// PROCITY Lane D — shopkeepers. One keeper per open shop, standing at the counter slot, playing a
// shared idle clip, turning to greet the player when they come near. Keepers are spawned when an
// interior builds and disposed with it (they don't share the street's rig pool — a handful at a time,
// each owns its actor).
//
// Coordination (Lane F wiring): Lane C exposes the counter position + facing in its interior `places`;
// pass it to spawn(). Until Lane C lands, the test page mocks a counter. Deterministic per shop:
// rng(citySeed,'keeper',shopId) picks the ped type + height so a shop's keeper is stable across visits.

import * as THREE from 'three';
import { rng } from '../core/prng.js';
import { pickRig, spawnRig } from './rigs.js';
import { makePlaceholder } from './placeholder.js';
import { browsePostureFor, keeperPostureFor, GROUP_OF } from './postures.js';

const GREET_RANGE = 6.0;      // m — start turning to the player inside this
const GREET_CLAMP = 0.62;     // rad — max turn off the counter-facing base (~35°)
const GREET_EASE = 3.5;       // turn responsiveness

export class KeeperManager {
  constructor({ camera = null, citySeed = 20261990, fleet = null } = {}) {
    this.camera = camera;
    this.citySeed = citySeed >>> 0;
    this.fleet = fleet;
    this.keepers = [];
    this._p = new THREE.Vector3();
  }

  // spawn(target, { x, z, ry, shopId, type, browse, pedIndex, seedKey }) → keeper handle.
  //   ry       = the counter's outward facing (keeper) / the browse point's shelf-facing yaw (browser).
  //   browse   = R9 interior-presence: a browser rig at a C browse point — faces the goods, no greet.
  //   pedIndex = pick this exact fleet ped (so a browser IS the ped who ducked in off the street).
  //   seedKey  = per-instance seeding key (e.g. `${shopId}#${slot}`) so browsers at one shop differ.
  spawn(target, { x = 0, z = 0, ry = 0, shopId = 'shop', type = 'shop', browse = false, pedIndex = null, seedKey = null, slot = null } = {}) {
    const r = rng(this.citySeed, browse ? 'browser' : 'keeper', seedKey || shopId);
    const height = 1.58 + r() * 0.34;
    // [R41 §41.3] A REAL BROWSE STATE. Until now a "browser" was a rig standing at Lane C's browse
    // point playing the shopkeeper's idle. It now plays a browse clip — hold / carry / open the
    // cabinet / pick the record up — seeded per (shopId, slot), NOT per visit, so the same shop reads
    // the same way every time you walk back in. F already passes `seedKey = "<shopId>#<i>"`; the slot
    // index is taken from it when the caller doesn't pass one, so no shell edit is needed.
    // The keeper gets a seeded idle variant instead, or a trade flavour (the publican pours, the
    // record-shop keeper wears the cans) — see postures.KEEPER_TYPE_CLIP.
    const bank = this.fleet && this.fleet.bank;
    const slotIdx = slot != null ? slot : (seedKey && /#(\d+)$/.test(seedKey) ? +/#(\d+)$/.exec(seedKey)[1] : 0);
    const wantId = browse ? browsePostureFor(this.citySeed, shopId, slotIdx)
                          : keeperPostureFor(this.citySeed, shopId, type);
    if (bank && wantId) bank.ensureGroup(GROUP_OF[wantId]);   // first interior fetches browse.glb; a
                                                              // pub/record counter fetches venue.glb
    let actor, kind, phase = 0;
    // [R42 §42.4] which BODY this figure is wearing, published on the handle. Purely informational —
    // it draws no randoms and changes no behaviour — but without it there is no way to audit a room's
    // cast at runtime, which is exactly what the recast round needed to prove (band.js already
    // publishes `pedIndex` on every crew member; keepers were the gap).
    let pedIdx = null;
    if (this.fleet && this.fleet.ready) {
      // NB the `r()` draw order below is R9's, unchanged and deliberately so: height, then pickRig
      // (only when the caller did NOT pin a pedIndex), then phase (only when a rig resolved). The
      // R41 posture is drawn from its OWN stream above, so no keeper's ped type or height moves.
      const idx = (pedIndex != null && this.fleet.all[pedIndex]) ? pedIndex : (pickRig(this.fleet, r()) || {}).index;
      const rig = idx != null && this.fleet.all[idx];
      const want = bank ? bank.get(wantId) : null;            // resident already? use it at spawn
      const spawned = rig && spawnRig(rig, { ry, height, clip: want || this.fleet.idleClip, phase: (phase = r()) });
      if (spawned && want) spawned.setClip(want, { phase });  // re-plant off the posed skeleton
      if (spawned) { actor = spawned; kind = 'rig'; pedIdx = idx; }
    }
    if (!actor) {                                   // asset-free fallback
      const ph = makePlaceholder(rng(this.citySeed, browse ? 'browser-body' : 'keeper-body', seedKey || shopId), { height });
      ph.fig.rotation.y = ry;
      actor = ph; kind = 'placeholder';
    }
    actor.fig.position.set(x, 0, z);
    target.add(actor.fig);
    // `want` is kept ONLY while the assigned clip is still unresolved — update() upgrades in place the
    // frame its group lands and then clears it. That is what makes lazy loading safe here: the clip a
    // browse point plays is decided by (citySeed, shopId, slot) at spawn, and the fetch only decides
    // when it starts, never which. A boot with no bank leaves `want` null and nothing ever runs.
    // Gated on `fleet.clipsRequested` (boot-stable), NOT on `bank` — a spawn that happens before the
    // dynamic import resolves would otherwise silently lose its posture forever. update() kicks the
    // group itself in that case, so the only thing timing decides is when the upgrade shows.
    const wantsIt = kind === 'rig' && wantId && this.fleet && this.fleet.clipsRequested && !(bank && bank.has(wantId));
    const k = { actor, kind, baseRy: ry, curTurn: 0, target, shopId, type, browse,
                pedIndex: pedIdx, want: wantsIt ? wantId : null, phase };
    this.keepers.push(k);
    return k;
  }

  remove(k) {
    if (!k) return;
    const i = this.keepers.indexOf(k);
    if (i >= 0) this.keepers.splice(i, 1);
    k.target.remove(k.actor.fig);
    k.actor.dispose?.();
  }

  disposeAll() { [...this.keepers].forEach(k => this.remove(k)); }

  // update(dt, playerPos?) — tick idle animation + the greet head/body turn. playerPos defaults to
  // the camera position (the player IS the camera in interior mode).
  update(dt, playerPos = null) {
    const pp = playerPos || (this.camera && this.camera.position) || null;
    const bank = this.fleet && this.fleet.bank;
    for (const k of this.keepers) {
      const a = k.actor;
      // [R41 §41.3] self-heal: the assigned clip's group finished fetching → install it now, once.
      if (k.want && bank && a.setClip) {
        const c = bank.get(k.want);
        if (c) { a.setClip(c, { phase: k.phase }); k.want = null; }
        else bank.ensureGroup(GROUP_OF[k.want]);        // spawned before the bank existed → kick it now
      }
      if (a.mixer) a.mixer.update(dt);           // rig idle
      else a.tick?.(dt, false);                  // placeholder idle

      if (k.browse) continue;                    // browsers face the goods (ry) — no greet turn
      if (pp) {
        const dx = pp.x - a.fig.position.x, dz = pp.z - a.fig.position.z;
        const dist = Math.hypot(dx, dz);
        let want = 0;
        if (dist < GREET_RANGE) {
          // desired absolute facing toward the player, expressed relative to the counter base
          const toPlayer = Math.atan2(-dx, -dz);        // rig-front convention (local -Z)
          let rel = toPlayer - k.baseRy;
          rel = Math.atan2(Math.sin(rel), Math.cos(rel)); // wrap to -π..π
          want = Math.max(-GREET_CLAMP, Math.min(GREET_CLAMP, rel));
        }
        k.curTurn += (want - k.curTurn) * Math.min(1, dt * GREET_EASE);
        a.fig.rotation.y = k.baseRy + k.curTurn;
      }
    }
  }
}