// PROCITY Lane D — the gig band + crowd (v3.0-beta, behind ?gigs=1).
//
// A Friday night at the venue: a 4-piece band on Lane C's stage (guitar / vocal / bass across the
// front, a seated drummer on the up-stage riser) and a mixed crowd at C's watch points — some
// standing, some dancing (John's "a bit of both"). Built on the gate-protected rig path
// (spawnRig → buildFigure, so no giants), with a placeholder fallback when the fleet is absent
// (?noassets — a gig with no GLBs is still a gig).
//
// Instruments: primitives show immediately (asset law), then E's manifest GLBs swap in async where
// present (placeholder-persists, like interiors/glb.js). guitar/bass held at the chest, mic stand +
// drum kit planted, an amp as backline dressing. Gated on fleet.ready so ?noassets never fetches.
//
// Seam: F builds one GigCrew per venue interior and calls spawn() when the gig state is doors/on,
// update(dt) each interior frame, disposeAll() on gig-off / room exit. C owns the stage + watch
// points (room.stage / room.watchPoints); A owns the gig (plan.gigs). Deterministic from (citySeed, gigId).

import * as THREE from 'three';
import { rng, shuffle } from '../core/prng.js';
import { pickRig, spawnRig } from './rigs.js';
import { makePlaceholder } from './placeholder.js';
import { loadGLB } from '../core/loaders.js';

const CROWD_CAP = 12;                // hard ceiling; the real cap is watchPoints.length per venue (≤ always
                                     // holds — F's smoke asserts it). RSL fields the most (8–12 watch points).
const MIC = 0x222226, POLE = 0x9a9a9e, KIT = 0x8f2b24, CHROME = 0xc8c8cc, AMP = 0x15151a, AMPCLOTH = 0x3a3020;
const SEAT_DROP = 0.52;              // the drummer sits: sink the rig so the kit hides the straight legs.
                                     // Reads seated from the front (the crowd POV / money shot); a true
                                     // sit is a clip job — see the LANE_D_NOTES clip wishlist.

// ---- primitive instruments (E's GLBs swap in over these; a gig with no GLBs is still a gig) ----
// Each returns an Object3D in the actor's OUTER-fig local frame. After the R13 facing-normalise the
// rig's front (its chest) is fig-local -Z, so instruments sit on the -Z side and ride the sway.
// Primitives own their geometry/material (tagged ownGeo) so disposeAll frees them; GLB clones share
// the cached gltf's geo/mats and are only detached.
function tagOwn(g) { g.userData.ownGeo = true; return g; }

function guitarPrim(bodyCol, big = false) {
  const g = new THREE.Group();
  const bodyMat = new THREE.MeshStandardMaterial({ color: bodyCol, roughness: 0.5, metalness: 0.1 });
  const neckMat = new THREE.MeshStandardMaterial({ color: 0x2a2018, roughness: 0.7 });
  const bw = big ? 0.30 : 0.34, bh = big ? 0.44 : 0.40;
  const body = new THREE.Mesh(new THREE.BoxGeometry(bw, bh, 0.06), bodyMat);
  const neck = new THREE.Mesh(new THREE.BoxGeometry(0.05, big ? 0.85 : 0.72, 0.03), neckMat);
  neck.position.set(bw * 0.1, bh * 0.5 + (big ? 0.42 : 0.36), 0);
  g.add(body, neck);
  g.position.set(0.02, 1.02, -0.19);          // across the chest (fig-local -Z = the audience-facing front)
  g.rotation.set(0.15, 0, big ? -0.7 : -0.62); // slung diagonally, body angled out to the crowd
  return tagOwn(g);
}
function micStandPrim() {
  const g = new THREE.Group();
  const pole = new THREE.Mesh(new THREE.CylinderGeometry(0.015, 0.02, 1.42, 6),
    new THREE.MeshStandardMaterial({ color: POLE, roughness: 0.4, metalness: 0.6 }));
  pole.position.y = 0.71;
  const head = new THREE.Mesh(new THREE.SphereGeometry(0.045, 8, 6),
    new THREE.MeshStandardMaterial({ color: MIC, roughness: 0.6 }));
  head.position.y = 1.44;
  g.add(pole, head);
  g.position.set(0, 0, -0.26);                // stands just in front of the singer (fig-local -Z)
  return tagOwn(g);
}
// a cheap kit: kick drum + snare + a floor tom + two cymbals on stands. Reads as "drum kit" behind the
// seated drummer; the GLB replaces it when present. Sits on the riser (y = SEAT_DROP compensates the sink).
function drumKitPrim() {
  const g = new THREE.Group();
  const shell = new THREE.MeshStandardMaterial({ color: KIT, roughness: 0.4, metalness: 0.1 });
  const chrome = new THREE.MeshStandardMaterial({ color: CHROME, roughness: 0.3, metalness: 0.7 });
  const skin = new THREE.MeshStandardMaterial({ color: 0xe8e4d8, roughness: 0.6 });
  const kick = new THREE.Mesh(new THREE.CylinderGeometry(0.30, 0.30, 0.42, 16), shell);
  kick.rotation.x = Math.PI / 2; kick.position.set(0, 0.30, 0);
  const kickHead = new THREE.Mesh(new THREE.CircleGeometry(0.29, 16), skin);
  kickHead.position.set(0, 0.30, -0.215); kickHead.rotation.y = Math.PI;
  const snare = new THREE.Mesh(new THREE.CylinderGeometry(0.16, 0.16, 0.16, 14), chrome);
  snare.position.set(-0.32, 0.58, -0.10);
  const tom = new THREE.Mesh(new THREE.CylinderGeometry(0.19, 0.19, 0.22, 14), shell);
  tom.position.set(0.34, 0.52, -0.06);
  const mkCymbal = (x, y, r) => {
    const c = new THREE.Group();
    const stand = new THREE.Mesh(new THREE.CylinderGeometry(0.012, 0.012, y, 6), chrome);
    stand.position.y = y / 2;
    const disc = new THREE.Mesh(new THREE.CylinderGeometry(r, r, 0.01, 16), chrome);
    disc.position.y = y;
    c.add(stand, disc); c.position.x = x; return c;
  };
  g.add(kick, kickHead, snare, tom, mkCymbal(-0.44, 0.86, 0.18), mkCymbal(0.50, 0.94, 0.20));
  g.position.set(0, SEAT_DROP, -0.60);        // on the riser, in front of the seated drummer (fig-local -Z)
  return tagOwn(g);
}
function instrumentFor(role) {
  if (role === 'guitar') return guitarPrim(0xb23b2e);          // sunburst-ish red
  if (role === 'bass') return guitarPrim(0x2f3a52, true);       // dark blue, bigger body + longer neck
  if (role === 'vocal') return micStandPrim();
  if (role === 'drums') return drumKitPrim();
  return null;
}

// role → E's manifest fitting id + its transform in the actor's fig-local frame (front/chest = -Z).
// GLBs are base-origin metres (glb_law): guitar/bass stand upright (long axis +Y = neck, thin face along
// Z), so a +Z roll slings them diagonally across the chest; the mic stand is upright as-is; the kit is
// scaled to fit C's tight riser gap (vocalist 0.73 m in front of the drummer) and planted in front of the
// sunk drummer. Tuned on-screen. Body-origin → position is where the strap-button / base sits.
const GLB_FIT = {
  guitar: { id: 'electric_guitar', pos: [0.14, 0.60, -0.15], rot: [0.22, 0.0, 0.72], scale: 1 },
  bass:   { id: 'bass_guitar',     pos: [0.14, 0.58, -0.15], rot: [0.22, 0.0, 0.66], scale: 1 },
  vocal:  { id: 'mic_stand',       pos: [0.00, 0.00, -0.30], rot: [0, 0, 0],          scale: 0.9 },
  drums:  { id: 'drum_kit',        pos: [0.00, SEAT_DROP, -0.30], rot: [0, Math.PI, 0], scale: 0.66 },
};

// manifest (self-fetched, promise-cached, fail-soft). ONLY called behind a fleet.ready gate, so under
// ?noassets (fleet === null) this never runs → zero asset fetch, primitives everywhere. Decoupled from
// Lane C's interiors/glb.js on purpose (band.js is asset-law self-contained).
let _manifestP = null;
function loadManifest() {
  return (_manifestP ||= fetch('assets/manifest.json').then(r => (r.ok ? r.json() : null)).catch(() => null));
}

export class GigCrew {
  constructor({ citySeed = 20261990, fleet = null } = {}) {
    this.citySeed = citySeed >>> 0;
    this.fleet = fleet;
    this.members = [];   // { actor, kind, part, role, dance, seated, base:{x,y,z,ry}, phase, extra:[] }
    this.props = [];     // planted dressing added straight to the room group (amp) — freed on disposeAll
    this._gen = 0;       // bumped every spawn/dispose; async GLB swaps bail if the gen moved (room gone)
    this.t = 0;
  }

  // one seeded rig (or placeholder) actor, planted + facing ry. `key` seeds identity per gig+slot.
  _make(target, key, { x, y, z, ry, height, pedIndex = null }) {
    const r = rng(this.citySeed, 'gig', key);
    const h = height != null ? height : 1.6 + r() * 0.3;
    let actor, kind, usedIndex = null;
    if (this.fleet && this.fleet.ready) {
      const pk = (pedIndex != null && this.fleet.all[pedIndex]) ? { index: pedIndex } : pickRig(this.fleet, r());
      const rig = pk && this.fleet.all[pk.index];
      const sp = rig && spawnRig(rig, { ry, height: h, clip: this.fleet.idleClip, phase: r() });
      if (sp) { actor = sp; kind = 'rig'; usedIndex = pk.index; }   // usedIndex: the fleet ped shown — F's continuity smoke reads it
    }
    if (!actor) { actor = makePlaceholder(rng(this.citySeed, 'gig-body', key), { height: h }); actor.fig.rotation.y = ry; kind = 'placeholder'; }
    actor.fig.position.set(x, y, z);
    target.add(actor.fig);
    return { actor, kind, pedIndex: usedIndex };
  }

  // spawn(roomGroup, { stage, watchPoints, gig, roster }) — the band on the deck + crowd at the watch points.
  // roster (R14): [{pedIndex,height}] of the punters who entered this venue tonight (D's citizens.tonightRoster);
  // the crowd's front slots become them (continuity), seeded strangers fill the rest.
  spawn(roomGroup, { stage = null, watchPoints = [], gig = { gigId: 0 }, roster = [], instrumentFor: instFor = instrumentFor } = {}) {
    this.disposeAll();
    const gid = (gig && gig.gigId) | 0;   // null-safe (a quiet-night call would pass no gig)
    this._gen++;
    const gen = this._gen;

    // ── band: C's bandPoses (guitar / vocal / bass across the front, + a seated `drums` on the riser) ──
    if (stage && stage.bandPoses) {
      // distinct fleet peds per gig (a band with two identical members reads wrong)
      const distinct = (this.fleet && this.fleet.ready)
        ? shuffle(rng(this.citySeed, 'gigband', gid), this.fleet.all.map((_, i) => i)) : [];
      stage.bandPoses.forEach((p, i) => {
        const seated = p.role === 'drums' || !!p.seated;
        const poseY = p.y != null ? p.y : (stage.deckY || 0);   // C tags per-pose y (front line deckY, drums riser)
        const y = seated ? poseY - SEAT_DROP : poseY;           // sink the drummer so the kit hides the legs
        const { actor, kind, pedIndex } = this._make(roomGroup, `band:${gid}:${p.role}:${i}`,
          { x: p.x, y, z: p.z, ry: p.ry, pedIndex: distinct.length ? distinct[i % distinct.length] : null,
            height: 1.68 + rng(this.citySeed, 'gigh', `${gid}:${i}`)() * 0.2 });
        const member = { actor, kind, pedIndex, part: 'band', role: p.role, dance: false, seated,
          base: { x: p.x, y, z: p.z, ry: p.ry }, phase: rng(this.citySeed, 'gigp', `b${gid}:${i}`)() * Math.PI * 2, extra: [] };
        const inst = instFor(p.role);
        if (inst) { actor.fig.add(inst); member.extra.push(inst); }
        this.members.push(member);
        this._upgradeInstrument(member, gen);                   // async GLB swap over the primitive (fleet-gated)
      });
      this._addBackline(roomGroup, stage, gen);                 // amp dressing beside the riser (async, dressing)
    }

    // ── crowd: R14 identity continuity — the front slots become tonight's roster (the punters who came in
    // via the queue / surge), seeded strangers fill the remainder. The roster override passes {pedIndex,height}
    // for that slot only; _make's existing branches then skip that slot's own height+pickRig draws. Because
    // every crowd slot is an INDEPENDENTLY keyed stream (`gig`/`crowd:<gid>:<slot>`), this can't shift any
    // other slot, the sway-phase stream (`gigp`), or the band — and an EMPTY roster is byte-identical to R13
    // (no override → the exact R13 draws). Roster heights are the sim's 1.55–1.95 m, inside the [1.4,2.0] gate.
    const pts = watchPoints.slice(0, Math.min(CROWD_CAP, watchPoints.length));
    let fromRoster = 0;
    pts.forEach((w, i) => {
      const who = roster[i] || null;
      const { actor, kind, pedIndex } = this._make(roomGroup, `crowd:${gid}:${w.slotIndex}`,
        who ? { x: w.x, y: 0, z: w.z, ry: w.ry, pedIndex: who.pedIndex, height: who.height }
            : { x: w.x, y: 0, z: w.z, ry: w.ry });
      if (who) fromRoster++;
      this.members.push({ actor, kind, pedIndex, part: 'crowd', role: 'fan', dance: !!w.dance, seated: false, fromRoster: !!who,
        base: { x: w.x, y: 0, z: w.z, ry: w.ry }, phase: rng(this.citySeed, 'gigp', `c${gid}:${w.slotIndex}`)() * Math.PI * 2, extra: [] });
    });
    return { band: this.members.filter(m => m.part === 'band').length, crowd: pts.length, fromRoster };
  }

  // Swap a band member's primitive instrument for E's manifest GLB, placeholder-persists style. Fail-soft
  // at every step (no manifest / no entry / depot unreachable → the primitive stays), and generation-guarded
  // so a GLB that resolves after the room is gone (or re-spawned) is dropped, never attached to a dead rig.
  _upgradeInstrument(member, gen) {
    if (!this.fleet || !this.fleet.ready) return;               // ?noassets → primitive only, no fetch
    const cfg = GLB_FIT[member.role];
    if (!cfg) return;
    loadManifest().then((mani) => {
      if (!mani || !mani.fittings || this._gen !== gen) return;
      const entry = mani.fittings[cfg.id];
      if (!entry || !entry.file) return;
      return loadGLB(`depot:${entry.file}`).then((gltf) => {
        if (!gltf || this._gen !== gen || !member.actor.fig.parent) return;   // room rebuilt / disposed mid-flight
        const inst = gltf.scene.clone(true);                    // shares cached geo/mats — detach only, never dispose
        inst.position.set(...cfg.pos);
        inst.rotation.set(...cfg.rot);
        inst.scale.setScalar(cfg.scale || 1);
        inst.traverse((o) => { if (o.isMesh) { o.castShadow = false; o.frustumCulled = false; } });
        for (const ex of member.extra) { if (ex.parent) ex.parent.remove(ex); disposePrim(ex); }
        member.extra.length = 0;
        member.actor.fig.add(inst);
        member.extra.push(inst);
      });
    });
  }

  // A guitar amp as backline dressing, planted on the deck just off the riser (the classic pub backline).
  // Dressing, not an instrument — planted in the room group (this.props), GLB-only (skipped under ?noassets).
  _addBackline(roomGroup, stage, gen) {
    if (!this.fleet || !this.fleet.ready) return;
    loadManifest().then((mani) => {
      if (!mani || !mani.fittings || this._gen !== gen) return;
      const entry = mani.fittings.guitar_amp;
      if (!entry || !entry.file) return;
      return loadGLB(`depot:${entry.file}`).then((gltf) => {
        if (!gltf || this._gen !== gen) return;
        const amp = gltf.scene.clone(true);
        amp.traverse((o) => { if (o.isMesh) { o.castShadow = false; o.frustumCulled = false; } });
        // R15 (C's §3 ruling): up-stage-right behind the front line — clears the bass rig and offsets from
        // C's primitive ampStacks (at ±w·0.28, z−d·0.18), so GLB + primitive read as a flanking backline.
        // The old z+0.15 was down-stage and interpenetrated the bassist. Room-local coords; grille to the crowd.
        amp.position.set(stage.x + (stage.w || 3) * 0.36, (stage.deckY || 0), stage.z - (stage.d || 3) * 0.22);
        roomGroup.add(amp);
        this.props.push(amp);
      });
    });
  }

  // procedural motion layered on the idle clip (seeded phase → the crowd never metronomes in sync).
  update(dt) {
    this.t += dt;
    const t = this.t;
    for (const m of this.members) {
      if (m.actor.mixer) m.actor.mixer.update(dt);      // rig idle
      else m.actor.tick && m.actor.tick(dt, false);     // placeholder idle
      const f = m.actor.fig, b = m.base, ph = m.phase;
      if (m.part === 'band') {
        if (m.seated) {                                  // drummer: seated bob + a little shoulder work, planted
          f.position.y = b.y + Math.abs(Math.sin(t * 3.4 + ph)) * 0.03;
          f.rotation.z = Math.sin(t * 3.4 + ph) * 0.04;
        } else if (m.role === 'vocal') {                 // singer: gentle sway toward the mic
          f.rotation.z = Math.sin(t * 2.0 + ph) * 0.035;
          f.position.z = b.z + Math.sin(t * 1.3 + ph) * 0.02;
        } else {                                         // guitar / bass: rhythmic strum-sway + tiny bob
          f.rotation.z = Math.sin(t * 3.1 + ph) * 0.055;
          f.position.y = b.y + Math.abs(Math.sin(t * 3.1 + ph)) * 0.02;
        }
      } else if (m.dance) {                              // dancer: bounce + sway + a little step
        f.position.y = b.y + Math.abs(Math.sin(t * 5.2 + ph)) * 0.075;
        f.rotation.z = Math.sin(t * 2.6 + ph) * 0.07;
        f.rotation.y = b.ry + Math.sin(t * 1.7 + ph) * 0.13;
      } else {                                           // stander: slow weight shift, feet planted
        f.rotation.z = Math.sin(t * 0.9 + ph) * 0.022;
        f.rotation.y = b.ry + Math.sin(t * 0.5 + ph) * 0.03;
      }
    }
    return this.members.length;
  }

  disposeAll() {
    for (const m of this.members) {
      if (m.actor.fig.parent) m.actor.fig.parent.remove(m.actor.fig);
      for (const ex of m.extra) disposePrim(ex);       // GLB clones (shared geo/mats) are skipped inside
      m.actor.dispose && m.actor.dispose();
    }
    for (const p of this.props) { if (p.parent) p.parent.remove(p); }   // GLB dressing — cached geo/mats, detach only
    this.members.length = 0;
    this.props.length = 0;
    this._gen++;                                         // invalidate any GLB load still in flight
    this.t = 0;
  }
}

// Free a primitive instrument's own geometry/materials. GLB clones share the cached gltf's geo/mats,
// so they are detached from the scene by disposeAll but NEVER disposed here (tagged: no ownGeo).
function disposePrim(obj) {
  if (obj.parent) obj.parent.remove(obj);
  if (!obj.userData || !obj.userData.ownGeo) return;   // GLB clone → shared resources, leave them cached
  obj.traverse((o) => { if (o.isMesh) { o.geometry.dispose(); o.material.dispose && o.material.dispose(); } });
}