// Per-agent web UI. Renders title + login/online view from `/api/state`,
// tails `/events/stream` for live claude events, drives async-form
// actions (send / login/* / dashboard rebuild).

(() => {
  // ─── helpers ────────────────────────────────────────────────────────────
  const $ = (id) => document.getElementById(id);
  const escText = (s) => String(s).replace(/[&<>"]/g, (c) =>
    ({ '&':'&amp;', '<':'&lt;', '>':'&gt;', '"':'&quot;' }[c])
  );
  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 e.setAttribute(k, v);
    }
    for (const c of children) {
      if (c == null) continue;
      e.append(c.nodeType ? c : document.createTextNode(c));
    }
    return e;
  };

  // ─── async-form submit (shared with dashboard) ──────────────────────────
  document.addEventListener('submit', async (e) => {
    const f = e.target;
    if (!(f instanceof HTMLFormElement) || !f.hasAttribute('data-async')) return;
    e.preventDefault();
    if (f.dataset.confirm && !confirm(f.dataset.confirm)) return;
    const btn = f.querySelector('button[type="submit"], button:not([type])');
    const original = btn ? btn.innerHTML : '';
    if (btn) { btn.disabled = true; btn.innerHTML = '<span class="spinner">◐</span>'; }
    try {
      const resp = await fetch(f.action, {
        method: f.method || 'POST',
        headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
        body: new URLSearchParams(new FormData(f)),
        redirect: 'manual',
      });
      const ok = resp.ok || resp.type === 'opaqueredirect'
        || (resp.status >= 200 && resp.status < 400);
      if (!ok) {
        const text = await resp.text().catch(() => '');
        alert('action failed: ' + resp.status + (text ? '\n\n' + text : ''));
        if (btn) { btn.disabled = false; btn.innerHTML = original; }
        return;
      }
      // Clear text inputs the operator typed into (the form value was sent).
      f.querySelectorAll('input[type="text"], input:not([type]), textarea').forEach((i) => { i.value = ''; });
      // Re-enable the button — refreshState() often skips re-rendering the
      // form (status unchanged), so without this the spinner sticks and
      // the operator can't submit again.
      if (btn) { btn.disabled = false; btn.innerHTML = original; }
      refreshState();
    } catch (err) {
      alert('action failed: ' + err);
      if (btn) { btn.disabled = false; btn.innerHTML = original; }
    }
  });

  // ─── state rendering ────────────────────────────────────────────────────
  function setHeader(label, dashboardPort) {
    $('banner').textContent =
      `░▒▓█▓▒░  ${label}  ░▒▓█▓▒░  hyperhive ag3nt  ░▒▓█▓▒░`;
    const title = $('title');
    title.textContent = `◆ ${label} ◆ `;
    const btn = el('a', {
      href: '#', class: 'btn-rebuild', id: 'rebuild-btn',
    }, '↻ R3BU1LD');
    btn.addEventListener('click', (e) => {
      e.preventDefault();
      if (!confirm(`rebuild ${label}? container will hot-reload.`)) return;
      const url = `${location.protocol}//${location.hostname}:${dashboardPort}/rebuild/${label}`;
      const f = document.createElement('form');
      f.method = 'POST';
      f.action = url;
      document.body.appendChild(f);
      f.submit();
    });
    title.append(btn);
    document.title = `${label} // hyperhive`;
  }

  function renderOnline(_label, root) {
    root.append(
      el('p', { class: 'status-online' }, '● harness alive — turn loop running'),
    );
  }

  function renderNeedsLoginIdle(root) {
    root.append(
      el('p', { class: 'status-needs-login' }, '◌ NEEDS L0G1N'),
      el('p', { html:
        'No Claude session in <code>~/.claude/</code>. The harness is up but the turn loop is paused until you log in.',
      }),
    );
    const start = el('form', {
      action: '/login/start', method: 'POST', 'data-async': '',
    });
    start.append(
      el('button', { type: 'submit', class: 'btn btn-login' }, '◆ ST4RT L0G1N'),
    );
    root.append(start);
    root.append(el('p', { class: 'meta', html:
      'Spawns <code>claude auth login</code> over plain stdio pipes. The OAuth URL will appear here when claude emits it; paste the resulting code back into the form below.',
    }));
  }

  function renderLoginInProgress(s, root) {
    root.append(el('p', { class: 'status-needs-login' }, '◌ L0G1N 1N PR0GRESS'));
    if (s.url) {
      const link = el('a', {
        href: s.url, target: '_blank', rel: 'noreferrer',
      }, s.url);
      root.append(el('p', {}, '▶ ', link));
      root.append(el('p', { class: 'meta' },
        'open this URL in a browser, complete the OAuth flow, paste the resulting code below.',
      ));
    } else {
      root.append(el('p', { class: 'meta' },
        'waiting for claude to emit an OAuth URL on stdout… (output below)',
      ));
    }
    if (!s.finished) {
      const code = el('form', {
        action: '/login/code', method: 'POST', class: 'loginform', 'data-async': '',
      });
      code.append(
        el('input', {
          name: 'code', placeholder: 'paste OAuth code here',
          required: '', autocomplete: 'off',
        }),
        el('button', { type: 'submit', class: 'btn btn-login' }, '◆ S3ND C0DE'),
      );
      root.append(code);
    }
    const cancel = el('form', {
      action: '/login/cancel', method: 'POST', 'data-async': '',
      style: 'margin-top: 0.4em;',
    });
    cancel.append(el('button', { type: 'submit', class: 'btn btn-cancel' }, 'cancel + kill'));
    root.append(cancel);
    if (s.finished) {
      root.append(el('p', { class: 'status-needs-login' },
        `claude process exited: ${s.exit_note || 'exited'}. Start over if needed.`,
      ));
    }
    root.append(el('h3', {}, 'output'));
    root.append(el('pre', { class: 'diff' }, s.output || ''));
  }

  let headerSet = false;
  let lastStatus = null;
  let lastOutputLen = -1;
  let pollTimer = null;
  let termInputRendered = false;

  function renderTermInput(label, online) {
    const slot = $('term-input');
    if (!slot) return;
    if (!termInputRendered) {
      slot.innerHTML = '';
      const form = el('form', {
        action: '/send', method: 'POST',
        class: 'sendform-term', 'data-async': '',
      });
      const ta = el('textarea', {
        name: 'body', placeholder: 'message ' + label + '…',
        required: '', autocomplete: 'off', rows: '1',
      });
      // Enter submits, Shift+Enter inserts a newline. Auto-grow up to
      // ~8 rows of content, then scroll inside the textarea.
      const MAX_PX = 12 * 16; // ~8 lines @ 1.5 line-height, 1em base
      const grow = () => {
        ta.style.height = 'auto';
        ta.style.height = Math.min(ta.scrollHeight, MAX_PX) + 'px';
      };
      ta.addEventListener('input', grow);
      ta.addEventListener('keydown', (e) => {
        if (e.key === 'Enter' && !e.shiftKey && !e.isComposing) {
          e.preventDefault();
          if (ta.value.trim()) form.requestSubmit();
        }
      });
      // Reset height after async submit clears the value.
      form.addEventListener('submit', () => setTimeout(grow, 0));
      form.append(
        el('span', { class: 'prompt' }, 'operator@' + label + ' ▸'),
        ta,
        el('span', { class: 'submit-hint' }, '↵ send · ⇧↵ newline'),
      );
      slot.append(form);
      termInputRendered = true;
    }
    slot.classList.toggle('disabled', !online);
    const ta = slot.querySelector('textarea');
    if (ta) ta.disabled = !online;
  }

  // Track banner activity by reference-counting in-flight turns. A turn
  // can begin while the previous turn_end is still in the pipeline (rare
  // but happens on tight wake cycles), so we count rather than toggle.
  let activeTurns = 0;
  function setBannerActive(on) {
    const banner = $('banner');
    if (!banner) return;
    if (on) {
      activeTurns += 1;
      banner.classList.add('active');
    } else {
      activeTurns = Math.max(0, activeTurns - 1);
      if (activeTurns === 0) banner.classList.remove('active');
    }
  }

  async function refreshState() {
    try {
      const resp = await fetch('/api/state');
      if (!resp.ok) throw new Error('http ' + resp.status);
      const s = await resp.json();
      if (!headerSet) { setHeader(s.label, s.dashboard_port); headerSet = true; }
      renderTermInput(s.label, s.status === 'online');
      // Skip the re-render if nothing structurally changed. The most
      // common case is `online` polling itself — without this guard, the
      // operator's <input value> gets clobbered every cycle.
      const outLen = s.session?.output?.length ?? -1;
      const dirty =
        s.status !== lastStatus ||
        (s.status === 'needs_login_in_progress' && outLen !== lastOutputLen);
      if (dirty) {
        const root = $('status');
        root.innerHTML = '';
        if (s.status === 'online') renderOnline(s.label, root);
        else if (s.status === 'needs_login_idle') renderNeedsLoginIdle(root);
        else if (s.status === 'needs_login_in_progress') renderLoginInProgress(s.session || {}, root);
        lastStatus = s.status;
        lastOutputLen = outLen;
      }
      // Only poll while a login is in flight — otherwise SSE turn_end
      // events trigger a refresh, and the operator can type into the
      // send form without it getting cleared every few seconds.
      if (pollTimer) { clearTimeout(pollTimer); pollTimer = null; }
      if (s.status === 'needs_login_in_progress') {
        pollTimer = setTimeout(refreshState, 1500);
      }
    } catch (err) {
      console.error('refreshState failed', err);
      pollTimer = setTimeout(refreshState, 5000);
    }
  }
  refreshState();

  // ─── live event stream ──────────────────────────────────────────────────
  (function() {
    const log = $('live');
    if (!log) return;
    let placeholder = log.firstChild;
    function setPlaceholder(text) {
      log.innerHTML = '';
      const span = document.createElement('div');
      span.className = 'meta';
      span.textContent = text;
      log.appendChild(span);
      placeholder = span;
    }
    function clearPlaceholder() {
      if (placeholder) { log.innerHTML = ''; placeholder = null; }
    }
    // Backfill replays mark rows .no-anim so we don't stagger 100 fade-ins
    // on page load. Set via `currentNoAnim` before the row helpers fire.
    let currentNoAnim = false;
    function row(cls, text) {
      clearPlaceholder();
      const e = document.createElement('div');
      e.className = 'row ' + (cls || '') + (currentNoAnim ? ' no-anim' : '');
      e.textContent = text;
      log.appendChild(e);
      log.scrollTop = log.scrollHeight;
      return e;
    }
    function details(cls, summary, body) {
      clearPlaceholder();
      const d = document.createElement('details');
      d.className = 'row ' + (cls || '') + (currentNoAnim ? ' no-anim' : '');
      const s = document.createElement('summary');
      s.textContent = summary;
      d.appendChild(s);
      const pre = document.createElement('pre');
      pre.className = 'tool-body';
      pre.textContent = body;
      d.appendChild(pre);
      log.appendChild(d);
      log.scrollTop = log.scrollHeight;
      return d;
    }
    function trim(s, n) { return s.length > n ? s.slice(0, n) + '…' : s; }
    // Pretty-print a tool call: per-known-tool format, fallback to JSON
    // for unknown tools.
    function fmtToolUse(c) {
      const name = c.name || '';
      const input = c.input || {};
      const short = name.startsWith('mcp__hyperhive__')
        ? name.slice('mcp__hyperhive__'.length) + '*' : name;
      switch (name) {
        case 'Read':       return short + ' ' + (input.file_path || '');
        case 'Write':      return short + ' ' + (input.file_path || '');
        case 'Edit':       return short + ' ' + (input.file_path || '');
        case 'Glob':       return short + ' ' + (input.pattern || '');
        case 'Grep':       return short + ' ' + (input.pattern || '');
        case 'Bash':       return short + ' $ ' + (input.command || '');
        case 'TodoWrite':  return short + ' (' + ((input.todos || []).length) + ' items)';
        case 'mcp__hyperhive__send': return short + ' → ' + (input.to || '?') + ': '
          + JSON.stringify(input.body || '').slice(0, 80);
        case 'mcp__hyperhive__recv': return short + '()';
        case 'mcp__hyperhive__request_spawn': return short + ' ' + (input.name || '');
        case 'mcp__hyperhive__kill':          return short + ' ' + (input.name || '');
        case 'mcp__hyperhive__request_apply_commit':
          return short + ' ' + (input.agent || '') + ' @ ' + (input.commit_ref || '').slice(0, 12);
        default: return name + ' ' + trim(JSON.stringify(input), 200);
      }
    }
    function renderToolResult(c) {
      const txt = Array.isArray(c.content)
        ? c.content.map(p => p.text || '').join('')
        : (c.content || '');
      const summary = '←  ' + (() => {
        const trimmed = txt.replace(/\s+/g, ' ').trim();
        if (!trimmed) return '(empty)';
        if (trimmed.length <= 120) return trimmed;
        const lines = txt.split('\n').filter(l => l.length).length;
        const headline = trimmed.slice(0, 90) + '…';
        return `${lines}L · ${headline}`;
      })();
      // For empty / short results, render as a flat row (no expand).
      if (!txt.trim() || txt.length <= 120) {
        row('tool-result', summary);
      } else {
        details('tool-result-block', summary, txt);
      }
    }
    function renderStream(v) {
      // Drop session init, claude's result line, rate-limit — they're
      // noise. TurnEnd communicates pass/fail; session init data isn't
      // actionable.
      if (v.type === 'system' && v.subtype === 'init') return;
      if (v.type === 'rate_limit_event') return;
      if (v.type === 'result') return;
      if (v.type === 'assistant' && v.message && v.message.content) {
        for (const c of v.message.content) {
          if (c.type === 'text' && c.text && c.text.trim()) row('text', c.text);
          else if (c.type === 'thinking') {
            const txt = (c.thinking || c.text || '').trim();
            row('thinking', txt ? '· ' + txt : '· thinking …');
          }
          else if (c.type === 'tool_use') row('tool-use', '→  ' + fmtToolUse(c));
        }
        return;
      }
      if (v.type === 'user' && v.message && v.message.content) {
        for (const c of v.message.content) {
          if (c.type === 'tool_result') renderToolResult(c);
        }
        return;
      }
      row('sys', '· ' + trim(JSON.stringify(v), 200));
    }
    function handle(ev, opts) {
      const fromHistory = !!(opts && opts.fromHistory);
      if (ev.kind === 'turn_start') {
        if (!fromHistory) setBannerActive(true);
        const block = row('turn-start', '◆ TURN ← ' + ev.from);
        if (ev.unread > 0) {
          const badge = document.createElement('span');
          badge.className = 'unread-badge';
          badge.textContent = '· ' + ev.unread + ' unread';
          block.appendChild(badge);
        }
        const body = document.createElement('div');
        body.className = 'turn-body';
        body.textContent = ev.body;
        block.appendChild(body);
        return;
      }
      if (ev.kind === 'turn_end') {
        if (!fromHistory) setBannerActive(false);
        const cls = ev.ok ? 'turn-end-ok' : 'turn-end-fail';
        row(cls, (ev.ok ? '✓' : '✗') + ' turn ' + (ev.ok ? 'ok' : 'fail') + (ev.note ? ' — ' + ev.note : ''));
        // Login may have just landed (or session re-enters Online). Pull
        // fresh state so the form view reflects it.
        if (!fromHistory) refreshState();
        return;
      }
      if (ev.kind === 'note') {
        row('note', '· ' + ev.text);
        return;
      }
      if (ev.kind === 'stream') {
        const v = Object.assign({}, ev); delete v.kind;
        renderStream(v);
        return;
      }
      row('note', JSON.stringify(ev));
    }

    // Backfill the last N events before subscribing live. Walk through
    // turn_start/turn_end to leave the banner-active counter in the right
    // state: if the history's last turn never closed, we *do* want the
    // banner shimmer to be on. fromHistory=true on the replay; we apply
    // the final activity state in one pass at the end.
    async function backfill() {
      try {
        const resp = await fetch('/events/history');
        if (!resp.ok) return;
        const events = await resp.json();
        let openTurns = 0;
        currentNoAnim = true;
        for (const ev of events) {
          handle(ev, { fromHistory: true });
          if (ev.kind === 'turn_start') openTurns += 1;
          else if (ev.kind === 'turn_end') openTurns = Math.max(0, openTurns - 1);
        }
        currentNoAnim = false;
        for (let i = 0; i < openTurns; i++) setBannerActive(true);
        if (events.length) row('note', '─── live (older above) ───');
        else setPlaceholder('(connected — waiting for events)');
      } catch (err) {
        // Best effort; SSE will catch up.
        console.warn('history backfill failed', err);
      }
    }

    backfill().then(() => {
      const es = new EventSource('/events/stream');
      es.onopen = () => { /* no placeholder — backfill already painted */ };
      es.onmessage = (e) => {
        try { handle(JSON.parse(e.data)); }
        catch (err) { row('note', '[parse err] ' + e.data); }
      };
      es.onerror = () => {
        if (es.readyState === EventSource.CONNECTING) row('note', '[reconnecting…]');
        else row('note', '[disconnected]');
      };
    });
  })();

  // Avoid unused-var lint while keeping `escText` available for future use.
  void escText;
})();