hub/public/themes.js

'use strict';
// ---- Themes: each person picks an accent colour and Auto, Light, Dark or AMOLED black (true black, easy on phone batteries). Kept in their synced settings, so it follows them between devices.
const THEME_ACCENTS = [['blue', 'Blue', '#3d6bf0', '#6a8cff'], ['teal', 'Teal', '#0f8f8a', '#3cc7c0'], ['green', 'Green', '#2f9e6e', '#4cc98d'], ['orange', 'Orange', '#d9741a', '#f09a45'], ['red', 'Red', '#d4392f', '#ff6b60'], ['pink', 'Pink', '#c9407d', '#f26aa4'], ['purple', 'Purple', '#7b4fe0', '#a688ff']];
const THEME_PERSON = ['#4f7cff', '#2f9e6e', '#e0742b', '#d9453a', '#8a5cf0', '#e5a00d', '#0f8f8a', '#c9407d'];
const THEME_MODES = [['auto', 'Auto'], ['light', 'Light'], ['dark', 'Dark'], ['amoled', 'AMOLED']];
const THEME_VARS = {
  light: { '--bg': '#f5f6f8', '--panel': '#fff', '--panel2': '#eef0f4', '--text': '#14171c', '--muted': '#6a7280', '--line': '#e0e3e9' },
  dark: { '--bg': '#0f1115', '--panel': '#181b21', '--panel2': '#20242c', '--text': '#eceef2', '--muted': '#8b93a3', '--line': '#272c35' },
  amoled: { '--bg': '#000', '--panel': '#0b0b0d', '--panel2': '#16171b', '--text': '#eceef2', '--muted': '#8b93a3', '--line': '#1f2127' },
};
function themeApply() {
  const root = document.documentElement, mode = store.get('theme_mode', 'auto'), acc = THEME_ACCENTS.find(a => a[0] === store.get('theme_accent', 'blue')) || THEME_ACCENTS[0];
  const dark = mode === 'dark' || mode === 'amoled' || (mode === 'auto' && matchMedia('(prefers-color-scheme: dark)').matches);
  for (const k of Object.keys(THEME_VARS.light)) { if (mode === 'auto') root.style.removeProperty(k); else root.style.setProperty(k, THEME_VARS[mode][k]); }
  const hex = dark ? acc[3] : acc[2];
  if (acc[0] === 'blue' && mode === 'auto') { root.style.removeProperty('--accent'); root.style.removeProperty('--accent-t'); }
  else { const n = parseInt(hex.slice(1), 16), lum = (0.299 * (n >> 16) + 0.587 * ((n >> 8) & 255) + 0.114 * (n & 255)) / 255; root.style.setProperty('--accent', hex); root.style.setProperty('--accent-t', lum > .6 ? '#0b1020' : '#fff'); }
  const hc = !!store.get('a11y_contrast', false), size = +store.get('a11y_text', 1) || 1;
  const HC = dark ? { '--text': '#ffffff', '--muted': '#d3d8e2', '--line': '#7a8294' } : { '--text': '#000000', '--muted': '#33383f', '--line': '#6c7482' };
  for (const k of Object.keys(HC)) { if (hc) root.style.setProperty(k, HC[k]); else if (mode === 'auto') root.style.removeProperty(k); else root.style.setProperty(k, THEME_VARS[mode][k]); }
  root.classList.toggle('hc', hc); root.classList.toggle('rm', !!store.get('a11y_motion', false));
  const view = document.getElementById('view'); if (view) view.style.zoom = size === 1 ? '' : String(size); // larger text and controls for the page itself
  root.style.colorScheme = mode === 'auto' ? '' : dark ? 'dark' : 'light';
  const m = document.querySelector('meta[name=theme-color]'); if (m) m.content = dark ? (mode === 'amoled' ? '#000000' : '#0f1115') : (mode === 'light' ? '#f5f6f8' : m.content);
}
function themeStart() { themeApply(); try { matchMedia('(prefers-color-scheme: dark)').addEventListener('change', themeApply); } catch {} }
function themeSettings(el) {
  if (!el) return;
  const draw = () => {
    const mode = store.get('theme_mode', 'auto'), acc = store.get('theme_accent', 'blue');
    el.innerHTML = `<h2>Look and reading</h2><p class="sub">Saved for you and used on every device you sign in on.</p>
      <div class="seg" role="radiogroup" aria-label="Brightness">${THEME_MODES.map(([k, l]) => `<a href="#" role="radio" aria-checked="${mode === k}" data-m="${k}" class="${mode === k ? 'on' : ''}">${l}</a>`).join('')}</div>
      <div class="swatches" role="radiogroup" aria-label="Accent colour">${THEME_ACCENTS.map(([k, l, c]) => `<button type="button" role="radio" aria-checked="${acc === k}" aria-label="${l}" title="${l}" data-a="${k}" class="${acc === k ? 'on' : ''}" style="background:${c}"></button>`).join('')}</div>
      <h3 class="sub" style="margin:14px 0 0">Reading</h3>
      <div class="seg" role="radiogroup" aria-label="Text size">${[[1, 'Normal'], [1.15, 'Large'], [1.3, 'Extra large']].map(([v, l]) => `<a href="#" role="radio" aria-checked="${+store.get('a11y_text', 1) === v}" data-ts="${v}" class="${+store.get('a11y_text', 1) === v ? 'on' : ''}">${l}</a>`).join('')}</div>
      <div class="list"><label class="row" style="cursor:pointer"><span class="grow"><b>High contrast</b><small>Stronger text and borders</small></span><input type="checkbox" id="a11yhc"${store.get('a11y_contrast', false) ? ' checked' : ''}></label>
        <label class="row" style="cursor:pointer"><span class="grow"><b>Reduce motion</b><small>Fewer animations, whatever the device says</small></span><input type="checkbox" id="a11yrm"${store.get('a11y_motion', false) ? ' checked' : ''}></label></div>
      <h3 class="sub" style="margin:14px 0 0">My colour on shared calendars</h3><div class="swatches" role="radiogroup" aria-label="My colour on shared calendars">${(typeof ME !== 'undefined' && ME ? THEME_PERSON : []).map(c => `<button type="button" role="radio" aria-checked="${ME.color === c}" aria-label="${c}" data-pc="${c}" class="${ME.color === c ? 'on' : ''}" style="background:${c}"></button>`).join('')}</div>`;
    el.querySelectorAll('[data-ts]').forEach(a => a.onclick = e => { e.preventDefault(); store.set('a11y_text', +a.dataset.ts); themeApply(); draw(); });
    el.querySelector('#a11yhc').onchange = e => { store.set('a11y_contrast', e.target.checked); themeApply(); };
    el.querySelector('#a11yrm').onchange = e => { store.set('a11y_motion', e.target.checked); themeApply(); };
    el.querySelectorAll('[data-pc]').forEach(b => b.onclick = async () => { try { const r = await jfetch('/api/me/color', { method: 'POST', headers: { 'content-type': 'application/json' }, body: JSON.stringify({ color: b.dataset.pc }) }); ME.color = r.color; try { localStorage.setItem('me_cache', JSON.stringify(ME)); } catch {} draw(); } catch (e) { toast(e.message); } });
    el.querySelectorAll('[data-m]').forEach(a => a.onclick = e => { e.preventDefault(); store.set('theme_mode', a.dataset.m); themeApply(); draw(); });
    el.querySelectorAll('[data-a]').forEach(b => b.onclick = () => { store.set('theme_accent', b.dataset.a); themeApply(); draw(); });
  };
  draw();
}