#!/usr/bin/env node
/**
 * site_audit — is this site winnable, BEFORE it ships?  [Lane B, SPRINT9]
 *
 *   node tools/site_audit/audit.mjs                          # the shipped yard
 *   node tools/site_audit/audit.mjs web/world/data/sites/site_02.json
 *   node tools/site_audit/audit.mjs --storm storm_03_southerly
 *
 * WHY THIS EXISTS, in one number: p1 = 7.4 kN.
 *
 * In SPRINT6 the yard shipped with a bed-covering quad whose corner pulled
 * 7.4 kN against a shop whose best hardware holds 6.5. No loadout could hold it
 * at any price, so the wild night was unwinnable — and it took four lanes two
 * sprints to find out, because nothing checked the site's GEOMETRY against the
 * shop's PRICE LIST at authoring time. Geometry decides winnability. A site is a
 * balance decision disguised as art, and it should be audited the minute it's
 * drawn, not the sprint after it ships.
 *
 * What it does NOT do: score the garden. Winnability is decided before any of
 * that — by whether a quad exists that (a) covers the bed and (b) has peak
 * corner loads the budget can hold. The garden drain only decides how BADLY you
 * lose a site that was already unwinnable. That's also why this runs in node:
 * no skyfx, no document, no browser, ~20 s per site.
 */

import { readFile } from 'node:fs/promises';
import { SailRig, orderRing } from '../../web/world/js/sail.js';
import { createWind } from '../../web/world/js/weather.js';
import { HARDWARE, START_BUDGET, FIXED_DT } from '../../web/world/js/contracts.js';

const [CARABINER, SHACKLE, RATED] = HARDWARE;
const SPARE_COST = 15;
const BAND = { lo: 18, hi: 45 };      // A's a.test rigging band
const MIN_COVER = 0.25;               // A's "shades the bed" bar
const SETTLE_S = 12;                  // D's settle — a player plays through prep
const CALM_STORM = 'storm_01_gentle'; // main.js's CALM_STORM: what wind.use() hands the rig in prep
const PRE_GUST_S = 3;                 // hold the settle inside gentle's pre-gust window (balance.test)

const argv = process.argv.slice(2);
const stormArg = (() => { const i = argv.indexOf('--storm'); return i >= 0 ? argv[i + 1] : 'storm_02_wildnight'; })();
const sitePath = argv.find((a) => !a.startsWith('--') && a !== stormArg) || null;

/**
 * THE SHIPPED YARD, headless — a dump of the DRESSED yard, and it has to be.
 *
 * Node cannot dress: dress() needs GLTFLoader (a bare 'three' specifier) and
 * fetch()es .glb over file://, neither of which works outside a browser. And
 * that matters far more than it sounds, because createWorld() still SUCCEEDS in
 * node — it just hands back the GRAYBOX yard:
 *
 *     graybox (node)          dressed (browser, what the player plays)
 *     h1  x = -5.00           h1  x = -3.00      ← dress() adopts E's fascia
 *     t1  (-9.00, 2.00)       t1  (-9.96, 0.54)  ← dress() adopts branch_anchor_01
 *     t1b/t1c/t2b: ABSENT     t1b/t1c/t2b: exist ← dress() adds them
 *
 * A headless tool that "reads world.js for the real yard" therefore gets the
 * house at x=±5 — the exact fictional yard that made the SPRINT6 harness report
 * the wild night unwinnable, memorialised at the top of balance.test.js. Reading
 * live code is not the same as reading truth. The dump below is the real yard;
 * live world.js, in node, is not.
 *
 * So the deal is: dumped values for what only dress() knows, and a HARD
 * CROSS-CHECK against live world.js for everything dress() never touches.
 * dress() only adopts h1..h3 / t1 / t2 and adds the branch anchors — the four
 * posts are pure world.js, so they are re-verified on every run (verifyPosts).
 * That check exists because the first draft of this file typed p4 straight from
 * world.js's `postSpecs` and missed that posts are RAKED 8° away from centre:
 * it sat 0.56 m off, and the audit dutifully reported on a post that isn't there.
 *
 * This whole apparatus is why SPRINT9 gate 2 (sites as DATA) is worth it. The
 * moment `data/sites/backyard_01.json` exists, pass it and none of this is used.
 */
const BACKYARD_01 = {
  name: 'backyard_01 (dressed-yard dump — posts verified live, see comment)',
  dumped: true,
  bed: { x: 1, z: 2, w: 6, d: 4 },
  anchors: [
    // dress()-only: adopted from E's GLBs. Unverifiable headless.
    ['h1', 'house', -3.00, 2.48, -9.95], ['h2', 'house', 0.00, 2.48, -9.95], ['h3', 'house', 3.00, 2.48, -9.95],
    ['t1', 'tree', -9.96, 3.45, 0.54], ['t2', 'tree', 7.83, 2.93, -0.85],
    ['t1b', 'tree', -9.94, 3.96, 2.78], ['t1c', 'tree', -10.38, 5.05, 2.98], ['t2b', 'tree', 8.14, 3.70, -0.96],
    // pure world.js — cross-checked against live code on every run.
    ['p1', 'post', -4.85, 3.95, 5.93], ['p2', 'post', 4.31, 3.96, 6.46], ['p3', 'post', 0.00, 3.95, 7.56],
    ['p4', 'post', -3.72, 4.00, -1.40],
  ].map(([id, type, x, y, z]) => ({ id, type, pos: { x, y, z } })),
};

/** Anchors dress() never touches — so live world.js IS authoritative for these. */
const VERIFIABLE = new Set(['p1', 'p2', 'p3', 'p4']);

/**
 * Re-derive the posts from live world.js and fail loudly if the dump drifted.
 * The one guard-rail a hand-typed yard can actually have.
 */
async function verifyPosts(site) {
  const THREE = await import('../../web/world/vendor/three.module.js');
  const { createWorld } = await import('../../web/world/js/world.js');
  const stub = {
    sample: (p, t, o) => (o || new THREE.Vector3()).set(0, 0, 4),
    speedAt: () => 4, rainAt: () => 0, rainMmPerHour: () => 0,
    gustTelegraph: () => null, setSheltersFromTrees() {}, eventsBetween: () => [],
  };
  const world = createWorld(new THREE.Scene(), { wind: stub });   // graybox: fine, posts are graybox
  const live = new Map(world.anchors.map((a) => [a.id, a.pos]));
  const drift = [];
  for (const a of site.anchors) {
    if (!VERIFIABLE.has(a.id)) continue;
    const l = live.get(a.id);
    if (!l) { drift.push(`${a.id}: gone from world.js entirely`); continue; }
    const d = Math.hypot(a.pos.x - l.x, a.pos.y - l.y, a.pos.z - l.z);
    if (d > 0.01) drift.push(`${a.id}: dump (${a.pos.x.toFixed(2)}, ${a.pos.y.toFixed(2)}, ${a.pos.z.toFixed(2)}) ` +
      `vs world.js (${l.x.toFixed(2)}, ${l.y.toFixed(2)}, ${l.z.toFixed(2)}) — ${d.toFixed(2)} m out`);
  }
  const missing = [...live.keys()].filter((id) => !site.anchors.some((a) => a.id === id));
  if (missing.length) drift.push(`world.js has anchors this dump has never heard of: ${missing.join(', ')}`);
  return drift;
}

async function loadSite(path) {
  if (!path) return BACKYARD_01;
  const j = JSON.parse(await readFile(path, 'utf8'));
  // site-as-data shape (Lane A, gate 2). Tolerant: only anchors + bed are needed.
  const anchors = (j.anchors || []).map((a) => ({
    id: a.id, type: a.type || 'post',
    pos: { x: a.pos?.x ?? a.x, y: a.pos?.y ?? a.y, z: a.pos?.z ?? a.z },
  }));
  return { name: j.name || path, bed: j.gardenBed || j.bed, anchors };
}

const withSway = (list) => list.map((a) => ({ ...a, sway: () => a.pos }));

/** Ground-plane area, shoelace over the ring — the same formula a.test uses. */
function areaOf(q) {
  const r = orderRing(q);
  let a = 0;
  for (let i = 0, j = r.length - 1; i < r.length; j = i++) a += (r[j].pos.x + r[i].pos.x) * (r[j].pos.z - r[i].pos.z);
  return Math.abs(a / 2);
}

/** Cheapest hardware that holds a corner at `peak` kN, or null if the shop can't. */
const tierFor = (peakN) => HARDWARE.find((h) => h.rating >= peakN) || null;

async function main() {
  const site = await loadSite(sitePath);
  const anchors = withSway(site.anchors);
  const def = JSON.parse(await readFile(new URL(`../../web/world/data/storms/${stormArg}.json`, import.meta.url), 'utf8'));

  console.log(`\nsite_audit — ${site.name}`);
  if (site.dumped) {
    const drift = await verifyPosts(site);
    if (drift.length) {
      console.log('\n✗ FAIL — the built-in yard dump no longer matches world.js:\n');
      for (const d of drift) console.log(`    ${d}`);
      console.log('\n  Every number this tool prints would be about a yard that does not exist.');
      console.log('  Fix the dump (posts are RAKED 8° — use the anchor pos, not postSpecs), or pass a site JSON.\n');
      process.exit(1);
    }
    console.log(`  posts verified against live world.js ✓   ` +
      `dress()-only anchors trusted from the dump: h1,h2,h3,t1,t2,t1b,t1c,t2b`);
    console.log(`  (node cannot dress — live world.js here is the GRAYBOX yard, house at x=±5. See comment.)`);
  }
  console.log(`storm: ${stormArg} (${def.duration}s, downdraftOfTotal ${def.gusts?.downdraftOfTotal ?? '—'})`);
  console.log(`shop: $${START_BUDGET} · ${HARDWARE.map((h) => `${h.name} $${h.cost}/${(h.rating / 1000).toFixed(1)}kN`).join(' · ')}\n`);

  // 1. every quad, in the rigging band, that shades the bed
  const cands = [];
  const A = anchors;
  for (let a = 0; a < A.length; a++) for (let b = a + 1; b < A.length; b++)
    for (let c = b + 1; c < A.length; c++) for (let d = c + 1; d < A.length; d++) {
      const q = [A[a], A[b], A[c], A[d]];
      const area = areaOf(q);
      if (area < BAND.lo || area > BAND.hi) continue;
      let rig;
      try {
        rig = new SailRig({ anchors, gridN: 10 }).attach(q.map((x) => x.id), Array(4).fill(HARDWARE[2]), 1.0);
      } catch { continue; }                       // degenerate ring
      const cover = rig.coverageOver(site.bed, { x: 0, y: 1, z: 0 });
      if (cover >= MIN_COVER) cands.push({ ids: q.map((x) => x.id), area, cover });
    }

  if (!cands.length) {
    console.log(`✗ FAIL — no quad in the ${BAND.lo}-${BAND.hi} m² band shades the bed at all.`);
    console.log(`  The site cannot be rigged. It needs an anchor near the bed before it ships.\n`);
    process.exit(1);
  }

  // 2. peak corner loads, settled, on the real storm. This is the p1=7.4 kN check.
  //
  // This drives the wind the way main.js does, and every clause below is here
  // because the first draft skipped it and MIS-MEASURED:
  //
  //   · createWind (not the raw field) + setSheltersFromTrees — trees knock a
  //     hole downwind, and a quad hanging off tree anchors sits in it. main.js
  //     does this at boot.
  //   · the settle runs on the CALM day on a RUNNING clock, because that is what
  //     wind.use() hands the rig during prep. The first draft settled on STORM
  //     wind frozen at t=0 — the exact anti-pattern balance.test documents at
  //     1.94 kN vs 0.40 kN of standing load at storm entry.
  //   · resetPeaks() at storm entry, because peakLoad is peak-since-ATTACH and
  //     was quietly folding the attach transient + settle into the storm peak.
  //
  // A tool that vets sites is worthless if it doesn't fly the storm the game
  // flies. It reported p1 at 1.1 kN with all three of those wrong.
  const trees = site.anchors.filter((a) => a.type === 'tree');
  const wind = createWind(def);
  wind.setSheltersFromTrees(trees);
  const calmDef = JSON.parse(await readFile(new URL(`../../web/world/data/storms/${CALM_STORM}.json`, import.meta.url), 'utf8'));
  const calmWind = createWind(calmDef);
  calmWind.setSheltersFromTrees(trees);

  const rows = [];
  for (const cnd of cands) {
    // shade cloth: the fabric a competent player takes into a windy night
    const rig = new SailRig({ anchors, gridN: 10, porosity: 0.30 })
      .attach(cnd.ids, Array(4).fill({ name: 'audit', cost: 0, rating: Infinity }), 1.0);
    for (let i = 0, n = Math.round(SETTLE_S / FIXED_DT); i < n; i++) {
      rig.step(FIXED_DT, calmWind, (i * FIXED_DT) % PRE_GUST_S);
    }
    rig.resetPeaks();                                                     // ← the storm starts HERE
    for (let i = 0; i < def.duration * 60; i++) rig.step(FIXED_DT, wind, i * FIXED_DT);

    const corners = rig.corners.map((c) => ({ id: c.anchorId, peak: c.peakLoad }));
    const tiers = corners.map((c) => ({ ...c, tier: tierFor(c.peak) }));
    const unholdable = tiers.filter((c) => !c.tier);
    const hw = tiers.reduce((s, c) => s + (c.tier ? c.tier.cost : 0), 0);
    rows.push({ ...cnd, tiers, unholdable, hw, total: hw + SPARE_COST, affordable: !unholdable.length && hw <= START_BUDGET });
  }
  rows.sort((a, b) => (a.affordable === b.affordable ? a.hw - b.hw : a.affordable ? -1 : 1));

  console.log(`${cands.length} quad(s) in band shading the bed:\n`);
  for (const r of rows) {
    const cs = r.tiers.map((c) => `${c.id} ${(c.peak / 1000).toFixed(1)}kN→${c.tier ? '$' + c.tier.cost : 'NONE'}`).join('  ');
    const mark = r.unholdable.length ? '✗ unholdable' : r.hw <= START_BUDGET ? `✓ $${r.hw}` : `✗ $${r.hw} > $${START_BUDGET}`;
    console.log(`  ${r.ids.join(',').padEnd(18)} ${r.area.toFixed(0).padStart(3)} m²  cover ${(r.cover * 100).toFixed(0).padStart(3)}%  ${mark.padEnd(14)} ${cs}`);
  }

  const winners = rows.filter((r) => r.affordable);
  console.log('');
  if (!winners.length) {
    const best = rows[0];
    console.log(`✗ FAIL — no affordable holding line. Cheapest is ${best.ids.join(',')} at $${best.hw} on a $${START_BUDGET} budget` +
      (best.unholdable.length ? `, and ${best.unholdable.map((c) => c.id).join('/')} exceeds the shop's ${(HARDWARE.at(-1).rating / 1000).toFixed(1)} kN ceiling at any price.` : '.'));
    console.log(`  This is the SPRINT6 p1=7.4 kN failure. Move an anchor, or the site ships unwinnable.\n`);
    process.exit(1);
  }
  const w = winners[0];
  console.log(`✓ PASS — ${winners.length} affordable line(s). Best: ${w.ids.join(',')} — $${w.hw} hardware` +
    `${w.total <= START_BUDGET ? ` (+$${SPARE_COST} spare = $${w.total}, still inside budget)` : ` — no room for a $${SPARE_COST} spare`}` +
    `, ${w.area.toFixed(0)} m², ${(w.cover * 100).toFixed(0)}% of the bed.\n`);
}

main().catch((e) => { console.error('site_audit failed:', e.message); process.exit(2); });