import { renderHeader } from '../components/header.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 }) {
  const screen = document.createElement('section');
  screen.className = 'stack language-screen';
  const returnPage = resolveReturnPage();

  screen.append(
    renderHeader({
      title: 'Язык / Language',
      leftAction: { 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-choice-grid" role="radiogroup" aria-label="Язык интерфейса">
      <button class="language-choice-option${state.entrySettings.language === 'ru' ? ' is-selected' : ''}" type="button" data-language="ru" role="radio" aria-checked="${state.entrySettings.language === 'ru'}">
        <span class="language-choice-name">Русский</span>
        <span class="language-choice-code">RU</span>
      </button>
      <button class="language-choice-option${state.entrySettings.language === 'en' ? ' is-selected' : ''}" type="button" data-language="en" role="radio" aria-checked="${state.entrySettings.language === 'en'}">
        <span class="language-choice-name">English</span>
        <span class="language-choice-code">EN</span>
      </button>
    </div>
  `;

  card.querySelectorAll('[data-language]').forEach((button) => {
    button.addEventListener('click', () => {
      const language = String(button.dataset.language || 'ru');
      saveEntryLanguage(language);
      card.querySelectorAll('[data-language]').forEach((item) => {
        const selected = item === button;
        item.classList.toggle('is-selected', selected);
        item.setAttribute('aria-checked', String(selected));
      });
      sessionStorage.removeItem('shine-language-return-page');
      navigate(returnPage);
    });
  });

  screen.append(card);
  return screen;
}