// BU1LDS page entry (/builds.html). The build lifecycle hub — rebuild
// queue, live build log, meta inputs, and build log history on one page.
// Three sub-tabs via the shared createTabStrip (default = Rebuild Queue):
//   - R3BU1LD QU3U3: pending + running rebuilds + live build log inline
//   - M3T4 1NPUTS:   nix flake input selector + meta-update trigger
//   - BUILD L0GS:    all-agents build log history (lazy-loaded on tab show)
//
// Carved out of /core.html (rebuild queue + meta inputs) and /logs.html
// (BUILD tab) so the full build lifecycle is in one place. The section
// renderers here are direct copies from core.js / logs.js with only the
// deep-link URL and count-pill id adjusted.

import { $, el, fmtAgeSecs, openStream, openBuildLogStream, initServerWarnings, bindAsyncForms } from './common.js';
import { fmtAgo, fmtElapsed, fmtDuration, truncate } from './util.js';
import { createTabStrip } from '@hive/shared/tabs.js';

// ─── derived state ───────────────────────────────────────────────────────────
let metaInputsState = [];
let metaUpdateRunning = false;
let rebuildQueueState = [];

function syncFromSnapshot(s) {
  metaInputsState = (s.meta_inputs || []).slice();
  metaUpdateRunning = !!s.meta_update_running;
  rebuildQueueState = (s.rebuild_queue || []).slice();
}

// ─── meta inputs ─────────────────────────────────────────────────────────────
function renderMetaInputs(s) {
  const root = $('meta-inputs-section');
  if (!root) return;
  // Snapshot ticked checkboxes before wiping so a concurrent
  // MetaInputsChanged doesn't silently clear a pending selection.
  const checkedInputs = new Set(
    Array.from(root.querySelectorAll('input[type="checkbox"][data-meta-input]:checked'))
      .map((cb) => cb.dataset.metaInput),
  );
  root.replaceChildren();
  const inputs = s.meta_inputs || [];
  if (!inputs.length) {
    root.append(el('p', { class: 'empty' }, 'meta repo not seeded yet'));
    return;
  }
  if (metaUpdateRunning) {
    root.append(el('p', { class: 'meta-update-running' },
      '⏳ meta-update running — flake lock bump + affected agents rebuilding. '
      + 'watch the agent cards for per-rebuild progress.'));
  }
  const f = el('form', {
    method: 'POST',
    action: '/api/meta-update',
    class: 'meta-inputs-form',
    'data-async': '',
    'data-no-refresh': '',
    'data-confirm': 'update selected meta flake inputs + rebuild affected agents?',
  });
  const bulk = el('div', { class: 'meta-inputs-bulk' });
  const selAll = el('button', { type: 'button', class: 'meta-bulk-btn' }, 'select all');
  const selNone = el('button', { type: 'button', class: 'meta-bulk-btn' }, 'select none');
  bulk.append('bulk: ', selAll, ' ', selNone);
  f.append(bulk);
  const ul = el('ul', { class: 'meta-inputs' });
  for (const inp of inputs) {
    const depth = (inp.name.match(/\//g) || []).length;
    const leaf = inp.name.slice(inp.name.lastIndexOf('/') + 1);
    const li = el('li');
    if (depth > 0) li.style.marginLeft = (depth * 1.3) + 'em';
    const id = 'meta-input-' + inp.name.replace(/[^a-z0-9-]/gi, '_');
    const cb = el('input', {
      type: 'checkbox',
      name: 'meta_input_' + inp.name,
      id,
      value: inp.name,
      'data-meta-input': inp.name,
    });
    if (checkedInputs.has(inp.name)) cb.checked = true;
    const label = el('label', { for: id, title: inp.name });
    label.append(cb);
    if (depth > 0) label.append(el('span', { class: 'meta-input-twig' }, '└ '));
    label.append(
      el('span', { class: 'meta-input-name' }, leaf), ' ',
      el('code', { class: 'meta-input-rev' }, inp.rev.slice(0, 12)), ' ',
      el('span', { class: 'meta-input-ts' }, fmtAgo(inp.last_modified)),
    );
    if (inp.url) {
      label.append(' ', el('span', { class: 'meta-input-url', title: inp.url },
        '· ' + truncate(inp.url, 48)));
    }
    li.append(label);
    ul.append(li);
  }
  f.append(ul);
  const hidden = el('input', { type: 'hidden', name: 'inputs', value: '' });
  f.append(hidden);
  const btn = el('button', {
    type: 'submit',
    class: 'btn btn-meta-update',
    disabled: '',
  }, metaUpdateRunning ? '⏳ UPD4T1NG…' : '◆ UPD4TE & R3BU1LD');
  f.append(btn);
  function refreshDisabled() {
    const any = f.querySelectorAll('input[data-meta-input]:checked').length > 0;
    if (any && !metaUpdateRunning) btn.removeAttribute('disabled');
    else btn.setAttribute('disabled', '');
  }
  f.addEventListener('change', refreshDisabled);
  function setAllChecked(val) {
    for (const b of f.querySelectorAll('input[data-meta-input]')) b.checked = val;
    refreshDisabled();
  }
  selAll.addEventListener('click', () => setAllChecked(true));
  selNone.addEventListener('click', () => setAllChecked(false));
  f.addEventListener('submit', () => {
    const selected = Array.from(f.querySelectorAll('input[data-meta-input]:checked'))
      .map((b) => b.dataset.metaInput);
    hidden.value = selected.join(',');
  });
  root.append(f);
}

// ─── rebuild queue ────────────────────────────────────────────────────────────
const rebuildQueueRowCache = new Map();
const QUEUE_KIND_GLYPH = {
  rebuild: '↻',
  meta_update: '◆',
  spawn: '✨',
  destroy: '🗑',
  restart: '↺',
  startup_sweep: '⚡',
  perm_change: '🔑',
};
const QUEUE_STATE_GLYPH = {
  queued: '⏸',
  running: '▶',
  done: '✔',
  failed: '✖',
  cancelled: '⊘',
};

function rebuildQueueEntryFingerprint(entry, isChild) {
  return JSON.stringify({
    state: entry.state,
    step: entry.step,
    kind: entry.kind,
    agent: entry.agent,
    source: entry.source,
    started_at: entry.started_at,
    enqueued_at: entry.enqueued_at,
    finished_at: entry.finished_at,
    reason: entry.reason,
    error: entry.error,
    build_log_id: entry.build_log_id,
    isChild,
  });
}

function renderRebuildQueue(s) {
  const queue = s.rebuild_queue || [];
  renderRebuildLiveLog(queue);
  const root = $('rebuild-queue-section');
  if (!root) return;

  if (!queue.length) {
    rebuildQueueRowCache.clear();
    root.replaceChildren(el('p', { class: 'empty' }, 'queue is empty — nothing pending or in flight.'));
    return;
  }

  const byId = new Map(queue.map((e) => [e.id, e]));
  const tops = queue.filter((e) => e.parent_id == null);
  const childrenOf = new Map();
  for (const e of queue) {
    if (e.parent_id != null) {
      if (!childrenOf.has(e.parent_id)) childrenOf.set(e.parent_id, []);
      childrenOf.get(e.parent_id).push(e);
    }
  }
  const orphans = queue.filter((e) => e.parent_id != null && !byId.has(e.parent_id));

  const orderedLis = [];
  function addEntry(entry, isChild) {
    const fp = rebuildQueueEntryFingerprint(entry, isChild);
    const cached = rebuildQueueRowCache.get(entry.id);
    let li;
    if (cached && cached.fingerprint === fp) {
      li = cached.el;
    } else {
      li = renderQueueEntry(entry, byId, isChild);
      rebuildQueueRowCache.set(entry.id, { el: li, fingerprint: fp });
    }
    orderedLis.push(li);
  }
  for (const top of tops) {
    addEntry(top, false);
    for (const child of childrenOf.get(top.id) || []) addEntry(child, true);
  }
  for (const o of orphans) addEntry(o, true);

  const liveIds = new Set(queue.map((e) => e.id));
  for (const [id, entry] of rebuildQueueRowCache) {
    if (!liveIds.has(id)) {
      entry.el.remove();
      rebuildQueueRowCache.delete(id);
    }
  }

  let ul = root.querySelector('ul.rebuild-queue');
  if (!ul) {
    ul = el('ul', { class: 'rebuild-queue' });
    root.replaceChildren(ul);
  }
  for (let i = 0; i < orderedLis.length; i++) {
    if (ul.children[i] !== orderedLis[i]) {
      ul.insertBefore(orderedLis[i], ul.children[i] ?? null);
    }
  }
  while (ul.children.length > orderedLis.length) ul.lastChild.remove();
}

function renderQueueEntry(entry, _byId, isChild) {
  const li = el('li', {
    class: 'rebuild-queue-entry rqe-' + entry.state,
    'data-id': String(entry.id),
  });
  if (isChild) li.classList.add('rqe-child');
  li.append(
    el('span', { class: 'rqe-state', title: entry.state }, QUEUE_STATE_GLYPH[entry.state] || '?'),
    ' ',
    el('span', { class: 'rqe-kind', title: entry.kind },
      (QUEUE_KIND_GLYPH[entry.kind] || '?') + ' ' + entry.kind),
    ' ',
    el('code', { class: 'rqe-agent' }, entry.agent),
  );
  li.append(' ', el('span', { class: 'rqe-source rqe-source-' + entry.source }, entry.source));
  if (entry.state === 'queued') {
    li.append(' ', el('span', {
      class: 'rqe-when',
      'data-rqe-enqueued': String(entry.enqueued_at),
    }, '· queued ' + fmtAgo(entry.enqueued_at)));
  } else if (entry.state === 'running' && entry.started_at) {
    const elapsed = Math.max(0, Math.floor(Date.now() / 1000 - entry.started_at));
    li.append(' ', el('span', {
      class: 'rqe-when',
      'data-rqe-elapsed': String(entry.started_at),
    }, '· ' + fmtElapsed(elapsed)));
  } else if (entry.finished_at) {
    li.append(' ', el('span', {
      class: 'rqe-when',
      'data-rqe-finished': String(entry.finished_at),
      'data-rqe-state': entry.state,
    }, '· ' + entry.state + ' ' + fmtAgo(entry.finished_at)));
  }
  if (entry.reason) {
    const r = entry.reason.split('\n')[0];
    li.append(' ', el('span', { class: 'rqe-reason', title: entry.reason }, '— ' + truncate(r, 60)));
  }
  if (entry.step) {
    li.append(el('div', { class: 'rqe-step' }, '↳ ' + entry.step));
  }
  if (entry.build_log_id != null) {
    li.append(
      ' ',
      el('a', {
        class: 'rqe-log-link',
        href: '/builds.html?id=' + entry.build_log_id + '#buildlogs',
        target: '_blank',
        title: 'view build log #' + entry.build_log_id,
      }, 'logs →'),
    );
  }
  if (entry.error) {
    li.append(el('pre', { class: 'rqe-error', title: entry.error }, truncate(entry.error, 200)));
  }
  if (entry.state === 'queued') {
    const cancelForm = el('form', {
      method: 'POST',
      action: '/api/rebuild-queue/' + entry.id + '/cancel',
      class: 'inline rqe-cancel',
      'data-async': '',
      'data-confirm':
        `cancel ${entry.kind} for \`${entry.agent}\` (queue id ${entry.id})? ` +
        `the row drops from the queue and never runs. running / done / failed entries can't be cancelled this way.`,
    });
    cancelForm.append(el('button', {
      type: 'submit',
      class: 'rqe-cancel-btn',
      title: 'cancel this queued ' + entry.kind,
      'aria-label': 'cancel queued ' + entry.kind + ' for ' + entry.agent,
    }, '✗'));
    li.append(cancelForm);
  }
  return li;
}

// ─── running-rebuild live log ─────────────────────────────────────────────────
// One persistent live-log panel for the currently-running rebuild (the queue
// runs one build at a time). Keyed to the running entry's build_log_id and
// kept in its own container (#rebuild-live-log) so the queue's row re-render
// — which rebuilds rows as the build step advances — never tears down the open
// SSE stream.
let liveLogEs = null;
let liveLogId = null;
let liveLogDone = false;
let liveLogCollapsed = false;

function closeLiveLogStream() {
  if (liveLogEs) { liveLogEs.close(); liveLogEs = null; }
}

function renderRebuildLiveLog(queue) {
  const root = $('rebuild-live-log');
  if (!root) return;
  const running = (queue || []).find(
    (e) => e.state === 'running' && e.build_log_id != null);

  if (!running) {
    closeLiveLogStream();
    liveLogId = null;
    liveLogDone = false;
    if (!root.hidden) { root.hidden = true; root.replaceChildren(); }
    return;
  }
  if (running.build_log_id === liveLogId && (liveLogEs || liveLogDone)) return;

  closeLiveLogStream();
  liveLogId = running.build_log_id;
  liveLogDone = false;
  root.hidden = false;
  root.replaceChildren();

  const pre = el('pre', { class: 'rebuild-live-log-output' }, '');
  pre.hidden = liveLogCollapsed;
  const badge = el('span', { class: 'rebuild-live-log-badge rll-running' }, 'live');
  const toggle = el('button', {
    type: 'button',
    class: 'rebuild-live-log-toggle',
    'aria-expanded': String(!liveLogCollapsed),
    title: liveLogCollapsed ? 'expand live log' : 'collapse live log',
  }, liveLogCollapsed ? '▸' : '▾');
  toggle.addEventListener('click', () => {
    liveLogCollapsed = !liveLogCollapsed;
    pre.hidden = liveLogCollapsed;
    toggle.textContent = liveLogCollapsed ? '▸' : '▾';
    toggle.setAttribute('aria-expanded', String(!liveLogCollapsed));
    toggle.title = liveLogCollapsed ? 'expand live log' : 'collapse live log';
  });
  const header = el('div', { class: 'rebuild-live-log-header' },
    toggle, ' ',
    el('span', { class: 'rebuild-live-log-title' }, 'live build log — '),
    el('code', { class: 'rqe-agent' }, running.agent),
    ' ', el('span', { class: 'rqe-kind' }, running.kind || 'rebuild'),
    ' ', badge, ' ',
    el('a', {
      class: 'rebuild-live-log-raw',
      href: '/api/build-logs/id/' + running.build_log_id + '/raw',
      download: 'build-log-' + running.build_log_id + '.txt',
    }, '↓ raw'),
  );
  root.append(header, pre);

  liveLogEs = openBuildLogStream(running.build_log_id, pre, {
    onDone: (status) => {
      liveLogDone = true;
      badge.className = 'rebuild-live-log-badge ' + (status === 'ok' ? 'rll-ok' : 'rll-fail');
      badge.textContent = status;
      liveLogEs = null;
    },
    onError: () => {
      badge.className = 'rebuild-live-log-badge rll-fail';
      badge.textContent = 'stream error';
      liveLogEs = null;
    },
  });
}

// ─── rebuild-queue count pill ─────────────────────────────────────────────────
function updateRebuildCount() {
  const pill = $('builds-tab-count-rebuild');
  if (!pill) return;
  let n = 0;
  for (const e of rebuildQueueState) {
    if (e.state === 'queued' || e.state === 'running') n++;
  }
  if (n > 0) { pill.textContent = String(n); pill.hidden = false; }
  else { pill.hidden = true; }
}

// ─── render-all (cold load + any full re-render) ──────────────────────────────
function renderAll() {
  renderRebuildQueue({ rebuild_queue: rebuildQueueState });
  renderMetaInputs({ meta_inputs: metaInputsState });
  updateRebuildCount();
}

// ─── elapsed-time tickers ─────────────────────────────────────────────────────
setInterval(() => {
  const now = Math.floor(Date.now() / 1000);
  for (const span of document.querySelectorAll('.rqe-when[data-rqe-elapsed]')) {
    const started = parseInt(span.dataset.rqeElapsed, 10);
    if (!started) continue;
    span.textContent = '· ' + fmtElapsed(Math.max(0, now - started));
  }
}, 1000);
setInterval(() => {
  for (const span of document.querySelectorAll('.rqe-when[data-rqe-enqueued]')) {
    const enqueued = parseInt(span.dataset.rqeEnqueued, 10);
    if (!enqueued) continue;
    span.textContent = '· queued ' + fmtAgo(enqueued);
  }
  for (const span of document.querySelectorAll('.rqe-when[data-rqe-finished]')) {
    const finished = parseInt(span.dataset.rqeFinished, 10);
    if (!finished) continue;
    const state = span.dataset.rqeState || '';
    span.textContent = '· ' + state + ' ' + fmtAgo(finished);
  }
}, 30_000);

// ─── BUILD L0GS tab ───────────────────────────────────────────────────────────
// All-agents build log history with expand-to-detail. Live builds stream in
// real time. Lazy-loaded on first tab activation; auto-refreshes (debounced
// 2s) when rebuild_queue_changed fires while the BUILD L0GS tab is active.
// Deep-link: ?id=N#buildlogs auto-expands the target row.

const buildList    = $('build-list');
const buildRefresh = $('build-refresh');
let buildLogsLoaded = false;
let buildTabs; // set in init

function fmtTs(unixSecs) {
  if (!unixSecs) return '';
  const age = Math.floor(Date.now() / 1000) - unixSecs;
  return fmtAgeSecs(Math.max(0, age)) + ' ago';
}

async function fetchBuild() {
  if (!buildList) return;
  buildList.replaceChildren();
  buildList.append(el('p', { class: 'meta' }, 'loading…'));
  try {
    const resp = await fetch('/api/build-logs?limit=30');
    if (!resp.ok) throw new Error('http ' + resp.status);
    const rows = await resp.json();
    buildList.replaceChildren();
    if (!rows || rows.length === 0) {
      buildList.append(el('p', { class: 'meta' }, '(no build logs yet)'));
      return;
    }
    const ul = el('ul', { class: 'build-logs-list' });
    for (const h of rows) {
      const li = el('li', { class: 'build-logs-item', 'data-log-id': String(h.id) });
      const live = !h.status;
      const ok = h.status === 'ok';
      const statusClass = live ? 'badge badge-running' : ok ? 'badge badge-ok' : 'badge badge-fail';
      const statusLabel = live ? 'live' : ok ? 'ok' : 'fail';
      const age = h.finished_at ? fmtTs(h.finished_at) : (live ? '' : fmtTs(h.started_at));
      const runtime = h.runtime_secs != null
        ? el('span', { class: 'build-logs-runtime meta' }, fmtDuration(Math.max(0, h.runtime_secs)))
        : live
          ? el('span', { class: 'build-logs-runtime meta build-logs-live-dur' }, '…')
          : el('span', { class: 'build-logs-runtime meta' }, '');

      let durTimer = null;
      if (live && h.started_at) {
        const updateDur = () => {
          const elapsed = Math.floor(Date.now() / 1000) - h.started_at;
          runtime.textContent = fmtDuration(Math.max(0, elapsed));
        };
        updateDur();
        durTimer = setInterval(updateDur, 1000);
      }

      const rowBtn = el('button', {
        type: 'button',
        class: 'build-logs-row-btn',
        'aria-expanded': 'false',
      },
        el('span', { class: statusClass }, statusLabel),
        el('span', { class: 'build-logs-agent' }, h.agent),
        runtime,
        el('span', { class: 'build-logs-kind' }, h.kind),
        el('span', { class: 'build-logs-age meta' }, age),
        el('span', { class: 'build-logs-cmdline meta' }, h.cmdline),
      );
      const detail = el('div', { class: 'build-logs-detail' });
      detail.hidden = true;

      let streamEs = null;
      rowBtn.addEventListener('click', async () => {
        const expanded = rowBtn.getAttribute('aria-expanded') === 'true';
        rowBtn.setAttribute('aria-expanded', String(!expanded));
        detail.hidden = expanded;
        if (expanded) {
          if (streamEs) { streamEs.close(); streamEs = null; }
          return;
        }
        if (detail.dataset.loaded) return;
        detail.replaceChildren();
        detail.append(
          el('a', {
            href: '/api/build-logs/id/' + h.id + '/raw',
            download: 'build-log-' + h.id + '.txt',
            class: 'build-logs-dl',
          }, '↓ download raw'),
        );
        if (live) {
          const pre = el('pre', { class: 'build-logs-output build-logs-live' }, '');
          const badge = el('span', { class: 'build-logs-live-badge badge badge-running' }, 'live');
          detail.append(badge, pre);

          streamEs = openBuildLogStream(h.id, pre, {
            onDone: (status) => {
              if (durTimer) { clearInterval(durTimer); durTimer = null; }
              if (h.started_at) {
                const elapsed = Math.floor(Date.now() / 1000) - h.started_at;
                runtime.textContent = fmtDuration(Math.max(0, elapsed));
              }
              badge.className = status === 'ok' ? 'badge badge-ok' : 'badge badge-fail';
              badge.textContent = status;
              streamEs = null;
              detail.dataset.loaded = '1';
            },
            onError: () => {
              if (durTimer) { clearInterval(durTimer); durTimer = null; }
              badge.textContent = 'stream error';
              badge.className = 'badge badge-fail';
              streamEs = null;
            },
          });
        } else {
          const pre = el('pre', { class: 'build-logs-output' }, 'fetching…');
          detail.append(pre);
          try {
            const r2 = await fetch('/api/build-logs/id/' + h.id);
            if (!r2.ok) {
              pre.textContent = 'error ' + r2.status;
            } else {
              const full = await r2.json();
              const out = [full.stdout, full.stderr].filter(Boolean).join('\n--- stderr ---\n');
              pre.textContent = out || '(empty)';
            }
            detail.dataset.loaded = '1';
          } catch (err) {
            pre.textContent = 'fetch failed: ' + err;
          }
        }
      });
      li.append(rowBtn, detail);
      ul.append(li);
    }
    buildList.append(ul);
    // Deep-link: ?id=N auto-expands the target row.
    const deepId = new URLSearchParams(location.search).get('id');
    if (deepId) {
      const target = ul.querySelector('[data-log-id="' + deepId + '"]');
      if (target) {
        const btn = target.querySelector('.build-logs-row-btn');
        if (btn) {
          btn.click();
          target.scrollIntoView({ behavior: 'smooth', block: 'start' });
        }
      }
    }
  } catch (err) {
    buildList.replaceChildren();
    buildList.append(el('p', { class: 'meta' }, 'fetch failed: ' + err));
  }
}

if (buildRefresh) buildRefresh.addEventListener('click', fetchBuild);

// ─── SSE handlers ─────────────────────────────────────────────────────────────
let buildRefreshTimer = null;
const SSE_HANDLERS = {
  rebuild_queue_changed(ev) {
    rebuildQueueState = (ev.queue || []).slice();
    renderRebuildQueue({ rebuild_queue: rebuildQueueState });
    updateRebuildCount();
    // Auto-refresh build log list when the queue changes and BUILD L0GS is active.
    if (buildTabs && buildTabs.active() === 'buildlogs') {
      if (buildRefreshTimer) clearTimeout(buildRefreshTimer);
      buildRefreshTimer = setTimeout(fetchBuild, 2000);
    }
  },
  meta_inputs_changed(ev) {
    metaInputsState = (ev.inputs || []).slice();
    renderMetaInputs({ meta_inputs: metaInputsState });
  },
  meta_update_running(ev) {
    metaUpdateRunning = !!ev.running;
    renderMetaInputs({ meta_inputs: metaInputsState });
  },
};

// ─── boot ─────────────────────────────────────────────────────────────────────
async function refreshState() {
  try {
    const resp = await fetch('/api/state');
    if (resp.ok) syncFromSnapshot(await resp.json());
  } catch {
    // best-effort
  }
  renderAll();
}

async function init() {
  initServerWarnings();
  bindAsyncForms(() => refreshState());

  buildTabs = createTabStrip(document.getElementById('builds-tabbar'), {
    defaultId: 'rebuild',
    onShow: (id) => {
      if (id === 'buildlogs' && !buildLogsLoaded) {
        buildLogsLoaded = true;
        fetchBuild();
      }
    },
  });

  await refreshState();

  const es = openStream('/api/dashboard/stream');
  if (es) {
    es.onmessage = (e) => {
      let ev;
      try { ev = JSON.parse(e.data); } catch { return; }
      const h = SSE_HANDLERS[ev.kind];
      if (h) h(ev);
    };
  }
}

init();