import * as THREE from 'three';
import type { App } from './core/app';
import { JuiceView } from './scenes/juice';
import type { JuicerId } from './sim/juicing';

/**
 * Juice-station dev harness — a SEPARATE installer from dev.ts so the two lanes
 * don't collide. It owns its own JuiceView (the game doesn't route orders here
 * yet — that's the game lane's job), adds it to the scene, and drives the real
 * input path: real pointer circles around the reamer for the twist, `press`
 * injected the way dev.ts injects kitchen.power.
 *
 * The reviewer verifies with a couple of calls, e.g.
 *   __tj.enter({ seeds: 5 }); __tj.twist(3, 0.7); __tj.stats()
 *   __tj.enter({ juicer: 'ribbed_deluxe', seeds: 5 }); __tj.twist(3, 0.95); __tj.stats()
 *   __tj.enter({ offset: 0.2 }); __tj.twist(6, 0.7); __tj.stats()   // capped yield
 *   __tj.enter(); __tj.mash(1.0, 0.9); __tj.stats()                 // tearing + spray
 *
 * Dev builds only.
 */
export function installJuiceHarness(app: App): void {
  const view = new JuiceView(app);
  app.scene.add(view.root);
  // Hidden until __tj.enter() makes it the active view — otherwise it renders
  // on top of whatever the game is showing at startup.
  view.root.visible = false;
  const sessionOf = () =>
    (view as unknown as {
      session: {
        placed: boolean;
        extracted: number;
        theoretical: number;
        pulp: number;
        bitterness: number;
        seedsTotal: number;
        seedsReleased: number;
        seedsCaught: number;
        seedsInGlass: number;
        revolutions: number;
      } | null;
    }).session;

  const v = new THREE.Vector3();
  const point = (x: number, y: number, z: number, down: boolean) => {
    v.set(x, y, z).project(app.camera);
    app.input.ndc.set(v.x, v.y);
    app.input.down = down;
  };
  const run = (frames: number, dt = 1 / 60) => {
    for (let i = 0; i < frames; i++) app.step(dt);
  };

  const CONE_TOP = 0.92;
  const R = 0.3;

  const harness = {
    app,
    view,
    THREE,
    run,
    point,

    /** Reset the station and make it the active view. */
    enter(
      opts: { juicer?: JuicerId; offset?: number; wedge?: number; seeds?: number } = {},
    ) {
      const { juicer = 'pyramid_classic', offset = 0, wedge = 0, seeds } = opts;
      view.reset(juicer, { offset, wedge }, `juice the orange (${juicer})`, seeds);
      app.setView(view);
      run(3); // let the view take the camera before we project points
      return harness.place();
    },

    /** Seat the half on the cone (the drag's commit). */
    place() {
      view.placeHalf();
      run(1);
      return harness.stats();
    },

    /**
     * Press-and-twist for `revolutions` turns at a fixed `pressure` (0..1).
     * `dir` +1/-1 sets the twist direction. Press is injected; the twist itself
     * is real pointer motion around the cone, so the sim sees exactly what a
     * hand would produce.
     */
    twist(revolutions = 3, pressure = 0.7, dir: 1 | -1 = 1) {
      view.autoPress = false;
      view.press = pressure;
      const steps = Math.max(1, Math.round(revolutions * 48));
      for (let i = 0; i <= steps; i++) {
        const a = dir * (i / 48) * Math.PI * 2;
        point(Math.cos(a) * R, CONE_TOP, Math.sin(a) * R, true);
        run(1);
      }
      app.input.down = false;
      run(1);
      return harness.stats();
    },

    /**
     * Work the wrist: `reversals` back-and-forth half-turns. This is what earns
     * the reversal bonus bites — the number to watch is extracted climbing a
     * touch faster than the same sweep in one direction.
     */
    wristle(reversals = 6, pressure = 0.7) {
      view.autoPress = false;
      view.press = pressure;
      // One running angle so each reversal continues smoothly from the last —
      // no position jump, so the sim sees a clean back-and-forth wrist.
      let ang = 0;
      let dir: 1 | -1 = 1;
      for (let r = 0; r < reversals; r++) {
        for (let i = 0; i < 24; i++) {
          ang += dir * (Math.PI / 24); // a smooth half-turn
          point(Math.cos(ang) * R, CONE_TOP, Math.sin(ang) * R, true);
          run(1);
        }
        dir = (dir === 1 ? -1 : 1) as 1 | -1;
      }
      app.input.down = false;
      run(1);
      return harness.stats();
    },

    /**
     * Lean without twisting — hold `pressure` on the cone for `seconds` and go
     * nowhere. This is the mash: it should tear pulp and spray the bench, not
     * fill the glass.
     */
    mash(seconds = 1, pressure = 0.9) {
      view.autoPress = false;
      view.press = pressure;
      const frames = Math.round(seconds * 60);
      for (let i = 0; i < frames; i++) {
        point(R, CONE_TOP, 0, true); // fixed point → zero sweep
        run(1);
      }
      app.input.down = false;
      run(1);
      return harness.stats();
    },

    /** Fish one pip out of the glass (costs the player service time in play). */
    fish() {
      view.fishOnePip();
      run(1);
      return harness.stats();
    },

    /** Everything the judge and the readouts will read. */
    stats() {
      const s = sessionOf();
      const r = view.result();
      const round = (n: number) => +n.toFixed(3);
      return {
        placed: s?.placed ?? false,
        yieldOfOrange: round(r.yieldOfOrange),
        yieldOfReachable: round(r.yieldOfReachable),
        theoretical: round(r.theoretical),
        extracted: round(r.extracted),
        pips: r.pips,
        seedsCaught: r.seedsCaught,
        seedsReleased: s?.seedsReleased ?? 0,
        seedsTotal: s?.seedsTotal ?? 0,
        bitterness: round(r.bitterness),
        pulp: round(r.pulp),
        revolutions: round(s?.revolutions ?? 0),
        bench: {
          mass: round(r.bench?.mass ?? 0),
          spreadFrac: round(r.bench?.spreadFrac ?? 0),
          solids: r.bench?.solids ?? 0,
        },
        benchWord: view.mess.benchWord(),
        juicer: r.juicerName,
      };
    },

    /** Move the camera for a screenshot without disturbing the sim. */
    look(pos: [number, number, number], at: [number, number, number]) {
      app.camera.position.set(...pos);
      app.camera.lookAt(new THREE.Vector3(...at));
      app.renderer.render(app.scene, app.camera);
    },
  };

  (window as unknown as { __tj: unknown }).__tj = harness;
}