Fake Reader

在任意网页中阅读EPUB电子书，支持EPUB渲染模式和纯文本模式
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// ==UserScript==
// @name         Fake Reader
// @namespace    
// @version      1.1.0
// @description  在任意网页中阅读EPUB电子书，支持EPUB渲染模式和纯文本模式
// @author       kudou61
// @match        *://*/*
// @grant        none
// @require      https://cdn.jsdelivr.net/npm/[email protected]/dist/jszip.min.js
// @require      https://cdn.jsdelivr.net/npm/[email protected]/dist/epub.min.js
// ==/UserScript==

/**
 * Fake Reader - 在网页中阅读EPUB电子书的油猴脚本
 *
 * 功能特性：
 * - EPUB渲染模式：使用epub.js进行完整渲染
 * - 纯文本模式：提取文本内容，按章节或字符数分页
 * - 键盘翻页：← → 或 Cmd/Ctrl + [ ]
 * - 页码跳转：在设置面板输入页码
 * - 进度保存：自动保存阅读进度
 * - 快捷键：Cmd/Ctrl + B 打开设置面板
 */

(function() {
    'use strict';

    // ============================================================================
    // 常量配置
    // ============================================================================

    const CONSTANTS = {
        // DOM 元素 ID
        IDs: {
            OVERLAY: 'er-overlay',
            SETTINGS_PANEL: 'er-settings',
            READER: 'er-reader',
            TEXT_READER: 'er-text-reader',
            TEXT_DISPLAY: 'er-text-display',
            PAGE_CONTENT: 'er-page-content',
            STYLES: 'er-styles',
            READING_PROGRESS: 'er-reading-progress'
        },

        // 存储键
        STORAGE: {
            TARGET_DIV: 'epub_reader_target_div',
            BOOK_PROGRESS: 'epub_reader_progress'
        },

        // 默认配置
        CONFIG: {
            CHARS_PER_PAGE_MIN: 500,
            CHARS_PER_PAGE_MAX: 5000,
            EPUB_LOCATION_INTERVAL: 1600,
            NOTIFICATION_DURATION: 3000
        },

        // 命名空间（全局变量前缀）
        NS: 'epubReader'
    };

    // ============================================================================
    // 全局状态
    // ============================================================================

    const State = {
        // EPUB 相关
        book: null,
        rendition: null,
        currentBookFile: null,

        // 阅读器状态
        isReaderActive: false,
        settingsPanel: null,

        // 键盘事件清理函数
        keydownCleanup: null
    };

    // 暴露给全局的接口（供设置面板调用）
    window[CONSTANTS.NS + 'Interface'] = null;
    window[CONSTANTS.NS + 'State'] = null;

    // ============================================================================
    // 工具模块 (Utils)
    // ============================================================================

    const Utils = {
        /**
         * 读取文件为 ArrayBuffer
         * @param {File} file - 文件对象
         * @returns {Promise<ArrayBuffer>}
         */
        readFileAsArrayBuffer(file) {
            return new Promise((resolve, reject) => {
                const reader = new FileReader();
                reader.onload = (e) => resolve(e.target.result);
                reader.onerror = () => reject(new Error('文件读取失败'));
                reader.readAsArrayBuffer(file);
            });
        },

        /**
         * 显示通知消息
         * @param {string} message - 消息内容
         * @param {string} type - 类型: 'info' | 'error' | 'success'
         */
        showNotification(message, type = 'info') {
            const notification = document.createElement('div');
            notification.className = `${CONSTANTS.IDs.STYLES}-notification`;

            const colors = {
                info: { borderLeft: '#3b82f6', bg: '#eff6ff' },
                error: { borderLeft: '#ef4444', bg: '#fef2f2' },
                success: { borderLeft: '#22c55e', bg: '#f0fdf4' }
            };
            const color = colors[type] || colors.info;

            notification.style.cssText = `
                position: fixed;
                top: 24px;
                right: 24px;
                background: ${color.bg};
                color: #333;
                padding: 14px 20px;
                border-radius: 12px;
                z-index: 10001;
                font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
                font-size: 14px;
                font-weight: 500;
                box-shadow: 0 8px 24px rgba(0,0,0,0.15);
                max-width: 320px;
                border-left: 4px solid ${color.borderLeft};
                opacity: 0;
                transform: translateX(20px);
                animation: er-notification-in 0.3s ease forwards;
                transition: opacity 0.3s ease, transform 0.3s ease;
            `;

            notification.textContent = message;
            document.body.appendChild(notification);

            setTimeout(() => {
                notification.style.opacity = '0';
                notification.style.transform = 'translateX(20px)';
                setTimeout(() => notification.remove(), 300);
            }, CONSTANTS.CONFIG.NOTIFICATION_DURATION);
        },

        /**
         * 存储适配器
         */
        Storage: {
            set(key, value) {
                window.localStorage.setItem(key, JSON.stringify(value));
            },
            get(key, defaultValue = null) {
                try {
                    const item = window.localStorage.getItem(key);
                    return item ? JSON.parse(item) : defaultValue;
                } catch {
                    return defaultValue;
                }
            },
            remove(key) {
                window.localStorage.removeItem(key);
            }
        },

        /**
         * 根据选择器获取 DOM 元素
         * @param {string} selector - CSS 选择器
         * @returns {Element|null}
         */
        getElementBySelector(selector) {
            if (!selector) return null;
            if (selector.startsWith('#')) {
                return document.getElementById(selector.slice(1));
            }
            if (selector.startsWith('.')) {
                return document.querySelector(selector);
            }
            return document.getElementById(selector) || document.querySelector(selector);
        },

        /**
         * 验证并限制字符数范围
         * @param {number|null} value - 输入值
         * @returns {number|null}
         */
        clampCharsPerPage(value) {
            if (value === null) return null;
            if (value < CONSTANTS.CONFIG.CHARS_PER_PAGE_MIN) {
                return CONSTANTS.CONFIG.CHARS_PER_PAGE_MIN;
            }
            if (value > CONSTANTS.CONFIG.CHARS_PER_PAGE_MAX) {
                return CONSTANTS.CONFIG.CHARS_PER_PAGE_MAX;
            }
            return value;
        }
    };

    // ============================================================================
    // 样式模块 (Styles)
    // ============================================================================

    const Styles = `
        @keyframes er-settings-in {
            to {
                opacity: 1;
                transform: translate(-50%, -50%) scale(1);
            }
        }
        @keyframes er-overlay-in {
            to { opacity: 1; }
        }
        @keyframes er-notification-in {
            to {
                opacity: 1;
                transform: translateX(0);
            }
        }

        #${CONSTANTS.IDs.SETTINGS_PANEL} {
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%) scale(0.95);
            background: white;
            padding: 16px;
            box-shadow: 0 4px 20px rgba(0,0,0,0.15);
            z-index: 10000;
            max-width: 380px;
            width: 90%;
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            border-radius: 10px;
            opacity: 0;
            animation: er-settings-in 0.2s ease forwards;
        }

        #${CONSTANTS.IDs.SETTINGS_PANEL} h2 {
            margin: 0 0 12px 0;
            color: #1a1a1a;
            font-size: 16px;
            font-weight: 600;
            letter-spacing: -0.3px;
            padding-bottom: 8px;
            border-bottom: 1px solid #eee;
        }

        #${CONSTANTS.IDs.SETTINGS_PANEL} .er-form-group {
            margin-bottom: 10px;
        }

        #${CONSTANTS.IDs.SETTINGS_PANEL} label {
            display: block;
            margin-bottom: 4px;
            font-weight: 500;
            color: #555;
            font-size: 12px;
        }

        #${CONSTANTS.IDs.SETTINGS_PANEL} input[type="text"],
        #${CONSTANTS.IDs.SETTINGS_PANEL} input[type="number"] {
            width: 100%;
            padding: 7px 9px;
            border: 1px solid #ddd;
            border-radius: 5px;
            box-sizing: border-box;
            font-size: 13px;
            font-family: inherit;
            background: #fafafa;
            transition: all 0.15s ease;
        }

        #${CONSTANTS.IDs.SETTINGS_PANEL} input[type="text"]:focus,
        #${CONSTANTS.IDs.SETTINGS_PANEL} input[type="number"]:focus {
            outline: none;
            border-color: #3b82f6;
            background: white;
        }

        #${CONSTANTS.IDs.SETTINGS_PANEL} input[type="file"] {
            width: 100%;
            padding: 5px;
            border: 1px dashed #ddd;
            border-radius: 5px;
            box-sizing: border-box;
            background: #fafafa;
            cursor: pointer;
            font-size: 12px;
        }

        #${CONSTANTS.IDs.SETTINGS_PANEL} #er-reading-progress {
            padding: 7px 9px;
            background: #f0f9ff;
            border-radius: 5px;
            color: #0369a1;
            font-size: 12px;
            text-align: center;
        }

        #${CONSTANTS.IDs.SETTINGS_PANEL} small {
            display: block;
            margin-top: 2px;
            color: #999;
            font-size: 11px;
        }

        #${CONSTANTS.IDs.SETTINGS_PANEL} .er-button-group {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
            padding-top: 2px;
        }

        #${CONSTANTS.IDs.SETTINGS_PANEL} button {
            background: #3b82f6;
            color: white;
            border: none;
            padding: 6px 11px;
            border-radius: 5px;
            cursor: pointer;
            font-size: 12px;
            font-weight: 500;
            font-family: inherit;
            transition: all 0.15s ease;
            flex: 0 0 auto;
        }

        #${CONSTANTS.IDs.SETTINGS_PANEL} button:hover {
            background: #2563eb;
        }

        #${CONSTANTS.IDs.SETTINGS_PANEL} .er-close-btn {
            background: #ef4444;
        }

        #${CONSTANTS.IDs.SETTINGS_PANEL} .er-close-btn:hover {
            background: #dc2626;
        }

        #${CONSTANTS.IDs.SETTINGS_PANEL} .er-shortcut-hint {
            margin-top: 10px;
            padding: 6px;
            background: #f8f9fa;
            border-radius: 5px;
            font-size: 10px;
            color: #999;
            text-align: center;
        }

        #${CONSTANTS.IDs.OVERLAY} {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.3);
            z-index: 9999;
            opacity: 0;
            animation: er-overlay-in 0.2s ease forwards;
        }

        .${CONSTANTS.IDs.READER} {
            width: 100%;
            height: 600px;
            border: 1px solid #ddd;
            border-radius: 4px;
            overflow: hidden;
            background: white;
            min-height: 600px;
        }

        .${CONSTANTS.IDs.READER} iframe {
            width: 100%;
            height: 100%;
            border: none;
        }

        .${CONSTANTS.IDs.TEXT_READER} {
            width: 100%;
            height: 100%;
            display: flex;
            flex-direction: column;
        }

        #${CONSTANTS.IDs.TEXT_DISPLAY} {
            flex: 1;
            max-width: 800px;
            margin: 0 auto;
            padding: 20px;
            line-height: 1.8;
            font-family: Arial, sans-serif;
            font-size: 16px;
            white-space: pre-line;
            overflow-y: auto;
            height: calc(100vh - 120px);
        }
    `;

    /**
     * 注入样式到页面
     */
    function injectStyles() {
        if (!document.getElementById(CONSTANTS.IDs.STYLES)) {
            const style = document.createElement('style');
            style.id = CONSTANTS.IDs.STYLES;
            style.textContent = Styles;
            document.head.appendChild(style);
        }
    }

    // ============================================================================
    // 分页模块 (Pagination)
    // ============================================================================

    const Pagination = {
        /**
         * 按章节分页（每章一页）
         * @param {string} text - 完整文本
         * @returns {string[]} 页面数组
         */
        byChapter(text) {
            const pages = [];
            const sections = text.split(/\n\n## /);

            sections.forEach((section, index) => {
                let trimmed = section.trim();
                if (index > 0 && !trimmed.startsWith('## ')) {
                    trimmed = '## ' + trimmed;
                }
                if (trimmed) {
                    pages.push(trimmed);
                }
            });

            console.log(`[${CONSTANTS.NS}] 按章节分页完成: ${pages.length} 页`);
            return pages;
        },

        /**
         * 按字符数分页
         * @param {string} text - 完整文本
         * @param {number} charsPerPage - 每页字符数
         * @returns {string[]} 页面数组
         */
        byChars(text, charsPerPage) {
            const pages = [];
            let currentPage = '';
            let currentLength = 0;
            const sections = text.split(/\n\n## /);

            sections.forEach((section, index) => {
                let s = section;
                if (index > 0 && !s.startsWith('## ')) {
                    s = '## ' + s;
                }

                // 超长章节需进一步分割
                if (s.length > charsPerPage) {
                    if (currentPage.trim()) {
                        pages.push(currentPage.trim());
                        currentPage = '';
                        currentLength = 0;
                    }

                    const paragraphs = s.split(/\n{2,}/);
                    paragraphs.forEach(para => {
                        const trimmedPara = para.trim();
                        if (!trimmedPara) return;

                        const separator = currentPage.length > 0 ? '\n\n' : '';
                        if (currentLength + trimmedPara.length + separator.length > charsPerPage) {
                            if (currentPage.trim()) {
                                pages.push(currentPage.trim());
                            }
                            currentPage = trimmedPara;
                            currentLength = trimmedPara.length;
                        } else {
                            currentPage += separator + trimmedPara;
                            currentLength += trimmedPara.length + separator.length;
                        }
                    });
                } else {
                    const separator = currentPage.length > 0 ? '\n\n' : '';
                    if (currentLength + s.length + separator.length > charsPerPage) {
                        if (currentPage.trim()) {
                            pages.push(currentPage.trim());
                        }
                        currentPage = s;
                        currentLength = s.length;
                    } else {
                        currentPage += separator + s;
                        currentLength += s.length + separator.length;
                    }
                }
            });

            if (currentPage.trim()) {
                pages.push(currentPage.trim());
            }

            if (pages.length === 0 && text.trim()) {
                pages.push(text.trim());
            }

            console.log(`[${CONSTANTS.NS}] 按字符数分页完成: ${pages.length} 页, 每页 ${charsPerPage} 字`);
            return pages;
        }
    };

    // ============================================================================
    // UI 模块 (Settings Panel)
    // ============================================================================

    const Panel = {
        /**
         * 创建设置面板
         */
        create: function() {
            if (State.settingsPanel) {
                State.settingsPanel.remove();
            }

            const overlay = document.createElement('div');
            overlay.id = CONSTANTS.IDs.OVERLAY;

            const panel = document.createElement('div');
            panel.id = CONSTANTS.IDs.SETTINGS_PANEL;
            panel.innerHTML = `
                <h2>EPUB 阅读器设置</h2>

                <div class="er-form-group">
                    <label for="er-file">选择EPUB文件:</label>
                    <input type="file" id="er-file" accept=".epub">
                </div>

                <div class="er-form-group">
                    <label for="er-div-selector">目标DIV选择器:</label>
                    <input type="text" id="er-div-selector" placeholder="如: #content 或 .main-content">
                </div>

                <div class="er-form-group">
                    <label for="er-page-number">跳转到页码:</label>
                    <input type="number" id="er-page-number" min="1" placeholder="输入页码">
                </div>

                <div class="er-form-group" id="er-chars-group" style="display: none;">
                    <label for="er-chars-per-page">每页字符数 (留空按章节):</label>
                    <input type="number" id="er-chars-per-page" min="${CONSTANTS.CONFIG.CHARS_PER_PAGE_MIN}" max="${CONSTANTS.CONFIG.CHARS_PER_PAGE_MAX}" placeholder="留空按章节">
                    <small>范围: ${CONSTANTS.CONFIG.CHARS_PER_PAGE_MIN} - ${CONSTANTS.CONFIG.CHARS_PER_PAGE_MAX} 字</small>
                </div>

                <div class="er-form-group">
                    <label>阅读进度:</label>
                    <div id="${CONSTANTS.IDs.READING_PROGRESS}">未开始阅读</div>
                </div>

                <div class="er-button-group">
                    <button id="er-apply">应用</button>
                    <button id="er-start-epub">EPUB模式</button>
                    <button id="er-start-text">文本模式</button>
                    <button class="er-close-btn" id="er-close">关闭</button>
                </div>

                <div class="er-shortcut-hint">
                    翻页: ← → 或 Cmd/Ctrl + [ ] · 设置: Cmd/Ctrl + B
                </div>
            `;

            document.body.appendChild(overlay);
            document.body.appendChild(panel);
            State.settingsPanel = panel;

            Panel._bindEvents();
            Panel._loadSettings();
        },

        /**
         * 绑定面板事件
         */
        _bindEvents: function() {
            const overlay = document.getElementById(CONSTANTS.IDs.OVERLAY);
            overlay.addEventListener('click', Panel.close);

            document.getElementById('er-close').addEventListener('click', Panel.close);
            document.getElementById('er-apply').addEventListener('click', Panel.applySettings);
            document.getElementById('er-start-epub').addEventListener('click', EpubReader.start);
            document.getElementById('er-start-text').addEventListener('click', TextReader.start);
            document.getElementById('er-file').addEventListener('change', Panel.handleFileSelect);
        },

        /**
         * 加载已保存的设置
         */
        _loadSettings: function() {
            const savedDiv = Utils.Storage.get(CONSTANTS.STORAGE.TARGET_DIV);
            if (savedDiv) {
                document.getElementById('er-div-selector').value = savedDiv;
            }

            const progress = Utils.Storage.get(CONSTANTS.STORAGE.BOOK_PROGRESS);
            const state = window[CONSTANTS.NS + 'State'];

            // 文本模式: 通过 keydownCleanup 判断（最可靠）
            const isTextMode = !!State.keydownCleanup;
            const charsGroup = document.getElementById('er-chars-group');
            const progressEl = document.getElementById(CONSTANTS.IDs.READING_PROGRESS);

            // 文本模式: 显示字符数设置组，从全局状态读取进度
            if (isTextMode && charsGroup) {
                charsGroup.style.display = 'block';

                if (state && state.totalPages > 0) {
                    const percentage = state.totalPages > 1
                        ? Math.round((state.currentPage / (state.totalPages - 1)) * 100)
                        : 100;
                    progressEl.textContent = `第 ${state.currentPage + 1} / ${state.totalPages} (${percentage}%)`;

                    const charsInput = document.getElementById('er-chars-per-page');
                    if (charsInput) {
                        charsInput.value = state.charsPerPage !== undefined && state.charsPerPage !== null ? state.charsPerPage : '';
                    }
                }
            } else if (charsGroup) {
                // EPUB 模式或其他: 隐藏字符数设置组
                charsGroup.style.display = 'none';

                // 从存储读取进度
                if (progress && progressEl) {
                    progressEl.textContent = `第 ${progress.currentPage} / ${progress.totalPages || '未知'}`;
                }
            }
        },

        /**
         * 关闭设置面板
         */
        close: function() {
            const overlay = document.getElementById(CONSTANTS.IDs.OVERLAY);
            const panel = document.getElementById(CONSTANTS.IDs.SETTINGS_PANEL);
            if (overlay) overlay.remove();
            if (panel) panel.remove();
            State.settingsPanel = null;
        },

        /**
         * 处理文件选择
         */
        handleFileSelect: async function(event) {
            const file = event.target.files[0];
            if (!file) return;

            if (!file.name.toLowerCase().endsWith('.epub')) {
                Utils.showNotification('请选择EPUB格式的文件', 'error');
                return;
            }

            try {
                const arrayBuffer = await Utils.readFileAsArrayBuffer(file);
                if (arrayBuffer.byteLength === 0) {
                    throw new Error('文件为空或损坏');
                }
                State.currentBookFile = arrayBuffer;
                Utils.showNotification('电子书已加载');
            } catch (error) {
                Utils.showNotification('加载失败: ' + error.message, 'error');
            }
        },

        /**
         * 应用设置（处理跳转和分页）
         */
        applySettings: function() {
            const divSelector = document.getElementById('er-div-selector').value.trim();
            if (!divSelector) {
                Utils.showNotification('请输入目标DIV选择器', 'error');
                return;
            }

            Utils.Storage.set(CONSTANTS.STORAGE.TARGET_DIV, divSelector);

            // 处理每页字符数（文本模式）
            const charsInput = document.getElementById('er-chars-per-page');
            if (charsInput) {
                const inputValue = charsInput.value.trim();
                let newCharsPerPage = inputValue ? parseInt(inputValue) : null;
                newCharsPerPage = Utils.clampCharsPerPage(newCharsPerPage);
                charsInput.value = newCharsPerPage || '';

                const readerInterface = window[CONSTANTS.NS + 'Interface'];
                if (readerInterface && readerInterface.repaginate) {
                    readerInterface.repaginate(newCharsPerPage);
                }
            }

            // 处理页码跳转
            const pageNumber = parseInt(document.getElementById('er-page-number').value);
            if (pageNumber && pageNumber > 0) {
                Panel._jumpToPage(pageNumber);
            } else {
                Utils.showNotification('设置已保存');
            }
        },

        /**
         * 跳转到指定页码
         */
        _jumpToPage: function(pageNumber) {
            // EPUB 模式
            if (State.rendition && State.book) {
                State.book.locations.generate(CONSTANTS.CONFIG.EPUB_LOCATION_INTERVAL)
                    .then(() => {
                        const location = State.book.locations.cfiFromLocation(pageNumber);
                        if (location) {
                            return State.rendition.goto(location);
                        }
                        throw new Error('页码超出范围');
                    })
                    .then(() => Utils.showNotification(`已跳转到第 ${pageNumber} 页`))
                    .catch(() => {
                        Utils.showNotification('跳转失败', 'error');
                    });
                return;
            }

            // 文本模式
            const readerInterface = window[CONSTANTS.NS + 'Interface'];
            if (readerInterface && readerInterface.displayPage) {
                const state = window[CONSTANTS.NS + 'State'];
                const totalPages = state ? state.totalPages : 0;
                if (pageNumber <= totalPages) {
                    readerInterface.displayPage(pageNumber - 1);
                    Utils.showNotification(`已跳转到第 ${pageNumber} 页`);
                } else {
                    Utils.showNotification(`页码超出范围，共 ${totalPages} 页`, 'error');
                }
                return;
            }

            Utils.showNotification('请先启动阅读器', 'error');
        }
    };

    // ============================================================================
    // EPUB 阅读器模块
    // ============================================================================

    const EpubReader = {
        /**
         * 启动 EPUB 阅读器
         */
        start: async function() {
            // 先停止当前阅读器
            stopReader();

            const divSelector = document.getElementById('er-div-selector').value.trim() ||
                Utils.Storage.get(CONSTANTS.STORAGE.TARGET_DIV);
            const pageNumber = parseInt(document.getElementById('er-page-number').value) || 1;

            if (!divSelector) {
                Utils.showNotification('请先设置目标DIV选择器', 'error');
                return;
            }

            const file = await EpubReader._getBookFile();
            if (!file) {
                Utils.showNotification('请先选择EPUB文件', 'error');
                return;
            }

            State.currentBookFile = file;

            try {
                await EpubReader._initialize(divSelector, pageNumber);
                Panel.close();
            } catch (error) {
                Utils.showNotification('启动失败: ' + error.message, 'error');
            }
        },

        /**
         * 获取 EPUB 文件
         */
        _getBookFile: function() {
            if (State.currentBookFile) return State.currentBookFile;
            const fileInput = document.getElementById('er-file');
            if (fileInput && fileInput.files && fileInput.files[0]) {
                return Utils.readFileAsArrayBuffer(fileInput.files[0]);
            }
            return null;
        },

        /**
         * 初始化 EPUB 阅读器
         */
        _initialize: async function(divSelector, startPage = 1) {
            const targetDiv = Utils.getElementBySelector(divSelector);
            if (!targetDiv) {
                throw new Error('找不到指定的DIV元素: ' + divSelector);
            }

            if (!State.currentBookFile) {
                throw new Error('请先选择EPUB文件');
            }

            // 清空目标DIV并创建容器
            targetDiv.innerHTML = '';
            const readerContainer = document.createElement('div');
            readerContainer.id = CONSTANTS.IDs.READER;
            readerContainer.className = CONSTANTS.IDs.READER;
            targetDiv.appendChild(readerContainer);

            readerContainer.innerHTML = '<div style="padding: 20px; text-align: center; color: #666;">正在加载...</div>';

            // 暴露 JSZip 到全局
            if (typeof unsafeWindow !== 'undefined') {
                unsafeWindow.JSZip = JSZip;
                unsafeWindow.ePub = ePub;
            } else {
                window.JSZip = JSZip;
                window.ePub = ePub;
            }

            try {
                State.book = ePub(State.currentBookFile);
                State.rendition = State.book.renderTo(CONSTANTS.IDs.READER, {
                    width: '100%',
                    height: '600px',
                    spread: 'always',
                    allowScriptedContent: true
                });

                // 加载书籍
                State.book.ready
                    .then(() => State.book.loaded.metadata)
                    .then(() => {
                        readerContainer.innerHTML = '';
                        return State.rendition.display();
                    })
                    .then(() => EpubReader._jumpToPage(startPage));

                // 设置事件监听
                State.rendition.on('relocated', (location) => {
                    const percentage = location.start.percentage || 0;
                    const currentLocation = location.start.location || 0;
                    const currentPage = Math.max(1, location.start.location || 0);
                    const totalPages = State.book.locations && State.book.locations.length();
                    Utils.Storage.set(CONSTANTS.STORAGE.BOOK_PROGRESS, {
                        currentPage,
                        totalPages: totalPages || '未知',
                        percentage
                    });
                    console.log(`[${CONSTANTS.NS}] EPUB 翻页: 第${currentPage}页, ${totalPages || '未知'}总页`);
                });

                State.rendition.on('error', (error) => {
                    readerContainer.innerHTML = `<div style="padding: 20px; text-align: center; color: red;">渲染错误: ${error.message}</div>`;
                });

                State.rendition.on('rendered', (section) => {
                    console.log(`[${CONSTANTS.NS}] 章节渲染完成`);
                });

                // 生成位置信息
                if (startPage <= 1) {
                    State.book.locations.generate(CONSTANTS.CONFIG.EPUB_LOCATION_INTERVAL).catch(() => {});
                }

            } catch (error) {
                readerContainer.innerHTML = `<div style="padding: 20px; text-align: center; color: red;">初始化失败: ${error.message}</div>`;
                throw error;
            }

            State.isReaderActive = true;
            Utils.Storage.set(CONSTANTS.STORAGE.TARGET_DIV, divSelector);
        },

        /**
         * 跳转到指定页码
         */
        _jumpToPage(pageNumber) {
            if (pageNumber <= 1) return;
            State.book.locations.generate(CONSTANTS.CONFIG.EPUB_LOCATION_INTERVAL)
                .then(() => {
                    const location = State.book.locations.cfiFromLocation(pageNumber);
                    if (location) {
                        return State.rendition.goto(location);
                    }
                })
                .catch(() => {});
        }
    };

    // ============================================================================
    // 纯文本阅读器模块
    // ============================================================================

    const TextReader = {
        /**
         * 启动纯文本模式
         */
        start: async function() {
            // 先停止当前阅读器
            stopReader();

            const divSelector = document.getElementById('er-div-selector').value.trim() ||
                Utils.Storage.get(CONSTANTS.STORAGE.TARGET_DIV);

            if (!divSelector) {
                Utils.showNotification('请先设置目标DIV选择器', 'error');
                return;
            }

            let file = null;
            if (State.currentBookFile) {
                file = State.currentBookFile;
            } else {
                const fileInput = document.getElementById('er-file');
                if (fileInput && fileInput.files && fileInput.files[0]) {
                    file = await Utils.readFileAsArrayBuffer(fileInput.files[0]);
                }
            }

            if (!file) {
                Utils.showNotification('请先选择EPUB文件', 'error');
                return;
            }

            State.currentBookFile = file;

            const targetDiv = Utils.getElementBySelector(divSelector);
            if (!targetDiv) {
                Utils.showNotification('找不到指定的DIV元素', 'error');
                return;
            }

            try {
                const initData = await TextReader._initialize(file, targetDiv);
                const readerInterface = TextReader._createInterface(targetDiv, initData.pages, initData.metadata, initData.allText, null);

                console.log(`[${CONSTANTS.NS}] 纯文本模式启动: ${initData.chapters.length} 章, ${initData.pages.length} 页`);
                Panel.close();
                Utils.showNotification('纯文本模式已启动');
            } catch (error) {
                Utils.showNotification('启动失败: ' + error.message, 'error');
            }
        },

        /**
         * 初始化纯文本模式
         */
        _initialize: async function(arrayBuffer, targetDiv) {
            State.isReaderActive = true;

            targetDiv.innerHTML = '';
            const container = document.createElement('div');
            container.id = CONSTANTS.IDs.TEXT_READER;
            container.className = CONSTANTS.IDs.TEXT_READER;
            targetDiv.appendChild(container);
            container.innerHTML = '<div style="padding: 20px; text-align: center; color: #666;">正在加载...</div>';

            State.book = ePub(arrayBuffer);
            await State.book.ready;

            const metadata = await State.book.loaded.metadata;
            const navigation = await State.book.loaded.navigation;

            let allText = `${metadata.title || '未知标题'}\n作者: ${metadata.creator || '未知作者'}\n\n`;
            const chapters = [];

            for (const item of State.book.spine.items) {
                try {
                    const section = await State.book.load(item.href);
                    let content = section.documentElement?.textContent ||
                                   section.body?.textContent ||
                                   section.textContent || '';

                    content = content.trim();
                    if (!content) continue;

                    // 获取章节标题
                    let chapterTitle = TextReader._extractChapterTitle(navigation, item, content, chapters.length);

                    chapters.push({ title: chapterTitle, content });
                    allText += `\n\n## ${chapterTitle}\n\n${content}`;
                } catch (error) {
                    console.warn(`[${CONSTANTS.NS}] 加载章节失败:`, error);
                }
            }

            container.innerHTML = '';

            // 默认按章节分页
            const pages = Pagination.byChapter(allText);

            return { chapters, metadata, allText, pages };
        },

        /**
         * 提取章节标题
         */
        _extractChapterTitle: function(navigation, item, content, index) {
            // 尝试从导航获取
            if (Array.isArray(navigation)) {
                const navItem = navigation.find(nav => {
                    if (!nav || !nav.href || !item.href) return false;
                    return nav.href === item.href ||
                           nav.href.endsWith(item.href) ||
                           item.href.endsWith(nav.href);
                });
                if (navItem && navItem.label) return navItem.label;
            }
            if (item.title) return item.title;

            // 从内容提取
            const titleMatch = content.match(/<(h[1-6]|title)[^>]*>(.*?)<\/\1>/i);
            if (titleMatch) return titleMatch[2].trim();

            // 从文件名提取
            const fileName = item.href.split('/').pop().replace(/\.[^/.]+$/, '');
            return fileName || `第${index + 1}章`;
        },

        /**
         * 创建阅读器界面
         */
        _createInterface: function(targetDiv, pages, metadata, allText, charsPerPage) {
            targetDiv.innerHTML = '';
            targetDiv.style.cssText = `
                position: relative;
                height: 100%;
                display: flex;
                flex-direction: column;
            `;

            const textDisplay = document.createElement('div');
            textDisplay.id = CONSTANTS.IDs.TEXT_DISPLAY;
            textDisplay.style.cssText = `
                flex: 1;
                max-width: 800px;
                margin: 0 auto;
                padding: 20px;
                line-height: 1.8;
                font-family: Arial, sans-serif;
                font-size: 16px;
                white-space: pre-line;
                overflow-y: auto;
                height: calc(100vh - 120px);
            `;

            const content = document.createElement('div');
            content.id = CONSTANTS.IDs.PAGE_CONTENT;

            textDisplay.appendChild(TextReader._createHeader(metadata));
            textDisplay.appendChild(document.createElement('hr'));
            textDisplay.appendChild(content);
            targetDiv.appendChild(textDisplay);

            // 状态管理
            let currentPage = 0;
            let currentPages = pages;

            // 保存到全局
            const updateState = () => {
                window[CONSTANTS.NS + 'State'] = {
                    currentPage,
                    totalPages: currentPages.length,
                    charsPerPage
                };
                TextReader._updateProgressDisplay(currentPage, currentPages.length);
            };

            // 显示页面
            const displayPage = (pageIndex) => {
                if (pageIndex < 0) pageIndex = 0;
                if (pageIndex >= currentPages.length) pageIndex = currentPages.length - 1;

                currentPage = pageIndex;
                content.textContent = currentPages[pageIndex];
                textDisplay.scrollTop = 0;
                updateState();
            };

            // 重新分页
            const repaginate = (newCharsPerPage) => {
                const ratio = currentPages.length > 1 ? currentPage / (currentPages.length - 1) : 0;
                currentPages = newCharsPerPage === null
                    ? Pagination.byChapter(allText)
                    : Pagination.byChars(allText, newCharsPerPage);
                charsPerPage = newCharsPerPage;

                const newPage = Math.min(
                    Math.floor(ratio * Math.max(currentPages.length - 1, 1)),
                    currentPages.length - 1
                );
                displayPage(newPage);
            };

            // 键盘控制
            const handleKeydown = (event) => {
                // 文本模式键盘控制
                if (!State.isReaderActive) return;

                const isCmdOrCtrl = event.metaKey || event.ctrlKey;

                switch (event.key) {
                    case 'ArrowLeft':
                        event.preventDefault();
                        displayPage(currentPage - 1);
                        break;
                    case 'ArrowRight':
                        event.preventDefault();
                        displayPage(currentPage + 1);
                        break;
                    case '[':
                        if (isCmdOrCtrl) {
                            event.preventDefault();
                            displayPage(currentPage - 1);
                        }
                        break;
                    case ']':
                        if (isCmdOrCtrl) {
                            event.preventDefault();
                            displayPage(currentPage + 1);
                        }
                        break;
                }
            };

            // 先清理旧的键盘事件监听器
            if (State.keydownCleanup) {
                State.keydownCleanup();
            }

            document.addEventListener('keydown', handleKeydown);
            State.keydownCleanup = () => document.removeEventListener('keydown', handleKeydown);

            // 保存接口到全局
            const readerInterface = { displayPage, repaginate };
            window[CONSTANTS.NS + 'Interface'] = readerInterface;

            displayPage(0);
            return readerInterface;
        },

        /**
         * 创建书籍头部信息
         */
        _createHeader: function(metadata) {
            const wrapper = document.createElement('div');

            const title = document.createElement('h1');
            title.textContent = metadata.title || '未知标题';
            title.style.cssText = 'margin-bottom: 10px;';

            const author = document.createElement('p');
            author.innerHTML = `<strong>作者:</strong> ${metadata.creator || '未知作者'}`;
            author.style.cssText = 'margin-bottom: 20px; color: #666;';

            wrapper.appendChild(title);
            wrapper.appendChild(author);
            return wrapper;
        },

        /**
         * 更新进度显示
         */
        _updateProgressDisplay: function(currentPage, totalPages) {
            const progressEl = document.getElementById(CONSTANTS.IDs.READING_PROGRESS);
            if (progressEl && totalPages > 0) {
                const percentage = totalPages > 1
                    ? Math.round((currentPage / (totalPages - 1)) * 100)
                    : 100;
                progressEl.textContent = `第 ${currentPage + 1} / ${totalPages} (${percentage}%)`;
            }
        }
    };

    // ============================================================================
    // 键盘控制模块
    // ============================================================================

    const Keyboard = {
        /**
         * 添加键盘事件监听
         */
        bind: function() {
            document.addEventListener('keydown', Keyboard.handle);
        },

        /**
         * 移除键盘事件监听
         */
        unbind: function() {
            document.removeEventListener('keydown', Keyboard.handle);
        },

        /**
         * 处理键盘事件
         */
        handle: function(event) {
            // Cmd/Ctrl + B: 打开设置面板（始终可用）
            if ((event.metaKey || event.ctrlKey) && event.key === 'b') {
                event.preventDefault();
                Panel.create();
                return;
            }

            // 检查阅读器是否激活
            if (!State.isReaderActive) return;

            // 文本模式由内部处理
            if (State.keydownCleanup) return;

            // EPUB 模式翻页
            if (!State.rendition) return;

            const isCmdOrCtrl = event.metaKey || event.ctrlKey;

            switch (event.key) {
                case 'ArrowLeft':
                    event.preventDefault();
                    State.rendition.prev();
                    break;
                case 'ArrowRight':
                    event.preventDefault();
                    State.rendition.next();
                    break;
                case '[':
                    if (isCmdOrCtrl) {
                        event.preventDefault();
                        State.rendition.prev();
                    }
                    break;
                case ']':
                    if (isCmdOrCtrl) {
                        event.preventDefault();
                        State.rendition.next();
                    }
                    break;
            }
        }
    };

    // ============================================================================
    // 停止阅读器
    // ============================================================================

    function stopReader() {
        if (State.book) {
            State.book.destroy();
            State.book = null;
        }

        if (State.rendition) {
            State.rendition.destroy();
            State.rendition = null;
        }

        // 清理文本模式键盘事件
        if (State.keydownCleanup) {
            State.keydownCleanup();
            State.keydownCleanup = null;
        }

        // 移除容器
        const readerEl = document.getElementById(CONSTANTS.IDs.READER);
        if (readerEl) readerEl.remove();

        const textReaderEl = document.getElementById(CONSTANTS.IDs.TEXT_READER);
        if (textReaderEl) textReaderEl.remove();

        State.isReaderActive = false;

        // 清理全局状态
        window[CONSTANTS.NS + 'Interface'] = null;
        window[CONSTANTS.NS + 'State'] = null;
    }

    // ============================================================================
    // 初始化
    // ============================================================================

    /**
     * 确保依赖库在全局可用
     */
    function ensureLibraries() {
        if (typeof JSZip === 'undefined') {
            console.error(`[${CONSTANTS.NS}] JSZip 库未加载`);
            Utils.showNotification('JSZip库加载失败，请刷新页面', 'error');
            return false;
        }

        if (typeof unsafeWindow !== 'undefined') {
            unsafeWindow.JSZip = JSZip;
            unsafeWindow.ePub = ePub;
        } else {
            window.JSZip = JSZip;
            window.ePub = ePub;
        }

        return true;
    }

    /**
     * 主初始化函数
     */
    function init() {
        // 检查依赖
        if (!ensureLibraries()) return;

        // 注入样式
        injectStyles();

        // 绑定全局键盘事件
        Keyboard.bind();

        // 加载保存的设置
        const savedDiv = Utils.Storage.get(CONSTANTS.STORAGE.TARGET_DIV);
        if (savedDiv) {
            console.log(`[${CONSTANTS.NS}] 已加载上次使用的DIV选择器: ${savedDiv}`);
        }
    }

    // 页面加载完成后初始化
    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', init);
    } else {
        init();
    }

})(); // IIFE 结束