// PROCITY Lane B — dbg.js
// The QA debug harness hook (window.DBG), installed by the shell only with ?dbg=1. It drives Lane
// F's tools/shots.py + tools/soak.py (LANE_F_NOTES §4) and mirrors 90sDJsim's window.DBG.shot()
// contract: named camera bookmarks, teleport, time-of-day, scripted shop entry, and a perf/heap
// readout. Every pose is derived from the LIVE plan so bookmarks work on any seed; the day/night
// cycle is paused on the first scripted segment change so captures are deterministic.
//
// Lives in its own module (not the shell) so it can grow without touching index.html — the shell
// just calls installDBG(deps) with the systems it owns when ?dbg=1 is present.

export function installDBG(deps) {
  const { plan, camera, renderer, composer, chunks, lighting, player, hud,
    setMode, getMode, enterShop } = deps;
  const CS = 64;

  // reset the perf counters, then render one full composited frame (bloom + output) so the harness
  // captures exactly this frame and renderer.info reflects it — robust even when rAF is throttled.
  const render = () => { renderer.info.reset(); composer.render(); };

  const info = () => {
    const r = renderer.info;
    return {
      drawCalls: r.render.calls, tris: r.render.triangles,
      fps: hud && hud.getFps ? hud.getFps() : null,
      heapMB: (performance.memory ? +(performance.memory.usedJSHeapSize / 1048576).toFixed(1) : null),
      geometries: r.memory.geometries, textures: r.memory.textures,
      chunk: `${Math.round(player.position.x / CS)},${Math.round(player.position.z / CS)}`,
      chunks: chunks.count, mode: getMode(),
    };
  };

  // ── camera pose facing a shop's front ──
  // Front normal = local +Z rotated by lot.ry; the shopfront sits d/2 out from the lot centre, so we
  // stand `dist` m IN FRONT OF THE SHOPFRONT (not the centre — deep lots like the dept anchor would
  // otherwise put the camera inside the facade), offset slightly for a 3/4 angle, looking at it.
  const lotOf = (shop) => plan.lots?.find((l) => l.id === shop.lot);
  const poseForShop = (shop, dist = 10) => {
    const lot = shop && lotOf(shop); if (!lot) return null;
    const ry = lot.ry || 0, fx = Math.sin(ry), fz = Math.cos(ry);   // front normal
    const rx = Math.cos(ry), rz = -Math.sin(ry);                    // right vector
    const half = (lot.d || 8) / 2, off = 1.0;                       // near dead-on (terraced neighbours flank the frame)
    const frontX = lot.x + fx * half, frontZ = lot.z + fz * half;   // shopfront centre
    return {
      pos: [frontX + fx * dist + rx * off, 2.0, frontZ + fz * dist + rz * off],
      look: [frontX, 2.2, frontZ],
    };
  };
  const byDist = () => [...(plan.shops || [])].sort((a, b) => {
    const la = lotOf(a), lb = lotOf(b);
    return Math.hypot(la?.x || 0, la?.z || 0) - Math.hypot(lb?.x || 0, lb?.z || 0);
  });
  // nearest shop matching pred, else nearest shop overall → a pose is always produced
  const pickShop = (pred) => { const s = byDist(); return poseForShop(s.find(pred) || s[0]); };

  // Named bookmarks (LANE_F_NOTES §4). seg = day segment index (0 DAWN … 5 NIGHT).
  // Predicates cover both Lane A's taxonomy (dept/stall/record/…) and the fixture's; each falls back
  // to the nearest shop, so every bookmark always yields a valid street pose.
  const BOOKMARKS = {
    street_noon:   { seg: 2, resolve: () => pickShop(() => true) },
    arcade:        { seg: 3, resolve: () => pickShop((s) => s.type === 'dept' || /arcade/.test(s.type)) },
    market_square: { seg: 1, resolve: () => pickShop((s) => s.type === 'stall' || s.type === 'market') },
    milkbar_dusk:  { seg: 4, resolve: () => pickShop((s) => s.type === 'milkbar') },
    night_neon:    { seg: 5, resolve: () => pickShop((s) => s.type === 'record' || s.type === 'video') },
  };

  const DBG = {
    // true once the initial chunks are built and the queue is drained (textures may still decode)
    get ready() { return chunks.count > 0 && chunks.pending === 0; },
    bookmarks: Object.keys(BOOKMARKS),
    info,

    // time-of-day (hands the day cycle to the harness so captures are deterministic)
    setSegment(seg) { lighting.setPaused(true); lighting.setSegment(seg | 0); return lighting.getClock(); },

    // drive the soak walk: place the player and stream the destination in before the next step/shot
    teleport(x, z, ry = 0) {
      if (getMode() !== 'street') setMode('street');
      player.teleport(x, z, ry);
      chunks.warmup(player.position);
      render();
      return info();
    },

    // snap to a named bookmark, settle, and return the frame's stats
    shot(name) {
      const bm = BOOKMARKS[name] || BOOKMARKS.street_noon;
      const pose = bm.resolve();
      if (getMode() !== 'street') setMode('street');
      if (bm.seg != null) { lighting.setPaused(true); lighting.setSegment(bm.seg); }
      if (pose) {
        player.teleport(pose.pos[0], pose.pos[2], 0);
        camera.position.set(pose.pos[0], pose.pos[1], pose.pos[2]);
        chunks.warmup(camera.position);
        camera.lookAt(pose.look[0], pose.look[1], pose.look[2]);
        camera.updateMatrixWorld();
      }
      render(); render();   // two frames so bloom + the segment change settle before capture
      return { name, ...info() };
    },

    // scripted interior visit (drives the record_interior shot + the soak memory-baseline gate)
    enterShop(shopId) {
      const s = (plan.shops || []).find((x) => x.id === shopId);
      if (!s) return { error: `no shop ${shopId}` };
      enterShop(s.id, s.name);
      return { entered: s.id, name: s.name };
    },
    exitShop() { window.dispatchEvent(new CustomEvent('procity:exitShop')); return { exited: true }; },
  };

  window.DBG = DBG;
  console.log('[procity] DBG harness ready (?dbg=1) — shot/teleport/setSegment/enterShop/exitShop/info/ready');
  return DBG;
}