// 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 <hive-tab-strip> (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 { $, fmtAgeSecs, openStream, openBuildLogStream, initServerWarnings } from './common.js';
import { el } from '@hive/shared/dom.js';
import { bindAsyncForms } from '@hive/shared/forms.js';
import { themedConfirm } from '@hive/shared/modal.js';
import { fmtAgo, fmtDuration, truncate } from './util.js';
import '@hive/shared/hive-tab-strip.js';
import '@hive/shared/jobq-graph.js';

// ─── derived state ───────────────────────────────────────────────────────────
let metaInputsState = [];
let metaUpdateRunning = false;
// Kept in sync from <hive-jobq-graph>'s `hive-jobq-graph-update` event
// (see mountJobqGraph below) — the component owns fetching GET
// /api/jobq/graph and renders the tree itself; this flat array exists only
// for the two things it doesn't render: the count-pill and the live-log
// panel.
let jobqNodes = [];
let jobqGraphEl = null;

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

// ─── 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 ────────────────────────────────────────────────────────────
// R3BU1LD QU3U3 is <hive-jobq-graph> directly (mara: "replace the build
// queue tab with this component") — no hand-rolled tree/roll-up rendering
// here anymore. The component owns fetching GET /api/jobq/graph and its
// own refresh(); this page just listens for its `hive-jobq-graph-update`
// event to keep `jobqNodes` (the flat array) in sync for the two things
// the generic view doesn't render itself: the count-pill and the live-log
// panel below.
//
// Cancel is the one action this page *does* wire up: the
// `cancellable` attribute turns on the component's own per-node cancel
// button, which dispatches `hive-jobq-graph-cancel` rather than posting
// anything — the endpoint (`/api/rebuild-queue/{id}/cancel`) is this
// page's domain concept, not the generic component's.
function mountJobqGraph() {
  const root = $('rebuild-queue-section');
  if (!root) return;
  root.replaceChildren();
  jobqGraphEl = el('hive-jobq-graph', { endpoint: '/api/jobq/graph', cancellable: '' });
  jobqGraphEl.addEventListener('hive-jobq-graph-update', (e) => {
    jobqNodes = e.detail.nodes || [];
    renderRebuildLiveLog();
    updateRebuildCount();
  });
  jobqGraphEl.addEventListener('hive-jobq-graph-cancel', async (e) => {
    const { id } = e.detail;
    const node = jobqNodes.find((n) => n.id === id);
    const label = node ? node.payload.label : 'node ' + id;
    if (!(await themedConfirm({
      message: `cancel ${label}? a group root cancels the whole subtree; a mid-tree node cancels just that branch.`,
      danger: true, confirmLabel: '✕ cancel',
    }))) return;
    try {
      const r = await fetch('/api/rebuild-queue/' + id + '/cancel', { method: 'POST' });
      if (!r.ok) throw new Error('http ' + r.status);
      // No manual refresh: cancel flips node state, which fires
      // rebuild_queue_changed over SSE — the existing handler below
      // already calls jobqGraphEl.refresh() on that tick.
    } catch (err) {
      console.error('cancel failed', err);
    }
  });
  root.append(jobqGraphEl);
}

// ─── running-rebuild live log ─────────────────────────────────────────────────
// One persistent live-log panel for the first currently-building node.
// Keyed to that node's id and kept in its own container (#rebuild-live-log)
// so the queue's row re-render never tears down an open poll.
//
// Build logs are fetched by polling GET /api/build-log/<node_id> (returns
// {stdout, stderr}) rather than SSE — a running node's log re-fetches on the
// rebuild_queue_changed tick; a terminal node's log is static (one last fetch
// on transition, then done).
let liveLogId = null;      // current node id being shown
let liveLogDone = false;   // true once the node left 'Running'
let liveLogCollapsed = false;
let liveLogPollTimer = null;

function clearLiveLogPoll() {
  if (liveLogPollTimer) { clearInterval(liveLogPollTimer); liveLogPollTimer = null; }
}

// First running node with a log, in wire order (root-then-subtree per
// root, roots in enqueue order — see hive-jobq-wire's wire_snapshot doc).
// Gate on build_log_id so lock/noop/store-only nodes don't open a blank
// panel.
function findLiveBuild() {
  return jobqNodes.find((n) => n.state === 'Running' && n.payload.data && n.payload.data.build_log_id != null)
    || null;
}

async function fetchAndRenderLiveLog(nodeId, pre) {
  try {
    const r = await fetch('/api/build-log/' + nodeId);
    if (!r.ok) return;
    const data = await r.json();
    const text = [data.stdout, data.stderr ? '--- stderr ---\n' + data.stderr : ''].filter(Boolean).join('\n');
    if (pre.textContent !== text) {
      const atBottom = pre.scrollHeight - pre.scrollTop - pre.clientHeight < 40;
      pre.textContent = text;
      if (atBottom) pre.scrollTop = pre.scrollHeight;
    }
  } catch { /* network blip — ignore, next poll will retry */ }
}

function renderRebuildLiveLog() {
  const root = $('rebuild-live-log');
  if (!root) return;
  const liveNode = findLiveBuild();

  if (!liveNode) {
    clearLiveLogPoll();
    liveLogId = null;
    liveLogDone = false;
    if (!root.hidden) { root.hidden = true; root.replaceChildren(); }
    return;
  }

  // Same node, already polling — just let the timer tick (or do a final
  // fetch if the node just went non-running and we haven't marked done yet).
  if (liveNode.id === liveLogId) {
    if (!liveLogDone && liveNode.state !== 'Running') {
      clearLiveLogPoll();
      liveLogDone = true;
      const pre = root.querySelector('.rebuild-live-log-output');
      const badge = root.querySelector('.rebuild-live-log-badge');
      if (pre) fetchAndRenderLiveLog(liveNode.id, pre);
      if (badge) {
        const ok = liveNode.state !== 'Failed';
        badge.className = 'rebuild-live-log-badge ' + (ok ? 'rll-ok' : 'rll-fail');
        badge.textContent = liveNode.state;
      }
    }
    return;
  }

  // New node — tear down old poll, rebuild the panel.
  clearLiveLogPoll();
  liveLogId = liveNode.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 liveAgent = liveNode.payload.data && liveNode.payload.data.agent;
  const header = el('div', { class: 'rebuild-live-log-header' },
    toggle, ' ',
    el('span', { class: 'rebuild-live-log-title' }, 'live build log — '),
    // Label the specific node's agent, not the whole group's agent set.
    el('code', { class: 'rqe-agent' }, liveAgent || ''),
    ' ', el('span', { class: 'rqe-kind' }, liveNode.payload.label),
    ' ', badge, ' ',
    el('a', {
      class: 'rebuild-live-log-raw',
      href: '/api/build-log/' + liveNode.id + '/raw',
      download: 'build-log-' + liveNode.id + '.txt',
    }, '↓ raw'),
  );
  root.append(header, pre);

  // Start polling.
  fetchAndRenderLiveLog(liveNode.id, pre);
  liveLogPollTimer = setInterval(() => fetchAndRenderLiveLog(liveNode.id, pre), 2000);
}

// ─── rebuild-queue count pill ─────────────────────────────────────────────────
function updateRebuildCount() {
  const pill = $('builds-tab-count-rebuild');
  if (!pill) return;
  // Pending/Running/Finishing = in flight (Finishing = own work done, a
  // sub-node still running — still counts). Root nodes only: each is one
  // queue entry.
  const n = jobqNodes.filter((n) => n.parent == null
    && (n.state === 'Pending' || n.state === 'Running' || n.state === 'Finishing')).length;
  if (n > 0) { pill.textContent = String(n); pill.hidden = false; }
  else { pill.hidden = true; }
}

// ─── render-all (cold load + any full re-render) ──────────────────────────────
function renderAll() {
  renderMetaInputs({ meta_inputs: metaInputsState });
  // Rebuild-queue rendering + the count-pill/live-log it drives all happen
  // off <hive-jobq-graph>'s own hive-jobq-graph-update event (see
  // mountJobqGraph) — nothing to render here directly.
}

// ─── 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 ? 'hive-pill-sm badge-running' : ok ? 'hive-pill-sm badge-ok' : 'hive-pill-sm 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 hive-pill-sm 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' ? 'hive-pill-sm badge-ok' : 'hive-pill-sm badge-fail';
              badge.textContent = status;
              streamEs = null;
              detail.dataset.loaded = '1';
            },
            onError: () => {
              if (durTimer) { clearInterval(durTimer); durTimer = null; }
              badge.textContent = 'stream error';
              badge.className = 'hive-pill-sm 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() {
    // No `ev.queue` payload read anymore — this event still carries its own
    // queue snapshot on the wire (tabs.js/SW4RM still consumes it for the
    // swarm badges, untouched by this), this page just treats it as a
    // refetch trigger. <hive-jobq-graph> owns the actual fetch.
    if (jobqGraphEl) jobqGraphEl.refresh();
    // 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());
  // Self-fetches on mount (<hive-jobq-graph>'s own connectedCallback) —
  // no explicit initial fetch needed here, unlike meta inputs below.
  mountJobqGraph();

  buildTabs = document.getElementById('builds-tabbar').configure({
    tabs: [
      { id: 'rebuild', label: 'R3BU1LD QU3U3', badgeId: 'builds-tab-count-rebuild' },
      { id: 'meta', label: 'M3T4 1NPUTS' },
      { id: 'buildlogs', label: 'BUILD L0GS' },
    ],
    defaultId: 'rebuild',
    onShow: (id) => {
      if (id === 'buildlogs' && !buildLogsLoaded) {
        buildLogsLoaded = true;
        fetchBuild();
      }
    },
  });

  await refreshState();

  // kinds= matches SSE_HANDLERS below verbatim — narrows this from all
  // 17 wire kinds down to the 3 this page acts on. This page was one
  // of 4 unfiltered `/api/dashboard/stream` subscribers before this
  // (subscription discipline, part 1 of the dashboard-event-stream-
  // split issue).
  const es = openStream(
    '/api/dashboard/stream?kinds=rebuild_queue_changed,meta_inputs_changed,meta_update_running',
  );
  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();