Displacement chains

displacements.ts

// qwerty to engram
const displacements = {
  "`": "[",
  "-": "]",
  "=": "/",
  q: "b",
  w: "y",
  e: "o",
  r: "u",
  t: "'",
  y: '"',
  u: "l",
  i: "d",
  o: "w",
  p: "v",
  "[": "z",
  "]": "#",
  "|": "@",
  a: "c",
  s: "i",
  d: "e",
  f: "a",
  g: ",",
  h: ".",
  j: "h",
  k: "t",
  l: "s",
  ";": "n",
  "'": "q",
  z: "g",
  x: "x",
  c: "j",
  v: "k",
  b: "-",
  n: "?",
  m: "r",
  ",": "m",
  ".": "f",
  "/": "p",
  "~": "{",
  "!": "|",
  "@": "=",
  "#": "~",
  $: "+",
  "%": "<",
  "^": ">",
  "&": "^",
  "*": "&",
  "(": "%",
  ")": "*",
  _: "}",
  "+": "\\",
  T: "(",
  Y: ")",
  "{": "Z",
  "}": "$",
  "\\": "`",
  G: ";",
  H: ":",
  ":": "N",
  '"': "Q",
  B: "_",
  N: "!",
};

// engram to qwerty
const replacements = Object.keys(displacements).reduce((previousValue, currentValue) => {
  if (currentValue in displacements) {
    const replacement = displacements[currentValue as keyof typeof displacements];
    if (previousValue[replacement]) {
      throw new Error('Duplicate value found: ' + replacement)
    }
    previousValue[replacement] = currentValue;
    return previousValue
  }
  return previousValue
}, {} as unknown as any);

// console.log({ displacements, replacements })

function confusionChain(qwerty: string): string {
  if (qwerty.length !== 1) {
    throw new Error("Only one character is allowed");
  }

  let originKey = qwerty;

  if (!(originKey in replacements)) {
    originKey = /[A-Z]/.test(originKey) ? originKey.toLowerCase() : originKey.toUpperCase();
  }

  return displacements[originKey as keyof typeof displacements] + originKey + replacements[originKey];
}

const chains = Object.keys(displacements).map(confusionChain);

console.log(chains.join(' '))