// ==UserScript== // @name Playbook Analytics // @namespace https://github.com/Brandon123b/Playbook-Analytics // @version 1.0.0 // @description Track your Google Play Books reading sessions and visualize progress, pace, and ETA with interactive charts. // @author Brandon123b // @match https://play.google.com/books/reader* // @match https://books.googleusercontent.com/* // @match https://example.com/playlytics* // @icon https://www.google.com/s2/favicons?sz=64&domain=play.google.com // @grant GM_getValue // @grant GM_setValue // @grant GM_listValues // @grant GM_registerMenuCommand // @grant GM_openInTab // @license MIT // @homepageURL https://github.com/Brandon123b/Playbook-Analytics // @homepageURL https://greasyfork.org/en/scripts/575341-playbook-analytics // @supportURL https://github.com/Brandon123b/Playbook-Analytics/issues // @downloadURL https://raw.githubusercontent.com/Brandon123b/Playbook-Analytics/main/PlaybookAnalytics.user.js // @updateURL https://raw.githubusercontent.com/Brandon123b/Playbook-Analytics/main/PlaybookAnalytics.meta.js // @require https://cdn.jsdelivr.net/npm/chart.js@4.4.7/dist/chart.umd.min.js // @require https://cdn.jsdelivr.net/npm/hammerjs@2.0.8/hammer.min.js // @require https://cdn.jsdelivr.net/npm/chartjs-plugin-zoom@2.0.1/dist/chartjs-plugin-zoom.min.js // ==/UserScript== (function () { "use strict"; // ===== Configuration ===== const CONFIG = Object.freeze({ SESSION_GAP_MS: 5 * 60 * 1000, // 5 minutes between samples = new reading session GAP_BETWEEN_SESSIONS_MS: 30000, // Visual gap between sessions on the chart TRACK_INTERVAL_MS: 5000, // Safety-net poll for URL changes the History hooks miss IFRAME_POLL_MS: 2000, // How often the iframe re-scans for the page count IFRAME_MAX_ATTEMPTS: 30, // Give up scanning after this many tries (~1 minute) }); const MODES = Object.freeze({ IFRAME: "IFRAME", STATS: "STATS", READER: "READER", UNKNOWN: "UNKNOWN", }); const READER_ORIGIN = "https://play.google.com"; const IFRAME_ORIGIN = "https://books.googleusercontent.com"; const SESSION_COLORS = [ "#60a5fa", "#a78bfa", "#34d399", "#fbbf24", "#f87171", "#38bdf8", "#c084fc", "#4ade80", "#facc15", "#fb923c", ]; // ===== Logging ===== const LOG_PREFIX = "[Playbook Analytics]"; const log = (...args) => console.log(LOG_PREFIX, ...args); // ===== Shared storage ===== // booksData: { [bookTitle]: [{ page, timestamp }, ...] } // booksMetadata: { [bookTitle]: { totalPages, ... } } const Storage = { getAllBooksData: () => GM_getValue("booksData", {}), getAllBooksMetadata: () => GM_getValue("booksMetadata", {}), getBookData: (title) => Storage.getAllBooksData()[title] || [], getBookMetadata: (title) => Storage.getAllBooksMetadata()[title] || {}, saveBookData(title, data) { const all = Storage.getAllBooksData(); all[title] = data; GM_setValue("booksData", all); }, saveBookMetadata(title, metadata) { const all = Storage.getAllBooksMetadata(); all[title] = { ...all[title], ...metadata }; GM_setValue("booksMetadata", all); }, deleteBook(title) { const data = Storage.getAllBooksData(); delete data[title]; GM_setValue("booksData", data); const meta = Storage.getAllBooksMetadata(); delete meta[title]; GM_setValue("booksMetadata", meta); }, deleteAll() { GM_setValue("booksData", {}); GM_setValue("booksMetadata", {}); }, }; // ===== Iframe mode ===== // Runs inside the Google Books rendering iframe to detect total pages // and forward them up to the reader page. function initIframeMode() { log("Iframe mode initialized"); function detectTotalPages() { const text = document.body?.innerText || ""; const slashPattern = text.match(/(\d+)(?:[–\-](\d+))?\s*\/\s*(\d+)/); if (slashPattern) return parseInt(slashPattern[3], 10); for (const el of document.querySelectorAll("[aria-label]")) { const label = el.getAttribute("aria-label"); const match = label && label.match(/(\d+)(?:[–\-](\d+))?\s*\/\s*(\d+)/); if (match) return parseInt(match[3], 10); } return null; } let attempts = 0; let intervalId = null; function send() { attempts++; const totalPages = detectTotalPages(); if (totalPages) { try { window.parent.postMessage({ type: "GPB_TOTAL_PAGES", totalPages }, READER_ORIGIN); } catch (_) { /* parent may be gone */ } if (intervalId) clearInterval(intervalId); } else if (attempts >= CONFIG.IFRAME_MAX_ATTEMPTS) { if (intervalId) clearInterval(intervalId); } } intervalId = setInterval(send, CONFIG.IFRAME_POLL_MS); setTimeout(send, 1000); } // ===== Stats mode ===== // Standalone analytics dashboard. Wipes the page and renders a custom UI. const STATS_CSS = ` *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; } html, body { width: 100%; min-height: 100vh; } body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%); color: #e8e8e8; padding: 20px; } .container { max-width: 1400px; margin: 0 auto; } header { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 20px; margin-bottom: 30px; padding-bottom: 20px; border-bottom: 1px solid #334155; } h1 { font-size: 2em; background: linear-gradient(90deg, #60a5fa, #a78bfa); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; } .controls { display: flex; gap: 15px; align-items: center; flex-wrap: wrap; } select, button { padding: 10px 16px; border-radius: 8px; border: 1px solid #475569; background: #1e293b; color: #e2e8f0; font-size: 14px; cursor: pointer; transition: all 0.2s; } select:hover, button:hover { background: #334155; border-color: #60a5fa; } select { min-width: 250px; } .btn-danger { background: #7f1d1d; border-color: #991b1b; } .btn-danger:hover { background: #991b1b; border-color: #dc2626; } .btn-refresh { background: #065f46; border-color: #047857; } .btn-refresh:hover { background: #047857; border-color: #10b981; } .stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-bottom: 30px; } .stat-card { background: #1e293b; border-radius: 12px; padding: 20px; text-align: center; border: 1px solid #334155; } .stat-value { font-size: 2em; font-weight: bold; color: #60a5fa; margin-bottom: 5px; } .stat-label { color: #94a3b8; font-size: 0.9em; } .chart-container { background: #0f172a; border-radius: 16px; padding: 30px; box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3); margin-bottom: 30px; } .chart-title { color: #94a3b8; font-size: 1.1em; margin-bottom: 15px; font-weight: 500; } #readingChart { width: 100% !important; height: 500px !important; } #dailyChart { width: 100% !important; height: 300px !important; } .no-data { text-align: center; padding: 50px; color: #94a3b8; } `; const STATS_HTML = `

📚 Playbook Analytics

-
Page Progress
-
% Complete
-
Pages Left
-
Reading Time
-
Avg Pages/Hour
-
Est. Time Left
-
Fastest Session
-
Sessions
📈 Reading Progress
📅 Pages Read Per Day
`; const NO_DATA_HTML = `

📚 No Reading Data Yet

Start reading a book to track your progress!

`; function formatDuration(ms) { const hours = Math.floor(ms / 3600000); const mins = Math.floor((ms % 3600000) / 60000); return hours > 0 ? `${hours}h ${mins}m` : `${mins}m`; } // Group raw page samples into sessions (gap > SESSION_GAP_MS = new session) // and build the chart series with synthetic, gap-padded x coordinates. function processBookData(data, totalPagesInBook) { if (!data || data.length === 0) return { sessions: [], chartData: [], sessionStats: [] }; const sorted = data.slice().sort((a, b) => a.timestamp - b.timestamp); const sessions = []; let currentSession = [sorted[0]]; for (let i = 1; i < sorted.length; i++) { if (sorted[i].timestamp - sorted[i - 1].timestamp > CONFIG.SESSION_GAP_MS) { sessions.push(currentSession); currentSession = [sorted[i]]; } else { currentSession.push(sorted[i]); } } sessions.push(currentSession); const sessionStats = sessions.map((session) => { const duration = session.length > 1 ? session[session.length - 1].timestamp - session[0].timestamp : 0; const pages = session.map((p) => p.page); const pagesRead = pages.reduce((a, b) => Math.max(a, b)) - pages.reduce((a, b) => Math.min(a, b)); const pagesPerMin = duration > 0 ? pagesRead / (duration / 60000) : 0; return { duration, pagesRead, pagesPerMin }; }); const chartData = []; let cumTime = 0; let prevTimestamp = null; sessions.forEach((session, idx) => { const start = session[0].timestamp; const stats = sessionStats[idx]; session.forEach((pt, ptIdx) => { let timeOnPage = 0; if (ptIdx > 0) { timeOnPage = pt.timestamp - session[ptIdx - 1].timestamp; } else if (prevTimestamp && pt.timestamp - prevTimestamp < CONFIG.SESSION_GAP_MS) { timeOnPage = pt.timestamp - prevTimestamp; } const percentComplete = totalPagesInBook ? (pt.page / totalPagesInBook * 100) : null; chartData.push({ x: cumTime + (pt.timestamp - start), y: pt.page, realTime: pt.timestamp, sessionIdx: idx, sessionPagesPerMin: stats.pagesPerMin, timeOnPage, percentComplete, }); prevTimestamp = pt.timestamp; }); cumTime += (session[session.length - 1].timestamp - start) + CONFIG.GAP_BETWEEN_SESSIONS_MS; }); return { sessions, chartData, sessionStats }; } function calculateStats(sessions, totalPagesInBook) { if (!sessions.length) { return { pages: 0, time: 0, speed: 0, count: 0, currentPage: 0, percentComplete: 0, pagesRemaining: 0, estTimeToFinish: 0, fastestSessionSpeed: 0, totalPagesInBook, }; } let totalTime = 0; let minPage = Infinity; let maxPage = -Infinity; let fastestSpeed = 0; sessions.forEach((session) => { const dur = session.length > 1 ? session[session.length - 1].timestamp - session[0].timestamp : 0; if (dur > 0) { totalTime += dur; const pages = session.map((p) => p.page); const sp = pages.reduce((a, b) => Math.max(a, b)) - pages.reduce((a, b) => Math.min(a, b)); const spd = sp / (dur / 3600000); if (spd > fastestSpeed) fastestSpeed = spd; } session.forEach((p) => { if (p.page < minPage) minPage = p.page; if (p.page > maxPage) maxPage = p.page; }); }); const pagesRead = maxPage - minPage; const hours = totalTime / 3600000; const speed = hours > 0 ? pagesRead / hours : 0; let pct = 0; let remaining = 0; let est = 0; if (totalPagesInBook) { pct = (maxPage / totalPagesInBook) * 100; remaining = Math.max(0, totalPagesInBook - maxPage); if (speed > 0) est = (remaining / speed) * 3600000; } return { pages: pagesRead, time: totalTime, speed, count: sessions.length, currentPage: maxPage, percentComplete: pct, pagesRemaining: remaining, estTimeToFinish: est, fastestSessionSpeed: fastestSpeed, totalPagesInBook, }; } // Aggregate raw samples into per-day pages-read totals, filling in zero-days. function calculateDailyPages(data) { if (!data || data.length === 0) return { labels: [], pages: [] }; // Parse YYYY-MM-DD as local time; new Date("YYYY-MM-DD") is interpreted as UTC. const localKey = (d) => `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, "0")}-${String(d.getDate()).padStart(2, "0")}`; const parseLocalDate = (s) => { const [y, m, d] = s.split("-").map(Number); return new Date(y, m - 1, d); }; const sorted = data.slice().sort((a, b) => a.timestamp - b.timestamp); const dailyData = {}; sorted.forEach((pt) => { const key = localKey(new Date(pt.timestamp)); if (!dailyData[key]) { dailyData[key] = { min: pt.page, max: pt.page }; } else { if (pt.page < dailyData[key].min) dailyData[key].min = pt.page; if (pt.page > dailyData[key].max) dailyData[key].max = pt.page; } }); const dates = Object.keys(dailyData).sort(); if (dates.length === 0) return { labels: [], pages: [] }; const startDate = parseLocalDate(dates[0]); const endDate = parseLocalDate(dates[dates.length - 1]); const labels = []; const pages = []; for (let cur = new Date(startDate); cur <= endDate; cur.setDate(cur.getDate() + 1)) { const key = localKey(cur); labels.push(`${cur.getMonth() + 1}/${cur.getDate()}`); pages.push(dailyData[key] ? dailyData[key].max - dailyData[key].min : 0); } return { labels, pages }; } function initStatsMode() { log("Stats mode initialized"); // Wipe the page entirely - we are rendering a standalone dashboard. document.head.replaceChildren(); document.body.replaceChildren(); document.title = "📚 Playbook Analytics"; const style = document.createElement("style"); style.textContent = STATS_CSS; document.head.appendChild(style); let booksData = Storage.getAllBooksData(); let booksMetadata = Storage.getAllBooksMetadata(); const bookTitles = Object.keys(booksData); if (bookTitles.length === 0) { document.body.innerHTML = NO_DATA_HTML; return; } document.body.innerHTML = STATS_HTML; const bookSelect = document.getElementById("bookSelect"); let currentChart = null; let dailyChart = null; // Rebuild the dropdown from current booksData. Preserves the user's // selection if that book still exists; otherwise falls back to the first. function populateBookSelect() { const previousValue = bookSelect.value; const titles = Object.keys(booksData); bookSelect.replaceChildren(); titles.forEach((title) => { const opt = document.createElement("option"); opt.value = title; opt.textContent = title; bookSelect.appendChild(opt); }); if (titles.includes(previousValue)) { bookSelect.value = previousValue; } return titles; } populateBookSelect(); function renderChart(bookTitle) { const data = booksData[bookTitle] || []; const meta = booksMetadata[bookTitle] || {}; const { chartData, sessions } = processBookData(data, meta.totalPages); const stats = calculateStats(sessions, meta.totalPages); const currentPg = stats.currentPage || "-"; const totalPg = stats.totalPagesInBook || "?"; document.getElementById("pageProgress").textContent = `${currentPg} / ${totalPg}`; document.getElementById("percentComplete").textContent = stats.totalPagesInBook ? `${stats.percentComplete.toFixed(1)}%` : "-"; document.getElementById("pagesRemaining").textContent = stats.totalPagesInBook ? stats.pagesRemaining : "-"; document.getElementById("totalTime").textContent = formatDuration(stats.time); document.getElementById("avgSpeed").textContent = stats.speed.toFixed(1); document.getElementById("estTimeToFinish").textContent = stats.estTimeToFinish > 0 ? formatDuration(stats.estTimeToFinish) : "-"; document.getElementById("fastestSession").textContent = stats.fastestSessionSpeed > 0 ? `${stats.fastestSessionSpeed.toFixed(1)} p/h` : "-"; document.getElementById("sessionCount").textContent = stats.count; const groups = {}; chartData.forEach((pt) => { if (!groups[pt.sessionIdx]) groups[pt.sessionIdx] = []; groups[pt.sessionIdx].push(pt); }); const datasets = Object.keys(groups).map((idx) => { const color = SESSION_COLORS[idx % SESSION_COLORS.length]; return { label: `Session ${parseInt(idx, 10) + 1}`, data: groups[idx], borderColor: color, backgroundColor: color + "40", pointBackgroundColor: color, pointRadius: 4, borderWidth: 2, tension: 0.1, fill: false, }; }); if (currentChart) currentChart.destroy(); currentChart = new Chart(document.getElementById("readingChart").getContext("2d"), { type: "line", data: { datasets }, options: { responsive: true, maintainAspectRatio: false, interaction: { mode: "nearest", axis: "x", intersect: false }, scales: { x: { type: "linear", title: { display: true, text: "Reading Time", color: "#94a3b8" }, ticks: { color: "#94a3b8", callback: (v) => { const m = Math.floor(v / 60000); return `${Math.floor(m / 60)}h ${m % 60}m`; }, }, grid: { color: "#334155" }, }, y: { title: { display: true, text: "Page", color: "#94a3b8" }, ticks: { color: "#94a3b8" }, grid: { color: "#334155" }, }, }, plugins: { tooltip: { enabled: true, backgroundColor: "#1e293b", titleColor: "#60a5fa", bodyColor: "#e2e8f0", borderColor: "#475569", borderWidth: 2, padding: { top: 16, bottom: 16, left: 20, right: 20 }, titleFont: { size: 18, weight: "bold" }, bodyFont: { size: 15 }, titleMarginBottom: 12, bodySpacing: 8, boxPadding: 6, callbacks: { title: (c) => `Page ${c[0].raw.y}`, label: (c) => { const lines = []; lines.push(`🕐 ${new Date(c.raw.realTime).toLocaleString()}`); if (c.raw.percentComplete !== null) { lines.push(`📊 ${c.raw.percentComplete.toFixed(1)}% complete`); } if (c.raw.timeOnPage > 0) { const secs = Math.round(c.raw.timeOnPage / 1000); const mins = Math.floor(secs / 60); const remSecs = secs % 60; const timeStr = mins > 0 ? `${mins}m ${remSecs}s` : `${secs}s`; lines.push(`⏱️ ${timeStr} on page`); } if (c.raw.sessionPagesPerMin) { lines.push(`⚡ ${c.raw.sessionPagesPerMin.toFixed(2)} pages/min`); } return lines; }, }, }, legend: { display: false }, zoom: { pan: { enabled: true, mode: "xy", modifierKey: null }, zoom: { wheel: { enabled: true }, pinch: { enabled: true }, mode: "xy" }, }, }, }, }); const daily = calculateDailyPages(data); if (dailyChart) dailyChart.destroy(); dailyChart = new Chart(document.getElementById("dailyChart").getContext("2d"), { type: "bar", data: { labels: daily.labels, datasets: [{ label: "Pages Read", data: daily.pages, backgroundColor: daily.pages.map((p) => p > 0 ? "#60a5fa" : "#334155"), borderColor: daily.pages.map((p) => p > 0 ? "#3b82f6" : "#475569"), borderWidth: 1, borderRadius: 4, }], }, options: { responsive: true, maintainAspectRatio: false, scales: { x: { title: { display: true, text: "Date", color: "#94a3b8" }, ticks: { color: "#94a3b8", maxRotation: 45, minRotation: 45 }, grid: { color: "#334155" }, }, y: { title: { display: true, text: "Pages", color: "#94a3b8" }, ticks: { color: "#94a3b8" }, grid: { color: "#334155" }, beginAtZero: true, }, }, plugins: { tooltip: { enabled: true, backgroundColor: "#1e293b", titleColor: "#60a5fa", bodyColor: "#e2e8f0", borderColor: "#475569", borderWidth: 1, padding: 12, callbacks: { label: (c) => `${c.raw} pages` }, }, legend: { display: false }, }, }, }); } bookSelect.addEventListener("change", () => renderChart(bookSelect.value)); document.getElementById("refreshData").addEventListener("click", () => { booksData = Storage.getAllBooksData(); booksMetadata = Storage.getAllBooksMetadata(); const titles = populateBookSelect(); if (titles.length === 0) { document.body.innerHTML = NO_DATA_HTML; return; } renderChart(bookSelect.value); const btn = document.getElementById("refreshData"); btn.textContent = "✅ Updated!"; setTimeout(() => { btn.textContent = "🔄 Refresh"; }, 1500); }); document.getElementById("resetZoom").addEventListener("click", () => { if (currentChart) currentChart.resetZoom(); }); document.getElementById("deleteBook").addEventListener("click", () => { if (confirm(`Delete "${bookSelect.value}"?`)) { Storage.deleteBook(bookSelect.value); location.reload(); } }); document.getElementById("deleteAll").addEventListener("click", () => { if (confirm("Delete ALL data?")) { Storage.deleteAll(); location.reload(); } }); renderChart(bookTitles[0]); } // ===== Reader mode ===== // Runs on the Play Books reader. Watches URL changes for page transitions // and persists samples to GM storage. function initReaderMode() { log("Reader mode initialized"); let lastPage = null; let currentBookTitle = null; function getBookTitle() { const pageTitle = document.title; if (pageTitle && pageTitle !== "Google Play Books") { const trimmed = pageTitle.replace(/ - Google Play Books$/, "").trim(); if (trimmed) return trimmed; } const urlMatch = window.location.href.match(/[?&]id=([^&]+)/); if (urlMatch) return `Book_${urlMatch[1]}`; return "Unknown Book"; } function getCurrentPage() { const match = window.location.href.match(/pg=GBS\.PA(\d+)/); return match ? parseInt(match[1], 10) : null; } function getTotalPages() { const extractTotal = (text) => { if (!text) return null; const slashPattern = text.match(/(\d+)(?:[–\-](\d+))?\s*\/\s*(\d+)/); if (slashPattern) return parseInt(slashPattern[3], 10); const ofPattern = text.match(/(?:page\s+)?(\d+)\s+of\s+(\d+)/i); if (ofPattern) return parseInt(ofPattern[2], 10); return null; }; const fromBody = extractTotal(document.body.innerText || ""); if (fromBody) return fromBody; for (const el of document.querySelectorAll("[aria-label], [title]")) { const fromAria = extractTotal(el.getAttribute("aria-label")); if (fromAria) return fromAria; const fromTitle = extractTotal(el.getAttribute("title")); if (fromTitle) return fromTitle; } for (const iframe of document.querySelectorAll("iframe")) { try { const doc = iframe.contentDocument || iframe.contentWindow.document; if (!doc || !doc.body) continue; const fromIframeBody = extractTotal(doc.body.innerText || ""); if (fromIframeBody) return fromIframeBody; for (const el of doc.querySelectorAll("[aria-label]")) { const fromIframeAria = extractTotal(el.getAttribute("aria-label")); if (fromIframeAria) return fromIframeAria; } } catch (_) { /* cross-origin */ } } const urlMatch = window.location.href.match(/[?&]total=(\d+)/); if (urlMatch) return parseInt(urlMatch[1], 10); return null; } function trackPageChange() { const page = getCurrentPage(); if (page === null) return; if (!currentBookTitle) currentBookTitle = getBookTitle(); if (page !== lastPage) { lastPage = page; const data = Storage.getBookData(currentBookTitle); data.push({ page, timestamp: Date.now() }); Storage.saveBookData(currentBookTitle, data); } const totalPages = getTotalPages(); if (totalPages) { const meta = Storage.getBookMetadata(currentBookTitle); if (!meta.totalPages || totalPages > meta.totalPages) { Storage.saveBookMetadata(currentBookTitle, { totalPages }); } } } function onNavigation() { // Title may have changed (different book) - re-detect lazily. currentBookTitle = null; trackPageChange(); } // Watch for SPA navigation. Play Books mutates the URL via the History API, // so plain popstate is not enough - we also wrap pushState/replaceState. window.addEventListener("popstate", onNavigation); window.addEventListener("hashchange", onNavigation); const originalPushState = history.pushState; history.pushState = function () { originalPushState.apply(this, arguments); onNavigation(); }; const originalReplaceState = history.replaceState; history.replaceState = function () { originalReplaceState.apply(this, arguments); onNavigation(); }; // Listen for total-page hints from the books.googleusercontent.com iframe. window.addEventListener("message", (event) => { if (event.origin !== IFRAME_ORIGIN) return; if (!event.data || event.data.type !== "GPB_TOTAL_PAGES" || !event.data.totalPages) return; const title = getBookTitle(); const meta = Storage.getBookMetadata(title); if (!meta.totalPages || event.data.totalPages !== meta.totalPages) { Storage.saveBookMetadata(title, { totalPages: event.data.totalPages }); } }); // Initial sample plus a low-frequency safety net for any URL change the // History hooks somehow miss. trackPageChange(); setInterval(trackPageChange, CONFIG.TRACK_INTERVAL_MS); // ----- Menu commands ----- GM_registerMenuCommand("📊 Open Playbook Analytics", () => { GM_openInTab("https://example.com/playlytics", { active: true }); }); GM_registerMenuCommand("🗑️ Delete Current Book Data", () => { const title = getBookTitle(); if (confirm(`Delete all reading data for "${title}"?`)) { Storage.deleteBook(title); alert("Data deleted!"); } }); GM_registerMenuCommand("⚠️ Delete All Reading Data", () => { if (confirm("DELETE ALL reading data for ALL books? This cannot be undone!")) { Storage.deleteAll(); alert("All reading data deleted!"); } }); } // ===== Mode dispatch ===== // Must run AFTER all const declarations above so the init functions can // safely reference them (const has a temporal dead zone, unlike var). function getMode() { const hostname = window.location.hostname; if (hostname === "books.googleusercontent.com") return MODES.IFRAME; if (hostname === "example.com") return MODES.STATS; if (hostname === "play.google.com") return MODES.READER; return MODES.UNKNOWN; } switch (getMode()) { case MODES.IFRAME: initIframeMode(); break; case MODES.STATS: initStatsMode(); break; case MODES.READER: initReaderMode(); break; } })();