// ==UserScript==
// @name         JRM: JoyReactor Mod
// @description  Модификация JoyReactor
// @version      2.4.2
// @author       DmitriyMX
// @namespace    https://gitlab.com/DmitriyMX/joyreactor-mod
// @downloadURL  https://gitlab.com/DmitriyMX/joyreactor-mod/raw/master/jrm.user.js
// @updateURL    https://gitlab.com/DmitriyMX/joyreactor-mod/raw/master/jrm.user.js
// @match        http://joy.reactor.cc/*
// @grant        none
// @run-at       document-end
// ==/UserScript==

class Post {
    /**
     * @param {HTMLElement} elmPost
     */
    constructor(elmPost) {
        const pc_len = 'postContainer'.length;

        /** @public {Number} */
        this.id = parseInt(elmPost.id.substring(pc_len));

        /** @public {String} */
        this.author = elmPost.getElementsByClassName('uhead_nick')[0].getElementsByTagName('a')[0].text;

        /** @public {String[]} */
        this.tags = [];
        for (const elmChild of elmPost.getElementsByClassName('taglist')[0].children) {
            this.tags.push(elmChild.textContent.trim());
        }
    }
}

class Comment {
    /**
     * @param {HTMLElement} elmComment
     */
    constructor(elmComment) {
        const cm_len = 'comment'.length;

        /** @public {HTMLElement} */
        this.element = elmComment;

        /** @public {Number} */
        this.id = parseInt(elmComment.id.substring(cm_len));

        const elmsTxt = elmComment.getElementsByClassName('txt');

        /** @public {String} */
        this.author = null;
        /** @public {String} */
        this.text = null;
        if (elmsTxt.length > 0) {
            let elms = elmsTxt[0].getElementsByClassName('comment_username');
            if (elms.length > 0) {
                this.author = elmsTxt[0].getElementsByClassName('comment_username')[0].textContent;
                this.text = elmsTxt[0].children[0].textContent;
            } else if (elmComment.getElementsByClassName('comment_show').length > 0) {
                this.author = elmComment.getElementsByClassName('comments_bottom')[0].children[1].children[0].textContent;
                this.text = '[HIDDEN COMMENT]';
            }
        }

        if (this.author === null) {
            throw new Error('author is NULL');
        }

        /** @public {String} */
        this.image = null;
        if (elmComment.getElementsByClassName('image').length > 0) {
            this.image = elmComment.getElementsByClassName('image')[0].children[0].href;
        }

        /** @public {Comment[]} */
        this.children = [];
        for (const childComment of document.getElementById('comment_list_comment_' + this.id).children) {
            if (childComment.id.startsWith('comment_list_comment_')) {
                continue;
            }

            try {
                this.children.push(new Comment(childComment));
            } catch (e) {
                console.error("--- ERROR ---");
                console.error(childComment);
                console.error(e);
                console.error("--- END ---");
            }
        }
    }
}

class JRApi {
    constructor() {
        /** @private {RegExp} */
        this._urlPostRegexp = new RegExp("https?:\/\/.+/post/([0-9]+)");
        /** @private {Comment[]} */
        this._comments = null;
    }

    /**
     * @return {Boolean}
     */
    isPostPage() {
        return (document.URL.match(this._urlPostRegexp) !== null);
    }

    /**
     * @return {Post}
     */
    post() {
        const postId = document.URL.match(this._urlPostRegexp)[1];
        const elmPostContainer = document.getElementById('postContainer' + postId);

        return new Post(elmPostContainer);
    }

    /**
     * @return {Post[]}
     */
    posts() {
        const elmPostList = document.getElementById('post_list');
        const postList = [];
        for (const elmPostContainer of elmPostList.children) {
            postList.push(new Post(elmPostContainer));
        }

        return postList;
    }

    /**
     * @return {Comment[]}
     */
    comments() {
        if (this._comments == null) {
            const postId = document.URL.match(this._urlPostRegexp)[1];

            this._comments = [];
            for (const elmComment of document.getElementById('comment_list_post_' + postId).children) {
                if (elmComment.id.startsWith('comment_list_comment_')) {
                    continue;
                }

                this._comments.push(new Comment(elmComment));
            }
        }

        return this._comments;
    }
}

class JRMod {
    /**
     * @param {JRApi} jrApi
     */
    constructor(jrApi) {
        this.jrApi = jrApi;
    }

    /**
     * Добавляем кнопку сворачивания ветки комментариев
     */
    addCollapseTreeCommentsButton() {
        /**
         * @param {Comment} comment
         * @return {HTMLElement}
         */
        const createButton = function (comment) {
            const aTag = document.createElement('a');
            aTag.href = "#";
            aTag.innerHTML = '➖';

            aTag.style.fontWeight = 'bold';
            aTag.style.color = '#656464';
            aTag.style.lineHeight = '31px';
            aTag.style.textDecoration = 'none';
            aTag.style.margin = '0 10px';
            aTag.style.padding = '0 10px'
            aTag.style.borderRadius = '15px';
            aTag.style.background = '#dfdfdf';

            const elmSubCommentList = document.getElementById('comment_list_comment_' + comment.id);
            aTag.onclick = function () {
                if (elmSubCommentList.style.display === 'none') {
                    elmSubCommentList.style.display = '';
                    aTag.innerHTML = '➖'; // ➖, -
                } else {
                    elmSubCommentList.style.display = 'none';
                    aTag.innerHTML = '➕'; // ➕, +
                }
                return false;
            }

            return aTag;
        }

        /** @param {Comment} comment */
        const func = function (comment) {
            if (comment.children.length === 0) return;
            comment.element.getElementsByClassName('reply-link')[0].appendChild(createButton(comment));
            comment.children.forEach(comment => func(comment));
        }

        this.jrApi.comments().forEach(comment => func(comment));
    }

    /**
     * Удалить пункты меню "Люди" и "О проекте"
     */
    removeTopMenuItems() {
        //@formatter:off
        Array.from(document.querySelectorAll('#navlist li'))
            .filter(elm => { return elm.querySelector('a').text === "Люди"
                || elm.querySelector('a').text === "О проекте" })
            .forEach(elm => { elm.remove() });
        //@formatter:on
    }

    /**
     * Удалить правую колонку
     */
    removeRightColumn() {
        document.getElementById('sidebar').remove();

        const width = '930px';
        document.getElementById('header').style.width = width;
        document.getElementById('page').style.width = width;
        document.getElementById('topbar').children[0].style.width = width;
        document.getElementById('container').style.minWidth = '0';
    }

    /**
     * Удалить переключатель языков
     */
    removeLangSwitch() {
        Array.from(document.getElementsByClassName('lang_select')).forEach(elm => { elm.remove() });
    }

    /**
     * Удалить из поста блоки "Тренды" и "Фэндомы"
     */
    removeTrandsAndFandomsBlock() {
        const elements = document.getElementsByClassName('additional_info');
        if (elements.length > 0) {
            elements[0].remove();
        }
    }

    /**
     * Удалить из поста блок "Похожие посты"
     */
    removeSimilarPostsBlock() {
        const elements = Array.from(document.getElementsByClassName('mainheader'))
            .filter(elm => { return elm.innerText === "Похожие посты" });
        if (elements.length === 1) {
            elements[0].nextElementSibling.remove();
            elements[0].remove();
        }
    }
}

(function() {
    'use strict';
    const api = new JRApi();
    const mod = new JRMod(api);

    mod.removeLangSwitch();
    mod.removeTopMenuItems();
    mod.removeRightColumn();

    if (api.isPostPage()) {
        mod.addCollapseTreeCommentsButton();
        mod.removeTrandsAndFandomsBlock()
        mod.removeSimilarPostsBlock()
    } else {
        console.log(api.posts());
    }
})();