// ==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
// @run-at       document-end
// ==/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 parse = (node) => {
        const post = node.querySelector(".post__message");

        const words = post.textContent.replace(/\t+/g, "").split(/[\n, ]+/);
        const re = new RegExp(
            `(\\d+)?(${syms.join("|")})\-(\\S+)\-(\\d+)?(${syms.join("|")})`
        );

        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;
                }
            });
        });
    };

    const posts = document.querySelectorAll(".thread__post");
    parse(document.querySelector(".thread__oppost"));
    posts.forEach((post) => parse(post));

    const observer = new MutationObserver((o) => {
        o.forEach((i) => {
            if (i.addedNodes) {
                i.addedNodes.forEach((node) => parse(node));
            }
        });
    })

    const config = { childList: true };
    observer.observe(document.querySelector(".thread"), config)
    observer.observe(document.querySelector("#posts-form"), config);

    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`;
            }
        });
})();