Fix subtitle filename patterns and update port number

Updated subtitle filename matching patterns and local development port.

README.md

@@ -42,6 +42,7 @@
 - [Security Notes](#security-notes)
 - [Support the Project](#support-the-project)
 - [License](#license)
+- [Changelog](#changelog)
 
 ---
 
@@ -354,7 +355,7 @@ For a NAS, USB datastore, or other external drive, change only the left side of
 
 ```yaml
 volumes:
-  - /mnt/usb-datastore/courses:/app/My_Courses
+  - /path/to/your/courses:/app/My_Courses
   - ./prisma_data:/app/prisma/data
 ```
 
@@ -445,6 +446,9 @@ My_Courses/
     │   └── 01 - Welcome.mp4
     ├── 02 - Core Concepts/
     │   ├── 01 - Lesson One.mp4
+    │   ├── 01 - Lesson One.en.vtt
+    │   ├── 01 - Lesson One.es.vtt
+    │   ├── 01 - Lesson One.ja.vtt
     │   └── 02 - Lesson Two.mp4
     └── 03 - Practice/
         └── 01 - Lab Walkthrough.mp4
@@ -452,6 +456,29 @@ My_Courses/
 
 Supported video extensions include common browser-playable formats such as `.mp4`, plus additional local media formats depending on browser support.
 
+### Subtitles
+
+OfflineAcademy supports subtitle files stored beside the matching video. `.vtt` files are served directly; `.srt` files are detected and converted to browser-compatible WebVTT when served to the video player.
+
+Single subtitle track:
+
+```text
+01 - Lesson.mp4
+01 - Lesson.vtt
+```
+
+Multiple language tracks:
+
+```text
+01 - Lesson.mp4
+01 - Lesson.en.vtt
+01 - Lesson.es.vtt
+01 - Lesson.ja.vtt
+01 - Lesson.fil.vtt
+```
+
+Language suffixes become selectable tracks in the video player settings menu. Examples: `en`, `es`, `fr`, `ja`, `fil`, `zh-CN`, `pt-BR`.
+
 ---
 
 ## Data & Persistence
@@ -551,3 +578,31 @@ OfflineAcademy is released under the **MIT License**.
 You are free to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the software, subject to the terms of the MIT License.
 
 See [`LICENSE`](LICENSE) for the full license text.
+
+---
+
+## Changelog
+
+### v1.0.2 — Subtitle & Analytics Polish
+
+This release focuses on making OfflineAcademy smoother for real course libraries, especially Udemy-style folders with external subtitle files.
+
+#### Added
+
+- Multi-language subtitle support for local course videos.
+- SRT and VTT subtitle detection during course scans.
+- Visible subtitle controls in the video player when tracks are available.
+- Support for multiple subtitle tracks per lesson, such as English and Persian.
+
+#### Fixed
+
+- Same-folder subtitle imports for files stored outside the app container and mounted into the course library.
+- Subtitle filename matching for common Udemy-style exports, including patterns like `-english-test.us.srt` and `-persian-test.us.srt`.
+- Lesson API subtitle ordering so tracks load consistently in the player.
+- Analytics page data loading by reading analytics directly on the server instead of relying on a fragile internal fetch.
+
+#### Improved
+
+- Course scanning now better handles real-world course folder layouts.
+- Subtitle files are served as browser-compatible `text/vtt`, including converted SRT files.
+- Local development workflow was verified on port `6969` after cache cleanup and rebuild.

app/analytics/page.tsx

@@ -1,5 +1,6 @@
 import type { Metadata } from 'next'
 import { Header } from '@/components/Header'
+import { getAnalyticsData } from '@/lib/analytics'
 import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card'
 import { Progress } from '@/components/ui/progress'
 import { Badge } from '@/components/ui/badge'
@@ -23,35 +24,6 @@ export const metadata: Metadata = {
   description: 'Learning analytics and progress overview.',
 }
 
-interface AnalyticsData {
-  totalCourses: number
-  completedCourses: number
-  inProgressCourses: number
-  totalLessons: number
-  completedLessons: number
-  inProgressLessons: number
-  notStartedLessons: number
-  totalWatchedHours: number
-  totalWatchedMinutes: number
-  weeklyWatchedHours: number
-  weeklyWatchedMinutes: number
-  weeklyCompletedLessons: number
-  lessonsByType: Array<{ type: string; _count: number }>
-  completedByType: Record<string, number>
-  completionRate: number
-  lessonCompletionRate: number
-}
-
-async function getAnalyticsData(): Promise<AnalyticsData> {
-  const res = await fetch('http://127.0.0.1:6767/api/progress?type=analytics', {
-    cache: 'no-store',
-  })
-  if (!res.ok) {
-    throw new Error('Failed to fetch analytics')
-  }
-  return res.json()
-}
-
 const lessonTypeIcons: Record<string, React.ReactNode> = {
   VIDEO: <Film className="h-4 w-4 text-red-400" />,
   AUDIO: <Music className="h-4 w-4 text-purple-400" />,

app/api/files/[...path]/route.ts

@@ -1,8 +1,9 @@
 import { NextRequest, NextResponse } from 'next/server'
-import { prisma } from '@/lib/prisma'
 import { existsSync, statSync, createReadStream } from 'fs'
+import { readFile } from 'fs/promises'
 import { join, resolve } from 'path'
 import { getCoursesRootPath } from '@/lib/scanner'
+import { convertSrtToVtt } from '@/lib/subtitles'
 
 export async function GET(
   request: NextRequest,
@@ -79,6 +80,22 @@ export async function GET(
       txt: 'text/plain; charset=utf-8',
     }
     const contentType = mimeTypes[actualExt || ''] || 'application/octet-stream'
+
+    // Browsers expect WebVTT for <track>. Serve .srt subtitles as converted WebVTT.
+    if (actualExt === 'srt') {
+      const srtContent = await readFile(actualPath, 'utf8')
+      const vttContent = convertSrtToVtt(srtContent)
+      return new NextResponse(vttContent, {
+        status: 200,
+        headers: {
+          'Content-Length': Buffer.byteLength(vttContent, 'utf8').toString(),
+          'Content-Type': 'text/vtt; charset=utf-8',
+          'Cache-Control': 'no-cache',
+          'Content-Disposition': `inline; filename="${actualPath.split('/').pop()?.replace(/\.srt$/i, '.vtt')}"`,
+          'X-Content-Type-Options': 'nosniff',
+        },
+      })
+    }
     
     // Handle range requests (video seeking)
     if (range) {

app/api/lesson/[lessonId]/route.ts

@@ -18,6 +18,9 @@ export async function GET(
         progress: {
           where: { userId: 'local-user' },
         },
+        subtitles: {
+          orderBy: { lang: 'asc' },
+        },
       },
     })
 

app/api/progress/route.ts

@@ -1,5 +1,6 @@
 import { NextRequest, NextResponse } from 'next/server'
 import { prisma } from '@/lib/prisma'
+import { getAnalyticsData } from '@/lib/analytics'
 import { z } from 'zod'
 
 const progressSchema = z.object({
@@ -165,89 +166,7 @@ export async function GET(request: NextRequest) {
     }
 
     if (type === 'analytics') {
-      // Get analytics data for dashboard
-      const allProgress = await prisma.progress.findMany({
-        where: {
-          userId: 'local-user',
-          course: { hidden: false },
-        },
-      })
-
-      const completedLessons = allProgress.filter(p => p.lessonId && p.completed)
-      const inProgressLessons = allProgress.filter(p => p.lessonId && !p.completed && p.position > 0)
-      const notStartedCount = await prisma.lesson.count({
-        where: {
-          module: { course: { hidden: false } },
-          progress: { none: { userId: 'local-user' } },
-        },
-      })
-
-      const totalCourses = await prisma.course.count({ where: { hidden: false } })
-      const completedCourses = await prisma.progress.count({
-        where: {
-          userId: 'local-user',
-          lessonId: null,
-          moduleId: null,
-          completed: true,
-          course: { hidden: false },
-        },
-      })
-      const inProgressCourses = await prisma.progress.count({
-        where: {
-          userId: 'local-user',
-          lessonId: null,
-          moduleId: null,
-          completed: false,
-          course: { hidden: false },
-        },
-      })
-
-      // Calculate total watched time (in seconds)
-      const totalWatchedSeconds = allProgress.reduce((sum, p) => sum + (p.position || 0), 0)
-
-      // Get weekly activity (last 7 days)
-      const sevenDaysAgo = new Date(Date.now() - 7 * 24 * 60 * 60 * 1000)
-      const recentProgress = allProgress.filter(p => new Date(p.lastWatched) >= sevenDaysAgo)
-      const weeklyWatchedSeconds = recentProgress.reduce((sum, p) => sum + (p.position || 0), 0)
-      const weeklyCompleted = recentProgress.filter(p => p.lessonId && p.completed).length
-
-      // Lessons by type
-      const lessonsByType = await prisma.lesson.groupBy({
-        by: ['type'],
-        _count: true,
-        where: { module: { course: { hidden: false } } },
-      })
-
-      // Completed lessons by type
-      const completedByType: Record<string, number> = {}
-      for (const p of completedLessons) {
-        if (!p.lessonId) continue
-        const lesson = await prisma.lesson.findUnique({ where: { id: p.lessonId }, select: { type: true } })
-        if (lesson) {
-          completedByType[lesson.type] = (completedByType[lesson.type] || 0) + 1
-        }
-      }
-
-      return NextResponse.json({
-        totalCourses,
-        completedCourses,
-        inProgressCourses,
-        totalLessons: completedLessons.length + inProgressLessons.length + notStartedCount,
-        completedLessons: completedLessons.length,
-        inProgressLessons: inProgressLessons.length,
-        notStartedLessons: notStartedCount,
-        totalWatchedHours: Math.round(totalWatchedSeconds / 3600 * 10) / 10,
-        totalWatchedMinutes: Math.round(totalWatchedSeconds / 60),
-        weeklyWatchedHours: Math.round(weeklyWatchedSeconds / 3600 * 10) / 10,
-        weeklyWatchedMinutes: Math.round(weeklyWatchedSeconds / 60),
-        weeklyCompletedLessons: weeklyCompleted,
-        lessonsByType,
-        completedByType,
-        completionRate: totalCourses > 0 ? Math.round((completedCourses / totalCourses) * 100) : 0,
-        lessonCompletionRate: (completedLessons.length + inProgressLessons.length + notStartedCount) > 0
-          ? Math.round((completedLessons.length / (completedLessons.length + inProgressLessons.length + notStartedCount)) * 100)
-          : 0,
-      })
+      return NextResponse.json(await getAnalyticsData())
     }
 
     if (lessonId) {

app/layout.tsx

@@ -20,7 +20,7 @@ export const metadata: Metadata = {
   openGraph: {
     type: 'website',
     locale: 'en_US',
-    url: 'http://localhost:6767',
+    url: process.env.NEXT_PUBLIC_APP_URL || 'http://localhost:6969',
     siteName: 'OfflineAcademy',
     title: 'OfflineAcademy — Your Personal Offline Learning Center',
     description: 'A self-hosted, privacy-first learning platform for offline courses.',

app/progress/page.tsx

@@ -103,7 +103,7 @@ const liveGroups: FeatureGroup[] = [
     items: [
       'Bookmarks with timestamp notes',
       'Jump-to-time bookmark playback',
-      'Subtitle support for .srt and .vtt',
+      'Multi-language subtitle tracks for .vtt/.srt files',
       'Inline document viewing for lessons',
     ],
   },

app/scan/page.tsx

@@ -15,6 +15,7 @@ export default function ScanPage() {
   const [result, setResult] = useState<{
     coursesCreated: number
     coursesUpdated: number
+    coursesDeleted: number
     modulesCreated: number
     modulesUpdated: number
     lessonsCreated: number
@@ -53,7 +54,9 @@ export default function ScanPage() {
 
       setResult(data)
       addLog(`Scan completed in ${data.duration}ms`)
-      addLog(`Courses: ${data.coursesCreated} created, ${data.coursesUpdated} updated`)
+      addLog(
+        `Courses: ${data.coursesCreated} created, ${data.coursesUpdated} updated, ${data.coursesDeleted} deleted`
+      )
       addLog(`Modules: ${data.modulesCreated} created, ${data.modulesUpdated} updated`)
       addLog(`Lessons: ${data.lessonsCreated} created, ${data.lessonsUpdated} updated`)
       
@@ -182,7 +185,8 @@ export default function ScanPage() {
 ├── Course Name 1/
 │   ├── 01 - Introduction/
 │   │   ├── 01 - Introduction.mp4
-│   │   ├── 01 - Introduction.srt
+│   │   ├── 01 - Introduction.en.vtt
+│   │   ├── 01 - Introduction.es.vtt
 │   │   ├── 02 - Overview.pdf
 │   │   └── 03 - Notes.txt
 │   ├── 02 - Advanced/
@@ -204,7 +208,8 @@ export default function ScanPage() {
             </pre>
             <div className="mt-3 space-y-2 text-sm text-muted-foreground">
               <p><strong>How the scanner reads it:</strong> course folder → module folder → lesson files.</p>
-              <p><strong>Matching rule:</strong> subtitle files should share the same base name as the video, like <code className="bg-background px-1.5 py-0.5 rounded">lesson.mp4</code> + <code className="bg-background px-1.5 py-0.5 rounded">lesson.srt</code>.</p>
+              <p><strong>Matching rule:</strong> subtitle files can either share the exact video base name, like <code className="bg-background px-1.5 py-0.5 rounded">lesson.mp4</code> + <code className="bg-background px-1.5 py-0.5 rounded">lesson.vtt</code>, or use language suffixes for multiple tracks, like <code className="bg-background px-1.5 py-0.5 rounded">lesson.en.vtt</code> + <code className="bg-background px-1.5 py-0.5 rounded">lesson.es.vtt</code>.</p>
+              <p><strong>Subtitle formats:</strong> <code className="bg-background px-1.5 py-0.5 rounded">.vtt</code> is preferred for browser playback; <code className="bg-background px-1.5 py-0.5 rounded">.srt</code> files are detected and listed as best-effort tracks.</p>
               <p><strong>Sorting:</strong> numeric prefixes like <code className="bg-background px-1.5 py-0.5 rounded">01</code>, <code className="bg-background px-1.5 py-0.5 rounded">02</code>, <code className="bg-background px-1.5 py-0.5 rounded">10</code> keep lessons in learning order.</p>
             </div>
           </CardContent>

app/watch/[lessonId]/WatchPageClient.tsx

@@ -21,6 +21,15 @@ import Link from 'next/link'
 import { formatDuration, formatTime, cn } from '@/lib/utils'
 import { getCourseDisplayName } from '@/lib/course-display'
 
+interface SubtitleTrackType {
+  id?: string
+  src: string
+  lang: string
+  label: string
+  format?: string
+  isDefault: boolean
+}
+
 interface LessonType {
   id: string
   title: string
@@ -33,6 +42,7 @@ interface LessonType {
   filePath: string
   thumbnail: string | null
   subtitlePath: string | null
+  subtitles?: SubtitleTrackType[]
   progress?: { completed: boolean; position: number; lastWatched: string } | null
   quiz?: {
     version: 1
@@ -118,13 +128,28 @@ function markCompleteFn(lessonId: string, courseId: string, moduleId: string, po
 }
 
 function VideoContent({ lesson, lessonProgress, onSave, onEnd, onTimeUpdate, seekRequest }: {
-  lesson: { id: string; filePath: string; thumbnail: string | null; duration: number | null; subtitlePath: string | null }
+  lesson: { id: string; filePath: string; thumbnail: string | null; duration: number | null; subtitlePath: string | null; subtitles?: SubtitleTrackType[] }
   lessonProgress: { completed: boolean; position: number; lastWatched: string }
   onSave: (position: number) => void
   onEnd: () => void
   onTimeUpdate: (time: number) => void
   seekRequest: { time: number; nonce: number } | null
 }) {
+  const subtitleTracks = React.useMemo(() => {
+    if (lesson.subtitles && lesson.subtitles.length > 0) {
+      return lesson.subtitles.map(track => ({
+        src: '/api/files/' + track.src,
+        srcLang: track.lang,
+        label: track.label,
+        default: track.isDefault,
+      }))
+    }
+
+    return lesson.subtitlePath
+      ? [{ src: '/api/files/' + lesson.subtitlePath, srcLang: 'en', label: 'English', default: true }]
+      : []
+  }, [lesson.subtitlePath, lesson.subtitles])
+
   return (
     <VideoPlayer
       src={'/api/files/' + lesson.filePath}
@@ -135,7 +160,7 @@ function VideoContent({ lesson, lessonProgress, onSave, onEnd, onTimeUpdate, see
       onProgressSave={onSave}
       onEnded={onEnd}
       seekRequest={seekRequest}
-      subtitles={lesson.subtitlePath ? '/api/files/' + lesson.subtitlePath : undefined}
+      subtitles={subtitleTracks}
     />
   )
 }

app/watch/[lessonId]/page.tsx

@@ -22,6 +22,12 @@ export default async function WatchPage({ params, searchParams }: WatchPageProps
         progress: {
           where: { userId: 'local-user' },
         },
+        subtitles: {
+          orderBy: [
+            { isDefault: 'desc' },
+            { label: 'asc' },
+          ],
+        },
       },
     })
 

components/VideoPlayer.tsx

@@ -7,10 +7,17 @@ import { cn, formatTime } from '@/lib/utils'
 import { Button } from '@/components/ui/button'
 import { KeyboardShortcutsOverlay } from '@/components/KeyboardShortcutsOverlay'
 
+interface VideoSubtitleTrack {
+  src: string
+  srcLang: string
+  label: string
+  default?: boolean
+}
+
 interface VideoPlayerProps {
   src: string
   poster?: string
-  subtitles?: string
+  subtitles?: VideoSubtitleTrack[]
   onTimeUpdate?: (time: number) => void
   onEnded?: () => void
   onProgressSave?: (time: number) => void
@@ -46,6 +53,10 @@ export function VideoPlayer({
   const [isPiPActive, setIsPiPActive] = useState(false)
   const [hoverProgress, setHoverProgress] = useState<{ time: number; x: number } | null>(null)
   const [showSettingsMenu, setShowSettingsMenu] = useState(false)
+  const [selectedSubtitle, setSelectedSubtitle] = useState<number | 'off'>(() => {
+    const defaultIndex = subtitles?.findIndex(track => track.default) ?? -1
+    return defaultIndex >= 0 ? defaultIndex : 'off'
+  })
   const settingsMenuRef = useRef<HTMLDivElement>(null)
   const controlsTimeoutRef = useRef<ReturnType<typeof setTimeout>>()
   const progressSaveTimeoutRef = useRef<ReturnType<typeof setTimeout>>()
@@ -385,6 +396,32 @@ export function VideoPlayer({
     return () => document.removeEventListener('mousedown', handleClickOutside)
   }, [showSettingsMenu])
 
+  useEffect(() => {
+    const defaultIndex = subtitles?.findIndex(track => track.default) ?? -1
+    setSelectedSubtitle(defaultIndex >= 0 ? defaultIndex : 'off')
+  }, [subtitles])
+
+  useEffect(() => {
+    const textTracks = videoRef.current?.textTracks
+    if (!textTracks) return
+
+    for (let index = 0; index < textTracks.length; index += 1) {
+      textTracks[index].mode = selectedSubtitle === index ? 'showing' : 'disabled'
+    }
+  }, [selectedSubtitle, subtitles])
+
+  const hasSubtitles = Boolean(subtitles && subtitles.length > 0)
+  const captionsEnabled = selectedSubtitle !== 'off'
+  const toggleCaptions = () => {
+    if (!hasSubtitles) return
+    if (captionsEnabled) {
+      setSelectedSubtitle('off')
+      return
+    }
+    const defaultIndex = subtitles?.findIndex(track => track.default) ?? -1
+    setSelectedSubtitle(defaultIndex >= 0 ? defaultIndex : 0)
+  }
+
   return (
     <div
       className="video-player-container"
@@ -410,9 +447,16 @@ export function VideoPlayer({
           onClick={togglePlay}
           className="w-full h-full cursor-pointer"
         >
-          {subtitles && (
-            <track kind="subtitles" src={subtitles} srcLang="en" label="English" default />
-          )}
+          {subtitles?.map((track, index) => (
+            <track
+              key={`${track.srcLang}-${track.src}`}
+              kind="subtitles"
+              src={track.src}
+              srcLang={track.srcLang}
+              label={track.label}
+              default={selectedSubtitle === index}
+            />
+          ))}
         </video>
       </div>
 
@@ -531,6 +575,22 @@ export function VideoPlayer({
               />
             </div>
 
+            {hasSubtitles && (
+              <Button
+                variant="ghost"
+                size="icon"
+                className={cn(
+                  'text-white hover:bg-white/20 font-bold text-xs',
+                  captionsEnabled && 'bg-primary text-primary-foreground hover:bg-primary/90'
+                )}
+                onClick={toggleCaptions}
+                aria-label={captionsEnabled ? 'Turn captions off' : 'Turn captions on'}
+                title={captionsEnabled ? 'Captions on' : 'Captions off'}
+              >
+                CC
+              </Button>
+            )}
+
             {/* Fullscreen - FIRST */}
             <Button
               variant="ghost"
@@ -589,7 +649,7 @@ export function VideoPlayer({
 
               {showSettingsMenu && (
                 <div
-                  className="absolute bottom-full right-0 mb-2 w-40 glass-card-elevated rounded-lg p-2 shadow-xl border border-white/10 animate-in zoom-in-95 z-20"
+                  className="absolute bottom-full right-0 mb-2 w-52 glass-card-elevated rounded-lg p-2 shadow-xl border border-white/10 animate-in zoom-in-95 z-20"
                   role="menu"
                 >
                   <div className="px-3 py-2 text-xs font-semibold text-white/60 uppercase tracking-wider">Speed</div>
@@ -611,6 +671,39 @@ export function VideoPlayer({
                       {playbackRate === rate && <Check className="h-4 w-4" />}
                     </button>
                   ))}
+                  {subtitles && subtitles.length > 0 && (
+                    <>
+                      <hr className="border-white/10 my-1" />
+                      <div className="px-3 py-2 text-xs font-semibold text-white/60 uppercase tracking-wider">Subtitles</div>
+                      <button
+                        onClick={() => {
+                          setSelectedSubtitle('off')
+                          setShowSettingsMenu(false)
+                        }}
+                        className={`w-full flex items-center justify-between px-3 py-2 text-sm text-white hover:bg-white/10 rounded ${selectedSubtitle === 'off' ? 'bg-primary/20 text-primary' : ''}`}
+                        role="menuitemradio"
+                        aria-checked={selectedSubtitle === 'off'}
+                      >
+                        <span>Off</span>
+                        {selectedSubtitle === 'off' && <Check className="h-4 w-4" />}
+                      </button>
+                      {subtitles.map((track, index) => (
+                        <button
+                          key={`${track.srcLang}-${track.src}`}
+                          onClick={() => {
+                            setSelectedSubtitle(index)
+                            setShowSettingsMenu(false)
+                          }}
+                          className={`w-full flex items-center justify-between px-3 py-2 text-sm text-white hover:bg-white/10 rounded ${selectedSubtitle === index ? 'bg-primary/20 text-primary' : ''}`}
+                          role="menuitemradio"
+                          aria-checked={selectedSubtitle === index}
+                        >
+                          <span className="truncate">{track.label}</span>
+                          {selectedSubtitle === index && <Check className="h-4 w-4 shrink-0" />}
+                        </button>
+                      ))}
+                    </>
+                  )}
                   <hr className="border-white/10 my-1" />
                   <button
                     onClick={() => setShowShortcuts(true)}

lib/analytics.ts

@@ -0,0 +1,101 @@
+import { prisma } from '@/lib/prisma'
+
+export interface AnalyticsData {
+  totalCourses: number
+  completedCourses: number
+  inProgressCourses: number
+  totalLessons: number
+  completedLessons: number
+  inProgressLessons: number
+  notStartedLessons: number
+  totalWatchedHours: number
+  totalWatchedMinutes: number
+  weeklyWatchedHours: number
+  weeklyWatchedMinutes: number
+  weeklyCompletedLessons: number
+  lessonsByType: Array<{ type: string; _count: number }>
+  completedByType: Record<string, number>
+  completionRate: number
+  lessonCompletionRate: number
+}
+
+export async function getAnalyticsData(): Promise<AnalyticsData> {
+  const allProgress = await prisma.progress.findMany({
+    where: {
+      userId: 'local-user',
+      course: { hidden: false },
+    },
+  })
+
+  const completedLessons = allProgress.filter(p => p.lessonId && p.completed)
+  const inProgressLessons = allProgress.filter(p => p.lessonId && !p.completed && p.position > 0)
+  const notStartedCount = await prisma.lesson.count({
+    where: {
+      module: { course: { hidden: false } },
+      progress: { none: { userId: 'local-user' } },
+    },
+  })
+
+  const totalCourses = await prisma.course.count({ where: { hidden: false } })
+  const completedCourses = await prisma.progress.count({
+    where: {
+      userId: 'local-user',
+      lessonId: null,
+      moduleId: null,
+      completed: true,
+      course: { hidden: false },
+    },
+  })
+  const inProgressCourses = await prisma.progress.count({
+    where: {
+      userId: 'local-user',
+      lessonId: null,
+      moduleId: null,
+      completed: false,
+      course: { hidden: false },
+    },
+  })
+
+  const totalWatchedSeconds = allProgress.reduce((sum, p) => sum + (p.position || 0), 0)
+
+  const sevenDaysAgo = new Date(Date.now() - 7 * 24 * 60 * 60 * 1000)
+  const recentProgress = allProgress.filter(p => new Date(p.lastWatched) >= sevenDaysAgo)
+  const weeklyWatchedSeconds = recentProgress.reduce((sum, p) => sum + (p.position || 0), 0)
+  const weeklyCompleted = recentProgress.filter(p => p.lessonId && p.completed).length
+
+  const lessonsByType = await prisma.lesson.groupBy({
+    by: ['type'],
+    _count: true,
+    where: { module: { course: { hidden: false } } },
+  })
+
+  const completedByType: Record<string, number> = {}
+  for (const p of completedLessons) {
+    if (!p.lessonId) continue
+    const lesson = await prisma.lesson.findUnique({ where: { id: p.lessonId }, select: { type: true } })
+    if (lesson) {
+      completedByType[lesson.type] = (completedByType[lesson.type] || 0) + 1
+    }
+  }
+
+  const totalLessons = completedLessons.length + inProgressLessons.length + notStartedCount
+
+  return {
+    totalCourses,
+    completedCourses,
+    inProgressCourses,
+    totalLessons,
+    completedLessons: completedLessons.length,
+    inProgressLessons: inProgressLessons.length,
+    notStartedLessons: notStartedCount,
+    totalWatchedHours: Math.round(totalWatchedSeconds / 3600 * 10) / 10,
+    totalWatchedMinutes: Math.round(totalWatchedSeconds / 60),
+    weeklyWatchedHours: Math.round(weeklyWatchedSeconds / 3600 * 10) / 10,
+    weeklyWatchedMinutes: Math.round(weeklyWatchedSeconds / 60),
+    weeklyCompletedLessons: weeklyCompleted,
+    lessonsByType,
+    completedByType,
+    completionRate: totalCourses > 0 ? Math.round((completedCourses / totalCourses) * 100) : 0,
+    lessonCompletionRate: totalLessons > 0 ? Math.round((completedLessons.length / totalLessons) * 100) : 0,
+  }
+}

lib/scanner.ts

@@ -8,6 +8,7 @@ import { getLocalThumbnailUrl } from '@/lib/thumbnail-index-server'
 import { ensureModuleQuizCache, syncQuizLessonFromCache, shouldSkipQuizGeneration } from '@/lib/quiz'
 import { applyCourseMetadata, isMetadataFileName, readCourseMetadataFile } from '@/lib/course-metadata'
 import { getLocalCourseThumbnailPath, ensurePublicThumbnail } from '@/lib/course-thumbnail-utils'
+import { buildSubtitleTrackMap } from '@/lib/subtitles'
 import { writeFile, mkdir } from 'fs/promises'
 import { existsSync } from 'fs'
 
@@ -134,6 +135,7 @@ async function downloadCourseThumbnail(courseName: string, courseSlug: string):
 interface ScanResult {
   coursesCreated: number
   coursesUpdated: number
+  coursesDeleted: number
   modulesCreated: number
   modulesUpdated: number
   lessonsCreated: number
@@ -248,6 +250,7 @@ interface ScanOptions {
 interface ScanResult {
   coursesCreated: number
   coursesUpdated: number
+  coursesDeleted: number
   modulesCreated: number
   modulesUpdated: number
   lessonsCreated: number
@@ -313,6 +316,7 @@ async function scanCourses(options: ScanOptions = {}): Promise<ScanResult> {
   const result: ScanResult = {
     coursesCreated: 0,
     coursesUpdated: 0,
+    coursesDeleted: 0,
     modulesCreated: 0,
     modulesUpdated: 0,
     lessonsCreated: 0,
@@ -445,6 +449,16 @@ async function scanCourses(options: ScanOptions = {}): Promise<ScanResult> {
       }
     }
 
+    const foundSlugs = new Set(courses.map((c) => slugify(c.name)))
+    const staleCourses = existingCourses.filter((c) => !c.hidden && !foundSlugs.has(c.slug))
+    if (staleCourses.length > 0) {
+      const staleIds = staleCourses.map((c) => c.id)
+      await prisma.course.deleteMany({
+        where: { id: { in: staleIds } },
+      })
+      result.coursesDeleted = staleCourses.length
+    }
+
   } catch (error) {
     result.errors.push('Failed to scan courses root: ' + error)
   }
@@ -557,16 +571,31 @@ async function scanLessons(
       .filter(e => e.isFile() && !e.name.startsWith('.'))
       .sort((a, b) => naturalSort(a.name, b.name))
 
-    // Build a map of subtitle files by their base name (for matching with videos)
-    const subtitleMap = new Map<string, string>()
-    for (const file of files) {
-      const ext = extname(file.name).slice(1).toLowerCase()
-      if (['srt', 'vtt'].includes(ext)) {
-        const baseName = basename(file.name, extname(file.name))
-        const relativePath = relative(coursesRoot, join(modulePath, file.name)).replace(/\\/g, '/')
-        subtitleMap.set(baseName, relativePath)
+    const subtitleFiles = files.filter(file => ['srt', 'vtt'].includes(extname(file.name).slice(1).toLowerCase()))
+
+    // Filter files to only include supported lesson types. Subtitle files are attached to videos, not created as lessons.
+    const supportedFiles = files.filter(file => {
+      if (file.name === 'quiz_cache.json' || isMetadataFileName(file.name)) {
+        return false
       }
-    }
+
+      const mimeType = getMimeType(file.name)
+      const lessonType = getLessonType(mimeType)
+      if (lessonType === 'OTHER' && !['json', 'txt'].includes(extname(file.name).slice(1).toLowerCase())) {
+        return false
+      }
+      if (['srt', 'vtt'].includes(extname(file.name).slice(1).toLowerCase())) {
+        return false
+      }
+      return true
+    })
+
+    const selectedFiles = supportedFiles.slice(0, maxLessonsPerCourse)
+    const subtitleMap = buildSubtitleTrackMap(
+      selectedFiles.map(file => file.name),
+      subtitleFiles.map(file => file.name),
+      (fileName) => relative(coursesRoot, join(modulePath, fileName)).replace(/\\/g, '/')
+    )
 
     // Get existing lessons in one query
     const existingLessons = await prisma.lesson.findMany({
@@ -575,90 +604,82 @@ async function scanLessons(
     })
     const existingLessonMap = new Map(existingLessons.map(l => [l.slug, l]))
 
-    // Filter files to only include supported types
-    const supportedFiles = files.filter(file => {
-      if (file.name === 'quiz_cache.json' || isMetadataFileName(file.name)) {
-        return false
-      }
+    const lessonRecords: Array<{ slug: string; baseName: string }> = []
 
+    for (let index = 0; index < selectedFiles.length; index += 1) {
+      const file = selectedFiles[index]
+      const relativePath = relative(coursesRoot, join(modulePath, file.name)).replace(/\\/g, '/')
       const mimeType = getMimeType(file.name)
       const lessonType = getLessonType(mimeType)
-      if (lessonType === 'OTHER' && !['json', 'txt', 'srt', 'vtt'].includes(extname(file.name).slice(1))) {
-        return false
-      }
-      // Skip subtitle files for lesson creation - they'll be attached to videos
-      if (['srt', 'vtt'].includes(extname(file.name).slice(1).toLowerCase())) {
-        return false
-      }
-      return true
-    })
+      const baseName = basename(file.name, extname(file.name))
+      const baseSlug = slugify(baseName)
 
-    // Prepare lesson upserts
-    const lessonUpserts = supportedFiles
-      .slice(0, maxLessonsPerCourse)
-      .map((file, index) => {
-        const relativePath = relative(coursesRoot, join(modulePath, file.name)).replace(/\\/g, '/')
-        const mimeType = getMimeType(file.name)
-        const lessonType = getLessonType(mimeType)
-        const baseName = basename(file.name, extname(file.name))
-        const baseSlug = slugify(baseName)
-
-        let lessonSlug = baseSlug
-        if (moduleSeenSlugs.has(lessonSlug)) {
-          const typedSlug = `${baseSlug}-${lessonType.toLowerCase()}`
-          lessonSlug = typedSlug
-          let suffix = 2
-          while (moduleSeenSlugs.has(lessonSlug)) {
-            lessonSlug = `${typedSlug}-${suffix}`
-            suffix += 1
-          }
+      let lessonSlug = baseSlug
+      if (moduleSeenSlugs.has(lessonSlug)) {
+        const typedSlug = `${baseSlug}-${lessonType.toLowerCase()}`
+        lessonSlug = typedSlug
+        let suffix = 2
+        while (moduleSeenSlugs.has(lessonSlug)) {
+          lessonSlug = `${typedSlug}-${suffix}`
+          suffix += 1
         }
-        moduleSeenSlugs.add(lessonSlug)
+      }
+      moduleSeenSlugs.add(lessonSlug)
 
-        // Check if there's a matching subtitle file
-        const subtitlePath = subtitleMap.get(baseName) || null
+      const subtitleTracks = subtitleMap.get(baseName) || []
+      const defaultSubtitle = subtitleTracks.find(track => track.isDefault) || subtitleTracks[0] || null
 
-        return {
-          where: { moduleId_slug: { moduleId, slug: lessonSlug } },
-          update: {
-            title: baseName,
-            order: index,
-            filePath: relativePath,
-            fileName: file.name,
-            mimeType,
-            type: lessonType,
-            duration: null,
-            thumbnail: null,
-            subtitlePath,
-          },
-          create: {
-            title: baseName,
-            slug: lessonSlug,
-            order: index,
-            filePath: relativePath,
-            fileName: file.name,
-            mimeType,
-            type: lessonType,
-            duration: null,
-            thumbnail: null,
-            subtitlePath,
-            moduleId,
-          },
-        }
+      const lesson = await prisma.lesson.upsert({
+        where: { moduleId_slug: { moduleId, slug: lessonSlug } },
+        update: {
+          title: baseName,
+          order: index,
+          filePath: relativePath,
+          fileName: file.name,
+          mimeType,
+          type: lessonType,
+          duration: null,
+          thumbnail: null,
+          subtitlePath: defaultSubtitle?.src || null,
+        },
+        create: {
+          title: baseName,
+          slug: lessonSlug,
+          order: index,
+          filePath: relativePath,
+          fileName: file.name,
+          mimeType,
+          type: lessonType,
+          duration: null,
+          thumbnail: null,
+          subtitlePath: defaultSubtitle?.src || null,
+          moduleId,
+        },
       })
 
-    if (lessonUpserts.length > 0) {
-      await prisma.$transaction(
-        lessonUpserts.map(upsert => prisma.lesson.upsert(upsert))
-      )
+      await prisma.$transaction([
+        prisma.subtitleTrack.deleteMany({ where: { lessonId: lesson.id } }),
+        ...subtitleTracks.map(track => prisma.subtitleTrack.create({
+          data: {
+            lessonId: lesson.id,
+            src: track.src,
+            lang: track.lang,
+            label: track.label,
+            format: track.format,
+            isDefault: track.src === defaultSubtitle?.src,
+          },
+        })),
+      ])
+
+      lessonRecords.push({ slug: lessonSlug, baseName })
     }
 
     const moduleShouldSkipQuiz = await shouldSkipQuizGeneration(modulePath, basename(modulePath))
 
     // Update counts for non-quiz lessons first
-    const newLessons = lessonUpserts.filter(u => !existingLessonMap.has(u.where.moduleId_slug.slug))
+    const newLessons = lessonRecords.filter(record => !existingLessonMap.has(record.slug))
     result.lessonsCreated += newLessons.length
-    result.lessonsUpdated += lessonUpserts.length - newLessons.length
+    result.lessonsUpdated += lessonRecords.length - newLessons.length
 
     if (!moduleShouldSkipQuiz) {
       if (autoFetchQuizzes) {
@@ -677,7 +698,7 @@ async function scanLessons(
         courseRoot: coursesRoot,
         topic: basename(modulePath),
         source: quizApiSource,
-        lessonOrder: lessonUpserts.length,
+        lessonOrder: lessonRecords.length,
         autoFetch: autoFetchQuizzes,
       })
 

lib/subtitles.ts

@@ -0,0 +1,227 @@
+import { basename, extname } from 'path'
+
+export type SubtitleFormat = 'vtt' | 'srt'
+
+export type SubtitleTrackInput = {
+  src: string
+  lang: string
+  label: string
+  format: SubtitleFormat
+  isDefault: boolean
+}
+
+const LANGUAGE_LABELS: Record<string, string> = {
+  en: 'English',
+  es: 'Spanish',
+  fr: 'French',
+  de: 'German',
+  it: 'Italian',
+  pt: 'Portuguese',
+  'pt-BR': 'Portuguese (Brazil)',
+  zh: 'Chinese',
+  'zh-CN': 'Chinese (Simplified)',
+  'zh-TW': 'Chinese (Traditional)',
+  ja: 'Japanese',
+  ko: 'Korean',
+  fil: 'Filipino',
+  tl: 'Tagalog',
+  id: 'Indonesian',
+  ms: 'Malay',
+  th: 'Thai',
+  vi: 'Vietnamese',
+  ar: 'Arabic',
+  hi: 'Hindi',
+  ru: 'Russian',
+}
+
+export function normalizeSubtitleLang(code: string): string {
+  const trimmed = code.trim().replace(/_/g, '-')
+  if (!trimmed) return 'en'
+
+  const [language, region, ...rest] = trimmed.split('-')
+  const normalizedLanguage = language.toLowerCase()
+  const normalizedRegion = region ? region.toUpperCase() : undefined
+  const normalizedRest = rest.map(part => part.length === 2 ? part.toUpperCase() : part)
+
+  return [normalizedLanguage, normalizedRegion, ...normalizedRest]
+    .filter(Boolean)
+    .join('-')
+}
+
+export function languageCodeToLabel(code: string): string {
+  const normalized = normalizeSubtitleLang(code)
+  if (LANGUAGE_LABELS[normalized]) return LANGUAGE_LABELS[normalized]
+
+  const baseLanguage = normalized.split('-')[0]
+  if (LANGUAGE_LABELS[baseLanguage]) {
+    const region = normalized.split('-')[1]
+    return region ? `${LANGUAGE_LABELS[baseLanguage]} (${region})` : LANGUAGE_LABELS[baseLanguage]
+  }
+
+  return normalized
+    .split('-')
+    .map(part => part.charAt(0).toUpperCase() + part.slice(1))
+    .join(' ')
+}
+
+export function getSubtitleFormat(fileName: string): SubtitleFormat | null {
+  const ext = extname(fileName).slice(1).toLowerCase()
+  return ext === 'vtt' || ext === 'srt' ? ext : null
+}
+
+function tryExactBasename(
+  videoBaseName: string,
+  subtitleBaseName: string,
+  src: string,
+  format: SubtitleFormat
+): SubtitleTrackInput | null {
+  if (subtitleBaseName === videoBaseName) {
+    return {
+      src,
+      lang: 'en',
+      label: 'English',
+      format,
+      isDefault: true,
+    }
+  }
+  return null
+}
+
+function tryDottedLangSuffix(
+  videoBaseName: string,
+  subtitleBaseName: string,
+  src: string,
+  format: SubtitleFormat
+): SubtitleTrackInput | null {
+  const languagePrefix = `${videoBaseName}.`
+  if (!subtitleBaseName.startsWith(languagePrefix)) return null
+
+  const rawLanguage = subtitleBaseName.slice(languagePrefix.length)
+  if (!rawLanguage || rawLanguage.includes('/')) return null
+
+  const lang = normalizeSubtitleLang(rawLanguage)
+  return {
+    src,
+    lang,
+    label: languageCodeToLabel(lang),
+    format,
+    isDefault: lang === 'en',
+  }
+}
+
+function tryEmbeddedLangSegment(
+  videoBaseName: string,
+  subtitleBaseName: string,
+  src: string,
+  format: SubtitleFormat
+): SubtitleTrackInput | null {
+  const subtitleParts = subtitleBaseName.split('-')
+  const videoParts = videoBaseName.split('-')
+  if (subtitleParts.length < videoParts.length + 1) return null
+
+  for (let index = 1; index < subtitleParts.length - 1; index += 1) {
+    const candidateParts = [...subtitleParts]
+    candidateParts.splice(index, 1)
+    if (candidateParts.join('-') !== videoBaseName) continue
+
+    const rawLanguage = subtitleParts[index]
+    if (!rawLanguage || rawLanguage.includes('/')) continue
+
+    const lang = normalizeSubtitleLang(rawLanguage)
+    return {
+      src,
+      lang,
+      label: languageCodeToLabel(lang),
+      format,
+      isDefault: lang === 'en',
+    }
+  }
+
+  return null
+}
+
+export function parseSubtitleForVideo(
+  videoBaseName: string,
+  subtitleFileName: string,
+  src: string
+): SubtitleTrackInput | null {
+  const format = getSubtitleFormat(subtitleFileName)
+  if (!format) return null
+
+  const subtitleBaseName = basename(subtitleFileName, extname(subtitleFileName))
+
+  const direct = tryExactBasename(videoBaseName, subtitleBaseName, src, format)
+  if (direct) return direct
+
+  const dotted = tryDottedLangSuffix(videoBaseName, subtitleBaseName, src, format)
+  if (dotted) return dotted
+
+  const embedded = tryEmbeddedLangSegment(videoBaseName, subtitleBaseName, src, format)
+  if (embedded) return embedded
+
+  return null
+}
+
+export function buildSubtitleTrackMap(
+  videoFileNames: string[],
+  subtitleFileNames: string[],
+  toRelativePath: (fileName: string) => string
+): Map<string, SubtitleTrackInput[]> {
+  const map = new Map<string, SubtitleTrackInput[]>()
+  const videoBaseNames = videoFileNames.map(fileName => basename(fileName, extname(fileName)))
+
+  for (const videoBaseName of videoBaseNames) {
+    for (const subtitleFileName of subtitleFileNames) {
+      const track = parseSubtitleForVideo(
+        videoBaseName,
+        subtitleFileName,
+        toRelativePath(subtitleFileName)
+      )
+      if (!track) continue
+
+      const existingTracks = map.get(videoBaseName) || []
+      const duplicate = existingTracks.some(existing => existing.lang === track.lang && existing.src === track.src)
+      if (!duplicate) {
+        existingTracks.push(track)
+      }
+      map.set(videoBaseName, sortSubtitleTracks(existingTracks))
+    }
+  }
+
+  return map
+}
+
+export function sortSubtitleTracks(tracks: SubtitleTrackInput[]): SubtitleTrackInput[] {
+  return [...tracks].sort((a, b) => {
+    if (a.isDefault !== b.isDefault) return a.isDefault ? -1 : 1
+    if (a.lang === 'en' && b.lang !== 'en') return -1
+    if (b.lang === 'en' && a.lang !== 'en') return 1
+    return a.label.localeCompare(b.label)
+  })
+}
+
+export function convertSrtToVtt(content: string): string {
+  const normalized = content
+    .replace(/^\uFEFF/, '')
+    .replace(/\r\n/g, '\n')
+    .replace(/\r/g, '\n')
+    .trim()
+
+  if (!normalized) return 'WEBVTT\n\n'
+  if (normalized.startsWith('WEBVTT')) return normalized.endsWith('\n') ? normalized : `${normalized}\n`
+
+  const vttBody = normalized
+    .split('\n')
+    .map(line => {
+      if (/^\d+$/.test(line.trim())) return ''
+      return line.replace(
+        /(\d{2}:\d{2}:\d{2}),(\d{3})\s+-->\s+(\d{2}:\d{2}:\d{2}),(\d{3})/g,
+        '$1.$2 --> $3.$4'
+      )
+    })
+    .join('\n')
+    .replace(/\n{3,}/g, '\n\n')
+    .trim()
+
+  return `WEBVTT\n\n${vttBody}\n`
+}

package-lock.json

@@ -29,6 +29,7 @@
         "next-themes": "^0.3.0",
         "react": "^18.3.0",
         "react-dom": "^18.3.0",
+        "server-only": "^0.0.1",
         "sharp": "^0.35.1",
         "tailwind-merge": "^2.2.0",
         "tailwindcss-animate": "^1.0.7",
@@ -6317,6 +6318,12 @@
         "node": ">=10"
       }
     },
+    "node_modules/server-only": {
+      "version": "0.0.1",
+      "resolved": "https://registry.npmjs.org/server-only/-/server-only-0.0.1.tgz",
+      "integrity": "sha512-qepMx2JxAa5jjfzxG79yPPq+8BuFToHd1hm7kI+Z4zAq1ftQiP7HcxMhDDItrbtwVeLg/cY2JnKnrcFkmiswNA==",
+      "license": "MIT"
+    },
     "node_modules/set-function-length": {
       "version": "1.2.2",
       "dev": true,

package.json

@@ -33,6 +33,7 @@
     "next-themes": "^0.3.0",
     "react": "^18.3.0",
     "react-dom": "^18.3.0",
+    "server-only": "^0.0.1",
     "sharp": "^0.35.1",
     "tailwind-merge": "^2.2.0",
     "tailwindcss-animate": "^1.0.7",

prisma/schema.prisma

@@ -71,6 +71,7 @@ model Lesson {
 
   progress    Progress[]
   bookmarks   Bookmark[]
+  subtitles    SubtitleTrack[]
   quiz         Quiz?
   quizAttempts  QuizAttempt[]
 
@@ -79,6 +80,22 @@ model Lesson {
   @@index([filePath])
 }
 
+model SubtitleTrack {
+  id        String   @id @default(cuid())
+  lessonId  String
+  lesson    Lesson   @relation(fields: [lessonId], references: [id], onDelete: Cascade)
+  src       String
+  lang      String
+  label     String
+  format    String
+  isDefault Boolean  @default(false)
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+
+  @@unique([lessonId, lang, src])
+  @@index([lessonId])
+}
+
 model Progress {
   id          String   @id @default(cuid())
   userId      String   @default("local-user")

public/sw.js

@@ -1,7 +1,7 @@
-// OfflineAcademy Service Worker v3 — Minimal, Chrome-install-criteria focused
+// OfflineAcademy Service Worker v4 — Offline support without stale Next.js dev chunks
 // Logs to console so you can verify it's controlling the page
 
-const CACHE = "oa-v5"
+const CACHE = "oa-v6"
 const ASSETS = [
   '/',
   '/site.webmanifest',
@@ -29,6 +29,22 @@ self.addEventListener('fetch', e => {
   const url = new URL(e.request.url)
   console.log('[SW] Fetch:', url.pathname)
 
+  // Never cache Next.js runtime/dev chunks or HMR/RSC payloads. Stale chunks can keep old runtime errors alive.
+  if (
+    url.pathname.startsWith('/_next/') ||
+    url.pathname === '/__nextjs_original-stack-frame' ||
+    url.pathname === '/__nextjs_launch-editor'
+  ) {
+    e.respondWith(fetch(e.request))
+    return
+  }
+
+  // Keep analytics fully live while debugging/runtime data is dynamic.
+  if (url.pathname === '/analytics') {
+    e.respondWith(fetch(e.request))
+    return
+  }
+
   // Navigation (main page) — network first, cache fallback
   if (e.request.mode === 'navigate') {
     e.respondWith(networkFirst(e.request))
@@ -86,4 +102,4 @@ self.addEventListener('message', e => {
   }
 })
 
-console.log('[SW] Loaded - version 3')
+console.log('[SW] Loaded - version 4')

scripts/verify-stale-scan.ts

@@ -0,0 +1,47 @@
+import { mkdir, rm, writeFile } from 'fs/promises'
+import { join } from 'path'
+import { prisma } from '@/lib/prisma'
+import { scanCoursesDirectory } from '@/lib/scanner'
+
+function assert(condition: unknown, message: string) {
+  if (!condition) throw new Error(message)
+}
+
+async function main() {
+  const root = '/tmp/offlineacademy-stale-scan'
+  const coursesRoot = join(root, 'My_Courses')
+  const coursePath = join(coursesRoot, 'Stale Course', '01 - Module')
+
+  await rm(root, { recursive: true, force: true })
+  await mkdir(coursePath, { recursive: true })
+  await writeFile(join(coursePath, '01 - Lesson.mp4'), '')
+
+  await prisma.setting.upsert({
+    where: { key: 'coursesRoot' },
+    update: { value: coursesRoot },
+    create: { key: 'coursesRoot', value: coursesRoot },
+  })
+
+  await scanCoursesDirectory({ maxConcurrency: 1, maxLessonsPerCourse: 10, maxModulesPerCourse: 5 })
+
+  const before = await prisma.course.count()
+  assert(before === 1, `expected 1 course before delete, got ${before}`)
+
+  await rm(join(coursesRoot, 'Stale Course'), { recursive: true, force: true })
+
+  await scanCoursesDirectory({ maxConcurrency: 1, maxLessonsPerCourse: 10, maxModulesPerCourse: 5 })
+
+  const after = await prisma.course.count()
+  assert(after === 0, `expected 0 courses after delete, got ${after}`)
+
+  console.log('stale course deletion verification passed')
+}
+
+main()
+  .catch((error) => {
+    console.error(error)
+    process.exitCode = 1
+  })
+  .finally(async () => {
+    await prisma.$disconnect()
+  })

scripts/verify-subtitle-parser.ts

@@ -0,0 +1,42 @@
+import { buildSubtitleTrackMap, convertSrtToVtt, languageCodeToLabel, normalizeSubtitleLang } from '@/lib/subtitles'
+
+function assert(condition: unknown, message: string) {
+  if (!condition) {
+    throw new Error(message)
+  }
+}
+
+const tracks = buildSubtitleTrackMap(
+  ['01 - Lesson.mp4', '02 - Other.mp4'],
+  [
+    '01 - Lesson.vtt',
+    '01 - Lesson.en.vtt',
+    '01 - Lesson.es.vtt',
+    '01 - Lesson.pt-BR.srt',
+    '02 - Other.ja.vtt',
+    'unrelated.en.vtt',
+  ],
+  (fileName) => `Course/Module/${fileName}`
+)
+
+const lessonTracks = tracks.get('01 - Lesson') || []
+assert(lessonTracks.length === 4, `expected 4 subtitle tracks for 01 - Lesson, got ${lessonTracks.length}`)
+assert(lessonTracks[0].lang === 'en', 'legacy subtitle should become default English track')
+assert(lessonTracks[0].isDefault === true, 'first/default English track should be default')
+assert(lessonTracks.some(track => track.lang === 'es' && track.label === 'Spanish'), 'Spanish track missing')
+assert(lessonTracks.some(track => track.lang === 'pt-BR' && track.label === 'Portuguese (Brazil)'), 'pt-BR track missing')
+
+const otherTracks = tracks.get('02 - Other') || []
+assert(otherTracks.length === 1, `expected 1 subtitle track for 02 - Other, got ${otherTracks.length}`)
+assert(otherTracks[0].lang === 'ja' && otherTracks[0].label === 'Japanese', 'Japanese track missing')
+
+assert(normalizeSubtitleLang('PT-br') === 'pt-BR', 'pt-BR normalization failed')
+assert(languageCodeToLabel('fil') === 'Filipino', 'Filipino label failed')
+assert(!tracks.has('unrelated'), 'unrelated subtitle should not create a track group')
+
+const converted = convertSrtToVtt('1\n00:00:01,250 --> 00:00:04,500\nHello captions\n')
+assert(converted.startsWith('WEBVTT'), 'SRT conversion should emit WEBVTT header')
+assert(converted.includes('00:00:01.250 --> 00:00:04.500'), 'SRT conversion should rewrite comma timestamps')
+assert(!converted.includes('00:00:01,250'), 'SRT conversion should not keep comma timestamps')
+
+console.log('subtitle parser verification passed')

scripts/verify-subtitle-scan.ts

@@ -0,0 +1,59 @@
+import { mkdir, rm, writeFile } from 'fs/promises'
+import { join } from 'path'
+import { prisma } from '@/lib/prisma'
+import { scanCoursesDirectory } from '@/lib/scanner'
+
+function assert(condition: unknown, message: string) {
+  if (!condition) {
+    throw new Error(message)
+  }
+}
+
+async function main() {
+  const root = '/tmp/offlineacademy-subtitle-scan-smoke'
+  const coursesRoot = join(root, 'My_Courses')
+  const modulePath = join(coursesRoot, 'Subtitle Smoke Course', '01 - Module')
+
+  await rm(root, { recursive: true, force: true })
+  await mkdir(modulePath, { recursive: true })
+
+  await writeFile(join(modulePath, '01 - Lesson.mp4'), '')
+  await writeFile(join(modulePath, '01 - Lesson.vtt'), 'WEBVTT\n\n00:00:00.000 --> 00:00:01.000\nLegacy English\n')
+  await writeFile(join(modulePath, '01 - Lesson.en.vtt'), 'WEBVTT\n\n00:00:00.000 --> 00:00:01.000\nEnglish\n')
+  await writeFile(join(modulePath, '01 - Lesson.es.vtt'), 'WEBVTT\n\n00:00:00.000 --> 00:00:01.000\nEspañol\n')
+  await writeFile(join(modulePath, '01 - Lesson.ja.vtt'), 'WEBVTT\n\n00:00:00.000 --> 00:00:01.000\n日本語\n')
+  await writeFile(join(modulePath, '01 - Lesson.pt-BR.srt'), '1\n00:00:00,000 --> 00:00:01,000\nPortuguês\n')
+
+  await prisma.setting.upsert({
+    where: { key: 'coursesRoot' },
+    update: { value: coursesRoot },
+    create: { key: 'coursesRoot', value: coursesRoot },
+  })
+
+  const result = await scanCoursesDirectory({ maxConcurrency: 1, maxLessonsPerCourse: 10, maxModulesPerCourse: 5 })
+  assert(result.errors.length === 0, `expected no scan errors, got ${JSON.stringify(result.errors)}`)
+
+  const lesson = await prisma.lesson.findFirst({
+    where: { fileName: '01 - Lesson.mp4' },
+    include: { subtitles: { orderBy: [{ isDefault: 'desc' }, { label: 'asc' }] } },
+  })
+
+  assert(lesson, 'expected scanned lesson to exist')
+  assert(lesson?.subtitlePath, 'expected legacy subtitlePath fallback to be set')
+  assert(lesson?.subtitles.length === 5, `expected 5 subtitle tracks, got ${lesson?.subtitles.length}`)
+  assert(lesson?.subtitles.some(track => track.lang === 'es' && track.label === 'Spanish'), 'expected Spanish subtitle track')
+  assert(lesson?.subtitles.some(track => track.lang === 'ja' && track.label === 'Japanese'), 'expected Japanese subtitle track')
+  assert(lesson?.subtitles.some(track => track.lang === 'pt-BR' && track.label === 'Portuguese (Brazil)' && track.format === 'srt'), 'expected pt-BR SRT subtitle track')
+  assert(lesson?.subtitles.filter(track => track.isDefault).length === 1, 'expected exactly one default subtitle track')
+
+  console.log('subtitle scan verification passed')
+}
+
+main()
+  .catch(error => {
+    console.error(error)
+    process.exitCode = 1
+  })
+  .finally(async () => {
+    await prisma.$disconnect()
+  })