import { createTopBar } from '../components/topbar.js';
import { saveEntryLanguage, state } from '../state.js';

export const pageMeta = { id: 'language-view', title: 'Язык' };

function resolveReturnPage() {
  const stored = String(sessionStorage.getItem('shine-language-return-page') || '').trim();
  return stored === 'start-view' ? 'start-view' : 'settings-view';
}

export function render({navigate, chrome}) {
  const screen = document.createElement('section');
  screen.className = 'stack language-screen';
  const returnPage = resolveReturnPage();
  let pendingLanguage = state.entrySettings.language === 'en' ? 'en' : 'ru';

  chrome?.setTopbar(createTopBar({
      title: 'Язык / Language',
      back: { label: '←', onClick: () => {
        sessionStorage.removeItem('shine-language-return-page');
        navigate(returnPage);
      } },
    }));

  const card = document.createElement('div');
  card.className = 'card stack language-choice-card';
  card.innerHTML = `
    <p class="meta-muted language-choice-hint">Выберите язык интерфейса</p>
    <div class="language-segmented-control" role="radiogroup" aria-label="Язык интерфейса">
      <button class="language-segment${pendingLanguage === 'ru' ? ' is-selected' : ''}" type="button" data-language="ru" role="radio" aria-checked="${pendingLanguage === 'ru'}">Русский</button>
      <button class="language-segment${pendingLanguage === 'en' ? ' is-selected' : ''}" type="button" data-language="en" role="radio" aria-checked="${pendingLanguage === 'en'}">English</button>
      <span class="language-segmented-thumb" aria-hidden="true"></span>
    </div>
    <div class="language-choice-actions">
      <button class="shine-btn shine-btn--settings" type="button" data-action="cancel">Отмена</button>
      <button class="shine-btn shine-btn--primary" type="button" data-action="ok">OK</button>
    </div>
  `;

  const syncSelection = () => {
    card.dataset.language = pendingLanguage;
    card.querySelectorAll('[data-language]').forEach((item) => {
      const selected = item.dataset.language === pendingLanguage;
      item.classList.toggle('is-selected', selected);
      item.setAttribute('aria-checked', String(selected));
    });
  };
  syncSelection();

  card.querySelectorAll('[data-language]').forEach((button) => {
    button.addEventListener('click', () => {
      pendingLanguage = button.dataset.language === 'en' ? 'en' : 'ru';
      syncSelection();
    });
  });
  card.querySelector('[data-action="cancel"]')?.addEventListener('click', () => {
    sessionStorage.removeItem('shine-language-return-page');
    navigate(returnPage);
  });
  card.querySelector('[data-action="ok"]')?.addEventListener('click', () => {
    saveEntryLanguage(pendingLanguage);
    sessionStorage.removeItem('shine-language-return-page');
    navigate(returnPage);
  });

  screen.append(card);
  return screen;
}