/*
 * sophies.rocks
 *
 * Copyright (C) 2026 Zofia Szweda
 *
 * This file is part of sophies.rocks.
 *
 * sophies.rocks is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 *
 * sophies.rocks is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with sophies.rocks. If not, see <https://www.gnu.org/licenses/>.
 */

(function () {
  const THEMES = ['style', 'style-lightluster', 'style-tsoding', 'style-ashen'];
  const DEFAULT_THEME = 'style';
  const STORAGE_KEY = 'theme';

  const saved = localStorage.getItem(STORAGE_KEY);
  const theme = THEMES.includes(saved) ? saved : DEFAULT_THEME;

  const link = document.createElement('link');
  link.rel = 'stylesheet';
  link.id = 'theme-link';
  link.href = `${theme}.css`;
  document.head.appendChild(link);
  const style = document.createElement('style');
  style.textContent = `
    #menu-toggle {
      position: fixed;
      top: 1rem;
      left: 1rem;
      z-index: 100;
      font-size: 1.3rem;
      background: none;
      border: none;
      cursor: pointer;
    }
    #menu-panel {
      position: fixed;
      top: 3rem;
      left: 1rem;
      z-index: 100;
      background: var(--bg, #fff);
      border: 1px solid var(--border, #ccc);
      padding: 0.75rem;
      border-radius: 4px;
    }
    #menu-panel[hidden] { display: none; }
  `;
  document.head.appendChild(style);

  window.addEventListener('DOMContentLoaded', () => {
    const toggle = document.getElementById('menu-toggle');
    if (!toggle) return; // page doesn't have the button, skip menu setup

    const panel = document.createElement('div');
    panel.id = 'menu-panel';
    panel.hidden = true;
    panel.innerHTML = `
      <label for="theme-picker">theme:</label>
      <select id="theme-picker">
        <option value="style">default</option>
        <option value="style-lightluster">lightluster</option>
        <option value="style-tsoding">tsoding</option>
        <option value="style-ashen">ashen</option>
      </select>
    `;
    toggle.insertAdjacentElement('afterend', panel);

    toggle.addEventListener('click', () => {
      const isHidden = panel.hidden;
      panel.hidden = !isHidden;
      toggle.setAttribute('aria-expanded', String(isHidden));
    });

    const picker = document.getElementById('theme-picker');
    picker.value = theme;
    picker.addEventListener('change', () => {
      const chosen = picker.value;
      document.getElementById('theme-link').href = `${chosen}.css`;
      localStorage.setItem(STORAGE_KEY, chosen);
    });
  });
})();