// @ts-check
/**
 * Demo interaction tests — verify every demo actually functions.
 *
 * Each test loads a demo, interacts with it (click buttons, type in inputs),
 * and verifies the DOM changes as expected. Also checks no raw SX class text
 * leaks into the visible DOM.
 */
const { test, expect } = require('playwright/test');
const BASE_URL = process.env.SX_TEST_URL || 'http://localhost:8013';

// Helper: assert no raw class text leaked
async function assertNoClassLeak(page, scope) {
  const loc = scope ? page.locator(scope).first() : page.locator('#sx-root');
  const text = await loc.textContent();
  expect(text).not.toContain('classpx');
  expect(text).not.toContain('classborder');
  expect(text).not.toContain('classbg-');
}

// Helper: get island locator
function island(page, pattern) {
  return page.locator(`[data-sx-island*="${pattern}"]`);
}


// ===========================================================================
// Reactive island demos
// ===========================================================================

test.describe('Reactive island interactions', () => {

  test('counter: + and − change count and doubled', async ({ page }) => {
    await page.goto(BASE_URL + '/sx/(geography.(reactive.(examples.counter)))', { waitUntil: 'networkidle' });
    await page.waitForTimeout(2000);

    const el = island(page, 'counter');
    await expect(el).toBeVisible({ timeout: 10000 });

    const buttons = el.locator('button');
    await expect(buttons).toHaveCount(2);

    // Click + 3 times
    const plus = buttons.last();
    await plus.click(); await plus.click(); await plus.click();
    await page.waitForTimeout(300);

    const text = await el.textContent();
    expect(text).toContain('3');
    expect(text).toContain('doubled');
    expect(text).toContain('6');

    // Click − once
    await buttons.first().click();
    await page.waitForTimeout(300);
    const text2 = await el.textContent();
    expect(text2).toContain('2');
  });

  test('temperature: +/− change celsius and fahrenheit', async ({ page }) => {
    await page.goto(BASE_URL + '/sx/(geography.(reactive.(examples.temperature)))', { waitUntil: 'networkidle' });
    await page.waitForTimeout(2000);

    const el = island(page, 'temperature');
    await expect(el).toBeVisible({ timeout: 10000 });

    const buttons = el.locator('button');
    // Click + a few times
    await buttons.last().click();
    await buttons.last().click();
    await page.waitForTimeout(300);

    const text = await el.textContent();
    // Should show °C and °F
    expect(text).toContain('°C');
    expect(text).toContain('°F');
  });

  test('stopwatch: start shows elapsed time', async ({ page }) => {
    await page.goto(BASE_URL + '/sx/(geography.(reactive.(examples.stopwatch)))', { waitUntil: 'networkidle' });
    await page.waitForTimeout(2000);

    const el = island(page, 'stopwatch');
    await expect(el).toBeVisible({ timeout: 10000 });

    const textBefore = await el.textContent();
    // Click start (first button)
    await el.locator('button').first().click();
    await page.waitForTimeout(1500);
    const textAfter = await el.textContent();
    expect(textAfter).not.toBe(textBefore);
  });

  test('input-binding: typing updates live preview', async ({ page }) => {
    await page.goto(BASE_URL + '/sx/(geography.(reactive.(examples.input-binding)))', { waitUntil: 'networkidle' });
    await page.waitForTimeout(2000);

    const el = island(page, 'input-binding');
    await expect(el).toBeVisible({ timeout: 10000 });

    const input = el.locator('input').first();
    await input.fill('playwright test');
    await page.waitForTimeout(300);

    const text = await el.textContent();
    expect(text).toContain('playwright test');
  });

  test('dynamic-class: toggle changes element styling', async ({ page }) => {
    await page.goto(BASE_URL + '/sx/(geography.(reactive.(examples.dynamic-class)))', { waitUntil: 'networkidle' });
    await page.waitForTimeout(2000);

    const el = island(page, 'dynamic-class');
    await expect(el).toBeVisible({ timeout: 10000 });

    const htmlBefore = await el.innerHTML();
    await el.locator('button').first().click();
    await page.waitForTimeout(300);
    const htmlAfter = await el.innerHTML();
    expect(htmlAfter).not.toBe(htmlBefore);
  });

  test('reactive-list: add button increases items', async ({ page }) => {
    await page.goto(BASE_URL + '/sx/(geography.(reactive.(examples.reactive-list)))', { waitUntil: 'networkidle' });
    await page.waitForTimeout(2000);

    const el = island(page, 'reactive-list');
    await expect(el).toBeVisible({ timeout: 10000 });

    const textBefore = await el.textContent();
    // Click add button
    await el.locator('button').first().click();
    await page.waitForTimeout(300);
    const textAfter = await el.textContent();
    expect(textAfter).not.toBe(textBefore);
  });

  test('stores: writer and reader both render and share state', async ({ page }) => {
    await page.goto(BASE_URL + '/sx/(geography.(reactive.(examples.stores)))', { waitUntil: 'networkidle' });
    await page.waitForTimeout(2000);

    const writer = island(page, 'store-writer');
    const reader = island(page, 'store-reader');
    await expect(writer).toBeVisible({ timeout: 10000 });
    await expect(reader).toBeVisible({ timeout: 10000 });

    // Both islands should have content
    expect((await writer.textContent()).length).toBeGreaterThan(0);
    expect((await reader.textContent()).length).toBeGreaterThan(0);

    // Interact with writer — try button then input
    const btn = writer.locator('button').first();
    const input = writer.locator('input').first();
    if (await btn.count() > 0) {
      await btn.click();
      await page.waitForTimeout(500);
    } else if (await input.count() > 0) {
      const type = await input.getAttribute('type');
      if (type === 'checkbox') {
        await input.check();
      } else {
        await input.fill('test');
      }
      await page.waitForTimeout(500);
    }
    // Islands should still be visible and functional
    await expect(writer).toBeVisible();
    await expect(reader).toBeVisible();
  });

  test('refs: focus button focuses input', async ({ page }) => {
    await page.goto(BASE_URL + '/sx/(geography.(reactive.(examples.refs)))', { waitUntil: 'networkidle' });
    await page.waitForTimeout(2000);

    const el = island(page, 'refs');
    await expect(el).toBeVisible({ timeout: 10000 });

    // Click a button — should interact with the input
    const textBefore = await el.textContent();
    await el.locator('button').first().click();
    await page.waitForTimeout(500);
    // Verify something changed or input is focused
    const focused = await page.evaluate(() => document.activeElement?.tagName);
    // Accept either text change or input focus
    const textAfter = await el.textContent();
    expect(textAfter !== textBefore || focused === 'INPUT').toBeTruthy();
  });

  test('portal: button toggles portal content', async ({ page }) => {
    await page.goto(BASE_URL + '/sx/(geography.(reactive.(examples.portal)))', { waitUntil: 'networkidle' });
    await page.waitForTimeout(2000);

    const el = island(page, 'portal');
    await expect(el).toBeVisible({ timeout: 10000 });

    const htmlBefore = await page.locator('#sx-root').innerHTML();
    await el.locator('button').first().click();
    await page.waitForTimeout(500);
    const htmlAfter = await page.locator('#sx-root').innerHTML();
    expect(htmlAfter).not.toBe(htmlBefore);
  });

  test('imperative: button triggers DOM manipulation', async ({ page }) => {
    await page.goto(BASE_URL + '/sx/(geography.(reactive.(examples.imperative)))', { waitUntil: 'networkidle' });
    await page.waitForTimeout(2000);

    const el = island(page, 'imperative');
    await expect(el).toBeVisible({ timeout: 10000 });

    const textBefore = await el.textContent();
    await el.locator('button').first().click();
    await page.waitForTimeout(500);
    const textAfter = await el.textContent();
    expect(textAfter).not.toBe(textBefore);
  });

  test('error-boundary: trigger error shows boundary message', async ({ page }) => {
    await page.goto(BASE_URL + '/sx/(geography.(reactive.(examples.error-boundary)))', { waitUntil: 'networkidle' });
    await page.waitForTimeout(2000);

    const el = island(page, 'error-boundary');
    await expect(el).toBeVisible({ timeout: 10000 });

    // Click trigger error button
    const triggerBtn = el.locator('button').filter({ hasText: /error|trigger|throw/i }).first();
    if (await triggerBtn.count() > 0) {
      await triggerBtn.click();
      await page.waitForTimeout(500);
      const text = await el.textContent();
      // Should show error message, not crash
      expect(text.toLowerCase()).toMatch(/error|caught|boundary/);
    }
  });

  test('event-bridge: sender triggers receiver update', async ({ page }) => {
    await page.goto(BASE_URL + '/sx/(geography.(reactive.(examples.event-bridge-demo)))', { waitUntil: 'networkidle' });
    await page.waitForTimeout(2000);

    const el = island(page, 'event-bridge');
    await expect(el).toBeVisible({ timeout: 10000 });

    const textBefore = await el.textContent();
    await el.locator('button').first().click();
    await page.waitForTimeout(500);
    const textAfter = await el.textContent();
    expect(textAfter).not.toBe(textBefore);
  });

  test('transition: island renders and toggle works', async ({ page }) => {
    await page.goto(BASE_URL + '/sx/(geography.(reactive.(examples.transition)))', { waitUntil: 'networkidle' });
    await page.waitForTimeout(2000);

    const el = island(page, 'transition');
    await expect(el).toBeVisible({ timeout: 10000 });

    // Island should have content
    const text = await el.textContent();
    expect(text.length).toBeGreaterThan(0);

    // Find any button/input in the island
    const btn = el.locator('button, input[type="checkbox"]').first();
    if (await btn.count() > 0) {
      const htmlBefore = await el.innerHTML();
      await btn.click();
      await page.waitForTimeout(1500);
      // After animation, island should still be functional
      await expect(el).toBeVisible();
    }
  });

  test('resource: shows loading then data', async ({ page }) => {
    await page.goto(BASE_URL + '/sx/(geography.(reactive.(examples.resource)))', { waitUntil: 'networkidle' });
    await page.waitForTimeout(2000);

    const el = island(page, 'resource');
    await expect(el).toBeVisible({ timeout: 10000 });

    // Should show loading or resolved data
    const text = await el.textContent();
    expect(text.length).toBeGreaterThan(0);
    // Wait for resource to resolve
    await page.waitForTimeout(3000);
    const text2 = await el.textContent();
    // Should show the resolved name
    expect(text2).toContain('Ada');
  });
});


// ===========================================================================
// Marshes demos — where reactivity meets hypermedia
// ===========================================================================

test.describe('Marshes interactions', () => {

  test('hypermedia-feeds: reactive +/− and server fetch both work', async ({ page }) => {
    await page.goto(BASE_URL + '/sx/(geography.(marshes.hypermedia-feeds))', { waitUntil: 'networkidle' });
    await page.waitForTimeout(2000);

    const el = island(page, 'marsh-product');
    await expect(el).toBeVisible({ timeout: 10000 });

    // Click + button (reactive signal) — should change quantity/price
    const plusBtn = el.locator('button:has-text("+")').first();
    if (await plusBtn.count() > 0) {
      const textBefore = await el.textContent();
      await plusBtn.click();
      await page.waitForTimeout(300);
      const textAfter = await el.textContent();
      expect(textAfter).not.toBe(textBefore);
    }

    // Click server fetch button — should update server message
    const fetchBtn = page.locator('button:has-text("Fetch")').first();
    if (await fetchBtn.count() > 0) {
      await fetchBtn.click();
      await page.waitForTimeout(3000);
    }

    await assertNoClassLeak(page, '[data-sx-island*="marsh-product"]');
  });

  test('on-settle: sx-on-settle evaluates after swap', async ({ page }) => {
    await page.goto(BASE_URL + '/sx/(geography.(marshes.on-settle))', { waitUntil: 'networkidle' });
    await page.waitForTimeout(2000);

    const el = island(page, 'marsh-settle');
    await expect(el).toBeVisible({ timeout: 10000 });

    const textBefore = await el.textContent();
    const btn = el.locator('button').first();
    if (await btn.count() > 0) {
      await btn.click();
      await page.waitForTimeout(3000);
      const textAfter = await el.textContent();
      expect(textAfter).not.toBe(textBefore);
    }
    await assertNoClassLeak(page, '[data-sx-island*="marsh-settle"]');
  });

  test('server-signals: server fetch writes to client signal', async ({ page }) => {
    await page.goto(BASE_URL + '/sx/(geography.(marshes.server-signals))', { waitUntil: 'networkidle' });
    await page.waitForTimeout(2000);

    const writer = island(page, 'marsh-store-writer');
    const reader = island(page, 'marsh-store-reader');
    await expect(writer).toBeVisible({ timeout: 10000 });
    await expect(reader).toBeVisible({ timeout: 10000 });

    // Click the server fetch button (sx-get/sx-post, not reactive +/−)
    const fetchBtn = writer.locator('button[sx-get], button[sx-post], button:has-text("Fetch"), button:has-text("Load")').first();
    if (await fetchBtn.count() > 0) {
      const readerBefore = await reader.textContent();
      await fetchBtn.click();
      await page.waitForTimeout(3000);
      const readerAfter = await reader.textContent();
      expect(readerAfter).not.toBe(readerBefore);
    } else {
      // Fall back: click + button in writer
      const plus = writer.locator('button:has-text("+")').first();
      if (await plus.count() > 0) {
        const before = await writer.textContent();
        await plus.click();
        await page.waitForTimeout(300);
        expect(await writer.textContent()).not.toBe(before);
      }
    }
    await assertNoClassLeak(page, '[data-sx-island*="marsh-store"]');
  });

  test('signal-triggers: button changes signal, triggers fetch', async ({ page }) => {
    await page.goto(BASE_URL + '/sx/(geography.(marshes.signal-triggers))', { waitUntil: 'networkidle' });
    await page.waitForTimeout(2000);

    const el = island(page, 'marsh-signal-url');
    await expect(el).toBeVisible({ timeout: 10000 });

    // Click buttons to change the signal — may trigger a server fetch
    const buttons = el.locator('button');
    if (await buttons.count() >= 2) {
      const textBefore = await el.textContent();
      await buttons.nth(1).click(); // try second button (different from current state)
      await page.waitForTimeout(3000);
      const textAfter = await el.textContent();
      // Accept either text change or same (if button is current state)
    }
    // Island should render properly
    await expect(el).toBeVisible();
  });

  test('view-transform: view toggle changes rendering', async ({ page }) => {
    await page.goto(BASE_URL + '/sx/(geography.(marshes.view-transform))', { waitUntil: 'networkidle' });
    await page.waitForTimeout(2000);

    const el = island(page, 'marsh-view-transform');
    await expect(el).toBeVisible({ timeout: 10000 });

    // Click "Fetch Catalog" to load data, then toggle view
    const fetchBtn = page.locator('button:has-text("Fetch"), button[sx-get]').first();
    if (await fetchBtn.count() > 0) {
      await fetchBtn.click();
      await page.waitForTimeout(3000);
    }

    // Toggle view buttons
    const viewBtns = el.locator('button');
    if (await viewBtns.count() >= 2) {
      const htmlBefore = await el.innerHTML();
      await viewBtns.nth(1).click();
      await page.waitForTimeout(500);
      const htmlAfter = await el.innerHTML();
      expect(htmlAfter).not.toBe(htmlBefore);
    }
  });
});


// ===========================================================================
// JIT health check — no DISABLED or SSR failures after warmup
// ===========================================================================

test.describe('Server health', () => {

  test('no JS errors on reactive demo pages', async ({ page }) => {
    const errors = [];
    page.on('pageerror', err => errors.push(err.message));

    const demos = ['counter', 'temperature', 'stopwatch', 'input-binding',
      'dynamic-class', 'reactive-list', 'stores', 'resource'];

    for (const demo of demos) {
      await page.goto(BASE_URL + `/sx/(geography.(reactive.(examples.${demo})))`, { waitUntil: 'networkidle' });
      await page.waitForTimeout(1000);
    }

    const real = errors.filter(e => !e.includes('net::ERR') && !e.includes('fetch'));
    expect(real).toEqual([]);
  });

  test('no JS errors on marshes pages', async ({ page }) => {
    const errors = [];
    page.on('pageerror', err => errors.push(err.message));

    const pages = ['hypermedia-feeds', 'on-settle', 'server-signals',
      'signal-triggers', 'view-transform'];

    for (const p of pages) {
      await page.goto(BASE_URL + `/sx/(geography.(marshes.${p}))`, { waitUntil: 'networkidle' });
      await page.waitForTimeout(1000);
    }

    const real = errors.filter(e => !e.includes('net::ERR') && !e.includes('fetch'));
    expect(real).toEqual([]);
  });
});