// CR3D3NTIALS page entry (/credentials.html).
//
// Operator surface to provision per-agent credentials without editing the
// agent's config repo. Two sub-tabs, sharing one agent picker:
//   MATRIX — external matrix account login (carried over verbatim from the
//            old /matrix-accounts.html — see matrix_accounts.rs backend doc
//            comments for the account/status contract + endpoint shapes).
//   GITHUB — single-account PAT paste against /api/github-account
//            (GET -> {present}, POST form-encoded {agent, token} ->
//            {ok:true}; same error_response shape as matrix-account-login).
//            No account name / homeserver / login mode, and no
//            live/heartbeat concept for a static PAT — just present/absent.
//   FORGES — external forge accounts, entirely dashboard-provisioned (no
//            host-side config): GET /api/extra-forges?agent= lists the
//            agent's stored {label, base_url} pairs, POST
//            /api/extra-forge-account (form agent/label/base_url/token/
//            action=add|remove) stores or removes one. No remote account
//            creation — the operator makes the token on the external forge
//            themselves and pastes it in, same trust model as GITHUB.
// Per-tab detail comments live next to their section below.

import { $, el, esc, fmtAgeSecs, renderServerWarnings } from './common.js';
import { createTabStrip } from '@hive/shared/tabs.js';
import { themedConfirm, themedToast } from './modal.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));
}

// ─── shape-agnostic error-body parsing (shared by both tabs' submit
// handlers) ───────────────────────────────────────────────────────────────
// The BE error-body shape is in transition: today hive-c0re's
// error_response sends a bare plain-text body; the RFC 9457 rework moves it
// to application/problem+json ({ type, title, detail, … }). Read shape-
// agnostically: 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.
async function readErrorBody(resp) {
  try {
    const raw = (await resp.text()).trim();
    if (raw && (raw[0] === '{' || raw[0] === '[')) {
      try {
        const body = JSON.parse(raw);
        return body.detail || body.error || body.title || raw;
      } catch { /* not JSON after all — keep the raw text */ }
    }
    return raw;
  } catch {
    return '';
  }
}

// ─── MATRIX tab ────────────────────────────────────────────────────────────
// 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.

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 {
      const msg = await readErrorBody(resp);
      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;
  }
}

// ─── GITHUB tab ─────────────────────────────────────────────────────────

async function loadGithubStatus(agent) {
  const status = $('gh-status');
  if (!agent) {
    status.replaceChildren(el('p', { class: 'meta' }, 'select an agent to see its github credential status.'));
    return;
  }
  status.replaceChildren(el('p', { class: 'meta' }, 'loading…'));
  let data;
  try {
    const resp = await fetch('/api/github-account?agent=' + encodeURIComponent(agent));
    if (!resp.ok) throw new Error('HTTP ' + resp.status);
    data = await resp.json();
  } catch (err) {
    status.replaceChildren(el('p', { class: 'err' },
      'could not load status: ' + esc(String(err)) + ' (the backend endpoint may not be deployed yet).'));
    return;
  }
  const present = !!data.present;
  status.replaceChildren(el('div', { class: 'gh-status-line' },
    el('span', { class: 'gh-dot ' + (present ? 'present' : 'absent') }),
    el('span', { class: 'gh-status-text ' + (present ? 'present' : 'absent') },
      present ? 'token stored ✓' : 'not set'),
  ));
}

async function submitGithub(e) {
  e.preventDefault();
  const formEl = e.target;
  const out = $('gh-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 = 'storing…';

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

    if (resp.ok) {
      let body = {};
      try { body = await resp.json(); } catch { /* tolerate odd 2xx body */ }
      if (body.ok) {
        out.className = 'ma-result ok';
        out.textContent = '✓ token stored.';
        clearSecrets(formEl);
        loadGithubStatus(agent);
      } else {
        out.className = 'ma-result err';
        out.textContent = '✗ store failed (unexpected response).';
        clearSecrets(formEl);
      }
    } else {
      const msg = await readErrorBody(resp);
      out.className = 'ma-result err';
      out.textContent = '✗ ' + (msg || ('store 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;
  }
}

// ─── FORGES tab ─────────────────────────────────────────────────────────
// Entirely dashboard-provisioned, no host-side nix config: per-agent list
// (GET /api/extra-forges?agent=, derived from the agent's own
// forge-<label>-token files) + an add form (POST /api/extra-forge-account,
// form label/base_url/token, action=add) and a remove button per row
// (same POST, action=remove). No remote account creation — purely local
// bookkeeping for a token the operator already created on the external
// forge themselves.

async function loadForgeAccounts(agent) {
  const list = $('ef-list');
  if (!agent) {
    list.replaceChildren(el('p', { class: 'meta' }, 'select an agent to see its forge accounts.'));
    return;
  }
  list.replaceChildren(el('p', { class: 'meta' }, 'loading…'));
  let forges;
  try {
    const resp = await fetch('/api/extra-forges?agent=' + encodeURIComponent(agent));
    if (!resp.ok) throw new Error('HTTP ' + resp.status);
    forges = (await resp.json()).forges || [];
  } catch (err) {
    list.replaceChildren(el('p', { class: 'err' },
      'could not load forge accounts: ' + esc(String(err)) + ' (the backend endpoint may not be deployed yet).'));
    return;
  }

  list.replaceChildren();
  if (!forges.length) {
    list.replaceChildren(el('p', { class: 'meta' }, 'no forge accounts stored for this agent.'));
    return;
  }
  const ul = el('ul', { class: 'ma-accounts' });
  for (const forge of forges) {
    const btn = el('button', { class: 'btn', type: 'button' }, 'remove');
    btn.addEventListener('click', () => onForgeRemoveClick(agent, forge, btn));
    ul.append(el('li', { class: 'ma-account' },
      el('span', { class: 'ma-dot ok' }),
      el('span', { class: 'ma-name' }, forge.label),
      el('span', { class: 'ma-hs' }, forge.base_url || '—'),
      el('span', { class: 'ma-status ok' }, 'token stored ✓'),
      btn,
    ));
  }
  list.append(ul);
}

async function onForgeRemoveClick(agent, forge, btn) {
  const r = await themedConfirm({
    message: `remove ${agent}'s stored token for ${forge.label}? this only deletes the local copy — nothing changes on the remote forge.`,
    danger: true,
    confirmLabel: '⊘ remove',
  });
  if (!r) return;

  btn.disabled = true;
  const orig = btn.textContent;
  btn.textContent = 'removing…';
  try {
    const resp = await fetch('/api/extra-forge-account', {
      method: 'POST',
      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
      body: new URLSearchParams({ agent, label: forge.label, action: 'remove' }),
    });
    if (resp.ok) {
      loadForgeAccounts(agent);
      return;
    }
    const msg = await readErrorBody(resp);
    btn.textContent = orig;
    btn.disabled = false;
    themedToast('✗ ' + (msg || ('remove failed (HTTP ' + resp.status + ')')), { type: 'error' });
  } catch (err) {
    btn.textContent = orig;
    btn.disabled = false;
    themedToast('✗ request failed: ' + String(err), { type: 'error' });
  }
}

async function submitForgeAccount(e) {
  e.preventDefault();
  const formEl = e.target;
  const out = $('ef-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);
  fd.set('action', 'add');

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

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

    if (resp.ok) {
      let body = {};
      try { body = await resp.json(); } catch { /* tolerate odd 2xx body */ }
      if (body.ok) {
        out.className = 'ma-result ok';
        out.textContent = '✓ forge account stored.';
        clearSecrets(formEl);
        loadForgeAccounts(agent);
      } else {
        out.className = 'ma-result err';
        out.textContent = '✗ store failed (unexpected response).';
        clearSecrets(formEl);
      }
    } else {
      const msg = await readErrorBody(resp);
      out.className = 'ma-result err';
      out.textContent = '✗ ' + (msg || ('store 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;
  }
}

// ─── init ─────────────────────────────────────────────────────────────

async function onAgentChange(agent) {
  loadAccounts(agent);
  loadGithubStatus(agent);
  loadForgeAccounts(agent);
}

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

  createTabStrip(document.getElementById('cred-tabbar'), {
    defaultId: 'matrix',
  });

  onAgentChange('');
}

init();