'use strict';

// Two navigation levels; scraper tabs stay within their section, not another menu.
const SETTINGS_SECTIONS = [
  { id: 'user/reading', group: 'User', title: 'Reading', hint: 'Reader modes, page spacing and zoom.' },
  { id: 'user/reading-hours', group: 'User', title: 'Reading hours', hint: 'When this server allows chapter reading.' },
  { id: 'user/reading-time', group: 'User', title: 'Reading time & privacy', hint: 'Your clock, Reading Story and personal data.' },
  { id: 'user/notifications', group: 'User', title: 'Notifications', hint: 'Chapter alerts and your optional webhook.' },
  { id: 'user/account', group: 'User', title: 'Account', hint: 'Your account and password.' },
  { id: 'admin/scraper', group: 'Admin', title: 'Scraper', hint: 'Live activity, downloads, update checks and sources.' },
  { id: 'admin/peering', group: 'Admin', title: 'Peering', hint: 'Pair servers and manage their permissions.', href: 'peers.html#admin' },
  { id: 'admin/peer-catalog', group: 'Admin', title: 'Peer catalogs', hint: 'Approve titles to share and browse peer libraries.', href: 'peer-catalog.html' },
  { id: 'admin/library', group: 'Admin', title: 'Server & library', hint: 'Library location, scan status and maintenance.' },
  { id: 'admin/users', group: 'Admin', title: 'Users & access', hint: 'Manage accounts, passwords and administrators.' },
  { id: 'admin/collections', group: 'Admin', title: 'Collections & metadata', hint: 'Group manga and review their relationships.', href: 'collections.html' },
  { id: 'admin/health', group: 'Admin', title: 'Service health', hint: 'Service status, incidents and recovery.', href: 'health.html' },
];
const SCRAPER_TABS = ['activity', 'queue', 'updates', 'sources'];
const READING_DAYS = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];

function readingDayText(schedule, index) {
  const previous = (index + 6) % 7;
  const carried = schedule.days[previous].filter(([start, end]) => end < start)
    .map(([, end]) => `00:00–${end} (from ${READING_DAYS[previous]})`);
  const starting = schedule.days[index].map(([start, end]) => `${start}–${end}${end < start ? ' (next day)' : ''}`);
  return [...carried, ...starting].join(' · ') || 'Closed all day';
}

function settingsRoute(hash, admin) {
  const parts = String(hash || '').replace(/^#/, '').split('/');
  const candidate = parts.slice(0, 2).join('/'), tab = parts[2];
  const section = SETTINGS_SECTIONS.find(item => item.id === candidate && (admin || item.group === 'User'));
  return { id: section?.id || 'user/reading', tab: SCRAPER_TABS.includes(tab) ? tab : tab === 'hosters' ? 'sources' : 'activity' };
}

function settingsShell(me, active = 'user/reading') {
  const main = $('main'); main.textContent = '';
  const nav = h('nav', { class: 'settings-menu', 'aria-label': 'Settings sections' });
  const links = new Map();
  for (const group of me.admin ? ['User', 'Admin'] : ['User']) {
    nav.append(h('div', { class: 'settings-menu-group' }, h('h2', {}, group),
      SETTINGS_SECTIONS.filter(section => section.group === group).map(section => {
        const link = h('a', { href: section.href || 'settings.html#' + section.id }, section.title);
        links.set(section.id, link);
        return link;
      })));
  }
  const crumb = h('p', { class: 'settings-breadcrumb muted small' });
  const title = h('h1', { tabindex: '-1' });
  const titleRow = h('div', { class: 'settings-title-row' }, title);
  const hint = h('p', { class: 'muted settings-hint' });
  const content = h('div', { class: 'settings-content' });
  main.append(h('div', { class: 'settings-layout' }, nav,
    h('div', { class: 'settings-workspace' }, crumb, titleRow, hint, content)));
  function select(id, focus = false) {
    const section = SETTINGS_SECTIONS.find(item => item.id === id);
    if (!section || (section.group === 'Admin' && !me.admin)) return;
    for (const [key, link] of links) {
      if (key === id) link.setAttribute('aria-current', 'page');
      else link.removeAttribute('aria-current');
    }
    crumb.textContent = 'Settings / ' + section.group;
    title.textContent = section.title;
    hint.textContent = section.hint;
    document.title = section.title + ' · Settings · MangaCircus';
    if (focus) title.focus({ preventScroll: true });
  }
  select(active);
  return { content, titleRow, select };
}

if (typeof module !== 'undefined') module.exports = { SETTINGS_SECTIONS, SCRAPER_TABS, settingsRoute, readingDayText };