import * as THREE from 'three';
import type { App, View } from '../core/app';
import { audio } from '../core/audio';
import { eye } from '../ui/eye';
import {
  type PoachSession,
  newPoachSession,
  setPotKnob,
  swirl,
  dropEgg,
  liftEgg,
  drainStep,
  poachStep,
  poachResult,
  waterWord,
  SHIVER_LO,
  SHIVER_HI,
  BOIL_AT,
  WHITE_SET,
  YOLK_TREMBLE,
} from '../sim/poach';
import { el, Panel } from '../ui/hud';
import { loadBackdrop } from './props';
import { loadProp } from './assets';

const POT_Y = 0.55;
const POT_R = 1.15;

/**
 * THE POACH POT — the vortex, the shiver, the drop, the lift.
 *
 * WHEEL sets the flame (the water answers on the fuel's lag — watch for the
 * SHIVER, not a thermometer). DRAG CIRCLES over the pot to spin the vortex —
 * it decays, so swirl then drop, not swirl then admire. SPACE drops the egg
 * into the eye. Wait for the white to gather and set. L lifts it onto the
 * spoon; HOLD it there to drain. ENTER serves — and he WILL press it.
 */
export class PoachView implements View {
  readonly root = new THREE.Group();

  private session: PoachSession | null = null;
  private flame!: THREE.Mesh;
  private water!: THREE.Mesh;
  private streaks: THREE.Line[] = [];
  private streakAngle = 0;
  private bubbles: THREE.Mesh[] = [];
  private eggWhite!: THREE.Mesh;
  private eggYolk!: THREE.Mesh;
  private ragBits: THREE.Mesh[] = [];
  private spoon!: THREE.Group;

  private ray = new THREE.Raycaster();
  private hit = new THREE.Vector3();
  private plane = new THREE.Plane(new THREE.Vector3(0, 1, 0), -(POT_Y + 0.12));
  private lastAngle: number | null = null;

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

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

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

  constructor(private app: App) {
    this.buildScenery();
    this.panel = new Panel('poach-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, 'POACH IT');
    this.askEl = el('div', 'slicer-ask', 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);

    // Burner + flame under the pot (the pan's grammar).
    const burner = new THREE.Mesh(
      new THREE.CylinderGeometry(0.85, 0.95, 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(0.65, 0.45, 20),
      new THREE.MeshBasicMaterial({ color: 0x3a7bff, transparent: true, opacity: 0 }),
    );
    this.flame.position.y = 0.32;
    this.root.add(this.flame);

    // The pot.
    const pot = new THREE.Mesh(
      new THREE.CylinderGeometry(POT_R, POT_R * 0.92, 0.75, 32, 1, true),
      new THREE.MeshStandardMaterial({ color: 0x8a8f94, roughness: 0.35, metalness: 0.7, side: THREE.DoubleSide }),
    );
    pot.position.y = POT_Y - 0.05;
    this.root.add(pot);
    this.water = new THREE.Mesh(
      new THREE.CylinderGeometry(POT_R * 0.93, POT_R * 0.93, 0.06, 32),
      new THREE.MeshStandardMaterial({ color: 0x7fa8bc, roughness: 0.2, transparent: true, opacity: 0.75 }),
    );
    this.water.position.y = POT_Y + 0.1;
    this.root.add(this.water);

    // Vortex streaks: arcs that spin with the swirl.
    const streakMat = new THREE.LineBasicMaterial({ color: 0xd8ecf4, transparent: true, opacity: 0.0 });
    for (let i = 0; i < 3; i++) {
      const pts: THREE.Vector3[] = [];
      const r = POT_R * (0.35 + i * 0.2);
      for (let a = 0; a <= 20; a++) {
        const th = (a / 20) * Math.PI * 1.1;
        pts.push(new THREE.Vector3(Math.cos(th) * r, POT_Y + 0.14, Math.sin(th) * r));
      }
      const line = new THREE.Line(new THREE.BufferGeometry().setFromPoints(pts), streakMat);
      this.streaks.push(line);
      this.root.add(line);
    }

    // Shiver/boil bubbles.
    for (let i = 0; i < 10; i++) {
      const b = new THREE.Mesh(
        new THREE.SphereGeometry(0.035, 8, 6),
        new THREE.MeshBasicMaterial({ color: 0xeef6fa, transparent: true, opacity: 0 }),
      );
      b.position.set((Math.random() - 0.5) * POT_R * 1.4, POT_Y + 0.14, (Math.random() - 0.5) * POT_R * 1.4);
      this.bubbles.push(b);
      this.root.add(b);
    }

    // The egg: a white comet + a yolk, hidden until the drop.
    this.eggWhite = new THREE.Mesh(
      new THREE.SphereGeometry(0.3, 16, 12),
      new THREE.MeshStandardMaterial({ color: 0xf2efe6, roughness: 0.5, transparent: true, opacity: 0.65 }),
    );
    this.eggWhite.scale.set(1.25, 0.5, 1.1);
    this.eggWhite.position.set(0, POT_Y + 0.12, 0);
    this.eggWhite.visible = false;
    this.root.add(this.eggWhite);
    this.eggYolk = new THREE.Mesh(
      new THREE.SphereGeometry(0.14, 14, 10),
      new THREE.MeshStandardMaterial({ color: 0xf0b428, roughness: 0.45 }),
    );
    this.eggYolk.scale.set(1, 0.65, 1);
    this.eggYolk.position.set(0, POT_Y + 0.16, 0);
    this.eggYolk.visible = false;
    this.root.add(this.eggYolk);

    // The slotted spoon, arriving at the lift.
    this.spoon = new THREE.Group();
    const bowl = new THREE.Mesh(
      new THREE.SphereGeometry(0.38, 16, 10, 0, Math.PI * 2, 0, Math.PI / 2.4),
      new THREE.MeshStandardMaterial({ color: 0xb8bcc0, roughness: 0.4, metalness: 0.7, side: THREE.DoubleSide }),
    );
    bowl.rotation.x = Math.PI;
    const handle = new THREE.Mesh(
      new THREE.BoxGeometry(1.3, 0.05, 0.1),
      new THREE.MeshStandardMaterial({ color: 0xb8bcc0, roughness: 0.4, metalness: 0.7 }),
    );
    handle.position.set(0.85, 0.12, 0);
    this.spoon.add(bowl, handle);
    this.spoon.visible = false;
    this.root.add(this.spoon);
    // The real spoon rides INSIDE the group, so it inherits every move the
    // lift animation makes; the procedural bowl+handle step aside.
    void loadProp('/assets/models/slotted_spoon.glb', 1.9)
      .then((prop) => {
        // Measured, not guessed: the model is ~1.9 long in Z with the bowl at
        // the +Z end, so it needs shifting back by half its length to put the
        // BOWL — not the model's centre — under the egg.
        prop.position.set(0, -0.14, -0.92);
        bowl.visible = false;
        handle.visible = false;
        this.spoon.add(prop);
      })
      .catch(() => undefined);
  }

  /** A fresh pot on `fuel`, cold water, no egg. */
  reset(fuel = 'gas', askText = 'one poached egg — white set, yolk trembling'): void {
    this.session = newPoachSession(fuel);
    this.lastAngle = null;
    this.eggWhite.visible = false;
    this.eggYolk.visible = false;
    this.spoon.visible = false;
    for (const r of this.ragBits) this.root.remove(r);
    this.ragBits = [];
    this.askEl.textContent = askText;
    this.hintEl.textContent = 'WHEEL — flame · DRAG CIRCLES — spin the vortex · SPACE — drop · L — lift · hold to drain · 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, 3.6, 3.1);
    this.app.camera.lookAt(0, POT_Y, 0);
    const s = this.session;
    if (!s) return;
    const inp = this.app.input;

    if (inp.wheel !== 0) {
      const k = Math.max(0, Math.min(9, Math.round(s.src.target) + (inp.wheel > 0 ? 1 : -1)));
      setPotKnob(s, k);
    }

    // Circular drag over the pot = the swirl (angular sweep around the centre).
    this.ray.setFromCamera(inp.ndc, this.app.camera);
    const on = this.ray.ray.intersectPlane(this.plane, this.hit);
    if (inp.down && on && Math.hypot(this.hit.x, this.hit.z) < POT_R * 1.15) {
      const ang = Math.atan2(this.hit.z, this.hit.x);
      if (this.lastAngle !== null) {
        let d = ang - this.lastAngle;
        if (d > Math.PI) d -= Math.PI * 2;
        if (d < -Math.PI) d += Math.PI * 2;
        swirl(s, d);
        if (Math.abs(d) > 0.02 && !s.dropped) audio.scrape(0.3, Math.abs(d) * 3);
      }
      this.lastAngle = ang;
    } else {
      this.lastAngle = null;
    }

    if (inp.justPressed('Space') && !s.dropped) {
      dropEgg(s, 0);
      this.eggWhite.visible = true;
      this.eggYolk.visible = true;
      audio.clatter(0.4, 0.9);
      eye.mood(s.rags > 0.25 ? 'disappointed' : 'intrigued', 2);
      // Rags appear immediately if the drop was bad.
      this.spawnRags(s.rags);
    }
    if (inp.justPressed('KeyL') && s.dropped && !s.lifted) {
      liftEgg(s);
      this.spoon.visible = true;
      audio.clunk(true);
      this.hintEl.textContent = 'hold it on the spoon — let it DRAIN · ENTER serves';
    }
    if (s.lifted) drainStep(s, dt);

    poachStep(s, dt);
    // The pot narrates its own temperature: a low rumble that thickens as the
    // water climbs, and bubbles that go from shy blips to a rolling argument.
    const t01 = Math.min(1, s.src.output / 10);
    audio.bed('water', 0.02 + t01 * 0.05, 260 + t01 * 480, 0.6, 0.45 + t01 * 0.2);
    const bps = s.src.output > BOIL_AT ? 13 : s.src.output >= SHIVER_LO ? 3 : s.src.output > 4 ? 1.2 : 0.15;
    if (Math.random() < bps * dt) audio.blip(t01);
    // A rolling boil with an egg in it: he can see the white tearing from here.
    if (s.dropped && !s.lifted && s.src.output > BOIL_AT) eye.mood('disappointed', 0.8);
    this.syncVisuals(dt);
    this.updateHud();

    if (inp.justPressed('Enter') && s.dropped) {
      const cb = this.onDone;
      this.onDone = null;
      cb?.(poachResult(s));
    }
  }

  private spawnRags(rags: number): void {
    const n = Math.round(rags * 6);
    for (let i = this.ragBits.length; i < n; i++) {
      const bit = new THREE.Mesh(
        new THREE.SphereGeometry(0.07 + Math.random() * 0.06, 8, 6),
        new THREE.MeshStandardMaterial({ color: 0xf0ece0, roughness: 0.6, transparent: true, opacity: 0.7 }),
      );
      const a = Math.random() * Math.PI * 2;
      const r = POT_R * (0.4 + Math.random() * 0.45);
      bit.scale.y = 0.4;
      bit.position.set(Math.cos(a) * r, POT_Y + 0.12, Math.sin(a) * r);
      this.ragBits.push(bit);
      this.root.add(bit);
    }
  }

  private syncVisuals(dt: number): void {
    const s = this.session!;
    const t = s.src.output;
    // Flame answers the knob.
    const fm = this.flame.material as THREE.MeshBasicMaterial;
    fm.opacity = s.src.flame ? Math.min(0.8, t / 10) : 0;
    this.flame.scale.y = 0.5 + t / 9;

    // Vortex streaks spin with the swirl and fade with it.
    this.streakAngle += s.vortex * dt * 7;
    const sm = this.streaks[0].material as THREE.LineBasicMaterial;
    sm.opacity = Math.min(0.85, s.vortex * 1.1);
    this.streaks.forEach((line, i) => {
      line.rotation.y = this.streakAngle * (1 + i * 0.15);
    });

    // Bubbles: none when still, a shy shiver in band, a jitterbug at boil.
    const inBand = t >= SHIVER_LO && t <= SHIVER_HI;
    const boiling = t > BOIL_AT;
    for (const b of this.bubbles) {
      const bm = b.material as THREE.MeshBasicMaterial;
      bm.opacity = boiling ? 0.85 : inBand ? 0.35 : t > 4 ? 0.12 : 0;
      if (boiling) b.position.y = POT_Y + 0.14 + Math.abs(Math.sin(s.seconds * 9 + b.position.x * 7)) * 0.09;
      else b.position.y = POT_Y + 0.14 + (inBand ? Math.abs(Math.sin(s.seconds * 3.5 + b.position.z * 5)) * 0.02 : 0);
    }

    // The egg gathers as it sets: opacity and tightness track whiteSet; it rides
    // the vortex; the spoon lifts it clear.
    if (s.dropped) {
      const em = this.eggWhite.material as THREE.MeshStandardMaterial;
      em.opacity = 0.45 + s.whiteSet * 0.55;
      const gather = 1.35 - s.whiteSet * 0.35 + s.rags * 0.3;
      this.eggWhite.scale.set(gather, 0.5 + s.whiteSet * 0.12, gather * 0.9);
      const ym = this.eggYolk.material as THREE.MeshStandardMaterial;
      ym.color.setHex(s.yolkSet > 0.6 ? 0xd8c26a : 0xf0b428); // a hard yolk goes pale
      const y = s.lifted ? POT_Y + 0.55 : POT_Y + 0.12;
      this.eggWhite.position.set(0, y, 0);
      this.eggYolk.position.set(0, y + 0.05, 0);
      if (!s.lifted) {
        this.eggWhite.rotation.y += s.vortex * dt * 4;
      } else {
        this.spoon.position.set(0, POT_Y + 0.42, 0);
        // Drips while it drains.
        this.eggWhite.position.y = POT_Y + 0.55;
      }
    }
  }

  private updateHud(): void {
    const s = this.session!;
    const r = poachResult(s);
    const vortexWord = s.vortex > 0.6 ? 'spinning hard' : s.vortex > 0.25 ? 'a lazy spin' : 'still';
    this.stateEl.textContent = `flame ${Math.round(s.src.target)} · ${waterWord(s)} · water: ${vortexWord}`;
    if (!s.dropped) {
      this.wordEl.textContent = s.vortex > 0.5 && s.src.output >= SHIVER_LO && s.src.output <= SHIVER_HI ? 'NOW — drop it in the eye' : '';
      this.wordEl.style.color = '#8fce8f';
    } else if (!s.lifted) {
      const word = s.whiteSet < 0.55 ? 'the white is gathering…' : s.whiteSet < WHITE_SET ? 'nearly set…' : s.yolkSet <= YOLK_TREMBLE ? 'SET — lift it NOW (L)' : 'it is overstaying';
      this.wordEl.textContent = word;
      this.wordEl.style.color = s.whiteSet >= WHITE_SET && s.yolkSet <= YOLK_TREMBLE ? '#8fce8f' : s.yolkSet > YOLK_TREMBLE ? '#e2603a' : '';
    } else {
      this.wordEl.textContent = s.cling > 0.3 ? 'draining…' : `drained — serve it. ${r.wobbleWord}`;
      this.wordEl.style.color = s.cling > 0.3 ? '' : '#8fce8f';
    }
  }

  result() {
    return this.session
      ? poachResult(this.session)
      : { whiteScore: 0, yolkScore: 0, formScore: 0, drainScore: 0, whiteSet: 0, yolkSet: 0, rags: 0, cling: 1, vortexAtDrop: 0, wobbleWord: 'there is no egg' };
  }

  dispose(): void {
    this.panel.dispose();
  }
}