import * as THREE from 'three';
import type { App, View } from '../core/app';
import { audio } from '../core/audio';
import { eye } from '../ui/eye';
import {
  type FryerPotSession,
  newFryerPotSession,
  setOilKnob,
  basket,
  fryerPotStep,
  fryerPotResult,
  oilWord,
  chipWord,
  meanCooked,
  meanGold,
  BLANCH_LO,
  GOLD_AT,
  SPIT_AT,
} from '../sim/fryer';
import { el, Panel } from '../ui/hud';
import { loadBackdrop } from './props';
import { loadProp } from './assets';

const POT_Y = 0.55;
const POT_R = 1.05;

/**
 * THE FRYER — the pot of oil, the basket, the rack, and where your hand is.
 *
 * WHEEL sets the flame under the pot (the oil answers SLOWLY — thermal mass
 * is the whole lesson). SPACE drops the basket in or lifts it to the rack.
 * The pointer is your HAND: raw chips in screaming oil spit, and a spit only
 * burns the hand parked over the pot. Stand back. ENTER serves.
 */
export class FryerPotView implements View {
  readonly root = new THREE.Group();

  private session: FryerPotSession | null = null;
  private flame!: THREE.Mesh;
  private oilSurf!: THREE.Mesh;
  private basketGrp!: THREE.Group;
  private chipMeshes: THREE.Mesh[] = [];
  private rack!: THREE.Mesh;
  private spitFlashes: { m: THREE.Mesh; t: number }[] = [];
  private lastSpits = 0;
  private lastBurns = 0;

  private ray = new THREE.Raycaster();
  private hit = new THREE.Vector3();
  private plane = new THREE.Plane(new THREE.Vector3(0, 1, 0), -(POT_Y + 0.15));

  private bgTex = loadBackdrop('/assets/img/bg_pot.png');
  private prevBg: unknown = null;

  private panel: Panel;
  private askEl!: HTMLElement;
  private cardEl!: HTMLElement;
  private stateEl!: HTMLElement;
  private wordEl!: HTMLElement;
  private hintEl!: HTMLElement;

  onDone: ((result: ReturnType<typeof fryerPotResult>) => void) | null = null;

  constructor(private app: App) {
    this.buildScenery();
    this.panel = new Panel('fryerpot-panel');
    this.buildUi();
    this.panel.hide();
  }

  private buildUi(): void {
    const p = this.panel.root;
    const card = el('div', 'slicer-card', p);
    el('div', 'drawer-lbl', card, 'FRY IT. TWICE.');
    this.askEl = el('div', 'slicer-ask', card, '');
    this.cardEl = el('div', 'fryer-card', card, '');
    this.stateEl = el('div', 'slicer-thick', card, '');
    this.wordEl = el('div', 'slicer-wobble', card, '');
    this.hintEl = el('div', 'drawer-hint', p, '');
  }

  private buildScenery(): void {
    const bench = new THREE.Mesh(
      new THREE.BoxGeometry(9, 0.4, 6),
      new THREE.MeshStandardMaterial({ color: 0x3a3a3e, roughness: 0.7, metalness: 0.2 }),
    );
    bench.position.y = -0.2;
    bench.receiveShadow = true;
    this.root.add(bench);

    const burner = new THREE.Mesh(
      new THREE.CylinderGeometry(0.8, 0.9, 0.12, 24),
      new THREE.MeshStandardMaterial({ color: 0x151515, roughness: 0.8, metalness: 0.4 }),
    );
    burner.position.y = 0.06;
    this.root.add(burner);
    this.flame = new THREE.Mesh(
      new THREE.ConeGeometry(0.6, 0.42, 20),
      new THREE.MeshBasicMaterial({ color: 0x3a7bff, transparent: true, opacity: 0 }),
    );
    this.flame.position.y = 0.3;
    this.root.add(this.flame);

    // The pot — deeper and darker than the poach pot. It has opinions.
    const pot = new THREE.Mesh(
      new THREE.CylinderGeometry(POT_R, POT_R * 0.9, 0.85, 32, 1, true),
      new THREE.MeshStandardMaterial({ color: 0x2e2e33, roughness: 0.45, metalness: 0.75, side: THREE.DoubleSide }),
    );
    pot.position.y = POT_Y - 0.05;
    this.root.add(pot);
    // The oil surface stays procedural — it is the thermometer, and it has to
    // shimmer, darken and be readable. Only the vessel gets replaced.
    void loadProp('/assets/models/fryer_pot.glb', 2.05)
      .then((prop) => {
        prop.position.set(0, 0.04, 0);
        pot.visible = false;
        this.root.add(prop);
      })
      .catch(() => undefined);
    // Sized to the GLB pot's inner rim, not the understudy cylinder's — the
    // oil poking out past the steel was the giveaway.
    this.oilSurf = new THREE.Mesh(
      new THREE.CylinderGeometry(POT_R * 0.64, POT_R * 0.64, 0.05, 32),
      new THREE.MeshStandardMaterial({ color: 0xc9a23a, roughness: 0.15, metalness: 0.3, transparent: true, opacity: 0.9 }),
    );
    this.oilSurf.position.y = POT_Y + 0.2;
    this.root.add(this.oilSurf);

    // The basket: a wire cage on a long handle, chips inside.
    this.basketGrp = new THREE.Group();
    const cage = new THREE.Mesh(
      new THREE.CylinderGeometry(0.62, 0.5, 0.42, 16, 1, true),
      new THREE.MeshStandardMaterial({ color: 0x9aa0a6, roughness: 0.35, metalness: 0.8, side: THREE.DoubleSide, transparent: true, opacity: 0.55 }),
    );
    const handle = new THREE.Mesh(
      new THREE.BoxGeometry(1.5, 0.05, 0.09),
      new THREE.MeshStandardMaterial({ color: 0x1b1b1b, roughness: 0.6 }),
    );
    handle.position.set(1.35, 0.18, 0);
    this.basketGrp.add(cage, handle);
    this.root.add(this.basketGrp);
    void loadProp('/assets/models/fryer_basket.glb', 1.7)
      .then((prop) => {
        // Sits proud of the oil line: a basket you cannot see is a basket you
        // cannot judge. The handle stays procedural — it reads as the thing
        // your hand is on.
        prop.position.set(0, -0.02, 0);
        cage.visible = false;
        this.basketGrp.add(prop);
      })
      .catch(() => undefined);

    // The rack, stage left — where the resting happens.
    this.rack = new THREE.Mesh(
      new THREE.BoxGeometry(1.5, 0.06, 1.1),
      new THREE.MeshStandardMaterial({ color: 0x8a6a3a, roughness: 0.8 }),
    );
    this.rack.position.set(-2.5, 0.45, 0.6);
    this.rack.receiveShadow = true;
    this.root.add(this.rack);
    void loadProp('/assets/models/drain_rack.glb', 1.8)
      .then((prop) => {
        prop.position.set(-2.5, 0.4, 0.6);
        this.rack.visible = false;
        this.root.add(prop);
      })
      .catch(() => undefined);
  }

  reset(count = 8, cardText = '', askText = 'chips — twice. once for cooked, once for golden'): void {
    this.session = newFryerPotSession(count);
    this.lastSpits = 0;
    this.lastBurns = 0;
    for (const m of this.chipMeshes) this.root.remove(m);
    for (const f of this.spitFlashes) this.root.remove(f.m);
    this.chipMeshes = [];
    this.spitFlashes = [];
    for (let i = 0; i < count; i++) {
      const chip = new THREE.Mesh(
        new THREE.BoxGeometry(0.34, 0.11, 0.11),
        new THREE.MeshStandardMaterial({ color: 0xf2e6c4, roughness: 0.75 }),
      );
      chip.castShadow = true;
      this.chipMeshes.push(chip);
      this.root.add(chip);
    }
    // Same sticky-word trap as the mandoline: updateHud deliberately refuses
    // to overwrite the accident line, so a fresh session must clear it or the
    // next cook is told about an injury that has not happened.
    this.wordEl.textContent = '';
    this.wordEl.style.color = '';
    this.askEl.textContent = askText;
    this.cardEl.textContent = cardText;
    this.hintEl.textContent = 'WHEEL — flame · SPACE — basket in / out to the rack · keep your HAND off the pot when it spits · ENTER serves';
  }

  enter(): void {
    this.prevBg = this.app.scene.background;
    this.app.scene.background = this.bgTex;
    this.panel.show();
  }
  exit(): void {
    this.app.scene.background = this.prevBg as never;
    this.panel.hide();
  }

  update(dt: number): void {
    this.app.camera.position.set(0, 3.3, 3.6);
    this.app.camera.lookAt(-0.4, POT_Y, 0);
    const s = this.session;
    if (!s) return;
    const inp = this.app.input;

    if (inp.wheel !== 0) setOilKnob(s, Math.round(s.knob) + (inp.wheel > 0 ? 1 : -1));
    if (inp.justPressed('Space')) {
      basket(s, !s.basketIn);
      audio.clatter(0.5, s.basketIn ? 0.7 : 1.1);
    }

    // The hand: pointer projected onto the pot's mouth.
    this.ray.setFromCamera(inp.ndc, this.app.camera);
    const on = this.ray.ray.intersectPlane(this.plane, this.hit);
    const handOverPot = !!on && Math.hypot(this.hit.x, this.hit.z) < POT_R * 1.25;

    fryerPotStep(s, dt, handOverPot);

    // Spit events arrive from the sim as counters — flash and sting here.
    if (s.spits > this.lastSpits) {
      this.lastSpits = s.spits;
      audio.clatter(0.9, 2.2);
      const fl = new THREE.Mesh(
        new THREE.SphereGeometry(0.05, 6, 5),
        new THREE.MeshBasicMaterial({ color: 0xffd27a }),
      );
      const a = Math.random() * Math.PI * 2;
      fl.position.set(Math.cos(a) * POT_R * 0.7, POT_Y + 0.3, Math.sin(a) * POT_R * 0.7);
      this.root.add(fl);
      this.spitFlashes.push({ m: fl, t: 0.5 });
    }
    if (s.burns > this.lastBurns) {
      this.lastBurns = s.burns;
      audio.fart(s.burns * 3 + 1); // the yelp, in the house voice
      eye.mood('horrified', 3);
      this.wordEl.textContent = 'it CAUGHT you — the hand was over the pot';
      this.wordEl.style.color = '#e2603a';
    }

    // Foley: the oil's own bed — bubbles rise with temp, frying adds sizzle.
    const oilN = s.oil / 10;
    audio.bed('oil', 0.015 + oilN * 0.05, 220 + oilN * 420, 0.6, 0.5 + oilN * 0.4);
    if (s.basketIn) audio.bed('sizzle', 0.05 + oilN * 0.09, 4600, 0.8, 0.9);
    else audio.bed('sizzle', 0, 4600);
    if (s.oil > SPIT_AT && Math.random() < 3 * dt) audio.blip(oilN);

    this.syncVisuals(dt);
    this.updateHud();

    if (inp.justPressed('Enter') && !s.basketIn && s.fries > 0) {
      audio.bed('oil', 0, 300);
      audio.bed('sizzle', 0, 4600);
      const cb = this.onDone;
      this.onDone = null;
      cb?.(fryerPotResult(s));
    }
  }

  private syncVisuals(dt: number): void {
    const s = this.session!;
    const oilN = s.oil / 10;
    const fm = this.flame.material as THREE.MeshBasicMaterial;
    fm.opacity = Math.min(0.85, s.knob / 9);
    this.flame.scale.y = 0.5 + (s.knob / 9) * 1.1;
    // The oil: pale gold cold, darker and livelier hot; shimmer past blanch.
    const om = this.oilSurf.material as THREE.MeshStandardMaterial;
    om.color.setHex(0xc9a23a).lerp(new THREE.Color(0x7a5a18), oilN);
    this.oilSurf.position.y = POT_Y + 0.12 + (s.oil > BLANCH_LO ? Math.sin(s.seconds * (s.oil > GOLD_AT ? 14 : 7)) * 0.008 : 0);

    // The basket travels: rack (out) ⇄ pot (in).
    const target = s.basketIn ? { x: 0, y: POT_Y + 0.05 } : { x: -2.5, y: 0.62 };
    this.basketGrp.position.x += (target.x - this.basketGrp.position.x) * (1 - Math.exp(-dt / 0.08));
    this.basketGrp.position.y += (target.y - this.basketGrp.position.y) * (1 - Math.exp(-dt / 0.08));
    this.basketGrp.position.z = s.basketIn ? 0 : 0.6;

    for (let i = 0; i < this.chipMeshes.length; i++) {
      const c = s.chips[i];
      const m = this.chipMeshes[i];
      const ang = (i / this.chipMeshes.length) * Math.PI * 2;
      const r = 0.3 + (i % 3) * 0.09;
      m.position.set(
        this.basketGrp.position.x + Math.cos(ang) * r,
        this.basketGrp.position.y + 0.1 + (i % 2) * 0.06,
        this.basketGrp.position.z + Math.sin(ang) * r,
      );
      m.rotation.y = ang * 2;
      const col = new THREE.Color(0xf2e6c4).lerp(new THREE.Color(0x8a5a1e), Math.min(1, c.gold * 1.2));
      if (c.gold > 0.85) col.lerp(new THREE.Color(0x2a1c10), (c.gold - 0.85) * 5);
      col.lerp(new THREE.Color(0xb8a878), c.grease * 0.5); // greasy = sad sheen
      (m.material as THREE.MeshStandardMaterial).color = col;
    }

    for (const f of [...this.spitFlashes]) {
      f.t -= dt;
      f.m.position.y += dt * 2.2;
      (f.m.material as THREE.MeshBasicMaterial).color.setHex(f.t > 0.25 ? 0xffd27a : 0xa86a2a);
      if (f.t <= 0) {
        this.root.remove(f.m);
        this.spitFlashes.splice(this.spitFlashes.indexOf(f), 1);
      }
    }
  }

  private updateHud(): void {
    const s = this.session!;
    this.stateEl.textContent = `flame ${Math.round(s.knob)} · fry №${s.fries}${s.basketIn ? ' — basket DOWN' : s.fries > 0 ? ' — on the rack' : ''} · inside ${Math.round(meanCooked(s) * 100)}% · colour ${Math.round(meanGold(s) * 100)}%${s.spits ? ` · ${s.spits} spits` : ''}${s.burns ? ` · ${s.burns} CAUGHT you` : ''}`;
    if (!this.wordEl.textContent?.includes('CAUGHT')) {
      this.wordEl.textContent = `${oilWord(s)} · ${chipWord(s)}`;
      this.wordEl.style.color = '';
    }
  }

  result(): ReturnType<typeof fryerPotResult> {
    return fryerPotResult(this.session!);
  }
}