# � Trilium Web Clipper MV3 - Working Status

**Extension Status:** ✅ CORE FUNCTIONALITY WORKING  
**Last Updated:** October 17, 2025  
**Build System:** esbuild + IIFE  
**Target:** Manifest V3 (Chrome/Edge/Brave)

---

## 🚀 Quick Start

```bash
# Make sure you are in the correct working directory
cd apps/web-clipper-manifestv3

# Build
npm run build

# Load in Chrome
chrome://extensions/ → Load unpacked → Select dist/
```

---

## ✅ Implemented & Working

### Core Functionality
- ✅ **Content script injection** (declarative)
- ✅ **Save Selection** to Trilium
- ✅ **Save Page** to Trilium (with Readability + DOMPurify + Cheerio pipeline)
- ✅ **Save Link** (basic - URL + title only)
- ✅ **Save Screenshot** (full page capture, metadata stored)
- ✅ **Duplicate note detection** with user choice (new/update/cancel)
- ✅ **HTML/Markdown/Both** save formats
- ✅ **Context menus** (Save Selection, Save Page, Save Link, Save Screenshot, Save Image)
- ✅ **Keyboard shortcuts** (Ctrl+Shift+S for save, Ctrl+Shift+A for screenshot)

### UI Components
- ✅ **Popup UI** with theming (light/dark/auto)
- ✅ **Settings page** with Trilium connection config
- ✅ **Logs page** with filtering
- ✅ **Toast notifications** (basic success/error)
- ✅ **Connection status** indicator
- ✅ **System theme detection**

### Build System
- ✅ **esbuild** bundling (IIFE format)
- ✅ **TypeScript** compilation
- ✅ **HTML transformation** (script refs fixed)
- ✅ **Asset copying** (CSS, icons, manifest)
- ✅ **Type checking** (`npm run type-check`)

---

## 🔴 Missing Features (vs MV2)

### High Priority

#### 1. **Screenshot Cropping** 🎯 NEXT UP
- **MV2:** `cropImage()` function crops screenshot to selected area
- **MV3:** Crop rectangle stored in metadata but NOT applied to image
- **Impact:** Users get full-page screenshot instead of selected area
- **Solution:** Use OffscreenCanvas API or content script canvas
- **Files:** `src/background/index.ts:504-560`, need crop implementation

#### 2. **Image Processing (Full Page)**
- **MV2:** Downloads all external images, converts to base64, embeds in note
- **MV3:** Only processes images for **selection saves**, not full page
- **Impact:** External images in full-page clips may break/disappear
- **Solution:** Apply `postProcessImages()` to all capture types
- **Files:** `src/background/index.ts:668-740`

#### 3. **Screenshot Selection UI Verification**
- **MV2:** Overlay with drag-to-select, Escape to cancel, visual feedback
- **MV3:** Likely exists in content script but needs testing against MV2
- **Impact:** Unknown - need to verify feature parity
- **Files:** Check `src/content/` against `apps/web-clipper/content.js:66-193`

### Medium Priority

#### 4. **Save Tabs (Bulk Save)**
- **MV2:** "Save tabs" context menu saves all open tabs as single note with links
- **MV3:** Not implemented
- **Impact:** Users can't bulk-save research sessions
- **Solution:** Add context menu + background handler
- **Files:** Reference `apps/web-clipper/background.js:302-326`

#### 5. **"Already Visited" Popup Detection**
- **MV2:** Popup shows if page already clipped, with link to existing note
- **MV3:** Background has `checkForExistingNote()` but popup doesn't use it
- **Impact:** Users don't know if they've already saved a page
- **Solution:** Call `checkForExistingNote()` on popup open, show banner
- **Files:** `src/popup/`, reference `apps/web-clipper/popup/popup.js`

### Low Priority (Quality of Life)

#### 6. **Link with Custom Note**
- **MV2:** Save link with custom text entry (textarea in popup)
- **MV3:** Only saves URL + page title
- **Impact:** Can't add context/thoughts when saving links
- **Solution:** Add textarea to popup for "Save Link" action
- **Files:** `src/popup/index.ts`, `src/background/index.ts:562-592`

#### 7. **Date Metadata Extraction**
- **MV2:** Extracts `publishedDate`/`modifiedDate` from meta tags
- **MV3:** Not implemented
- **Impact:** Lost temporal metadata for articles
- **Solution:** Add meta tag parsing to content script
- **Files:** Add to content script, reference `apps/web-clipper/content.js:44-65`

#### 8. **Interactive Toast Notifications**
- **MV2:** Toasts have "Open in Trilium" and "Close Tabs" buttons
- **MV3:** Basic toasts with text only
- **Impact:** Extra step to open saved notes
- **Solution:** Add button elements to toast HTML
- **Files:** `src/content/toast.ts`, reference `apps/web-clipper/content.js:253-291`

---

## ⚠️ Partially Implemented

| Feature | Status | Gap |
|---------|--------|-----|
| Screenshot capture | ✅ Working | No cropping applied |
| Image processing | ⚠️ Selection only | Full page clips missing |
| Save link | ✅ Basic | No custom note text |
| Toast notifications | ✅ Basic | No interactive buttons |
| Duplicate detection | ✅ Working | Not shown in popup proactively |

---

## 📋 Feature Comparison Matrix

| Feature | MV2 | MV3 | Priority |
|---------|-----|-----|----------|
| **Content Capture** ||||
| Save Selection | ✅ | ✅ | - |
| Save Full Page | ✅ | ✅ | - |
| Save Link | ✅ | ⚠️ Basic | LOW |
| Save Screenshot | ✅ | ⚠️ No crop | **HIGH** |
| Save Image | ✅ | ✅ | - |
| Save Tabs | ✅ | ❌ | MED |
| **Content Processing** ||||
| Readability extraction | ✅ | ✅ | - |
| DOMPurify sanitization | ✅ | ✅ | - |
| Cheerio cleanup | ✅ | ✅ | - |
| Image downloading | ✅ | ⚠️ Partial | **HIGH** |
| Date metadata | ✅ | ❌ | LOW |
| Screenshot cropping | ✅ | ❌ | **HIGH** |
| **Save Formats** ||||
| HTML | ✅ | ✅ | - |
| Markdown | ✅ | ✅ | - |
| Both (parent/child) | ✅ | ✅ | - |
| **UI Features** ||||
| Popup | ✅ | ✅ | - |
| Settings page | ✅ | ✅ | - |
| Logs page | ✅ | ✅ | - |
| Context menus | ✅ | ✅ | - |
| Keyboard shortcuts | ✅ | ✅ | - |
| Toast notifications | ✅ | ⚠️ Basic | LOW |
| Already visited banner | ✅ | ❌ | MED |
| Screenshot selection UI | ✅ | ❓ Unknown | **HIGH** |
| **Connection** ||||
| HTTP/HTTPS servers | ✅ | ✅ | - |
| Desktop app mode | ✅ | ✅ | - |
| Connection testing | ✅ | ✅ | - |
| Auto-reconnect | ✅ | ✅ | - |

---

## 🎯 Current Development Phase

### Phase 1: Critical Features ✅ COMPLETE
- ✅ Build system working
- ✅ Content script injection
- ✅ Basic save functionality
- ✅ Settings & logs UI

### Phase 2: Screenshot Features 🔄 IN PROGRESS
- ⏳ **Task 2.1:** Verify screenshot selection UI
- ⏳ **Task 2.2:** Implement screenshot cropping
- ⏳ **Task 2.3:** Test crop workflow end-to-end

### Phase 3: Image Processing (Planned)
- ⏸️ Apply image processing to full page captures
- ⏸️ Test with various image formats
- ⏸️ Handle CORS edge cases

### Phase 4: Quality of Life (Planned)
- ⏸️ Save tabs feature
- ⏸️ Already visited detection
- ⏸️ Link with custom note
- ⏸️ Date metadata extraction
- ⏸️ Interactive toasts

---

## 🛠️ Build System

**Source:** `src/` (TypeScript)  
**Output:** `dist/` (IIFE JavaScript)  
**Config:** `build.mjs`

### Key Transformations
- `.ts` → `.js` (IIFE bundled)
- HTML script refs fixed (`.ts` → `.js`)
- Paths rewritten for flat structure
- CSS + icons copied
- manifest.json validated

### Common Commands
```bash
# Build for production
npm run build

# Type checking
npm run type-check

# Clean build
npm run clean && npm run build
```

---

## 📂 File Structure

```
dist/
├── background.js         # Service worker (IIFE)
├── content.js           # Content script (IIFE)
├── popup.js             # Popup UI logic (IIFE)
├── options.js           # Settings page (IIFE)
├── logs.js              # Logs page (IIFE)
├── *.html               # HTML files (script refs fixed)
├── *.css                # Styles (includes theme.css)
├── icons/               # Extension icons
├── shared/              # Shared assets (theme.css)
└── manifest.json        # Chrome extension manifest
```

---

## 🧪 Testing Checklist

### Before Each Build
- [ ] `npm run type-check` passes
- [ ] `npm run build` completes without errors
- [ ] No console errors in background service worker
- [ ] No console errors in content script

### Core Functionality
- [ ] Popup displays correctly
- [ ] Settings page accessible
- [ ] Logs page accessible
- [ ] Connection status shows correctly
- [ ] Theme switching works (light/dark/auto)

### Save Operations
- [ ] Save Selection works
- [ ] Save Page works
- [ ] Save Link works
- [ ] Save Screenshot works (full page)
- [ ] Save Image works
- [ ] Context menu items appear
- [ ] Keyboard shortcuts work

### Error Handling
- [ ] Invalid Trilium URL shows error
- [ ] Network errors handled gracefully
- [ ] Restricted URLs (chrome://) blocked properly
- [ ] Duplicate note dialog works

---

## 🎯 Next Steps

### Immediate (This Session)
1. **Verify screenshot selection UI** exists and works
2. **Implement screenshot cropping** using OffscreenCanvas
3. **Test end-to-end** screenshot workflow

### Short Term (Next Session)
4. Fix image processing for full page captures
5. Add "already visited" detection to popup
6. Implement "save tabs" feature

### Long Term
7. Add custom note text for links
8. Extract date metadata
9. Add interactive toast buttons
10. Performance optimization
11. Cross-browser testing (Firefox, Edge)

---

## 📚 Documentation

- `BUILD-MIGRATION-SUMMARY.md` - Build system details
- `reference/dev_notes/TOAST-NOTIFICATION-IMPLEMENTATION.md` - Toast system
- `reference/chrome_extension_docs/` - Chrome API docs
- `reference/Mozilla_Readability_docs/` - Readability docs
- `reference/cure53_DOMPurify_docs/` - DOMPurify docs
- `reference/cheerio_docs/` - Cheerio docs

---

## 🐛 Known Issues

1. **Screenshot cropping not applied** - Crop rect stored but image not cropped
2. **Images not embedded in full page** - Only works for selections
3. **No "already visited" indicator** - Backend exists, UI doesn't use it
4. **Screenshot selection UI untested** - Need to verify against MV2

---

## 💡 Support

**Issue:** Extension not loading?  
**Fix:** Check `chrome://extensions/` errors, rebuild with `npm run build`

**Issue:** Buttons not working?  
**Fix:** Open DevTools, check console for errors, verify script paths in HTML

**Issue:** Missing styles?  
**Fix:** Check `dist/shared/theme.css` exists after build

**Issue:** Content script not injecting?  
**Fix:** Check URL isn't restricted (chrome://, about:, file://)

**Issue:** Can't connect to Trilium?  
**Fix:** Verify URL in settings, check CORS headers, test with curl

---

## 🎨 Architecture Notes

### Content Processing Pipeline
```
Raw HTML
  ↓
Phase 1: Readability (article extraction)
  ↓
Phase 2: DOMPurify (security sanitization)
  ↓
Phase 3: Cheerio (final polish)
  ↓
Clean HTML → Trilium
```

### Save Format Options
- **HTML:** Human-readable, rich formatting (default)
- **Markdown:** AI/LLM-friendly, plain text with structure
- **Both:** HTML parent note + Markdown child note

### Message Flow
```
Content Script → Background → Trilium Server
     ↑              ↓
   Toast      Storage/State
```

---

## 🔒 Security

- ✅ DOMPurify sanitization on all HTML
- ✅ CSP compliant (no inline scripts/eval)
- ✅ Restricted URL blocking
- ✅ HTTPS recommended for Trilium connection
- ⚠️ Auth token stored in chrome.storage.local (encrypted by browser)

---

**Status:** 🟢 Ready for Phase 2 Development  
**Next Task:** Screenshot Selection UI Verification & Cropping Implementation

Ready to build! 🚀