// ==UserScript==
// @name         ПУК-СРЕНЬК
// @namespace    puksrenk
// @version      2.0
// @description  Encode and decode 2ch.hk fart code
// @author       Anonymous
// @match        https://2ch.hk/*/res/*.html
// @icon         data:image/png;base64,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
// @grant        none
// ==/UserScript==

const syms = [
  "ПУК",
  "СРЕНЬК",
  "ХРЮК",
  "УИИИ",
  "ЛАХТА",
  "ЛИБЕРАХА",
  "ХОХЛЫ",
  "СВИНОСОБАКА",
  "ШВАЙНОКАРАСЬ",
  "ЛОЛ",
  "КЕК",
  "АБУ",
  "ДВАЧ",
  "ПАРАША",
  "ПОРИДЖ",
  "ХРЮЧЕВО",
  "СВИН",
  "ПЕРДИКС",
  "ПЫНЯ",
  "ЧАЮ",
  "ШУЕ",
  "ЛЕВАК",
  "ПРАВАК",
  "КОМИГЛИСТ",
  "ШВЯТЫЕ",
  "ВАТА",
  "ВОЛОДИН",
  "ДОЛБИЛЬНЯ",
  "ПЕРЕФОРС",
  "КУНЧИК",
  "АВАТАРКА",
  "АНАЛЬЧИК",
];

const keysLen = Math.log2(syms.length);

const symsEncode = () => {
  let result = {};

  syms.forEach((item, index) => {
    result[("0".repeat(keysLen) + index.toString(2)).slice(-keysLen)] = item;
  });

  return result;
};

const symsDecode = () => {
  let result = {};

  Object.entries(symsEncode()).forEach(([key, value]) => {
    result[value] = key;
  });

  return result;
};

const rle = (string) => {
  let arr = string.split("-"),
    encoding = [],
    previous = arr[0],
    count = 1;

  for (let i = 1; i < arr.length; i++) {
    if (arr[i] !== previous) {
      encoding.push(count, previous);
      count = 1;
      previous = arr[i];
    } else {
      count++;
    }
  }

  encoding.push(count, previous);
  return encoding.join("-").replace(/1-/g, "").replace(/(\d)-/g, "$1");
};

const decode = (string) => {
  const data = symsDecode();

  let ba = string
    .split("-")
    .map((item) => {
      const count = /(\d*)(\w+)-?/.exec(item);

      if (count) {
        const key = item.replace(count[0], "");
        return data[key].repeat(parseInt(count[0]));
      }

      return data[item];
    })
    .join("");

  const padLen = ba.length % 8;
  ba = ba.substring(0, ba.length - padLen);

  return new TextDecoder().decode(
    new Uint8Array(ba.match(/.{1,8}/g).map((c) => parseInt(c, 2)))
  );
};

const encode = (string) => {
  let ba = new TextEncoder()
    .encode(string)
    .reduce((s, b) => s + b.toString(2).padStart(8, "0"), "");

  const padLen = keysLen - (ba.length % keysLen);
  ba = ba + "0".repeat(padLen);

  const data = symsEncode();

  return rle(
    ba
      .match(new RegExp(`.{1,${keysLen}}`, "g"))
      .map((item) => {
        return data[item];
      })
      .join("-")
  );
};

(() => {
  const posts = document.querySelectorAll(".post__message");

  posts.forEach((post) => {
    const words = post.textContent.replace(/\t+/g, "").split(/[\n, ]+/);

    const dict = syms.join("|");
    const re = new RegExp(`(\d+)?(${dict})\-.+(${dict})`);

    words.forEach((word) => {
      post.innerHTML = post.innerHTML.replace(re, (m) => {
        try {
          return `<div style="color:green;font-size:1.21em">${decode(m)
            .replace(/<.*?>/g, "[Я у мамы идиот]")
            .replace(/\n/g, "<br>")}</div>`;
        } catch (err) {
          return m;
        }
      });
    });
  });

  let div = document.createElement("div");
  div.className = "options__box";

  let encrypted = false;

  let btn = document.createElement("button");
  btn.className = "desktop button";
  btn.style = "color:green;font-weight:bold";
  btn.textContent = `Зашифровать`;
  btn.addEventListener("click", (e) => {
    e.preventDefault();

    const comment = document.querySelector('[name="comment"]');

    if (!encrypted) {
      btn.textContent = `Расшифровать`;
      encrypted = true;
      comment.value = encode(comment.value);
      document.querySelector(".postform__len").textContent =
        15000 - comment.value.length;
    } else {
      btn.textContent = `Зашифровать`;
      encrypted = false;
      comment.value = decode(comment.value);
      btn.textContent =
        "Зашифровать" +
        (comment.value.length > 0
          ? " (" + (15000 - encode(comment.value).length) + ")"
          : "");
      document.querySelector(".postform__len").textContent =
        15000 - comment.value.length;
    }
  });
  div.append(btn);

  const options = document.querySelector(".options");
  options.append(div);

  document
    .querySelector(".postform__len")
    .addEventListener("DOMSubtreeModified", () => {
      if (!encrypted) {
        const comment = document.querySelector('[name="comment"]');
        btn.textContent =
          "Зашифровать" +
          (comment.value.length > 0
            ? " (" + (15000 - encode(comment.value).length) + ")"
            : "");
      } else {
        btn.textContent = `Расшифровать`;
      }
    });
})();