: process.env.TEST_PGUSER || 'redefined_local',
    password: process.env.TEST_PGPASSWORD || 'redefined_local',
    database: process.env.TEST_PGDATABASE || 'redefined_local'
  };
}

/** Opens a connection, runs the query, and closes it whatever happens. */
async function withClient<T>(run: (client: Client) => Promise<T>): Promise<T> {
  const client = new Client(connectionSettings());
  await client.connect();
  try {
    return await run(client);
  } finally {
    await client.end();
  }
}

/**
 * The most recent password-reset token issued to an address.
 *
 * Throws rather than returning null: every caller is about to build a URL from
 * it, and a missing token means the request under test did not do what it said,
 * which is worth failing loudly at the point it happened.
 */
export async function readPasswordResetToken(email: string): Promise<string> {
  return withClient(async (client) => {
    const { rows } = await client.query(
      `SELECT t.token FROM customer_tokens t
       JOIN customers c ON c.id = t.customer_id
       WHERE c.email = $1 AND t.kind = 'password_reset'
       ORDER BY t.created_at DESC LIMIT 1`,
      [email]
    );
    if (!rows.length) throw new Error(`no password_reset token issued for ${email}`);
    return rows[0].token as string;
  });
}