'use strict';

// ── Provider contract test ────────────────────────────────────────────────────
// This suite is the "gate" for onboarding new payment providers. It does not
// hardcode "paypal" as the only case — it walks registry.list() and asserts
// every registered provider satisfies the shape payment.service.js relies on.
// Drop a second provider into providers/registry.js and this file validates it
// for free, with zero new test code required.

const registry = require('../../providers/registry');

const REQUIRED_METHODS = ['createOrder', 'captureOrder', 'refundCapture'];

describe('payment provider registry', () => {

  test('lists at least one provider', () => {
    expect(registry.list().length).toBeGreaterThan(0);
  });

  test('currently registers paypal', () => {
    expect(registry.list()).toContain('paypal');
  });

  test('get() returns the provider module for a known name', () => {
    const provider = registry.get('paypal');
    expect(provider).toBeDefined();
  });

  test('get() throws a descriptive error for an unknown provider', () => {
    expect(() => registry.get('stripe')).toThrow(/Unknown payment provider: "stripe"/);
  });

  test('unknown-provider error lists the available providers so misconfiguration is easy to diagnose', () => {
    try {
      registry.get('does-not-exist');
      throw new Error('expected registry.get to throw');
    } catch (err) {
      registry.list().forEach((name) => {
        expect(err.message).toContain(name);
      });
    }
  });

  describe.each(registry.list())('provider contract: %s', (name) => {
    const provider = registry.get(name);

    test.each(REQUIRED_METHODS)('exposes %s as a function', (method) => {
      expect(typeof provider[method]).toBe('function');
    });
  });
});