feat(auth): implement authentication middleware and token management

- Added middleware for handling authentication based on environment variables.
- Introduced functions for generating and managing authentication tokens.
- Updated summarization logic to support chunked processing with context limits.
- Enhanced settings modal to include context limit configuration for summarization.
- Improved PDF viewer to manage document loading states and prevent rendering during transitions.
- Added progress indicators for chunked summarization in the summarize modal.

.gitignore

@@ -44,6 +44,9 @@ next-env.d.ts
 # documents
 /docstore
 
+# auth token storage
+/.data
+
 # Playwright
 node_modules/
 /tests/results/

src/app/api/auth/route.ts

@@ -0,0 +1,21 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getAuthToken } from '@/lib/auth';
+
+export async function GET(request: NextRequest) {
+  const token = request.nextUrl.searchParams.get('token');
+  const returnTo = request.nextUrl.searchParams.get('returnTo') || '/';
+
+  if (token !== getAuthToken()) {
+    return NextResponse.json({ error: 'Invalid token' }, { status: 401 });
+  }
+
+  const response = NextResponse.redirect(new URL(returnTo, request.url));
+  response.cookies.set('auth_session', token, {
+    httpOnly: true,
+    secure: process.env.NODE_ENV === 'production',
+    sameSite: 'lax',
+    maxAge: 60 * 60 * 24 * 30,
+    path: '/',
+  });
+  return response;
+}

src/app/api/summarize/route.ts

@@ -22,6 +22,21 @@ Do not include any preamble like "Here is a summary" - just provide the summary
 Provide a comprehensive summary of the entire document content provided.
 Structure your summary with key themes, main arguments, and important conclusions.
 For longer texts, organize the summary into logical sections.
+Do not include any preamble like "Here is a summary" - just provide the summary directly.`,
+
+  // For summarizing individual chunks of a large document
+  chunk: `You are a helpful assistant that summarizes text content.
+This is a portion of a larger document. Provide a detailed summary of this section.
+Capture all key information, arguments, and details as they may be needed for the final summary.
+Focus on factual content and main points. Be thorough but concise.
+Do not include any preamble - just provide the summary directly.`,
+
+  // For combining chunk summaries into a final cohesive summary
+  final_pass: `You are a helpful assistant that creates comprehensive document summaries.
+You are given summaries of different sections of a document, separated by "---".
+Your task is to synthesize these section summaries into a single, cohesive, well-organized summary.
+Structure the final summary with clear sections covering key themes, main arguments, and important conclusions.
+Remove any redundancy while preserving all important information.
 Do not include any preamble like "Here is a summary" - just provide the summary directly.`,
 };
 
@@ -53,9 +68,9 @@ export async function POST(req: NextRequest) {
     }
 
     const body = (await req.json()) as SummarizeRequest;
-    const { text, mode, maxLength } = body;
+    const { text, mode, maxLength, isChunk, isFinalPass } = body;
 
-    console.log('Received summarize request:', { provider, modelId, mode, textLength: text?.length });
+    console.log('Received summarize request:', { provider, modelId, mode, textLength: text?.length, isChunk, isFinalPass });
 
     if (!text) {
       const errorBody: SummarizeError = {
@@ -73,10 +88,25 @@ export async function POST(req: NextRequest) {
       return NextResponse.json(errorBody, { status: 400 });
     }
 
-    const systemPrompt = SYSTEM_PROMPTS[mode] || SYSTEM_PROMPTS.current_page;
+    // Select appropriate prompt based on chunking mode
-    const userPrompt = maxLength
+    let systemPrompt: string;
-      ? `Please summarize the following text in approximately ${maxLength} words:\n\n${text}`
+    let userPrompt: string;
-      : `Please summarize the following text:\n\n${text}`;
+
+    if (isChunk) {
+      // Summarizing an individual chunk
+      systemPrompt = SYSTEM_PROMPTS.chunk;
+      userPrompt = `Please summarize this section of the document:\n\n${text}`;
+    } else if (isFinalPass) {
+      // Combining chunk summaries into final summary
+      systemPrompt = SYSTEM_PROMPTS.final_pass;
+      userPrompt = `Please synthesize these section summaries into a comprehensive document summary:\n\n${text}`;
+    } else {
+      // Normal summarization
+      systemPrompt = SYSTEM_PROMPTS[mode] || SYSTEM_PROMPTS.current_page;
+      userPrompt = maxLength
+        ? `Please summarize the following text in approximately ${maxLength} words:\n\n${text}`
+        : `Please summarize the following text:\n\n${text}`;
+    }
 
     let model;
 

src/components/PDFViewer.tsx

@@ -1,6 +1,6 @@
 'use client';
 
-import { RefObject, useCallback, useState, useEffect, useRef } from 'react';
+import { RefObject, useCallback, useState, useEffect, useRef, useMemo } from 'react';
 import { Document, Page } from 'react-pdf';
 import type { Dest } from 'react-pdf/src/shared/types.js';
 import 'react-pdf/dist/Page/AnnotationLayer.css';
@@ -47,8 +47,34 @@ export function PDFViewer({ zoomLevel }: PDFViewerProps) {
     currDocPages,
     currDocText,
     currDocPage,
+    pdfDocument,
   } = usePDF();
 
+  // Track document loading state to prevent rendering pages during transitions
+  const [isDocumentReady, setIsDocumentReady] = useState(false);
+  const documentKeyRef = useRef(0);
+  const lastDataRef = useRef<ArrayBuffer | undefined>(undefined);
+
+  // Reset ready state when document data changes
+  if (currDocData !== lastDataRef.current) {
+    lastDataRef.current = currDocData;
+    if (currDocData) {
+      documentKeyRef.current += 1;
+    }
+    if (isDocumentReady) {
+      setIsDocumentReady(false);
+    }
+  }
+
+  // Create a Uint8Array copy to prevent "detached ArrayBuffer" errors
+  const pdfFileData = useMemo(() => {
+    if (!currDocData) return undefined;
+    return { data: new Uint8Array(currDocData) };
+  }, [currDocData]);
+
+  // Only render pages when document is fully loaded and ready
+  const canRenderPages = isDocumentReady && pdfDocument && currDocPages;
+
   useEffect(() => {
     /*
      * Handles highlighting the current sentence being read by TTS.
@@ -165,11 +191,16 @@ export function PDFViewer({ zoomLevel }: PDFViewerProps) {
   return (
     <div ref={containerRef} className="flex flex-col items-center overflow-auto w-full px-6 h-full">
       <Document
+        key={documentKeyRef.current}
         loading={<DocumentSkeleton />}
         noData={<DocumentSkeleton />}
-        file={currDocData}
+        file={pdfFileData}
         onLoadSuccess={(pdf) => {
           onDocumentLoadSuccess(pdf);
+          setIsDocumentReady(true);
+        }}
+        onLoadError={() => {
+          // Ignore errors from destroyed documents during navigation/reload
         }}
         onItemClick={(args: PDFOnLinkClickArgs) => {
           if (args?.pageNumber) {
@@ -188,7 +219,7 @@ export function PDFViewer({ zoomLevel }: PDFViewerProps) {
           {viewType === 'scroll' ? (
             // Scroll mode: render all pages
             <div className="flex flex-col gap-4">
-              {currDocPages && [...Array(currDocPages)].map((_, i) => (
+              {canRenderPages && [...Array(currDocPages)].map((_, i) => (
                 <Page
                   key={`page_${i + 1}`}
                   pageNumber={i + 1}
@@ -206,7 +237,7 @@ export function PDFViewer({ zoomLevel }: PDFViewerProps) {
           ) : (
             // Single/Dual page mode
             <div className="flex justify-center gap-4">
-              {currDocPages && leftPage > 0 && (
+              {canRenderPages && leftPage > 0 && (
                 <Page
                   key={`page_${leftPage}`}
                   pageNumber={leftPage}
@@ -220,7 +251,7 @@ export function PDFViewer({ zoomLevel }: PDFViewerProps) {
                   }}
                 />
               )}
-              {currDocPages && rightPage && rightPage <= currDocPages && viewType === 'dual' && (
+              {canRenderPages && rightPage && rightPage <= currDocPages && viewType === 'dual' && (
                 <Page
                   key={`page_${rightPage}`}
                   pageNumber={rightPage}

src/components/SettingsModal.tsx

@@ -41,7 +41,7 @@ export function SettingsModal() {
   const [isOpen, setIsOpen] = useState(false);
 
   const { theme, setTheme } = useTheme();
-  const { apiKey, baseUrl, ttsProvider, ttsModel, ttsInstructions, updateConfig, updateConfigKey, summaryProvider, summaryModel, summaryApiKey, summaryBaseUrl } = useConfig();
+  const { apiKey, baseUrl, ttsProvider, ttsModel, ttsInstructions, updateConfig, updateConfigKey, summaryProvider, summaryModel, summaryApiKey, summaryBaseUrl, summaryContextLimit } = useConfig();
   const { clearPDFs, clearEPUBs, clearHTML } = useDocuments();
   const [localApiKey, setLocalApiKey] = useState(apiKey);
   const [localBaseUrl, setLocalBaseUrl] = useState(baseUrl);
@@ -54,6 +54,18 @@ export function SettingsModal() {
   const [localSummaryModel, setLocalSummaryModel] = useState(summaryModel);
   const [localSummaryApiKey, setLocalSummaryApiKey] = useState(summaryApiKey);
   const [localSummaryBaseUrl, setLocalSummaryBaseUrl] = useState(summaryBaseUrl);
+  const [localSummaryContextLimit, setLocalSummaryContextLimit] = useState(summaryContextLimit);
+  
+  // Context limit options
+  const contextLimitOptions = useMemo(() => [
+    { id: 4096, name: '4K tokens' },
+    { id: 8192, name: '8K tokens' },
+    { id: 16384, name: '16K tokens' },
+    { id: 32768, name: '32K tokens' },
+    { id: 65536, name: '64K tokens' },
+    { id: 131072, name: '128K tokens' },
+    { id: 200000, name: '200K tokens' },
+  ], []);
   const [isSyncing, setIsSyncing] = useState(false);
   const [isLoading, setIsLoading] = useState(false);
   const [showProgress, setShowProgress] = useState(false);
@@ -205,7 +217,8 @@ export function SettingsModal() {
     setLocalSummaryModel(summaryModel);
     setLocalSummaryApiKey(summaryApiKey);
     setLocalSummaryBaseUrl(summaryBaseUrl);
-  }, [apiKey, baseUrl, ttsProvider, ttsModel, ttsInstructions, checkFirstVist, summaryProvider, summaryModel, summaryApiKey, summaryBaseUrl]);
+    setLocalSummaryContextLimit(summaryContextLimit);
+  }, [apiKey, baseUrl, ttsProvider, ttsModel, ttsInstructions, checkFirstVist, summaryProvider, summaryModel, summaryApiKey, summaryBaseUrl, summaryContextLimit]);
 
   // Detect if current model is custom (not in presets) and mirror it in the input field
   useEffect(() => {
@@ -322,7 +335,8 @@ export function SettingsModal() {
     setLocalSummaryModel(summaryModel);
     setLocalSummaryApiKey(summaryApiKey);
     setLocalSummaryBaseUrl(summaryBaseUrl);
-  }, [apiKey, baseUrl, ttsProvider, ttsModel, ttsInstructions, ttsModels, summaryProvider, summaryModel, summaryApiKey, summaryBaseUrl]);
+    setLocalSummaryContextLimit(summaryContextLimit);
+  }, [apiKey, baseUrl, ttsProvider, ttsModel, ttsInstructions, ttsModels, summaryProvider, summaryModel, summaryApiKey, summaryBaseUrl, summaryContextLimit]);
 
   const tabs = [
     { name: 'API', icon: '🔑' },
@@ -367,7 +381,7 @@ export function SettingsModal() {
                 leaveFrom="opacity-100 scale-100"
                 leaveTo="opacity-0 scale-95"
               >
-                <DialogPanel className="w-full max-w-md transform rounded-2xl bg-base p-6 text-left align-middle shadow-xl transition-all">
+                <DialogPanel className="w-full max-w-md lg:max-w-lg transform rounded-2xl bg-base p-6 text-left align-middle shadow-xl transition-all">
                   <DialogTitle
                     as="h3"
                     className="text-lg font-semibold leading-6 text-foreground mb-4"
@@ -376,23 +390,27 @@ export function SettingsModal() {
                   </DialogTitle>
 
                   <TabGroup>
-                    <TabList className="flex flex-col sm:flex-col-none sm:flex-row gap-1 rounded-xl bg-background p-1 mb-4">
+                    <TabList className="grid grid-cols-2 lg:grid-cols-4 gap-1 rounded-xl bg-background p-1 mb-4">
                       {tabs.map((tab) => (
                         <Tab
                           key={tab.name}
                           className={({ selected }) =>
-                            `w-full rounded-lg py-1 text-sm font-medium
+                            `w-full rounded-lg py-2 px-2 text-sm font-medium transition-colors
-                             ring-accent/60 ring-offset-2 ring-offset-base
                              ${selected
-                              ? 'bg-accent text-background shadow'
+                              ? 'bg-accent shadow'
-                              : 'text-foreground hover:text-accent'
+                              : 'hover:bg-offbase/50'
                             }`
                           }
                         >
-                          <span className="flex items-center justify-center gap-2">
+                          {({ selected }) => (
-                            <span>{tab.icon}</span>
+                            <span 
-                            {tab.name}
+                              className="flex items-center justify-center gap-1.5"
-                          </span>
+                              style={{ color: selected ? 'var(--background)' : 'var(--foreground)' }}
+                            >
+                              <span>{tab.icon}</span>
+                              <span>{tab.name}</span>
+                            </span>
+                          )}
                         </Tab>
                       ))}
                     </TabList>
@@ -585,7 +603,7 @@ export function SettingsModal() {
                         <div className="pt-4 flex justify-end gap-2">
                           <Button
                             type="button"
-                            className="inline-flex justify-center rounded-lg bg-background px-3 py-1.5 text-sm 
+                            className="inline-flex justify-center rounded-lg bg-background px-3 py-1.5 text-sm
                                font-medium text-foreground hover:bg-offbase focus:outline-none 
                                focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-2
                                transform transition-transform duration-200 ease-in-out hover:scale-[1.04] hover:text-accent"
@@ -602,7 +620,7 @@ export function SettingsModal() {
                           </Button>
                           <Button
                             type="button"
-                             className="inline-flex justify-center rounded-lg bg-accent px-3 py-1.5 text-sm 
+                             className="inline-flex justify-center rounded-lg bg-accent px-3 py-1.5 text-sm
                                font-medium text-background hover:bg-secondary-accent focus:outline-none 
                                focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-2
                                transform transition-transform duration-200 ease-in-out hover:scale-[1.04] hover:text-background"
@@ -795,6 +813,62 @@ export function SettingsModal() {
                           </div>
                         )}
 
+                        <div className="space-y-1">
+                          <label className="block text-sm font-medium text-foreground">
+                            Context Limit
+                            <span className="ml-2 text-xs text-muted">(for chunked summarization)</span>
+                          </label>
+                          <Listbox
+                            value={contextLimitOptions.find(o => o.id === localSummaryContextLimit) || contextLimitOptions[3]}
+                            onChange={(option) => setLocalSummaryContextLimit(option.id)}
+                          >
+                            <ListboxButton className="relative w-full cursor-pointer rounded-lg bg-background py-1.5 pl-3 pr-10 text-left text-foreground shadow-sm focus:outline-none focus:ring-2 focus:ring-accent transform transition-transform duration-200 ease-in-out hover:scale-[1.009] hover:text-accent hover:bg-offbase">
+                              <span className="block truncate">
+                                {contextLimitOptions.find(o => o.id === localSummaryContextLimit)?.name || '32K tokens'}
+                              </span>
+                              <span className="pointer-events-none absolute inset-y-0 right-0 flex items-center pr-2">
+                                <ChevronUpDownIcon className="h-5 w-5 text-muted" />
+                              </span>
+                            </ListboxButton>
+                            <Transition
+                              as={Fragment}
+                              leave="transition ease-in duration-100"
+                              leaveFrom="opacity-100"
+                              leaveTo="opacity-0"
+                            >
+                              <ListboxOptions className="absolute mt-1 w-full overflow-auto rounded-md bg-background py-1 shadow-lg ring-1 ring-black/5 focus:outline-none z-50">
+                                {contextLimitOptions.map((option) => (
+                                  <ListboxOption
+                                    key={option.id}
+                                    className={({ active }) =>
+                                      `relative cursor-pointer select-none py-1.5 pl-10 pr-4 ${
+                                        active ? 'bg-offbase text-accent' : 'text-foreground'
+                                      }`
+                                    }
+                                    value={option}
+                                  >
+                                    {({ selected }) => (
+                                      <>
+                                        <span className={`block truncate ${selected ? 'font-medium' : 'font-normal'}`}>
+                                          {option.name}
+                                        </span>
+                                        {selected ? (
+                                          <span className="absolute inset-y-0 left-0 flex items-center pl-3 text-accent">
+                                            <CheckIcon className="h-5 w-5" />
+                                          </span>
+                                        ) : null}
+                                      </>
+                                    )}
+                                  </ListboxOption>
+                                ))}
+                              </ListboxOptions>
+                            </Transition>
+                          </Listbox>
+                          <p className="text-xs text-muted">
+                            Documents larger than this limit will be split into chunks and summarized hierarchically.
+                          </p>
+                        </div>
+
                         <div className="pt-4 flex justify-end gap-2">
                           <Button
                             type="button"
@@ -807,6 +881,7 @@ export function SettingsModal() {
                               setLocalSummaryModel('llama-3.3-70b-versatile');
                               setLocalSummaryApiKey('');
                               setLocalSummaryBaseUrl('');
+                              setLocalSummaryContextLimit(32768);
                             }}
                           >
                             Reset
@@ -822,6 +897,7 @@ export function SettingsModal() {
                               await updateConfigKey('summaryModel', localSummaryModel);
                               await updateConfigKey('summaryApiKey', localSummaryApiKey);
                               await updateConfigKey('summaryBaseUrl', localSummaryBaseUrl);
+                              await updateConfigKey('summaryContextLimit', localSummaryContextLimit);
                               setIsOpen(false);
                             }}
                           >

src/components/SummarizeModal.tsx

@@ -13,12 +13,15 @@ import {
   Radio,
   Label,
 } from '@headlessui/react';
+import ReactMarkdown from 'react-markdown';
+import remarkGfm from 'remark-gfm';
 import { CopyIcon, CheckIcon } from '@/components/icons/Icons';
+import { CodeBlock } from '@/components/CodeBlock';
 import { LoadingSpinner } from '@/components/Spinner';
 import { useConfig } from '@/contexts/ConfigContext';
 import { generateSummary } from '@/lib/summarize';
 import { saveSummary, getSummary } from '@/lib/dexie';
-import type { SummarizeMode, SummaryRow } from '@/types/summary';
+import type { SummarizeMode, SummaryRow, ChunkSummaryProgress } from '@/types/summary';
 
 interface SummarizeModalProps {
   isOpen: boolean;
@@ -45,7 +48,7 @@ export function SummarizeModal({
   totalPages,
   onExtractText,
 }: SummarizeModalProps) {
-  const { summaryProvider, summaryModel, summaryApiKey, summaryBaseUrl } = useConfig();
+  const { summaryProvider, summaryModel, summaryApiKey, summaryBaseUrl, summaryContextLimit } = useConfig();
 
   const [mode, setMode] = useState<SummarizeMode>('current_page');
   const [selectedPage, setSelectedPage] = useState<number>(currentPage);
@@ -54,6 +57,7 @@ export function SummarizeModal({
   const [error, setError] = useState<string | null>(null);
   const [copied, setCopied] = useState(false);
   const [savedSummary, setSavedSummary] = useState<SummaryRow | null>(null);
+  const [chunkProgress, setChunkProgress] = useState<ChunkSummaryProgress | null>(null);
 
   // Update selected page when current page changes
   useEffect(() => {
@@ -93,12 +97,13 @@ export function SummarizeModal({
     setError(null);
     setSummary('');
     setSavedSummary(null);
+    setChunkProgress(null);
 
     try {
       const pageNumber = mode === 'whole_book' ? undefined : (mode === 'current_page' ? currentPage : selectedPage);
       const text = await onExtractText(mode, pageNumber);
 
-      if (!text || text.trim().length === 0) {
+      if (!text?.trim()) {
         throw new Error('No text could be extracted from the document');
       }
 
@@ -107,11 +112,11 @@ export function SummarizeModal({
         apiKey: summaryApiKey,
         baseUrl: summaryBaseUrl,
         model: summaryModel,
-      });
+        contextLimit: summaryContextLimit,
+      }, undefined, setChunkProgress);
 
       setSummary(result.summary);
 
-      // Save to IndexedDB
       await saveSummary({
         docId,
         docType,
@@ -124,13 +129,13 @@ export function SummarizeModal({
         updatedAt: Date.now(),
       });
 
-      // Refresh saved summary state
       await checkSavedSummary();
     } catch (err) {
       console.error('Error generating summary:', err);
       setError(err instanceof Error ? err.message : 'Failed to generate summary');
     } finally {
       setIsGenerating(false);
+      setChunkProgress(null);
     }
   };
 
@@ -256,7 +261,11 @@ export function SummarizeModal({
                     {isGenerating ? (
                       <>
                         <LoadingSpinner />
-                        <span className="ml-2">Generating...</span>
+                        <span className="ml-2">
+                          {chunkProgress 
+                            ? chunkProgress.message 
+                            : 'Generating...'}
+                        </span>
                       </>
                     ) : savedSummary ? (
                       'Regenerate Summary'
@@ -265,6 +274,22 @@ export function SummarizeModal({
                     )}
                   </Button>
 
+                  {/* Chunk progress indicator */}
+                  {isGenerating && chunkProgress && chunkProgress.totalChunks > 1 && (
+                    <div className="space-y-2">
+                      <div className="flex justify-between text-xs text-muted">
+                        <span>{chunkProgress.message}</span>
+                        <span>{Math.round((chunkProgress.currentChunk / chunkProgress.totalChunks) * 100)}%</span>
+                      </div>
+                      <div className="w-full bg-offbase rounded-full h-2">
+                        <div 
+                          className="bg-accent h-2 rounded-full transition-all duration-300"
+                          style={{ width: `${(chunkProgress.currentChunk / chunkProgress.totalChunks) * 100}%` }}
+                        />
+                      </div>
+                    </div>
+                  )}
+
                   {/* Error display */}
                   {error && (
                     <div className="p-3 bg-red-500/10 border border-red-500/30 rounded-lg">
@@ -301,8 +326,34 @@ export function SummarizeModal({
                           )}
                         </Button>
                       </div>
-                      <div className="max-h-64 overflow-y-auto p-3 bg-background rounded-lg border border-offbase">
+                      <div className="max-h-64 overflow-y-auto p-3 bg-background rounded-lg border border-offbase
-                        <p className="text-sm text-foreground whitespace-pre-wrap">{summary}</p>
+                                      prose prose-sm dark:prose-invert max-w-none text-foreground
+                                      prose-headings:text-foreground prose-headings:font-semibold prose-headings:mt-3 prose-headings:mb-2
+                                      prose-p:text-foreground prose-p:my-1.5
+                                      prose-strong:text-foreground prose-em:text-foreground
+                                      prose-ul:text-foreground prose-ol:text-foreground prose-li:text-foreground prose-li:my-0.5
+                                      prose-a:text-accent hover:prose-a:text-secondary-accent
+                                      prose-blockquote:border-accent prose-blockquote:text-muted
+                                      prose-code:text-accent prose-code:bg-offbase prose-code:px-1 prose-code:py-0.5 prose-code:rounded prose-code:text-xs prose-code:before:content-none prose-code:after:content-none">
+                        <ReactMarkdown
+                          remarkPlugins={[remarkGfm]}
+                          components={{
+                            pre: ({ children }) => <>{children}</>,
+                            code: ({ className, children, ...props }) => {
+                              const match = /language-(\w+)/.exec(className || '');
+                              const isInline = !match && !className;
+                              return isInline ? (
+                                <code className={className} {...props}>
+                                  {children}
+                                </code>
+                              ) : (
+                                <CodeBlock>{String(children).replace(/\n$/, '')}</CodeBlock>
+                              );
+                            },
+                          }}
+                        >
+                          {summary}
+                        </ReactMarkdown>
                       </div>
                     </div>
                   )}

src/contexts/ConfigContext.tsx

@@ -40,6 +40,7 @@ interface ConfigContextType {
   summaryModel: string;
   summaryApiKey: string;
   summaryBaseUrl: string;
+  summaryContextLimit: number;
 }
 
 const ConfigContext = createContext<ConfigContextType | undefined>(undefined);
@@ -117,6 +118,7 @@ export function ConfigProvider({ children }: { children: ReactNode }) {
     summaryModel,
     summaryApiKey,
     summaryBaseUrl,
+    summaryContextLimit,
   } = config || APP_CONFIG_DEFAULTS;
 
   /**
@@ -221,6 +223,7 @@ export function ConfigProvider({ children }: { children: ReactNode }) {
       summaryModel,
       summaryApiKey,
       summaryBaseUrl,
+      summaryContextLimit,
     }}>
       {children}
     </ConfigContext.Provider>

src/instrumentation.ts

@@ -0,0 +1,6 @@
+export async function register() {
+  if (process.env.NEXT_RUNTIME === 'nodejs' && process.env.AUTH_ENABLED === 'true') {
+    const { printAuthUrl } = await import('@/lib/auth');
+    printAuthUrl();
+  }
+}

src/lib/auth.ts

@@ -0,0 +1,24 @@
+import { randomBytes } from 'crypto';
+import { existsSync, readFileSync, writeFileSync, mkdirSync } from 'fs';
+import path from 'path';
+
+const TOKEN_FILE = path.join(process.cwd(), '.data', '.auth-token');
+
+export function getAuthToken(): string {
+  const dir = path.dirname(TOKEN_FILE);
+  if (!existsSync(dir)) mkdirSync(dir, { recursive: true });
+
+  if (existsSync(TOKEN_FILE)) {
+    return readFileSync(TOKEN_FILE, 'utf-8').trim();
+  }
+
+  const token = randomBytes(32).toString('base64url');
+  writeFileSync(TOKEN_FILE, token);
+  return token;
+}
+
+export function printAuthUrl() {
+  const token = getAuthToken();
+  const port = process.env.PORT || 3000;
+  console.log('\n🔐 Auth URL: http://localhost:' + port + '?token=' + token + '\n');
+}

src/lib/pdf.ts

@@ -168,9 +168,6 @@ export async function extractTextFromPDF(
   margins = { header: 0.07, footer: 0.07, left: 0.07, right: 0.07 }
 ): Promise<string> {
   try {
-    // Log pdf worker version
-    //console.log('PDF worker version:', pdfjs.GlobalWorkerOptions.workerSrc);
-
     const page = await pdf.getPage(pageNumber);
     const textContent = await page.getTextContent();
     
@@ -271,6 +268,11 @@ export async function extractTextFromPDF(
 
     return pageText.replace(/\s+/g, ' ').trim();
   } catch (error) {
+    // Return empty string if document was destroyed during async operation
+    const msg = error instanceof Error ? error.message : '';
+    if (msg.includes('sendWithPromise') || msg.includes('destroyed')) {
+      return '';
+    }
     console.error('Error extracting text from PDF:', error);
     throw new Error('Failed to extract text from PDF');
   }

src/lib/summarize.ts

@@ -1,51 +1,123 @@
-import type { SummarizeMode, SummarizeResponse, SummarizeError } from '@/types/summary';
+import type { SummarizeMode, SummarizeResponse, SummarizeError, ChunkSummaryProgress } from '@/types/summary';
 
 export interface SummarizeOptions {
   provider: string;
   apiKey: string;
   baseUrl: string;
   model: string;
+  contextLimit?: number;
 }
 
-export async function generateSummary(
+// Estimate tokens (~4 chars per token)
+export const estimateTokens = (text: string): number => Math.ceil((text?.length || 0) / 4);
+
+// Max safe input (75% of limit for system prompt + output)
+const getMaxInputTokens = (limit: number): number => Math.floor(limit * 0.75);
+
+// Check if text needs chunking
+export const needsChunking = (text: string, contextLimit: number): boolean =>
+  estimateTokens(text) > getMaxInputTokens(contextLimit);
+
+// Split text into chunks by paragraphs/sentences
+function splitTextIntoChunks(text: string, maxTokens: number): string[] {
+  const maxChars = maxTokens * 4;
+  const chunks: string[] = [];
+  let current = '';
+
+  for (const para of text.split(/\n\n+/)) {
+    const trimmed = para.trim();
+    if (!trimmed) continue;
+
+    if ((current + '\n\n' + trimmed).length > maxChars) {
+      if (current) chunks.push(current.trim());
+      current = trimmed.length > maxChars 
+        ? trimmed.slice(0, maxChars) // Force split if paragraph too long
+        : trimmed;
+    } else {
+      current = current ? current + '\n\n' + trimmed : trimmed;
+    }
+  }
+  if (current.trim()) chunks.push(current.trim());
+  return chunks;
+}
+
+// Make API request
+async function callSummarizeAPI(
   text: string,
   mode: SummarizeMode,
   options: SummarizeOptions,
-  maxLength?: number
+  flags?: { isChunk?: boolean; isFinalPass?: boolean }
 ): Promise<SummarizeResponse> {
-  // Build headers, only include API key if explicitly set (otherwise server uses env vars)
   const headers: Record<string, string> = {
     'Content-Type': 'application/json',
     'x-summary-provider': options.provider,
     'x-summary-model': options.model,
   };
-
+  if (options.apiKey) headers['x-summary-api-key'] = options.apiKey;
-  // Only send API key if explicitly configured (empty = use server env var)
+  if (options.baseUrl) headers['x-summary-base-url'] = options.baseUrl;
-  if (options.apiKey) {
-    headers['x-summary-api-key'] = options.apiKey;
-  }
-
-  // Only send base URL if configured
-  if (options.baseUrl) {
-    headers['x-summary-base-url'] = options.baseUrl;
-  }
 
   const response = await fetch('/api/summarize', {
     method: 'POST',
     headers,
-    body: JSON.stringify({
+    body: JSON.stringify({ text, mode, ...flags }),
-      text,
-      mode,
-      maxLength,
-    }),
   });
 
   const data = await response.json();
-
+  if (!response.ok) throw new Error((data as SummarizeError).message || 'Failed to generate summary');
-  if (!response.ok) {
-    const error = data as SummarizeError;
-    throw new Error(error.message || 'Failed to generate summary');
-  }
-
   return data as SummarizeResponse;
 }
+
+// Main summarization function with automatic chunking
+export async function generateSummary(
+  text: string,
+  mode: SummarizeMode,
+  options: SummarizeOptions,
+  maxLength?: number,
+  onProgress?: (progress: ChunkSummaryProgress) => void
+): Promise<SummarizeResponse> {
+  const contextLimit = options.contextLimit || 32768;
+
+  // Direct summarization for small texts or non-whole-book modes
+  if (mode !== 'whole_book' || !needsChunking(text, contextLimit)) {
+    return callSummarizeAPI(text, mode, options);
+  }
+
+  // Hierarchical summarization for large documents
+  const maxInputTokens = getMaxInputTokens(contextLimit);
+  const chunks = splitTextIntoChunks(text, maxInputTokens);
+  
+  onProgress?.({ currentChunk: 0, totalChunks: chunks.length, phase: 'chunking', message: `Splitting into ${chunks.length} chunks...` });
+
+  // Summarize each chunk
+  const summaries: string[] = [];
+  let totalTokens = 0;
+
+  for (let i = 0; i < chunks.length; i++) {
+    onProgress?.({ currentChunk: i + 1, totalChunks: chunks.length, phase: 'summarizing', message: `Summarizing ${i + 1}/${chunks.length}...` });
+    const result = await callSummarizeAPI(chunks[i], 'whole_book', options, { isChunk: true });
+    summaries.push(result.summary);
+    totalTokens += result.tokensUsed || 0;
+  }
+
+  // Combine summaries (recursively if still too large)
+  onProgress?.({ currentChunk: chunks.length, totalChunks: chunks.length, phase: 'combining', message: 'Combining summaries...' });
+  
+  let combined = summaries.join('\n\n---\n\n');
+  while (needsChunking(combined, contextLimit)) {
+    const subChunks = splitTextIntoChunks(combined, maxInputTokens);
+    const subSummaries: string[] = [];
+    for (const chunk of subChunks) {
+      const result = await callSummarizeAPI(chunk, 'whole_book', options, { isChunk: true });
+      subSummaries.push(result.summary);
+      totalTokens += result.tokensUsed || 0;
+    }
+    combined = subSummaries.join('\n\n---\n\n');
+  }
+
+  // Final pass
+  const final = await callSummarizeAPI(combined, 'whole_book', options, { isFinalPass: true });
+  
+  onProgress?.({ currentChunk: chunks.length, totalChunks: chunks.length, phase: 'complete', message: 'Complete!' });
+
+  return { ...final, tokensUsed: totalTokens + (final.tokensUsed || 0), chunksProcessed: chunks.length, totalChunks: chunks.length };
+}

src/middleware.ts

@@ -0,0 +1,40 @@
+import { NextResponse } from 'next/server';
+import type { NextRequest } from 'next/server';
+
+export function middleware(request: NextRequest) {
+  // Auth disabled by default - set AUTH_ENABLED=true to enable
+  if (process.env.AUTH_ENABLED !== 'true') {
+    return NextResponse.next();
+  }
+
+  const { pathname, searchParams } = request.nextUrl;
+
+  // Skip static files and auth endpoint
+  if (pathname.startsWith('/_next') || pathname.startsWith('/api/auth') || pathname.match(/\.(ico|png|svg|jpg|jpeg|gif|webp|json)$/)) {
+    return NextResponse.next();
+  }
+
+  // Token in URL -> redirect to auth API
+  const token = searchParams.get('token');
+  if (token) {
+    const authUrl = new URL('/api/auth', request.url);
+    authUrl.searchParams.set('token', token);
+    authUrl.searchParams.set('returnTo', pathname);
+    return NextResponse.redirect(authUrl);
+  }
+
+  // Valid cookie -> allow
+  if (request.cookies.get('auth_session')?.value) {
+    return NextResponse.next();
+  }
+
+  // Unauthorized
+  return new NextResponse('Unauthorized - add ?token=YOUR_TOKEN to URL (check server logs)', {
+    status: 401,
+    headers: { 'Content-Type': 'text/plain' },
+  });
+}
+
+export const config = {
+  matcher: ['/((?!_next/static|_next/image).*)'],
+};

src/types/config.ts

@@ -35,6 +35,7 @@ export interface AppConfigValues {
   summaryModel: string;
   summaryApiKey: string;
   summaryBaseUrl: string;
+  summaryContextLimit: number; // Token limit for summarization
 }
 
 export const APP_CONFIG_DEFAULTS: AppConfigValues = {
@@ -73,6 +74,7 @@ export const APP_CONFIG_DEFAULTS: AppConfigValues = {
   summaryModel: 'llama-3.3-70b-versatile',
   summaryApiKey: '',
   summaryBaseUrl: '',
+  summaryContextLimit: 32768, // Default to 32k tokens
 };
 
 export interface AppConfigRow extends AppConfigValues {

src/types/summary.ts

@@ -1,8 +1,7 @@
 export type SummarizeMode = 'current_page' | 'select_page' | 'whole_book';
-export type SummaryProvider = 'openai' | 'anthropic' | 'custom-openai';
 
 export interface SummaryRow {
-  id: string;           // `${docId}-${scope}-${pageNumber ?? 'all'}`
+  id: string;
   docId: string;
   docType: 'pdf' | 'epub' | 'html';
   scope: 'page' | 'book';
@@ -18,6 +17,8 @@ export interface SummarizeRequest {
   text: string;
   mode: SummarizeMode;
   maxLength?: number;
+  isChunk?: boolean;
+  isFinalPass?: boolean;
 }
 
 export interface SummarizeResponse {
@@ -25,6 +26,8 @@ export interface SummarizeResponse {
   provider: string;
   model: string;
   tokensUsed?: number;
+  chunksProcessed?: number;
+  totalChunks?: number;
 }
 
 export interface SummarizeError {
@@ -32,3 +35,10 @@ export interface SummarizeError {
   message: string;
   details?: string;
 }
+
+export interface ChunkSummaryProgress {
+  currentChunk: number;
+  totalChunks: number;
+  phase: 'chunking' | 'summarizing' | 'combining' | 'complete';
+  message: string;
+}