// Shared dashboard helpers — extracted from the original monolithic
// dashboard JS as step 1 of the #406 split. These bits are used by
// both the tab dashboard (index.html) and the flow page (flow.html):
// pure DOM helpers, the side-panel singleton, the OS-notification
// module, and the path-link / file-preview infrastructure for the
// side panel.
//
// Each page now has its own entry point — `./tabs.js` for index.html,
// `./flow.js` for flow.html — and both import from here directly
// (#406 steps 2 + 3 complete; #406 closed).

import { linkify as termLinkify } from '@hive/shared/terminal.js';

// ─── helpers ────────────────────────────────────────────────────────────
export const $ = (id) => document.getElementById(id);

export const fmtAgeSecs = (s) => s < 60 ? `${s}s` : s < 3600 ? `${Math.floor(s/60)}m`
  : s < 86400 ? `${Math.floor(s/3600)}h` : `${Math.floor(s/86400)}d`;

export const esc = (s) => String(s).replace(/[&<>"]/g, (c) =>
  ({ '&':'&amp;', '<':'&lt;', '>':'&gt;', '"':'&quot;' }[c])
);

export const el = (tag, attrs = {}, ...children) => {
  const e = document.createElement(tag);
  for (const [k, v] of Object.entries(attrs)) {
    if (k === 'class') e.className = v;
    else if (k === 'html') e.innerHTML = v;
    else if (k.startsWith('data-')) e.setAttribute(k, v);
    else e.setAttribute(k, v);
  }
  for (const c of children) {
    if (c == null) continue;
    e.append(c.nodeType ? c : document.createTextNode(c));
  }
  return e;
};

export const form = (action, btnClass, btnLabel, confirmMsg, extra = {}, opts = {}) => {
  const f = el('form', {
    method: 'POST', action, class: 'inline', 'data-async': '',
    ...(confirmMsg ? { 'data-confirm': confirmMsg } : {}),
    // Endpoints whose mutation fires a DashboardEvent (and whose
    // derived store applies it live) opt out of the post-submit
    // /api/state refetch. See the async-form handler.
    ...(opts.noRefresh ? { 'data-no-refresh': '' } : {}),
  });
  for (const [name, value] of Object.entries(extra)) {
    f.append(el('input', { type: 'hidden', name, value }));
  }
  f.append(el('button', { type: 'submit', class: 'btn ' + btnClass }, btnLabel));
  return f;
};

// `truncate`, `fmtAgo`, `fmtElapsed`, `fmtDuration` stay in tabs.js
// for now — each has display-specific phrasing ("X running", "X ago")
// tied to its caller, so they don't generalise cleanly. We can lift
// them when a second consumer needs the same shape.

// ─── shared-worker SSE pipe (#448) ──────────────────────────────────────
// Returns an EventSource-shaped object backed by a SharedWorker that
// holds ONE upstream `new EventSource(url)` and fans events out to
// every connected tab. Replaces direct `new EventSource(url)` at the
// dashboard's two consumer sites (tabs.js inline + flow.js via
// terminal.js's `streamFactory` option) so N hyperhive tabs share
// ONE backend connection — way under the browser's per-host
// connection cap, immune to per-tab throttling that drops the SSE
// when Firefox suspends background tabs.
//
// Graceful fallback to direct EventSource on environments without
// SharedWorker (some embedded browsers, some Safari versions). The
// per-tab connection cost is the same as today — no regression.
//
// The page consumer uses the returned object like a regular
// EventSource: assign `onmessage` / `onopen` / `onerror`. `.close()`
// tells the worker to drop the subscription; the worker closes the
// upstream EventSource when the last subscriber leaves.
const SHARED_WORKER_PATH = '/static/stream-worker.js';
const SHARED_WORKER_NAME = 'hyperhive-stream';

// One SharedWorker port per page, reused by all openStream calls on
// that page. Invalidated on `pagehide` so a bfcache restore picks up
// a fresh port (the cached one may have been collected if all other
// tabs closed while this page was frozen — argus nit on #453).
let _sharedPort = null;
function makeSharedPort() {
  if (typeof SharedWorker === 'undefined') return null;
  try {
    const sw = new SharedWorker(SHARED_WORKER_PATH, SHARED_WORKER_NAME);
    sw.port.start();
    return sw.port;
  } catch (err) {
    console.warn('SharedWorker unavailable, falling back to direct EventSource:', err);
    return null;
  }
}
function getSharedPort() {
  if (!_sharedPort) _sharedPort = makeSharedPort();
  return _sharedPort;
}

// Registry of live subscriptions on this page. Keyed by url so a
// second openStream call for the same URL (would only happen on a
// hypothetical multi-consumer page) attaches to the existing route
// rather than overlapping. Each entry caches the route function so
// bfcache-restore re-bind can re-attach it to the fresh port.
//
// Today's pages only call openStream once with one URL; the registry
// shape just keeps the bfcache-restore path correct if that changes
// (e.g. /index.html later subscribing to two streams).
const _activeSubs = new Map();

// One-shot wiring of the page-wide lifecycle hooks: on bfcache
// freeze (`pagehide { persisted: true }`) we unsubscribe so the
// worker can close the upstream when the last live subscriber
// leaves; on bfcache restore (`pageshow { persisted: true }`) we
// invalidate the cached port (it may be dead if all other tabs
// closed during the freeze) and re-attach every active subscription
// to a fresh port. argus nit on #453: without this, the consumer's
// onmessage stays bound but no events flow after a bfcache restore.
let _lifecycleBound = false;
function bindLifecycleOnce() {
  if (_lifecycleBound) return;
  _lifecycleBound = true;
  window.addEventListener('pagehide', () => {
    if (!_sharedPort) return;
    for (const url of _activeSubs.keys()) {
      try { _sharedPort.postMessage({ kind: 'unsubscribe', url }); }
      catch { /* port dead — worker side already cleaned up */ }
    }
    // Drop port routes too; the bfcache-restore path will re-add
    // them on a fresh port. Leaving stale routes on a dead port
    // would just keep a closure alive without cost, but cleaning
    // up keeps the registry shape honest.
    for (const sub of _activeSubs.values()) {
      try { _sharedPort.removeEventListener('message', sub.route); }
      catch { /* same */ }
    }
    _sharedPort = null;
  });
  window.addEventListener('pageshow', (ev) => {
    if (!ev.persisted) return; // cold load — openStream just bound listeners
    if (!_activeSubs.size) return;
    const port = getSharedPort();
    if (!port) return; // SharedWorker really gone; fallback already in place
    for (const [url, sub] of _activeSubs) {
      sub.target.readyState = 0; // CONNECTING — the worker will fire 'open'
      port.addEventListener('message', sub.route);
      try { port.postMessage({ kind: 'subscribe', url }); }
      catch { /* port dead immediately — skip */ }
    }
  });
}

export function openStream(url) {
  const port = getSharedPort();
  if (!port) return new EventSource(url);
  bindLifecycleOnce();

  // Build an EventSource-shaped facade so consumer code is unchanged.
  // `target.onmessage` / `onopen` / `onerror` are assigned by the
  // consumer; the routing function below forwards events received
  // from the worker (filtered by url, since one port can multiplex
  // multiple subscriptions).
  const target = {
    onmessage: null,
    onopen: null,
    onerror: null,
    readyState: 0, // CONNECTING
    close() {
      const p = _sharedPort;
      if (p) {
        try { p.postMessage({ kind: 'unsubscribe', url }); }
        catch { /* port dead */ }
        try { p.removeEventListener('message', route); }
        catch { /* same */ }
      }
      _activeSubs.delete(url);
    },
  };
  const route = (e) => {
    const m = e.data;
    if (!m || m.url !== url) return;
    if (m.kind === 'open') {
      target.readyState = 1; // OPEN
      if (target.onopen) {
        try { target.onopen({ target }); }
        catch (err) { console.error('openStream onopen threw', err); }
      }
    } else if (m.kind === 'message') {
      if (target.onmessage) {
        try { target.onmessage({ data: m.data, target }); }
        catch (err) { console.error('openStream onmessage threw', err); }
      }
    } else if (m.kind === 'error') {
      if (target.onerror) {
        try { target.onerror({ target }); }
        catch (err) { console.error('openStream onerror threw', err); }
      }
    }
  };
  _activeSubs.set(url, { target, route });
  port.addEventListener('message', route);
  port.postMessage({ kind: 'subscribe', url });
  return target;
}

// ─── side panel ─────────────────────────────────────────────────────────
// Singleton drawer that swipes in from the right. Long content
// (file previews, approval diffs, journald logs, applied config)
// opens here via `Panel.open(title, node)` instead of expanding
// inline. Body is swapped on each open; closing just slides out so
// the content stays visible through the transition.
export const Panel = (() => {
  let root = null;
  let titleEl = null;
  let bodyEl = null;
  let drawer = null;
  /** Owner key set by `openNamed` (e.g. 'inbox'). `refresh(name, …)`
   *  is a no-op when the current owner doesn't match, so live
   *  updates can re-render an open view without grabbing focus
   *  from a closed one (or from an unrelated open view like a
   *  diff drill-in). Untyped calls via `open(title, content)`
   *  clear the owner — the legacy file-preview/diff/log paths
   *  don't participate in named-refresh semantics. */
  let owner = null;
  function ensure() {
    if (!root) {
      root = $('side-panel');
      titleEl = $('side-panel-title');
      bodyEl = $('side-panel-body');
      drawer = root && root.querySelector('.side-panel-drawer');
    }
    return root != null;
  }
  function open(title, content) {
    if (!ensure()) return;
    owner = null;
    titleEl.textContent = title;
    bodyEl.replaceChildren(...(content ? [content] : []));
    root.classList.add('open');
    root.setAttribute('aria-hidden', 'false');
  }
  function openNamed(name, title, content) {
    open(title, content);
    owner = name;
  }
  function refresh(name, title, content) {
    if (!ensure()) return;
    if (owner !== name) return;
    titleEl.textContent = title;
    bodyEl.replaceChildren(...(content ? [content] : []));
  }
  function close() {
    if (!ensure()) return;
    owner = null;
    root.classList.remove('open');
    root.setAttribute('aria-hidden', 'true');
  }
  // #451: drag-to-resize the drawer's width. Listens on a thin
  // hit-strip glued to the drawer's left edge; mousedown captures
  // pointermove + pointerup on the document so the drag continues
  // even if the cursor strays outside the 6px handle band. Width
  // persists to localStorage so it survives page reload. The CSS
  // clamps the value (min-width: 320px, max-width: 96vw) — drop
  // unparseable / out-of-range stored values silently.
  const WIDTH_KEY = 'hyperhive:side-panel-width';
  const WIDTH_MIN = 320;
  function clampWidth(w) {
    const max = Math.floor(window.innerWidth * 0.96);
    return Math.max(WIDTH_MIN, Math.min(max, w));
  }
  function applyStoredWidth() {
    if (!drawer) return;
    const raw = (() => {
      try { return localStorage.getItem(WIDTH_KEY); }
      catch { return null; }
    })();
    if (!raw) return;
    const parsed = parseInt(raw, 10);
    if (!Number.isFinite(parsed) || parsed <= 0) return;
    drawer.style.setProperty('--side-panel-w', clampWidth(parsed) + 'px');
  }
  function bindResize() {
    if (!drawer) return;
    const handle = document.createElement('div');
    handle.className = 'side-panel-resize';
    handle.setAttribute('role', 'separator');
    handle.setAttribute('aria-orientation', 'vertical');
    handle.setAttribute('aria-label', 'drag to resize side panel');
    handle.title = 'drag to resize';
    drawer.prepend(handle);
    let dragging = false;
    handle.addEventListener('pointerdown', (e) => {
      e.preventDefault();
      dragging = true;
      document.body.classList.add('side-panel-resizing');
      // Capture so we keep getting pointermove even when the cursor
      // outpaces the handle band (drag-fast-then-pause loses the
      // handle's :hover state otherwise).
      try { handle.setPointerCapture(e.pointerId); } catch { /* legacy */ }
    });
    document.addEventListener('pointermove', (e) => {
      if (!dragging) return;
      // Drawer is anchored to the right edge — width = viewport - pointer X.
      const w = clampWidth(window.innerWidth - e.clientX);
      drawer.style.setProperty('--side-panel-w', w + 'px');
    });
    function stopDrag() {
      if (!dragging) return;
      dragging = false;
      document.body.classList.remove('side-panel-resizing');
      // Persist the final width. Read the actual rendered width
      // rather than re-deriving so the stored value matches what
      // the operator saw at mouseup.
      const w = drawer.getBoundingClientRect().width;
      try { localStorage.setItem(WIDTH_KEY, String(Math.round(w))); }
      catch { /* localStorage unavailable — width is session-only */ }
    }
    document.addEventListener('pointerup', stopDrag);
    document.addEventListener('pointercancel', stopDrag);
    // Re-clamp on viewport resize so a persisted width that exceeds
    // 96vw doesn't push the drawer off-screen after a window shrink.
    window.addEventListener('resize', () => {
      if (dragging) return;
      const cur = drawer.getBoundingClientRect().width;
      const clamped = clampWidth(cur);
      if (clamped !== Math.round(cur)) {
        drawer.style.setProperty('--side-panel-w', clamped + 'px');
      }
    });
  }
  function bind() {
    if (!ensure()) return;
    $('side-panel-close').addEventListener('click', close);
    $('side-panel-backdrop').addEventListener('click', close);
    document.addEventListener('keydown', (e) => {
      if (e.key === 'Escape' && root.classList.contains('open')) close();
    });
    applyStoredWidth();
    bindResize();
  }
  return { open, openNamed, refresh, close, bind };
})();

// ─── path linkification ─────────────────────────────────────────────────
// Agents constantly drop pointer strings into messages + question
// bodies (it's the 1 KiB-cap escape hatch). Anything matching the
// PATH_RE patterns becomes a clickable anchor; clicking expands an
// inline <details> with the file's contents, fetched lazily from
// /api/state-file. The legacy in-container `/state/...` prefix is
// deliberately not matched — it's ambiguous from the host's
// perspective (we'd need to know which agent the message is about
// to translate it). Prefer `/agents/<name>/state/...` in agent
// outputs and the link will resolve.
async function fetchStateFile(path) {
  const resp = await fetch('/api/state-file?path=' + encodeURIComponent(path));
  const text = await resp.text();
  if (!resp.ok) throw new Error(text || ('HTTP ' + resp.status));
  return text;
}
// A 2-tab file preview: a "rendered" tab (default) + a raw-text tab.
// `renderRendered()` produces the rendered-tab node fresh on each
// switch; `plainText` backs the raw tab; `plainLabel` names it.
function buildTabbedPreview(renderRendered, plainText, plainLabel) {
  const tabs = el('div', { class: 'diff-base-tabs' });
  const host = el('div', { class: 'preview-host' });
  function show(mode) {
    for (const b of tabs.children) {
      b.classList.toggle('active', b.dataset.mode === mode);
    }
    host.replaceChildren(mode === 'plain'
      ? el('pre', { class: 'path-preview-body' }, plainText)
      : renderRendered());
  }
  for (const [mode, label] of [['rendered', 'rendered'], ['plain', plainLabel]]) {
    const b = el('button',
      { type: 'button', class: 'diff-base-tab', 'data-mode': mode }, label);
    b.addEventListener('click', () => show(mode));
    tabs.append(b);
  }
  show('rendered');
  return el('div', {}, tabs, host);
}
// Rendered <img> for an SVG, loaded via an <img> data: URI —
// <img>-loaded SVG runs in the browser's secure static mode (no
// scripts, no external fetches), so an untrusted SVG from an
// agent's state dir can't execute code in the dashboard.
function svgImage(text) {
  const img = el('img', { class: 'img-preview', alt: 'SVG preview' });
  img.addEventListener('error', () => {
    img.replaceWith(el('div', { class: 'meta' },
      '(could not render — see the source tab)'));
  });
  img.src = 'data:image/svg+xml,' + encodeURIComponent(text);
  return img;
}
// Marked-rendered markdown node (raw text fallback if `marked`
// failed to load).
function mdNode(text) {
  const div = el('div', { class: 'md' });
  if (window.marked && typeof window.marked.parse === 'function') {
    window.marked.setOptions({ breaks: true, gfm: true });
    div.innerHTML = window.marked.parse(text);
    // marked autolinks URLs but leaves them same-tab — open externally
    // so a click never navigates away from the dashboard. (issue #233)
    div.querySelectorAll('a[href]').forEach((a) => {
      a.target = '_blank';
      a.rel = 'noopener noreferrer';
    });
  } else {
    div.textContent = text;
  }
  return div;
}
// Raster image extensions the preview renders as an <img> pointed
// straight at /api/state-file (served binary with a real
// content-type). SVG is handled on the text path instead.
const RASTER_RE = /\.(png|jpe?g|gif|webp|bmp|ico|avif)$/i;
// Lazy-load `path` from /api/state-file into the side panel.
// Markdown + SVG get a rendered/plain tabbed view; raster images
// render as an <img>; every other file stays raw text in a <pre>.
async function openFilePanel(path) {
  if (RASTER_RE.test(path)) {
    const img = el('img', { class: 'img-preview', alt: path });
    img.addEventListener('error', () => {
      img.replaceWith(el('pre', { class: 'path-preview-body' },
        '(could not load image — it may be missing or over the preview size cap)'));
    });
    img.src = '/api/state-file?path=' + encodeURIComponent(path);
    Panel.open('↳ ' + path, img);
    return;
  }
  const isMd = /\.(md|markdown)$/i.test(path);
  const isSvg = /\.svg$/i.test(path);
  const view = el('div');
  view.textContent = '(fetching…)';
  Panel.open('↳ ' + path, view);
  try {
    const text = await fetchStateFile(path);
    if (isSvg) {
      view.replaceChildren(buildTabbedPreview(() => svgImage(text), text, 'source'));
    } else if (isMd) {
      view.replaceChildren(buildTabbedPreview(() => mdNode(text), text, 'plain'));
    } else {
      view.replaceChildren(el('pre', { class: 'path-preview-body' }, text));
    }
  } catch (e) {
    view.textContent = 'error: ' + (e.message || e);
  }
}
export function makePathLink(path) {
  const anchor = el('a', {
    href: '#', class: 'path-link', title: 'open ' + path + ' in panel',
  }, path);
  anchor.addEventListener('click', (e) => {
    e.preventDefault();
    openFilePanel(path);
  });
  return anchor;
}
// Append a plain-text run, with bare http(s) URLs turned into clickable
// links via the shared terminal linkifier.
export function appendText(parent, s) {
  if (!s) return;
  parent.appendChild(termLinkify(s));
}
// Append `text` to `parent` as a mix of text nodes + path anchors.
// `refs` is the server-attached `file_refs` array (verified-file
// tokens that appear in `text`); each occurrence of a ref becomes a
// clickable anchor that opens the file in the side panel. Anything
// not in `refs` stays plain text. No client-side regex, no probe
// endpoint — the server saw the body first and made the call. When
// `refs` is empty/missing we just emit plain text.
export function appendLinkified(parent, text, refs) {
  if (text == null) return;
  const str = String(text);
  const tokens = (refs || []).slice();
  if (!tokens.length) {
    appendText(parent, str);
    return;
  }
  // Walk the string left-to-right, at each step looking for the
  // next occurrence of any token. Longest-first tie-break so a
  // ref like `/agents/foo/state/x.md` wins over a (hypothetical)
  // shorter token that prefixes it. O(text * refs) worst case;
  // refs is bounded server-side to whatever fits in a body, so
  // this stays cheap.
  tokens.sort((a, b) => b.length - a.length);
  let i = 0;
  while (i < str.length) {
    let bestStart = -1;
    let bestToken = null;
    for (const t of tokens) {
      const idx = str.indexOf(t, i);
      if (idx === -1) continue;
      if (bestStart === -1 || idx < bestStart || (idx === bestStart && t.length > bestToken.length)) {
        bestStart = idx;
        bestToken = t;
      }
    }
    if (bestStart === -1) {
      appendText(parent, str.slice(i));
      break;
    }
    if (bestStart > i) {
      appendText(parent, str.slice(i, bestStart));
    }
    parent.appendChild(makePathLink(bestToken));
    i = bestStart + bestToken.length;
  }
}

// ─── browser notifications ──────────────────────────────────────────────
// Fires OS notifications on three operator-bound signals:
//   - new approval landed in the queue
//   - new operator question queued (ask, target IS NULL)
//   - broker message sent `to: "operator"`
// Permission grant is per-browser; a localStorage "muted" toggle lets
// the operator silence without revoking. Secure-context only (HTTPS /
// localhost) — on other origins the API is unavailable and we hide
// the controls.
export const NOTIF = (() => {
  const supported = typeof Notification !== 'undefined';
  const MUTED_KEY = 'hyperhive.notify.muted';
  const isMuted  = () => localStorage.getItem(MUTED_KEY) === '1';
  const setMuted = (v) => v
    ? localStorage.setItem(MUTED_KEY, '1')
    : localStorage.removeItem(MUTED_KEY);
  function renderControls() {
    const enable = $('notif-enable');
    const mute   = $('notif-mute');
    const unmute = $('notif-unmute');
    const status = $('notif-status');
    if (!enable || !mute || !unmute || !status) return;
    if (!supported) {
      enable.hidden = mute.hidden = unmute.hidden = true;
      status.hidden = false;
      status.textContent = 'notifications unsupported in this browser';
      return;
    }
    const perm = Notification.permission;
    enable.hidden = perm === 'granted';
    mute.hidden   = perm !== 'granted' || isMuted();
    unmute.hidden = perm !== 'granted' || !isMuted();
    status.hidden = perm !== 'denied';
    if (perm === 'denied') status.textContent = 'notifications blocked — grant in site settings';
  }
  function bind() {
    const enable = $('notif-enable');
    const mute   = $('notif-mute');
    const unmute = $('notif-unmute');
    if (!supported || !enable || !mute || !unmute) return;
    enable.addEventListener('click', async () => {
      await Notification.requestPermission();
      renderControls();
    });
    mute.addEventListener('click', () => { setMuted(true); renderControls(); });
    unmute.addEventListener('click', () => { setMuted(false); renderControls(); });
    renderControls();
  }
  function show(title, body, tag) {
    if (!supported) {
      console.debug('notify: Notification API not supported');
      return;
    }
    if (Notification.permission !== 'granted') {
      console.debug('notify: permission not granted', Notification.permission);
      return;
    }
    if (isMuted()) {
      console.debug('notify: muted');
      return;
    }
    try {
      // Per-event tag so distinct messages stack instead of
      // collapsing into one slot. Caller passes a unique tag per
      // notification kind/id; we don't fall back to 'hyperhive'
      // because that one tag would replace itself on every fire.
      const n = new Notification(title, {
        body,
        tag: tag || ('hyperhive:' + Date.now()),
      });
      n.onclick = () => { window.focus(); n.close(); };
      console.debug('notify: shown', title, 'tag=', tag);
    } catch (err) {
      console.warn('notification show failed', err);
    }
  }
  return { bind, show, renderControls };
})();