// The reader end to end: a book goes in (encrypted in the browser), opens, is
// read, and its place, a highlight and the theme survive a reload. The safety
// net for refactoring app.js (docs/refactoring.md). One book for the whole file:
// the tests build on each other and run in order.
const path = require('path');
const { test, expect } = require('@playwright/test');

test.use({ storageState: path.join(__dirname, '.auth', 'user.json') });
test.describe.configure({ mode: 'serial' });

const BOOK = path.join(__dirname, '.auth', 'book.epub');
let bookId = null;

// Errors in the page fail the test that caused them.
let pageErrors = [];
test.beforeEach(({ page }) => {
  pageErrors = [];
  page.on('pageerror', e => pageErrors.push(String(e)));
});
test.afterEach(() => {
  expect(pageErrors, 'errors in the page').toEqual([]);
});

async function openTestBook(page) {
  await page.goto('/#books');
  // A new service worker taking over reloads the page once: let that settle first.
  await page.waitForLoadState('networkidle');
  await page.waitForFunction(() => typeof openBook === 'function' && typeof _lastBookListData !== 'undefined' && Array.isArray(_lastBookListData));
  await page.evaluate(id => openBook(id), bookId);
  await page.waitForFunction(() => document.querySelectorAll('#reader-content [data-epub-src]').length === 12
    && typeof _readPos !== 'undefined' && _readPos && _readPos.ready);
}

async function serverBook(page) {
  const books = await (await page.request.get('/books/')).json();
  return books.find(b => b.id === bookId);
}

test('a book goes in and shows in the list', async ({ page }) => {
  await page.goto('/#books');
  await page.setInputFiles('#book-file-input', BOOK);
  const found = await page.waitForFunction(() => {
    const list = typeof _lastBookListData !== 'undefined' ? (_lastBookListData || []) : [];
    const b = list.find(x => x.title === 'E2E Testbuch');
    return b ? b.id : null;
  }, null, { timeout: 20000 });
  bookId = await found.jsonValue();
  expect(bookId).toBeTruthy();
});

test('opening without reading sends no position', async ({ page }) => {
  const posts = [];
  page.on('request', r => { if (r.method() === 'POST' && /\/progress\/$/.test(r.url())) posts.push(r.url()); });
  await openTestBook(page);
  await page.waitForTimeout(3000);
  await page.evaluate(() => saveReaderProgress());
  await page.evaluate(() => closeReader());
  await page.waitForTimeout(500);
  expect(posts).toEqual([]);
});

test('reading moves the position, and it comes back after a reload', async ({ page }) => {
  await openTestBook(page);
  const content = page.locator('#reader-content');
  await content.hover();
  for (let i = 0; i < 12; i++) await page.mouse.wheel(0, 600);
  const saved = page.waitForRequest(r => r.method() === 'POST' && /\/progress\/$/.test(r.url()));
  const body = JSON.parse((await saved).postData());
  expect(body.device).toBe('Browser');
  expect(body.read_at).toBeGreaterThan(1e12);
  const anchor = await page.evaluate(() => getPositionAnchor(document.getElementById('reader-content')));
  await page.waitForTimeout(500);
  const b = await serverBook(page);
  expect(b.position_anchor).not.toBe('');
  expect(b.device).toBe('Browser');

  await page.reload();
  await openTestBook(page);
  const restored = await page.evaluate(() => getPositionAnchor(document.getElementById('reader-content')));
  const block = a => Number(a.split(':')[0]);
  expect(Math.abs(block(restored) - block(anchor))).toBeLessThanOrEqual(1);
});

test('a footnote shows its text', async ({ page }) => {
  await openTestBook(page);
  const ref = page.locator('#reader-content [data-footnote-ref]').first();
  await ref.scrollIntoViewIfNeeded();
  await ref.click();
  await expect(page.locator('.footnote-popover')).toContainText('Der Text der Fußnote');
});

test('a highlight is kept, and shows in the margin', async ({ page }) => {
  await openTestBook(page);
  // Marker mode on (the ✎ button), select the start of a paragraph on screen
  // the way a mouse would, then let go.
  await page.evaluate(() => {
    if (!markerModeActive) toggleMarkerMode();
    const p = document.querySelector('#reader-content #c1p2') || document.querySelector('#reader-content p');
    p.scrollIntoView({ block: 'center' });
    const text = p.firstChild;
    const range = document.createRange();
    range.setStart(text, 0);
    range.setEnd(text, 20);
    const sel = window.getSelection();
    sel.removeAllRanges();
    sel.addRange(range);
    const r = range.getBoundingClientRect();
    p.dispatchEvent(new MouseEvent('mouseup', { bubbles: true, clientX: r.right, clientY: r.bottom }));
  });
  const saved = page.waitForRequest(r => r.method() === 'POST' && /\/highlights\/$/.test(r.url()), { timeout: 15000 });
  await page.locator('.hl-color-btn[data-hl-color="yellow"]').click();
  await page.evaluate(() => saveHighlights && saveHighlights());
  await saved;

  await page.reload();
  await openTestBook(page);
  await page.waitForFunction(() => document.querySelectorAll('#reader-content mark.epub-highlight, #reader-content .epub-highlight').length > 0);
  // The margin remembers being open; open it if it isn't.
  await page.evaluate(() => { if (!readerAnnotationsMarginOpen) toggleAnnotationsMargin(); });
  await expect(page.locator('#reader-margin-markers .margin-note')).toHaveCount(1);
});

test('the theme switch turns the page and the reader light, and stays', async ({ page }) => {
  await page.goto('/');
  await expect(page.locator('html')).toHaveAttribute('data-theme', 'dark');
  await page.locator('#theme-toggle').click();
  await expect(page.locator('html')).toHaveAttribute('data-theme', 'light');
  await page.reload();
  await expect(page.locator('html')).toHaveAttribute('data-theme', 'light');
  await openTestBook(page);
  await expect(page.locator('#reader-overlay')).toHaveClass(/reader-theme-bright/);
  await page.evaluate(() => { closeReader(); __dioraSetTheme('dark'); });
  await expect(page.locator('html')).toHaveAttribute('data-theme', 'dark');
});

test('every tab opens without errors', async ({ page }) => {
  await page.goto('/');
  for (const tab of ['home', 'radio', 'podcasts', 'books', 'feeds', 'focus', 'ambient']) {
    await page.evaluate(t => showTab(t), tab);
    await expect(page.locator(`#tab-${tab}`)).toBeVisible();
  }
});