import { type HeatSource, newHeatSource, setKnob, heatStep } from './heatsource';

/**
 * THE POACH — almost a whole game, and treated like one.
 *
 * Four acts, none skippable:
 *
 *   THE WATER — the pot chases the knob on the fuel's lag (the heat-source
 *          bone). The poach wants the SHIVER — that band where the surface
 *          trembles but nothing rolls. Too cool and the white disperses into
 *          rags; a rolling boil and it tears the egg apart while it cooks.
 *   THE VORTEX — swirl the water first. A good vortex wraps the white around
 *          the yolk as it lands; drop into still water and the white walks off
 *          on its own. The vortex DECAYS — swirl, then drop, not swirl and
 *          admire.
 *   THE DROP — from low, into the eye of the spin. Height splats it.
 *   THE SET — white sets first, then the yolk starts to firm. Lift when the
 *          white is set and the yolk still trembles; every second past that is
 *          a second toward a boiled egg in disguise. Then DRAIN it on the
 *          spoon — nobody wants poach water on the plate.
 *
 * The wobble test at the pass reads yolkSet: the judge presses it, on camera.
 * "It should tremble. Like you, right now."
 *
 * Pure — no three.js — the harness poaches headless.
 */

/** The shiver: where a poach wants the water. Above BOIL it tears. */
export const SHIVER_LO = 5.8;
export const SHIVER_HI = 7.4;
export const BOIL_AT = 8.2;

/** White is SET past here (snotty below ~0.6). */
export const WHITE_SET = 0.85;
/** Yolk still trembles below here; past it you've boiled an egg in disguise. */
export const YOLK_TREMBLE = 0.35;

/** How fast the vortex dies once you stop stirring. */
const VORTEX_DECAY = 0.09;

export interface PoachSession {
  src: HeatSource;
  /** Vortex strength 0..1 — built by swirling, decays on its own. */
  vortex: number;
  dropped: boolean;
  lifted: boolean;
  /** 0 raw .. 1 fully set. */
  whiteSet: number;
  /** 0 liquid .. 1 hard. The wobble test reads this. */
  yolkSet: number;
  /** White lost to rags — still water, a high drop, or a rolling boil. */
  rags: number;
  /** Poach water still clinging — drain on the spoon before the pass. */
  cling: number;
  /** Vortex strength at the moment of the drop (the judged number). */
  vortexAtDrop: number;
  tempAtDrop: number;
  seconds: number;
}

export function newPoachSession(fuel = 'gas'): PoachSession {
  return {
    src: newHeatSource(fuel),
    vortex: 0,
    dropped: false,
    lifted: false,
    whiteSet: 0,
    yolkSet: 0,
    rags: 0,
    cling: 1,
    vortexAtDrop: 0,
    tempAtDrop: 0,
    seconds: 0,
  };
}

export function setPotKnob(s: PoachSession, k: number): void {
  setKnob(s.src, k);
}

/** Stir: add angular sweep (radians this frame) into the vortex. */
export function swirl(s: PoachSession, sweep: number): void {
  if (s.dropped) {
    // Stirring a dropped egg is vandalism — it rags the white directly.
    s.rags = Math.min(1, s.rags + Math.abs(sweep) * 0.06);
    return;
  }
  s.vortex = Math.min(1, s.vortex + Math.abs(sweep) * 0.055);
}

/**
 * Drop the egg from `height` (0 rim-low .. 1 show-off). The vortex catches the
 * white; still water and altitude both cost you form, immediately.
 */
export function dropEgg(s: PoachSession, height = 0): void {
  if (s.dropped) return;
  s.dropped = true;
  s.vortexAtDrop = s.vortex;
  s.tempAtDrop = s.src.output;
  s.rags = Math.min(1, s.rags + (1 - s.vortex) * 0.45 + height * 0.4);
  // Cold water at the drop lets the white walk before any heat can catch it.
  if (s.src.output < SHIVER_LO) s.rags = Math.min(1, s.rags + (SHIVER_LO - s.src.output) * 0.12);
}

/** Lift it out on the spoon. The set stops; the drain begins. */
export function liftEgg(s: PoachSession): void {
  if (s.dropped) s.lifted = true;
}

/** Hold it on the spoon: cling drains away. Patience, again. */
export function drainStep(s: PoachSession, dt: number): void {
  if (s.lifted) s.cling = Math.max(0, s.cling - dt / 4);
}

export function poachStep(s: PoachSession, dt: number): void {
  heatStep(s.src, dt);
  s.vortex = Math.max(0, s.vortex - VORTEX_DECAY * dt);
  const t = s.src.output;
  if (s.dropped && !s.lifted) {
    // The white sets fastest in the shiver; cooler is slower (and it rags on
    // the way in); a boil sets it fast but TEARS it the whole time.
    const inBand = t >= SHIVER_LO && t <= SHIVER_HI;
    const rate = inBand ? 0.055 : t > SHIVER_HI ? 0.07 : t > 4 ? 0.03 : 0.012;
    s.whiteSet = Math.min(1, s.whiteSet + rate * dt);
    if (t > BOIL_AT) s.rags = Math.min(1, s.rags + (t - BOIL_AT) * 0.045 * dt);
    // The yolk only starts once the white is mostly there.
    if (s.whiteSet > 0.75) s.yolkSet = Math.min(1, s.yolkSet + 0.035 * (inBand ? 1 : 1.4) * dt);
  }
  s.seconds += dt;
}

export interface PoachResult {
  /** Set, not snotty. */
  whiteScore: number;
  /** The wobble: liquid yolk full marks, hard yolk none. */
  yolkScore: number;
  /** One neat comet, not a pot of rags. */
  formScore: number;
  /** Drained on the spoon, or served with its own puddle. */
  drainScore: number;
  whiteSet: number;
  yolkSet: number;
  rags: number;
  cling: number;
  vortexAtDrop: number;
  wobbleWord: string;
}

const clamp01 = (v: number) => (v < 0 ? 0 : v > 1 ? 1 : v);

export function poachResult(s: PoachSession): PoachResult {
  const whiteScore = !s.dropped ? 0 : clamp01((s.whiteSet - 0.55) / (WHITE_SET - 0.55));
  const yolkScore = !s.dropped ? 0 : clamp01(1 - Math.max(0, s.yolkSet - YOLK_TREMBLE) / 0.4);
  const formScore = clamp01(1 - s.rags * 1.3);
  const drainScore = clamp01(1 - s.cling * 0.9);
  const wobbleWord =
    !s.dropped ? 'there is no egg'
    : s.yolkSet < 0.15 && s.whiteSet < WHITE_SET ? 'it collapses — raw inside'
    : s.yolkSet <= YOLK_TREMBLE ? 'it TREMBLES — perfect'
    : s.yolkSet < 0.6 ? 'a stiff little nod'
    : 'it does not move at all';
  return {
    whiteScore,
    yolkScore,
    formScore,
    drainScore,
    whiteSet: s.whiteSet,
    yolkSet: s.yolkSet,
    rags: s.rags,
    cling: s.cling,
    vortexAtDrop: s.vortexAtDrop,
    wobbleWord,
  };
}

/** The water's diegetic tell — never a thermometer. */
export function waterWord(s: PoachSession): string {
  const t = s.src.output;
  if (t < 3) return 'still water';
  if (t < SHIVER_LO) return 'warming — not yet';
  if (t <= SHIVER_HI) return 'a gentle SHIVER — now';
  if (t <= BOIL_AT) return 'simmering hard';
  return 'ROLLING — it will tear';
}