// PROCITY Lane F — interior_mode.js  [integration glue, F-owned]
// Bridges Lane B's street shell to Lane C's buildInterior library — this is the wiring behind the
// headline "every door opens". Ownership stays clean: Lane B owns the shell + mode machine, Lane C
// owns the room, Lane F owns THIS bridge (a separate module so the shell edits are a thin, marked
// seam rather than logic sprinkled through B's files).
//
// Contract (verified against the real landed code, 2026-07-14):
//   • buildInterior(shop, THREE) → { group(self-lit), spawn:{x,z,ry}, exits:[{x,z,w,toStreet}],
//                                    _debug.grid:{W,D,cols,rows,cw,cd,occ,cellOf}, dispose() }
//   • Room origin = centre, floor y=0. spawn is ~1.5m inside the front door facing −Z into the shop;
//     the (only) street exit sits at the front wall, same x as spawn.
//   • occ cells: 0 free · 1 fitting · 2 wall(border). We collide off occ==1 + room bounds, exactly
//     like Lane C's interior_test.html walk loop, so behaviour matches the tester the room was tuned in.
//
// The interior renders into its OWN dark THREE.Scene (the street scene is frozen, not disposed —
// CITY_SPEC L3 "pause, not dispose"), so returning to the street is instant.

import { buildInterior, getStockPack, makeStockAdapter } from '../interiors/interiors.js';
import { KeeperManager } from '../citizens/keepers.js';   // Lane D — shopkeeper behind the counter
import { createDig, binSeed } from '../interiors/dig.js';  // Lane C — crate-riffle (v2, gated on ?dig=1)
import { collapseBuyItem } from '../interiors/stockpack.js';  // Lane C — R9 buy-anywhere (book spines / toy boxes)

const EYE = 1.6;        // interior eye height (matches interior_test.html; rooms tuned for it)
const RADIUS = 0.30;    // player collision radius inside the room
const SPEED = 3.2;      // interior walk speed (matches the Lane C tester)
const ARM_DIST = 2.0;   // must step this far from the door before the exit arms (spawn is ~1.5m away)
const EXIT_DIST = 1.0;  // …then coming back within this distance leaves to the street

export function createInteriorMode({ THREE, renderer, camera, plan, fleet = null, useGLB = false,
                                    dig: digEnabled = false, stockReal = false, wallet = null,
                                    occupancyOf = null }) {
  const scene = new THREE.Scene();
  scene.background = new THREE.Color('#0e0b07');

  // Lane D shopkeeper — one per interior, at the counter. With a rig `fleet` (§3.4) the keeper is a
  // shared GLB actor; without one it's an asset-free placeholder. Either way it greets the player.
  const keepers = new KeeperManager({ camera, citySeed: plan.citySeed, fleet });

  let current = null;      // active Lane C interior handle
  let currentShop = null;  // the shop record for the active interior (dig per-bin seeding)
  let currentAdapter = null; // [F2 §stock] ?stock=real stockAdapter for this shop (null → parody fallback)
  let doorReturn = null;   // { x, y, z, ry } on the street to restore on exit
  let exitArmed = false;   // disarmed at spawn (spawn sits by the door); arms once player steps inside
  let dig = null;          // [F2] Lane C crate-riffle instance, created lazily on first use (only if ?dig=1)

  const _fwd = new THREE.Vector3();
  const _right = new THREE.Vector3();
  const _up = new THREE.Vector3(0, 1, 0);
  const _digRay = new THREE.Raycaster();

  // [Lane F §F2] crate-riffle wiring (v2, ?dig=1). Lane C ships dig.js + gates the flag; F owns the
  // in-game *input/mode* hook (its LANE_C_NOTES contract) — the same consumer pattern as Lane C's
  // interior_test.html: aim at a record bin, press E → open the riffle, which owns the frame + cursor
  // (pointer must be UNLOCKED — the shell handles that on procity:digOpen). Flag off ⇒ none of this runs.
  function binUnderAim() {
    if (!current) return null;
    const bins = [];
    current.group.traverse((o) => { if (o.userData && o.userData.kind === 'bin') bins.push(o); });
    if (!bins.length) return null;
    _digRay.setFromCamera({ x: 0, y: 0 }, camera);               // crosshair-centre ray
    const hit = _digRay.intersectObjects(bins, true)[0];
    if (hit && hit.distance < 3.2) {
      let o = hit.object;
      while (o && !(o.userData && o.userData.kind === 'bin')) o = o.parent;
      return o;
    }
    // Fallback (matches Lane C's interior_test.html): nearest bin within reach. Uses the bin GROUP's
    // world position, so it works even before the bin's GLB mesh has finished loading (async) and is
    // forgiving of imperfect aim — stand next to a bin, press E.
    const cp = camera.position, wp = new THREE.Vector3();
    let best = null, bd = 2.5;
    for (const b of bins) { b.getWorldPosition(wp); const d = wp.distanceTo(cp); if (d < bd) { bd = d; best = b; } }
    return best;
  }

  function openDig(bin) {
    if (!dig) dig = createDig(THREE, renderer);
    if (dig.active) return;
    const p = new THREE.Vector3(); bin.getWorldPosition(p);
    const key = Math.round(p.x * 100) + '_' + Math.round(p.z * 100);   // stable per-bin key (deterministic pos)
    dig.open({
      seed: binSeed((currentShop && currentShop.seed) || 1, key), count: 16,
      shopName: (current && current.recipe && current.recipe.label) || (currentShop && currentShop.name),
      shop: currentShop,
      stockAdapter: currentAdapter,   // [F2 §stock=real] real covers in the riffle (null → parody)
      // [F R8 — Lane C buy loop v0] bind the session wallet so pulling a sleeve deducts cash + banks it.
      // dig removes the pulled sleeve from the bin; onBuy returns false when broke (no state change).
      getCash: wallet ? () => wallet.cash() : undefined,
      onBuy: wallet ? (item) => wallet.buy(item) : undefined,
      onClose: () => window.dispatchEvent(new CustomEvent('procity:digClose')),
    });
    window.dispatchEvent(new CustomEvent('procity:digOpen'));   // shell releases pointer-lock for the cursor
  }

  // [F R9 — Lane C buy-anywhere] E aimed at a book spine / toy box shelf (userData.buyMesh) buys the
  // nearest item over the same wallet: collapse the quad in place + bank it. Parody stock has no buyMesh
  // → no-op ("not for sale"). Records keep the dig. Reuses collapseBuyItem (Lane C stockpack export).
  const _buyRay = new THREE.Raycaster(), _lp = new THREE.Vector3();
  function buyShelfUnderAim() {
    if (!wallet || !current) return;
    const meshes = [];
    current.group.traverse((o) => { if (o.userData && o.userData.buyMesh && o.userData.buyItems && o.userData.buyItems.length) meshes.push(o); });
    if (!meshes.length) return;
    _buyRay.setFromCamera({ x: 0, y: 0 }, camera);
    const hit = _buyRay.intersectObjects(meshes, false)[0];
    if (!hit || hit.distance > 3.0) return;
    const mesh = hit.object;
    _lp.copy(hit.point); mesh.worldToLocal(_lp);
    let best = null, bd = Infinity;
    for (const it of mesh.userData.buyItems) {
      if (it.sold) continue;
      const d = (it.center.x - _lp.x) ** 2 + (it.center.y - _lp.y) ** 2 + (it.center.z - _lp.z) ** 2;
      if (d < bd) { bd = d; best = it; }
    }
    if (!best) return;
    const item = best.item || {};
    if (wallet.buy({ title: item.title, artist: item.artist, price: item.price || 20 })) {
      collapseBuyItem(mesh, best);   // zero-area the bought quad in place
      flashToast(`SOLD — ${item.title || 'item'} · $${item.price || 20}  ·  $${wallet.cash()} left`);
    } else {
      flashToast('not enough cash');
    }
  }

  if (digEnabled || wallet) {
    addEventListener('keydown', (e) => {
      if (e.code !== 'KeyE' || !current || (dig && dig.active)) return;
      if (digEnabled) { const bin = binUnderAim(); if (bin) { openDig(bin); return; } }  // bin → riffle
      buyShelfUnderAim();                                                                 // shelf → buy
    });
  }

  // a small unobtrusive banner (F-owned; the street HUD is hidden in interior mode)
  const banner = document.createElement('div');
  banner.style.cssText =
    'position:fixed;left:50%;top:14px;transform:translateX(-50%);z-index:20;display:none;' +
    'background:rgba(20,16,10,.82);color:#f4efe6;padding:8px 16px;border-radius:8px;' +
    'font:14px/1.3 -apple-system,Segoe UI,Roboto,sans-serif;text-shadow:0 1px 2px #000;pointer-events:none';
  document.body.appendChild(banner);

  // [F R9] transient buy-feedback toast (shelf-buy). Separate from the persistent banner.
  const toast = document.createElement('div');
  toast.style.cssText =
    'position:fixed;left:50%;bottom:60px;transform:translateX(-50%);z-index:21;display:none;' +
    'background:rgba(14,28,18,.92);color:#8fffb0;padding:8px 16px;border-radius:8px;' +
    'font:600 14px -apple-system,Segoe UI,Roboto,sans-serif;text-shadow:0 1px 2px #000;pointer-events:none';
  document.body.appendChild(toast);
  let _toastT = 0;
  function flashToast(msg) { toast.textContent = msg; toast.style.display = 'block'; _toastT = 1.6; }

  // interior-grid collision — mirrors interior_test.html walkable(): room bounds + occ==1 fittings.
  function walkable(x, z) {
    const g = current._debug.grid;
    if (Math.abs(x) > g.W / 2 - RADIUS || Math.abs(z) > g.D / 2 - RADIUS) return false;
    for (const [ox, oz] of [[RADIUS, 0], [-RADIUS, 0], [0, RADIUS], [0, -RADIUS]]) {
      const [cx, cz] = g.cellOf(x + ox, z + oz);
      if (g.occ[cz * g.cols + cx] === 1) return false;   // walls are handled by the bounds clamp
    }
    return true;
  }

  function nearestExitDist(px, pz) {
    let best = Infinity;
    for (const e of current.exits) {
      if (e.toStreet === false) continue;
      const d = Math.hypot(px - e.x, pz - e.z);
      if (d < best) best = d;
    }
    return best;
  }

  // enter: build the room, show it, drop the player just inside the door. Returns the Lane C handle.
  function enter(shop, name) {
    if (current) exit();   // never stack interiors
    // [F2 §stock=real] real GODVERSE sleeves in this shop's crates. makeStockAdapter(null) → null →
    // Lane C fails soft to the parody canvas, so a missing/unpreloaded pack just shows placeholders.
    currentAdapter = stockReal ? makeStockAdapter(getStockPack(shop.type)) : null;
    current = buildInterior(shop, THREE, { useGLB, stockAdapter: currentAdapter });  // static room sleeves
    currentShop = shop;
    scene.add(current.group);
    // [Lane F R11 audio] fade in this room's seeded bed (Lane C room.audio {musicKey,toneKey} → Lane B engine).
    // Guarded + no-op when muted / ?noassets / pre-gesture / engine still async-loading — silent-and-happy.
    window.PROCITY.audio && window.PROCITY.audio.playInterior(current.audio);
    // Lane D keeper at the counter — Lane C tags the stand pose on the counter interactable
    const counter = current.places.find((p) => p.userData && p.userData.keeperStand);
    if (counter) {
      const st = counter.userData.keeperStand;
      keepers.spawn(current.group, { x: st.x, z: st.z, ry: st.ry, shopId: shop.id, type: shop.type });
    }
    // [F R9 — interior presence, C→D→F seam] browser rigs at C's browse points, one per patronage
    // occupant, capped at 3 (≤3 points). D owns occupancy truth + the rig (KeeperManager browse pose,
    // ~1 draw, no player-greet); F reads occupancy and places them. Freed with the room by exit()'s
    // keepers.disposeAll(). occupants[i].pedIndex → the exact ped who ducked in off the street.
    if (occupancyOf && current.browsePoints && current.browsePoints.length) {
      const occ = occupancyOf(shop.id) || { count: 0, occupants: [] };
      const pts = current.browsePoints.slice(0, Math.min(occ.count | 0, 3));
      pts.forEach((pt, i) => keepers.spawn(current.group, {
        x: pt.x, z: pt.z, ry: pt.ry, shopId: shop.id, browse: true,
        pedIndex: occ.occupants && occ.occupants[i] ? occ.occupants[i].pedIndex : null,
        seedKey: `${shop.id}#${i}`,
      }));
    }
    doorReturn = { x: camera.position.x, y: camera.position.y, z: camera.position.z, ry: camera.rotation.y };
    camera.position.set(current.spawn.x, EYE, current.spawn.z);
    camera.rotation.set(0, current.spawn.ry, 0, 'YXZ');   // PointerLockControls re-reads this on next mouse move
    exitArmed = false;
    let hasBins = false;
    if (digEnabled) current.group.traverse((o) => { if (o.userData && o.userData.kind === 'bin') hasBins = true; });
    banner.textContent = `🚪 ${name || shop.name || 'shop'} — walk out the door or press Esc to leave`
      + (hasBins ? ' · E: riffle a record bin' : '');
    banner.style.display = 'block';
    return current;
  }

  // update: walk + render the interior. Returns true once the player reaches a street exit
  // (the shell then calls exit() + setMode('street') — update never disposes on its own).
  function update(dt, keys) {
    if (!current) return false;
    if (_toastT > 0) { _toastT -= dt; if (_toastT <= 0) toast.style.display = 'none'; }   // [R9] buy toast decay
    // [F2] riffling: the dig owns the whole frame (its own scene/camera + cursor input). No interior
    // walk, no exit check — the player is "in the crate" until they close it (Esc / WALK OUT button).
    if (dig && dig.active) {
      if (dig.update) dig.update(dt);
      renderer.autoClear = true;
      renderer.info.reset();       // autoReset is off (shell owns it for the composer); reset per interior frame
      renderer.render(dig.scene, dig.camera);
      return false;
    }
    const f = (keys.has('KeyW') || keys.has('ArrowUp') ? 1 : 0) - (keys.has('KeyS') || keys.has('ArrowDown') ? 1 : 0);
    const s = (keys.has('KeyD') || keys.has('ArrowRight') ? 1 : 0) - (keys.has('KeyA') || keys.has('ArrowLeft') ? 1 : 0);
    if (f || s) {
      camera.getWorldDirection(_fwd); _fwd.y = 0; _fwd.normalize();
      _right.crossVectors(_fwd, _up).normalize();
      const dx = _fwd.x * f + _right.x * s, dz = _fwd.z * f + _right.z * s;
      const len = Math.hypot(dx, dz) || 1;
      const step = SPEED * dt;
      const nx = (dx / len) * step, nz = (dz / len) * step;
      const p = camera.position;
      if (walkable(p.x + nx, p.z)) p.x += nx;   // per-axis → slide along walls/fittings
      if (walkable(p.x, p.z + nz)) p.z += nz;
      p.y = EYE;
    }

    keepers.update(dt);          // Lane D: keeper idle + turn-to-greet (playerPos defaults to the camera)
    renderer.autoClear = true;   // the composer may have left autoClear=false; force a clean interior frame
    renderer.info.reset();       // autoReset is off (shell owns it for the composer); reset per interior frame so
                                 // renderer.info.render.calls reports THIS frame's draws (HUD + the ≤350 room gate)
    renderer.render(scene, camera);

    const de = nearestExitDist(camera.position.x, camera.position.z);
    if (!exitArmed && de > ARM_DIST) exitArmed = true;
    return exitArmed && de < EXIT_DIST;
  }

  // exit: dispose the room (frees GPU + removes group), restore the player to the street door.
  function exit() {
    if (!current) return;
    window.PROCITY.audio && window.PROCITY.audio.stopInterior();   // [Lane F R11 audio] fade the interior bed out (0.7s)
    if (dig && dig.active) dig.close();   // [F2] close an open riffle before leaving (frees its per-open GPU)
    keepers.disposeAll();   // Lane D: free the keeper actor(s) before the room
    current.dispose();
    current = null;
    currentShop = null;
    currentAdapter = null;
    banner.style.display = 'none';
    toast.style.display = 'none'; _toastT = 0;
    if (doorReturn) {
      camera.position.set(doorReturn.x, doorReturn.y, doorReturn.z);
      camera.rotation.set(0, doorReturn.ry, 0, 'YXZ');
    }
  }

  return {
    enter,
    update,
    exit,
    scene,
    keepers,
    get active() { return !!current; },
    get current() { return current; },
    get digActive() { return !!(dig && dig.active); },   // [F2] shell reads this to keep pointer-lock/Esc sane while riffling
  };
}