// The read-only account console (DESIGN-theseus-id.md §11.3). Theseus signs a
// Theseus ID sign-in for project "pithos" on this origin; the gateway answers
// with a "console" session that sees /hosted/v1/me and nothing else.

const $ = (id) => document.getElementById(id);
const KEY = 'pithos-console-token';
const store = {
  get() { try { return sessionStorage.getItem(KEY); } catch { return null; } },
  set(v) { try { if (v) sessionStorage.setItem(KEY, v); else sessionStorage.removeItem(KEY); } catch {} },
};

async function call(method, path, { body, token } = {}) {
  const res = await fetch(path, {
    method,
    headers: { ...(body ? { 'content-type': 'application/json' } : {}), ...(token ? { authorization: `Bearer ${token}` } : {}) },
    body: body ? JSON.stringify(body) : undefined,
  });
  const data = await res.json().catch(() => ({}));
  if (!res.ok) throw Object.assign(new Error(data.error || `HTTP ${res.status}`), { status: res.status });
  return data;
}

function say(text, error = false) {
  $('status').textContent = text || '';
  $('status').className = error ? 'error' : '';
}

const bytes = (n) => {
  if (!Number.isFinite(n)) return '—';
  const u = ['B', 'KB', 'MB', 'GB', 'TB'];
  let i = 0;
  while (n >= 1024 && i < u.length - 1) { n /= 1024; i++; }
  return `${n.toFixed(i ? 1 : 0)} ${u[i]}`;
};
const GATES = { bns: 'a BNS name', deposit: 'a deposit', invite: 'an invite code' };
const STATES = { empty: 'Ready, no drives moved in yet', active: 'Running', 'moving-out': 'Moving out', released: 'Released' };

function show(me) {
  const rows = [
    ['Account', me.id],
    ['Theseus ID', me.theseusId || '—'],
    ['State', STATES[me.state] || me.state],
    ['Opened', me.createdAt ? new Date(me.createdAt).toLocaleDateString() : '—'],
    ['Opened with', me.gate?.name ? `${GATES[me.gate.type] || me.gate.type} (${me.gate.name})` : (GATES[me.gate?.type] || '—')],
    ['Downloaded this month', me.downloadCapBytes ? `${bytes(me.usage?.down)} of ${bytes(me.downloadCapBytes)}` : bytes(me.usage?.down)],
    ['Uploaded this month', bytes(me.usage?.up)],
  ];
  $('facts').replaceChildren(...rows.flatMap(([k, v]) => {
    const dt = document.createElement('dt');
    dt.textContent = k;
    const dd = document.createElement('dd');
    dd.textContent = v;
    return [dt, dd];
  }));
  $('signed-out').hidden = true;
  $('signed-in').hidden = false;
}

function signedOut() {
  $('signed-in').hidden = true;
  $('signed-out').hidden = false;
  const inTheseus = !!window.theseusId;
  $('signin').hidden = !inTheseus;
  $('no-theseus').hidden = inTheseus;
}

async function refresh() {
  const token = store.get();
  if (!token) return signedOut();
  try {
    show(await call('GET', '/hosted/v1/me', { token }));
  } catch (e) {
    store.set(null);
    signedOut();
    if (e.status !== 401) say(e.message, true);
  }
}

const THESEUS_ERRORS = {
  denied: '',
  locked: 'Unlock your Theseus Vault, then try again.',
  'no-vault': 'Set up the Theseus Vault to get a Theseus ID.',
  'origin-not-listed': 'Theseus does not list this page as part of Pithos, so it will not sign in here.',
};

$('signin').addEventListener('click', async () => {
  $('signin').disabled = true;
  say('Signing in…');
  try {
    const { projectId, nonce } = await call('GET', '/hosted/v1/theseus-id/challenge');
    const signed = await window.theseusId.signIn({ projectId, nonce });
    const s = await call('POST', '/hosted/v1/console/session', { body: { message: signed.message, signature: signed.signature, move: signed.move } });
    if (signed.move && s.moved && window.theseusId.moved) await window.theseusId.moved({ projectId, account: signed.account }).catch(() => {});
    store.set(s.token);
    say('');
    await refresh();
  } catch (e) {
    say(e.code in THESEUS_ERRORS ? THESEUS_ERRORS[e.code] : e.message, true);
  } finally {
    $('signin').disabled = false;
  }
});

$('signout').addEventListener('click', async () => {
  const token = store.get();
  store.set(null);
  if (token) await call('DELETE', '/hosted/v1/session', { token }).catch(() => {});
  signedOut();
});

refresh();