// /stats.html — hive-wide turn-stats rollup.
//
// Extracted from the dashboard ST4TS tab. Pull-only (no SSE): fetched
// from /api/stats-hive on load and on window change. Plain tables/bars —
// this bundle has no chart lib; per-agent trend charts live on each
// agent's own /stats page. The window selector is a hash-routed
// createTabStrip (#1h / #24h / …), matching the per-agent stats page.
import { $, initServerWarnings } from './common.js';
import { createTabStrip } from '@hive/shared/tabs.js';

let hiveStatsWindow = '24h';

function hsFmtInt(n) {
  return Number.isFinite(n) ? new Intl.NumberFormat().format(Math.round(n)) : '0';
}
function hsFmtTokens(n) {
  if (!Number.isFinite(n)) return '0';
  if (n >= 1e9) return (n / 1e9).toFixed(2) + 'B';
  if (n >= 1e6) return (n / 1e6).toFixed(2) + 'M';
  if (n >= 1e3) return (n / 1e3).toFixed(1) + 'k';
  return String(Math.round(n));
}
function hsFmtUsd(n) {
  if (!Number.isFinite(n)) return '$0';
  if (n >= 100) return '$' + n.toFixed(0);
  if (n >= 1) return '$' + n.toFixed(2);
  return '$' + n.toFixed(3);
}
function hsChip(parent, label, value, est) {
  const c = document.createElement('span');
  c.className = 'hive-stats-chip' + (est ? ' est' : '');
  const k = document.createElement('span'); k.className = 'k'; k.textContent = label;
  const v = document.createElement('span'); v.className = 'v'; v.textContent = value;
  c.append(k, v);
  parent.append(c);
}
function hsMeta(parent, text) {
  parent.replaceChildren();
  const p = document.createElement('p');
  p.className = 'meta';
  p.textContent = text;
  parent.append(p);
}
// Shared bar-list renderer for any `KeyCount[]` mix (model/bash/skill).
function renderKeyCountBars(container, mix) {
  container.replaceChildren();
  const max = mix[0].count || 1;
  for (const kc of mix) {
    const row = document.createElement('div'); row.className = 'hive-stats-bar';
    const lbl = document.createElement('span'); lbl.className = 'lbl'; lbl.textContent = kc.key;
    const track = document.createElement('span'); track.className = 'track';
    const fill = document.createElement('span'); fill.className = 'fill';
    fill.style.width = Math.max(2, Math.round(100 * kc.count / max)) + '%';
    track.append(fill);
    const cnt = document.createElement('span'); cnt.className = 'cnt'; cnt.textContent = hsFmtInt(kc.count);
    row.append(lbl, track, cnt);
    container.append(row);
  }
}
// A mix section that hides itself (+ its header) until the backing
// capture has recorded data, so the section never shows an empty block
// while data is pre-capture. Used by bash_mix and skill_mix.
function renderOptionalMix(containerId, headerId, mix) {
  const el = $(containerId);
  const h = $(headerId);
  if (!el) return;
  if (!mix.length) {
    el.replaceChildren();
    el.hidden = true;
    if (h) h.hidden = true;
    return;
  }
  el.hidden = false;
  if (h) h.hidden = false;
  renderKeyCountBars(el, mix);
}

function renderHiveStats(s) {
  const sum = $('hive-stats-summary');
  if (sum) {
    sum.replaceChildren();
    hsChip(sum, 'window', s.window);
    hsChip(sum, 'active agents', hsFmtInt(s.active_agents));
    hsChip(sum, 'turns', hsFmtInt(s.total_turns));
    const totalTok = (s.total_input_tokens || 0) + (s.total_output_tokens || 0)
      + (s.total_cache_read_tokens || 0) + (s.total_cache_creation_tokens || 0);
    hsChip(sum, 'tokens', hsFmtTokens(totalTok));
    hsChip(sum, 'input', hsFmtTokens(s.total_input_tokens));
    hsChip(sum, 'output', hsFmtTokens(s.total_output_tokens));
    hsChip(sum, 'cache read', hsFmtTokens(s.total_cache_read_tokens));
    hsChip(sum, 'est cost', hsFmtUsd(s.est_cost_usd), true);
  }

  const at = $('hive-stats-agents');
  if (at) {
    const agents = s.agents || [];
    if (!agents.length) {
      hsMeta(at, 'no turns in window');
    } else {
      at.replaceChildren();
      const table = document.createElement('table');
      table.className = 'hive-stats-table';
      table.innerHTML = '<thead><tr><th>agent</th><th>turns</th><th>input</th>'
        + '<th>output</th><th>cache read</th><th>est cost</th></tr></thead>';
      const tb = document.createElement('tbody');
      for (const a of agents) {
        const tr = document.createElement('tr');
        const cells = [
          a.name, hsFmtInt(a.turns), hsFmtTokens(a.input_tokens),
          hsFmtTokens(a.output_tokens), hsFmtTokens(a.cache_read_tokens),
          hsFmtUsd(a.est_cost_usd),
        ];
        cells.forEach((txt, i) => {
          const td = document.createElement('td');
          if (i > 0) td.className = 'num';
          td.textContent = txt;
          tr.append(td);
        });
        tb.append(tr);
      }
      table.append(tb);
      at.append(table);
    }
  }

  const mm = $('hive-stats-models');
  if (mm) {
    const mix = s.model_mix || [];
    if (!mix.length) hsMeta(mm, 'no turns in window');
    else renderKeyCountBars(mm, mix);
  }

  // "favorite tools": most-run bash commands across the swarm.
  renderOptionalMix('hive-stats-bash', 'hive-stats-bash-h', s.bash_mix || []);
  // Most-triggered skills across the swarm.
  renderOptionalMix('hive-stats-skills', 'hive-stats-skills-h', s.skill_mix || []);
}

async function refreshHiveStats() {
  try {
    const resp = await fetch('/api/stats-hive?window=' + encodeURIComponent(hiveStatsWindow));
    if (!resp.ok) throw new Error('http ' + resp.status);
    renderHiveStats(await resp.json());
  } catch (e) {
    const at = $('hive-stats-agents');
    if (at) hsMeta(at, 'stats fetch failed: ' + e);
  }
}

initServerWarnings();

// Window selector → hash-routed createTabStrip (#1h / #24h / …). No panes
// here (the selector swaps data, not DOM); paneFor() returns null for each
// tab and the strip's `if (pane)` guard handles it. The initial show()
// fires onShow once → sets the window + does the first fetch, so no
// separate refreshHiveStats() call is needed.
createTabStrip(document.getElementById('hive-stats-windows'), {
  defaultId: hiveStatsWindow,
  onShow: (w) => { hiveStatsWindow = w; refreshHiveStats(); },
});