import { test, expect, Page } from '@playwright/test';

/**
 * Journey tests for SchoolCompare, run against the staging environment as the
 * gate before promotion to production. They assert stable data invariants
 * (results exist, key UI renders) rather than exact numbers, so routine data
 * refreshes don't break the pipeline.
 */

async function searchByName(page: Page, query: string) {
  await page.goto('/');
  const searchInput = page.getByPlaceholder('School name or postcode').first();
  await searchInput.fill(query);
  await searchInput.press('Enter');
  await page.waitForURL(/search=|postcode=/);
}

function schoolLinks(page: Page) {
  return page.locator('a[href^="/school/"]');
}

test('home page loads with hero search', async ({ page }) => {
  await page.goto('/');
  await expect(page.locator('h1').first()).toBeVisible();
  await expect(page.getByPlaceholder('School name or postcode').first()).toBeVisible();
});

test('searching by name returns school results', async ({ page }) => {
  await searchByName(page, 'primary');
  await expect(schoolLinks(page).first()).toBeVisible({ timeout: 15_000 });
  expect(await schoolLinks(page).count()).toBeGreaterThan(1);
});

test('searching by postcode returns nearby schools', async ({ page }) => {
  await searchByName(page, 'B1 1BB');
  await expect(schoolLinks(page).first()).toBeVisible({ timeout: 15_000 });
});

test('school detail page renders name and performance data', async ({ page }) => {
  await searchByName(page, 'primary');
  const firstSchool = schoolLinks(page).first();
  await expect(firstSchool).toBeVisible({ timeout: 15_000 });
  await firstSchool.click();
  await page.waitForURL(/\/school\//);
  await expect(page.locator('h1').first()).toBeVisible();
  // The detail page renders at least one chart canvas (performance history).
  // Charts live below the fold and only become visible once scrolled to, so
  // wait for the element, scroll it into view, then assert visibility.
  const chart = page.locator('canvas').first();
  await chart.waitFor({ state: 'attached', timeout: 15_000 });
  await chart.scrollIntoViewIfNeeded();
  await expect(chart).toBeVisible({ timeout: 15_000 });
});

test('comparing two schools shows both side by side', async ({ page }) => {
  // Collect two school URNs from search results, then load the share URL
  await searchByName(page, 'primary');
  await expect(schoolLinks(page).first()).toBeVisible({ timeout: 15_000 });
  const hrefs = await schoolLinks(page).evaluateAll((links) =>
    links.map((l) => (l as HTMLAnchorElement).getAttribute('href') || '')
  );
  const urns = [...new Set(hrefs.map((h) => h.match(/\/school\/(\d+)/)?.[1]).filter(Boolean))];
  expect(urns.length).toBeGreaterThanOrEqual(2);

  await page.goto(`/compare?urns=${urns[0]},${urns[1]}`);
  // Both schools' detail links should render in the comparison view
  await expect(page.locator(`a[href*="${urns[0]}"]`).first()).toBeVisible({ timeout: 15_000 });
  await expect(page.locator(`a[href*="${urns[1]}"]`).first()).toBeVisible();
});

test('rankings page loads a populated table', async ({ page }) => {
  await page.goto('/rankings');
  await expect(page.getByRole('heading', { name: /rankings/i }).first()).toBeVisible();
  const rows = page.locator('table tbody tr');
  await expect(rows.first()).toBeVisible({ timeout: 15_000 });
  expect(await rows.count()).toBeGreaterThan(5);
});