// M4TR1X ACC0UNTS page entry (/matrix-accounts.html).
//
// Operator surface to provision / log in a per-agent EXTERNAL matrix
// account and store its access token, without editing the agent's config
// repo. Companion to the multi-account harness support.
//
// Backend contract:
//   GET  /api/matrix-accounts?agent=<name>
//        -> { accounts: [{name, homeserver, token_present, live, user_id}],
//             as_of_unix: int|null }
//   POST /api/matrix-account-login (x-www-form-urlencoded)
//        fields: agent, account, homeserver, mode=password|token,
//                user_id?, password?, token?
//        -> 200 { ok: true, user_id }. Error body shape-agnostic: plain text
//           today, migrating to RFC 9457 problem+json { detail, … }.
//   Token is never echoed; page never re-renders a submitted secret.
//
// Live status dot — the daemon heartbeats every ~30s (advances as_of_unix),
// so a stalled as_of = daemon dead, not just stale snapshot:
//   green      live + running + fresh          = online
//   dim green  live but as_of stale > ~90s     = heartbeat stopped
//   amber      live + container DOWN           = definitively stale
//   amber      token_present + !live           = provisioned but offline
//   grey       no token                        = not provisioned
// Container state takes precedence; as_of_unix is tooltipped for freshness.
// v1 backend (no `live` field) falls back to token-present rendering.

import { $, el, esc, fmtAgeSecs, renderServerWarnings } from './common.js';

let agents = [];
// agent name → container running (bool), from /api/state. Cross-referenced by
// the live dot: a `live: true` account whose container is DOWN is definitively
// stale (the daemon can't be up if the container isn't), so we flag it rather
// than show a lying green. `undefined` (agent not in the map) = unknown → we
// don't flag stale.
const containerRunning = new Map();

async function loadState() {
  try {
    const resp = await fetch('/api/state');
    if (!resp.ok) return;
    const s = await resp.json();
    renderServerWarnings(s.server_warnings);
    // `/api/state` exposes the live roster under `containers` (each entry an
    // object carrying `.name` + `.running`); there is no top-level `agents`
    // field, so the picker stays compatible with both string + object shapes.
    const containers = (s.containers || [])
      .map((a) => (typeof a === 'string' ? { name: a } : a))
      .filter((c) => c && c.name);
    agents = containers.map((c) => c.name).sort();
    containerRunning.clear();
    for (const c of containers) containerRunning.set(c.name, !!c.running);
  } catch {
    // best-effort: on a failed state read the picker renders empty
    // ("— no agents —") and the submit guard blocks until an agent is
    // selected, rather than guessing a roster.
  }
}

function renderAgentPicker() {
  const sel = $('ma-agent');
  sel.replaceChildren();
  if (!agents.length) {
    sel.append(el('option', { value: '' }, '— no agents —'));
    return;
  }
  sel.append(el('option', { value: '' }, '— select agent —'));
  for (const a of agents) sel.append(el('option', { value: a }, a));
}

async function loadAccounts(agent) {
  const list = $('ma-list');
  if (!agent) {
    list.replaceChildren(el('p', { class: 'meta' }, 'select an agent to see its matrix accounts.'));
    return;
  }
  list.replaceChildren(el('p', { class: 'meta' }, 'loading…'));
  let data;
  try {
    const resp = await fetch('/api/matrix-accounts?agent=' + encodeURIComponent(agent));
    if (!resp.ok) throw new Error('HTTP ' + resp.status);
    data = await resp.json();
  } catch (err) {
    list.replaceChildren(el('p', { class: 'err' },
      'could not load accounts: ' + esc(String(err)) + ' (the backend endpoint may not be deployed yet).'));
    return;
  }
  const accounts = data.accounts || [];
  const asOf = typeof data.as_of_unix === 'number' ? data.as_of_unix : null;
  // `false` only when the container is explicitly down; `undefined` (unknown,
  // e.g. a failed /api/state read) is treated as not-down so we never flag a
  // false stale.
  const running = containerRunning.get(agent);
  // The daemon force-rewrites its snapshot every ~30s, so `as_of_unix` advances
  // while it's alive — this is a heartbeat, and a stalled value is meaningful.
  const ageSecs = asOf != null
    ? Math.max(0, Math.floor(Date.now() / 1000) - asOf)
    : null;
  const asOfText = asOf != null
    ? 'matrix snapshot · live as of ' + fmtAgeSecs(ageSecs) + ' ago'
    : 'no daemon snapshot yet';
  // 3 missed ~30s heartbeats. Past this a `live` snapshot whose container is
  // NOT down means the daemon stopped publishing (dead/wedged) — dim its dot.
  const STALE_AGE_SECS = 90;
  const staleByAge = ageSecs != null && ageSecs > STALE_AGE_SECS;
  list.replaceChildren();
  if (!accounts.length) {
    list.append(el('p', { class: 'meta' }, 'no matrix accounts configured for this agent.'));
    return;
  }
  const ul = el('ul', { class: 'ma-accounts' });
  for (const acc of accounts) {
    const present = !!acc.token_present;
    // 3-state dot. `live` is absent on the v1 backend (pre BE-4); when
    // undefined, fall back to the v1 token-present rendering so the page
    // degrades cleanly before the snapshot backend deploys.
    let cls; let statusText; let dotTitle;
    if (acc.live === undefined) {
      cls = present ? 'ok' : 'absent';
      statusText = present ? 'token stored ✓' : 'no token';
      dotTitle = present ? 'token stored' : 'no token yet';
    } else if (acc.live && running === false) {
      // container down ⟹ daemon down ⟹ a "live" snapshot is stale.
      cls = 'stale';
      statusText = 'container stopped';
      dotTitle = 'container is stopped — live status is stale. ' + asOfText;
    } else if (acc.live && staleByAge) {
      // Snapshot says live, but the heartbeat (snapshot mtime = as_of) hasn't
      // advanced in > ~90s while the container is NOT down — the daemon stopped
      // publishing, so the "live" is no longer trustworthy. Keep the green
      // family but dim it (distinct from the amber container-down 'stale').
      cls = 'live stale-age';
      statusText = 'online · no heartbeat';
      dotTitle = 'snapshot says live but the daemon heartbeat stalled '
        + fmtAgeSecs(ageSecs) + ' ago (publishes every ~30s) — likely dead or wedged. '
        + asOfText;
    } else if (acc.live) {
      cls = 'live';
      statusText = 'online ✓';
      dotTitle = asOfText;
    } else if (present) {
      cls = 'offline';
      statusText = 'token stored · offline';
      dotTitle = 'provisioned but not live. ' + asOfText;
    } else {
      cls = 'absent';
      statusText = 'no token';
      dotTitle = 'no token yet';
    }
    ul.append(el('li', { class: 'ma-account' },
      el('span', { class: 'ma-dot ' + cls, title: dotTitle }),
      el('span', { class: 'ma-name' }, acc.name || '(unnamed)'),
      acc.user_id ? el('span', { class: 'ma-uid' }, acc.user_id) : null,
      el('span', { class: 'ma-hs' }, acc.homeserver || '—'),
      el('span', { class: 'ma-status ' + cls, title: asOfText }, statusText),
    ));
  }
  list.append(ul);
}

// Show only the fields for the selected login method, and DISABLE the
// hidden section's inputs so they don't ride along in the FormData (both
// sections carry a `user_id` field, so without this the wrong one — or
// both — would be submitted).
function toggleModeFields() {
  const mode = document.querySelector('input[name="mode"]:checked');
  const value = mode ? mode.value : 'password';
  const pw = $('ma-pw-fields');
  const tok = $('ma-token-fields');
  pw.hidden = value !== 'password';
  tok.hidden = value !== 'token';
  pw.querySelectorAll('input').forEach((i) => { i.disabled = pw.hidden; });
  tok.querySelectorAll('input').forEach((i) => { i.disabled = tok.hidden; });
}

function clearSecrets(formEl) {
  formEl.querySelectorAll('input[type="password"], input[name="token"]')
    .forEach((i) => { i.value = ''; });
}

async function submitLogin(e) {
  e.preventDefault();
  const formEl = e.target;
  const out = $('ma-result');
  out.className = 'ma-result';
  out.textContent = '';

  const agent = $('ma-agent').value;
  if (!agent) {
    out.className = 'ma-result err';
    out.textContent = 'select an agent first.';
    return;
  }

  const fd = new FormData(formEl);
  fd.set('agent', agent);

  const btn = formEl.querySelector('button[type="submit"]');
  const orig = btn.textContent;
  btn.disabled = true;
  btn.textContent = 'logging in…';

  try {
    const resp = await fetch('/api/matrix-account-login', {
      method: 'POST',
      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
      body: new URLSearchParams(fd),
    });

    if (resp.ok) {
      // Success is 200 + JSON { ok, user_id }.
      let body = {};
      try { body = await resp.json(); } catch { /* tolerate odd 2xx body */ }
      if (body.ok) {
        out.className = 'ma-result ok';
        out.textContent = '✓ logged in as ' + (body.user_id || '(unknown)') + ' — token stored.';
        clearSecrets(formEl);
        loadAccounts(agent);
      } else {
        out.className = 'ma-result err';
        out.textContent = '✗ login failed (unexpected response).';
        clearSecrets(formEl);
      }
    } else {
      // The BE error-body shape is in transition: today hive-c0re's
      // error_response sends a bare plain-text body (e.g. "matrix-account-
      // login: password mode needs user_id + password"); the RFC 9457 rework
      // moves it to application/problem+json ({ type, title, detail, … }).
      // Read shape-agnostically so the FE handles both with no merge-order
      // coupling: pull the body once as text, and if it parses as JSON
      // surface `detail` (problem+json) → `error`/`title` fallback, else use
      // the raw text. A bare HTTP code is the last resort.
      let msg = '';
      try {
        const raw = (await resp.text()).trim();
        msg = raw;
        if (raw && (raw[0] === '{' || raw[0] === '[')) {
          try {
            const body = JSON.parse(raw);
            msg = body.detail || body.error || body.title || raw;
          } catch { /* not JSON after all — keep the raw text */ }
        }
      } catch { /* fall back to the status code below */ }
      out.className = 'ma-result err';
      out.textContent = '✗ ' + (msg || ('login failed (HTTP ' + resp.status + ')'));
      clearSecrets(formEl);
    }
  } catch (err) {
    out.className = 'ma-result err';
    out.textContent = '✗ request failed: ' + String(err) + ' (the backend endpoint may not be deployed yet).';
  } finally {
    btn.disabled = false;
    btn.textContent = orig;
  }
}

async function init() {
  await loadState();
  renderAgentPicker();
  $('ma-agent').addEventListener('change', (e) => loadAccounts(e.target.value));
  document.querySelectorAll('input[name="mode"]')
    .forEach((r) => r.addEventListener('change', toggleModeFields));
  toggleModeFields();
  $('ma-form').addEventListener('submit', submitLogin);
  loadAccounts('');
}

init();