/* Guardian PWA client (FEP-633c): renders the dashboard, adopts wards, and
   manages the guardian push channel. No framework, no inline scripts (CSP).
   All user-facing text comes from state.strings (server i18n). */
(function () {
  'use strict';
  // A crash here used to fail silently (buttons just do nothing). Surface it on
  // the page AND the console so the cause is visible instead of "everything hangs".
  function fatal(msg) {
    try {
      var b = document.getElementById('g-fatal') || document.createElement('div');
      b.id = 'g-fatal'; b.className = 'g-msg err';
      b.style.cssText = 'display:block;margin:12px 0;padding:10px 14px';
      b.textContent = 'Guardian: ' + msg;
      var root = document.querySelector('main') || document.body;
      if (!b.parentNode && root) root.insertBefore(b, root.firstChild);
    } catch (e) { /* last resort */ }
    try { console.error('[guardian]', msg); } catch (e) { /* no console */ }
  }
  try {
  var S = JSON.parse(document.getElementById('guardian-state').textContent || '{}');
  var T = S.strings || {};

  function el(tag, cls, text) {
    var n = document.createElement(tag);
    if (cls) n.className = cls;
    if (text != null) n.textContent = text;
    return n;
  }
  function handleOf(uri, cached) {
    if (cached && cached.charAt(0) === '@') return cached;   // trust only real @handles
    try { var u = new URL(uri); return '@' + u.pathname.split('/').filter(Boolean).pop() + '@' + u.host; }
    catch (e) { return uri; }
  }
  // The server hands over a timestamp already formatted in the site's timezone
  // (Beheer -> Instellingen), the same clock de Krant and Berichten show. The
  // slice is only a fallback for a row that predates that field: it shows raw
  // UTC, which is what made a 20:20 call for help read 18:20.
  function when(item, raw) {
    if (item && item.when_text) return item.when_text;
    return String(raw || '').slice(0, 16).replace('T', ' ');
  }
  function show(id, on) { document.getElementById(id).hidden = !on; }

  // ── 1. Help requests ───────────────────────────────────────────────────
  // A call for help is not an alarm: it may well be settled quietly between a
  // guardian and the child. So the card carries no siren, it just has to be
  // impossible to miss. It shows up twice on purpose (Robins keuze): the recent
  // ones across all children at the top, the full history of one child in that
  // child's panel.
  var HELP_TOP = 5;

  function helpCard(h) {
    var card = el('div', 'g-card help');
    var row = el('div', 'row');
    var who = el('span', 'who grow');
    // name_html carries the custom emojis (FEP-9098) of the display name, the
    // same way de Krant renders a byline. Falls back to the plain name.
    if (h.name_html) who.innerHTML = h.name_html;
    else who.textContent = h.actor_name || handleOf(h.actor_uri, h.actor_handle);
    row.appendChild(who);
    row.appendChild(el('span', 'when', when(h, h.published || h.created_at)));
    card.appendChild(row);
    var body = el('div', 'body g-note');
    // body_html is the shared note-body partial, rendered server-side: the
    // content with its emojis, the quote / link-preview card and the media.
    // Falls back to the bare content for rows stored before that existed.
    body.innerHTML = h.body_html || h.content || '';   // sanitized server-side on ingest
    card.appendChild(body);
    if (h.note_url) {
      var a = el('a', 'g-link', T.open || 'open');
      a.href = h.note_url; a.target = '_blank'; a.rel = 'noopener';
      card.appendChild(a);
    }
    return card;
  }

  function renderHelp() {
    var list = document.getElementById('help-list');
    list.textContent = '';
    var help = S.help || [];
    help.slice(0, HELP_TOP).forEach(function (h) { list.appendChild(helpCard(h)); });
    if (help.length > HELP_TOP) {
      list.appendChild(el('p', 'g-sec-sub', '+ ' + (help.length - HELP_TOP) + ' — ' + (T.panel_help || '')));
    }
    var badge = document.getElementById('help-count');
    badge.textContent = help.length; badge.hidden = help.length === 0;
    show('help-empty', help.length === 0);
  }

  // ── 3. Offers I am a party to (sent, or a co-guardianship to co-approve) ─
  function answer(offerId, decision, btn) {
    if (btn) btn.disabled = true;
    fetch('/guardian/offer', {
      method: 'POST', headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ offer: offerId, answer: decision, site: S.site }),
    }).then(refresh);
  }
  function offerCard(o) {
    var card = el('div', 'g-card');
    var row = el('div', 'row');
    var subject = o['shaer:iAmCandidate']
      ? handleOf(o['shaer:ward'], o['shaer:wardHandle'])            // my sent offer: about the ward
      : handleOf(o['shaer:candidate'], o['shaer:candidateHandle']); // co-guard: who wants in
    row.appendChild(el('span', 'who grow', subject));
    if (o['shaer:iAmCandidate']) {
      // My own offer, waiting for the others to accept.
      row.appendChild(el('span', 'tag wait', T.pending));
      var rt = el('button', 'quiet small', T.retract);
      rt.addEventListener('click', function () { answer(o.id, 'reject', rt); });
      row.appendChild(rt);
    } else if (o['shaer:needsMyAccept']) {
      // A co-guardianship offer for a ward I already guard: my call.
      row.appendChild(el('span', 'tag co', T.coguard));
      var ac = el('button', 'small', T.accept);
      ac.addEventListener('click', function () { answer(o.id, 'accept', ac); });
      var rj = el('button', 'quiet small', T.reject);
      rj.addEventListener('click', function () { answer(o.id, 'reject', rj); });
      row.appendChild(ac); row.appendChild(rj);
    } else {
      row.appendChild(el('span', 'tag wait', T.awaiting_others));
    }
    card.appendChild(row);
    return card;
  }
  function renderPending() {
    var list = document.getElementById('pending-list');
    list.textContent = '';
    var offers = S.offers || [];
    offers.forEach(function (o) { list.appendChild(offerCard(o)); });
    show('pending-section', offers.length > 0);
  }

  // ── 4. Accepted wards: one panel per child ─────────────────────────────
  // A guardian thinks per child, not per function, so everything about one
  // child sits behind that child's row: the gated settings, the follow requests
  // waiting on them, their calls for help, their recent posts. The row itself
  // carries counts, so nothing that needs an answer hides inside a closed
  // panel.
  var openPanels = {};   // ward uri -> open, so a refresh does not close it
  // The follow requests and the wards' posts arrive from their own endpoints
  // and are grouped into the panels by ward, so they are cached here rather
  // than rendered into a section of their own.
  var FEED = [], FOLLOWS = [];

  function sectionInto(panel, title, items, empty, build) {
    var h = el('div', 'g-panel-sec');
    h.appendChild(el('h3', null, title));
    if (!items.length) h.appendChild(el('p', 'g-empty small', empty));
    else items.forEach(function (it) { h.appendChild(build(it)); });
    panel.appendChild(h);
    return h;
  }

  function embedsButton(w) {
    // Gated feature: external (non-fediverse) embeds. Off by default for a
    // ward; only a guardian can open it, and the gate is enforced server-side
    // when the feed is built, so this button is the only thing that moves it.
    // Shown for EVERY ward, including one on another server. There the value is
    // unknown (it lives on the ward's server), but proposing is exactly as
    // possible: the proposal travels, the ward's server tallies the guardians
    // and enforces. A guardian next door must not have more say than one far
    // away.
    var known = w.embeds === true || w.embeds === false;
    var emb = el('button', 'quiet small',
      (known ? (w.embeds ? T.embeds_on : T.embeds_off) : T.embeds_propose) || 'Link previews');
    emb.addEventListener('click', function () {
      emb.disabled = true;
      fetch('/guardian/wards/embeds', {
        method: 'POST', headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ uri: w.other_uri, allow: known ? !w.embeds : true }),
      }).then(function (r) { return r.json(); })
        .then(function (j) {
          // Not settled yet: the other guardians still have to answer.
          if (j && j.state === 'open') {
            emb.textContent = (T.embeds_waiting || 'waiting for the other guardians');
            emb.disabled = true;
            return;
          }
          refresh();
        })
        .catch(function () { emb.disabled = false; });
    });
    return emb;
  }

  function wardPanel(w) {
    var uri = w.other_uri;
    var panel = el('div', 'g-panel');
    panel.hidden = !openPanels[uri];

    var set = el('div', 'g-panel-sec');
    set.appendChild(el('h3', null, T.settings_title || 'Settings'));
    var setRow = el('div', 'row');
    setRow.appendChild(embedsButton(w));
    set.appendChild(setRow);
    panel.appendChild(set);

    sectionInto(panel, T.panel_follow || 'Follow requests',
      FOLLOWS.filter(function (f) { return f.wardUri === uri; }),
      T.panel_follow_empty || '', followCard);

    sectionInto(panel, T.panel_help || 'Calls for help',
      (S.help || []).filter(function (h) { return h.actor_uri === uri; }),
      T.panel_help_empty || '', helpCard);

    sectionInto(panel, T.panel_posts || 'Recent posts',
      FEED.filter(function (p) { return p.authorUri === uri; }),
      T.panel_posts_empty || '', feedCard);

    var act = el('div', 'g-panel-sec');
    act.appendChild(el('h3', null, T.panel_actions || 'Actions'));
    var actRow = el('div', 'row');
    var wave = el('button', 'small', T.wave || '👋 Wave');
    wave.addEventListener('click', function () { sendWave(uri, wave); });
    actRow.appendChild(wave);
    var rel = el('button', 'quiet small', T.release);
    // Releasing a ward is heavy and hard to undo (coming back needs a fresh
    // offer the ward accepts), so it asks first and spells out what changes.
    rel.addEventListener('click', function () {
      var who = handleOf(uri, w.other_handle);
      var msg = (T.release_confirm || 'Release {who}?').replace('{who}', who);
      if (window.confirm(msg)) remove(uri, rel);
    });
    actRow.appendChild(rel);
    act.appendChild(actRow);
    panel.appendChild(act);
    return panel;
  }

  function renderWards() {
    var list = document.getElementById('wards-list');
    list.textContent = '';
    var wards = S.wards || [];
    wards.forEach(function (w) {
      var uri = w.other_uri;
      var card = el('div', 'g-card ward');
      var row = el('div', 'row');
      row.appendChild(el('span', 'who grow', handleOf(uri, w.other_handle)));
      // Counts on the row: whatever is waiting must be visible with the panel shut.
      var nHelp = (S.help || []).filter(function (h) { return h.actor_uri === uri; }).length;
      var nFollow = FOLLOWS.filter(function (f) { return f.wardUri === uri; }).length;
      if (nHelp) row.appendChild(el('span', 'tag help', '🛟 ' + nHelp));
      if (nFollow) row.appendChild(el('span', 'tag co', nFollow + ' ' + (nFollow === 1 ? (T.badge_follow_one || '') : (T.badge_follow || ''))));
      row.appendChild(el('span', 'tag ok', T.active));
      var toggle = el('button', 'quiet small', openPanels[uri] ? T.panel_close : T.panel_open);
      row.appendChild(toggle);
      card.appendChild(row);
      var panel = wardPanel(w);
      card.appendChild(panel);
      toggle.addEventListener('click', function () {
        openPanels[uri] = !openPanels[uri];
        panel.hidden = !openPanels[uri];
        toggle.textContent = openPanels[uri] ? T.panel_close : T.panel_open;
      });
      list.appendChild(card);
    });
    show('wards-empty', wards.length === 0);
  }

  function sendWave(uri, btn) {
    btn.disabled = true;
    fetch('/guardian/api/wave', {
      method: 'POST', headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ ward: uri, site: S.site }),
    }).then(function (r) { return r.json(); })
      .then(function (j) { btn.disabled = false; btn.textContent = (j && j.ok) ? (T.waved || '👋 sent') : (T.wave || '👋 Wave'); })
      .catch(function () { btn.disabled = false; });
  }

  function remove(uri, btn) {
    btn.disabled = true;
    fetch('/guardian/wards/remove', {
      method: 'POST', headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ uri: uri, site: S.site }),
    }).then(refresh);
  }

  function renderAll() { renderHelp(); renderPending(); renderWards(); }

  // ── 0. Wards' corner: read-only feed of your wards' posts ───────────────
  // Lives inside each child's panel now, so the fetches only fill a cache and
  // ask the ward list to redraw. A guardian watches, it does not publish.
  function feedCard(p) {
    var card = el('div', 'g-card feed');
    var head = el('div', 'row');
    head.appendChild(el('span', 'who grow', p.author));
    if (p.published) head.appendChild(el('span', 'g-when', when(p, p.published)));
    card.appendChild(head);
    var body = el('div', 'feed-body');
    if (p.cw) {
      var d = document.createElement('details');
      var sum = document.createElement('summary'); sum.textContent = p.cw; d.appendChild(sum);
      var inner = el('div'); inner.innerHTML = p.content || ''; d.appendChild(inner);
      body.appendChild(d);
    } else {
      body.innerHTML = p.content || '';   // server-sanitized HTML (same as Berichten)
    }
    card.appendChild(body);
    return card;
  }

  function loadFeed() {
    return fetch('/guardian/api/feed?site=' + encodeURIComponent(S.site))
      .then(function (r) { return r.json(); })
      .then(function (f) { if (f && !f.error) { FEED = f.items || []; renderWards(); } })
      .catch(function () { /* panels just show "nothing yet" */ });
  }

  // ── 0b. Follow requests on your wards (§5.3) ────────────────────────────
  function answerFollow(id, decision, btn) {
    if (btn) btn.disabled = true;
    fetch('/guardian/api/follow/' + encodeURIComponent(id), {
      method: 'POST', headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ decision: decision, site: S.site }),
    }).then(loadFollowReqs);
  }
  function followCard(f) {
    var card = el('div', 'g-card');
    var row = el('div', 'row');
    // Inside the child's own panel the ward name is a given, so only the
    // person asking is named here.
    row.appendChild(el('span', 'who grow', f.follower));
    var ok = el('button', 'small', T.accept || 'Accept');
    ok.addEventListener('click', function () { answerFollow(f.id, 'approve', ok); });
    var no = el('button', 'quiet small', T.reject || 'Deny');
    no.addEventListener('click', function () { answerFollow(f.id, 'reject', no); });
    row.appendChild(ok); row.appendChild(no);
    card.appendChild(row);
    return card;
  }
  function loadFollowReqs() {
    return fetch('/guardian/api/follow-requests?site=' + encodeURIComponent(S.site))
      .then(function (r) { return r.json(); })
      .then(function (f) { if (f && !f.error) { FOLLOWS = f.items || []; renderWards(); } })
      .catch(function () { /* panels just show "none waiting" */ });
  }

  function refresh() {
    return fetch('/guardian/api/state?site=' + encodeURIComponent(S.site))
      .then(function (r) { return r.json(); })
      .then(function (s) { if (s && !s.error) { S = s; T = s.strings || T; renderAll(); } })
      .then(loadFeed).then(loadFollowReqs);
  }

  // ── 2. Adopt ───────────────────────────────────────────────────────────
  var form = document.getElementById('adopt-form');
  var input = document.getElementById('adopt-handle');
  var adoptBtn = document.getElementById('adopt-btn');
  var msg = document.getElementById('adopt-msg');
  function setMsg(text, isErr) { msg.hidden = false; msg.className = 'g-msg' + (isErr ? ' err' : ''); msg.textContent = text; }

  form.addEventListener('submit', function (ev) {
    ev.preventDefault();
    var handle = input.value.trim();
    if (!handle) return;
    adoptBtn.disabled = true;
    setMsg(T.sending || '…', false);
    fetch('/guardian/adopt', {
      method: 'POST', headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ handle: handle, site: S.site }),
    }).then(function (r) { return r.json().then(function (j) { return { ok: r.ok, j: j }; }); })
      .then(function (res) {
        adoptBtn.disabled = false;
        if (res.ok) {
          input.value = '';
          // Always refresh: the offer is recorded even if delivery is still
          // in flight. Show it under "Verzonden aanvragen".
          setMsg(res.j.delivered === false ? T.sent_retry : T.sent, false);
          refresh();
        } else {
          setMsg((res.j.error === 'not_found' ? T.not_found : T.failed) , true);
        }
      })
      .catch(function () { adoptBtn.disabled = false; setMsg(T.network, true); });
  });

  // ── Site picker ────────────────────────────────────────────────────────
  var picker = document.getElementById('site-picker');
  if (picker) picker.addEventListener('change', function () {
    location.href = '/guardian?site=' + encodeURIComponent(picker.value);
  });

  // ── 5. Push ────────────────────────────────────────────────────────────
  var toggle = document.getElementById('push-toggle');
  var pmsg = document.getElementById('push-msg');
  function pushState() {
    if (!('serviceWorker' in navigator) || !('PushManager' in window)) { toggle.disabled = true; return; }
    navigator.serviceWorker.register('/sw.js').catch(function () {});
    navigator.serviceWorker.ready
      .then(function (reg) { return reg.pushManager.getSubscription(); })
      .then(function (sub) {
        toggle.textContent = sub ? toggle.dataset.onLabel : toggle.dataset.offLabel;
        toggle.dataset.subscribed = sub ? '1' : '';
        toggle.classList.toggle('is-on', !!sub);
      });
  }
  function urlB64(base64) {
    var pad = '='.repeat((4 - (base64.length % 4)) % 4);
    var b = (base64 + pad).replace(/-/g, '+').replace(/_/g, '/');
    var raw = atob(b); var arr = new Uint8Array(raw.length);
    for (var i = 0; i < raw.length; i++) arr[i] = raw.charCodeAt(i);
    return arr;
  }
  toggle.addEventListener('click', function () {
    pmsg.hidden = true;
    navigator.serviceWorker.ready.then(function (reg) {
      if (toggle.dataset.subscribed) {
        reg.pushManager.getSubscription().then(function (sub) {
          if (!sub) return;
          fetch('/push/unsubscribe', {
            method: 'POST', headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ endpoint: sub.endpoint }),
          }).then(function () { return sub.unsubscribe(); }).then(pushState);
        });
        return;
      }
      fetch('/push/vapid').then(function (r) { return r.json(); }).then(function (v) {
        if (!v.publicKey) throw new Error('no key');
        return reg.pushManager.subscribe({ userVisibleOnly: true, applicationServerKey: urlB64(v.publicKey) });
      }).then(function (sub) {
        return fetch('/push/subscribe', {
          method: 'POST', headers: { 'Content-Type': 'application/json' },
          body: JSON.stringify({
            subscription: sub.toJSON(),
            alerts: { help: 1, guardian: 1, dm: 1, follow: 0, reply: 0, like: 0, boost: 0 },
            uaLabel: 'Guardian PWA',
          }),
        });
      }).then(pushState).catch(function (e) {
        pmsg.hidden = false; pmsg.className = 'g-msg err';
        pmsg.textContent = (T.push_unavailable || 'Push unavailable') + ': ' + e.message;
      });
    });
  });

  renderAll(); pushState(); loadFeed(); loadFollowReqs();
  setInterval(refresh, 45000);   // live-ish while open
  } catch (e) {
    fatal((e && e.message) || String(e));
  }
})();