VBookProcess - Weread Progress Show

在网页版微信读书右下角显示当前阅读进度
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// ==UserScript==
// @name         VBookProcess - Weread Progress Show
// @namespace    https://github.com/chan1919/VBookProcess
// @version      1.0.0
// @description  在网页版微信读书右下角显示当前阅读进度
// @match        https://weread.qq.com/*
// @grant        GM_addStyle
// @license      MIT
// @run-at       document-idle
// @supportURL   https://github.com/chan1919/VBookProcess/issues
// @homepageURL  https://github.com/chan1919/VBookProcess
// ==/UserScript==

(function () {
    'use strict';

    let currentChapterRatio = 0;
    let nextChapterRatio = 0;
    let result = 0;
    let chapterObserver = null;
    let initAttempts = 0;
    const MAX_ATTEMPTS = 30;

    GM_addStyle(`
        #weread-progress-box {
            position: fixed !important;
            bottom: 60px !important;
            right: 5px !important;
            width: 50px !important;
            height: 30px !important;
            font-size: 12px !important;
            padding: 0 !important;
            align-items: center !important;
            text-align: center !important;
            display: flex !important;
            justify-content: center !important;
            background-color: #6b6b6b !important;
            color: #fff !important;
            border-radius: 5px !important;
            z-index: 2147483647 !important;
            pointer-events: none !important;
        }
    `);

    function getChapterItems() {
        const items = document.querySelectorAll('.readerCatalog_list_item');
        return items;
    }

    function isOnReaderPage() {
        return window.location.href.includes('/web/reader/') ||
               document.querySelector('.readerContent') !== null ||
               document.querySelector('.readerCatalog_list') !== null;
    }

    function updateChapterRatio() {
        const chapterItems = getChapterItems();
        if (chapterItems.length === 0) {
            return false;
        }

        const chapterTotal = chapterItems.length;
        let found = false;

        for (let i = 0; i < chapterTotal; i++) {
            const className = chapterItems[i].className || '';
            if (className.includes('readerCatalog_list_item_selected')) {
                currentChapterRatio = parseFloat(((i / chapterTotal) * 100).toFixed(1));
                nextChapterRatio = parseFloat((((i + 1) / chapterTotal) * 100).toFixed(1));
                result = currentChapterRatio;
                updateProgressBox();
                found = true;
                break;
            }
        }

        return found;
    }

    function watchChapterChange() {
        const chapterItems = getChapterItems();

        if (chapterItems.length === 0) {
            return false;
        }

        updateChapterRatio();

        if (chapterObserver) {
            chapterObserver.disconnect();
        }

        chapterObserver = new MutationObserver(function (mutations) {
            mutations.forEach(function (mutation) {
                if (mutation.type === 'attributes') {
                    updateChapterRatio();
                }
            });
        });

        chapterItems.forEach(item => {
            chapterObserver.observe(item, { attributes: true });
        });

        return true;
    }

    function updateScrollRatio() {
        const scrollPosition = window.scrollY || window.pageYOffset;
        const docHeight = document.documentElement.scrollHeight;
        const winHeight = window.innerHeight;
        const maxScrollPosition = docHeight - winHeight;

        if (maxScrollPosition > 0) {
            const scrollRatio = scrollPosition / maxScrollPosition;
            const totalRatio = (nextChapterRatio - currentChapterRatio) * scrollRatio + currentChapterRatio;
            result = parseFloat(totalRatio.toFixed(1));
            updateProgressBox();
        }
    }

    function updateProgressBox() {
        let progressBox = document.querySelector('#weread-progress-box');

        if (!progressBox) {
            progressBox = document.createElement('div');
            progressBox.id = 'weread-progress-box';
            document.body.appendChild(progressBox);
        }

        progressBox.textContent = result + '%';
    }

    function tryInit() {
        if (!isOnReaderPage()) {
            return;
        }

        initAttempts++;

        if (initAttempts > MAX_ATTEMPTS) {
            return;
        }

        updateProgressBox();

        const success = watchChapterChange();

        if (!success) {
            setTimeout(tryInit, 500);
        }
    }

    function init() {
        updateProgressBox();
        tryInit();

        window.addEventListener('scroll', updateScrollRatio, { passive: true });

        let lastUrl = location.href;
        new MutationObserver(() => {
            const url = location.href;
            if (url !== lastUrl) {
                lastUrl = url;
                initAttempts = 0;
                setTimeout(tryInit, 1000);
            }
        }).observe(document, { subtree: true, childList: true });

        const bodyObserver = new MutationObserver(function (mutations) {
            const chapterItems = getChapterItems();
            if (chapterItems.length > 0 && !chapterObserver) {
                watchChapterChange();
            }
        });

        bodyObserver.observe(document.body, {
            childList: true,
            subtree: true
        });
    }

    if (document.readyState === 'complete' || document.readyState === 'interactive') {
        setTimeout(init, 500);
    } else {
        window.addEventListener('load', function() {
            setTimeout(init, 500);
        });
    }

})();