import type { Page } from '@playwright/test';

// Teaching fixture only. No real retailer, secret store, or purchase endpoint.
// Run against the local website preview, e.g. http://127.0.0.1:4333.
export async function prepareDemoCart(page: Page, baseUrl: string) {
  const base = new URL(baseUrl);
  if (base.protocol !== 'http:' || !['127.0.0.1', 'localhost', '[::1]'].includes(base.hostname)) {
    throw new Error('This example only operates on a local mock portal.');
  }
  await page.goto(new URL('/resources/supplier-portal-demo.html', base).href);
  await page.locator("xpath=//*[@id='mock-login']//input[@name='email']")
    .fill('demo@example.invalid');
  await page.getByLabel('Demo passphrase').fill('not-a-secret');
  await page.getByRole('button', { name: 'Sign in to demo', exact: true }).click();
  await page.locator('#demo-catalog').waitFor({ state: 'visible' });

  await page.locator("xpath=//*[@id='mock-search']//input[@name='partNumber']")
    .fill('2756');
  await page.getByRole('button', { name: 'Search demo parts', exact: true }).click();
  const product = page.locator("[data-mpn='BKR6E-11']");
  await product.waitFor({ state: 'visible' });
  if (await product.count() !== 1) throw new Error('Ambiguous part match');
  const available = Number(await product.getAttribute('data-stock'));
  const quantity = 16;
  if (!Number.isSafeInteger(available) || available < quantity) {
    throw new Error('The allocated quantity is not confirmed available');
  }
  await product.getByLabel('Quantity', { exact: true }).fill(String(quantity));
  await page.locator("xpath=//*[@data-mpn='BKR6E-11']//button[@data-action='add-to-cart']")
    .click();
  const cart = page.locator('#demo-cart');
  await cart.waitFor({ state: 'visible' });
  const actualPart = await cart.locator('[data-cart-mpn]').textContent();
  const actualQty = Number(await cart.locator('[data-cart-quantity]').textContent());
  if (actualPart !== 'BKR6E-11' || actualQty !== quantity) {
    throw new Error('Prepared cart does not match the allocation');
  }
  return { exampleOnly: true, manufacturerPart: actualPart, quantity: actualQty,
    unit: 'each', merchandiseCents: actualQty * 320, submitted: false };
}