/**
 * Droid-speak captions: turn a phrase's unit-class sequence into text, the
 * way a protocol droid would transcribe it. Deterministic per (classes, seed).
 * This is the placeholder for the future droid-speak language model.
 */

import type { VoiceMode } from "./emotions.generated.js";

export type UnitClass = "rise" | "fall" | "flat" | "trill" | "warble" | "blat";

const WORDS: Record<UnitClass, string[]> = {
  rise: ["bweep", "wheep", "brdee", "vwee"],
  fall: ["boo", "bwoop", "dwoo", "vhoom"],
  flat: ["beep", "bip", "dit", "bop"],
  trill: ["brrrt", "drrrr", "trrri", "prrp"],
  warble: ["wooble", "wawoo", "oowee", "wubwub"],
  blat: ["bzzt", "grzzk", "blat", "vrrk"],
};

const ENDINGS: Record<VoiceMode, string> = {
  ramble: ".",
  curious: "?",
  happy: "!",
  excited: "!",
  sad: "…",
  scared: "!",
  angry: "!!",
  sleepy: "…",
  affirmative: "!",
  negative: ".",
  surprised: "!",
  confused: "?",
};

function hash(seed: number, i: number): number {
  let h = (seed ^ Math.imul(i + 1, 2654435761)) >>> 0;
  h = Math.imul(h ^ (h >>> 13), 0x5bd1e995) >>> 0;
  return (h ^ (h >>> 15)) >>> 0;
}

export function droidText(classes: UnitClass[], voice: VoiceMode, seed: number): string {
  const words = classes.map((cls, i) => {
    const options = WORDS[cls];
    const word = options[hash(seed, i) % options.length] ?? "beep";
    // repeated classes read as a stutter: "bip-bip"
    return classes[i - 1] === cls && hash(seed, i) % 3 === 0 ? `${word}-${word}` : word;
  });
  const ending = ENDINGS[voice];
  return words.join(" ") + ending;
}