# LexAI Phase 1 — Build Summary

**Built by:** Forge 🔨  
**Date:** 2026-03-06  
**Deadline:** 3PM PH time  
**Status:** ✅ All 7 workitems completed and pushed

---

## What Was Built

### 1. WXT Project Setup (Issue #1) ✅
- **Problem:** `@wxt-dev/module-react` was missing; `wxt/sandbox` import path was invalid in WXT 0.20.x
- **Fix:** Installed `@wxt-dev/module-react`; updated imports to `wxt/utils/define-background` and `wxt/utils/define-content-script`
- **Result:** `npm run build` completes cleanly in ~3s, output size ~166KB

### 2. Text Selection Detection (Issue #2) ✅
- Handles **three element types**:
  - `<textarea>` and `<input>` — uses `selectionStart`/`selectionEnd` on the element
  - `contenteditable` and regular DOM — uses the Selection/Range API
- Captures and stores the active element + selection offsets at selection time, so replacement works even after the floating toolbar takes focus
- 50ms debounce on `mouseup` to let the browser finalize selection

### 3. Floating Toolbar UI (Issue #3) ✅
- Polished dark toolbar with 4 actions: **✓ Fix**, **↺ Rephrase**, **↓ Shorten**, **↑ Expand**
- Smart positioning: appears above the cursor, clamps to viewport edges, flips below if too close to top
- Uses `data-lexai="true"` attribute on all LexAI elements to prevent self-triggering
- Hover effects, smooth transitions, colored labels per action
- `mousedown` preventDefault preserves the selection while clicking toolbar buttons
- Auto-hides on: scroll, clicking elsewhere, Escape key

### 4. Service Worker as LLM API Proxy (Issue #4) ✅
- Background service worker receives `ANALYZE_TEXT` messages from content script
- Properly uses `return true` in `onMessage` listener to keep async channel open
- Routes to correct provider based on `chrome.storage.local` config
- Full error handling: network errors, HTTP errors, empty responses — all surface a user-friendly message

### 5. OpenAI Provider (Issue #5) ✅
- Calls `https://api.openai.com/v1/chat/completions`
- Strongly typed request/response with proper error extraction from OpenAI's error format
- Default model: `gpt-4o-mini`
- Also implemented: **Anthropic**, **Groq**, and **OpenRouter** providers (all with proper error handling)

### 6. Options Page (Issue #6) ✅
- Dark-themed, polished UI matching the toolbar aesthetic
- Provider selector (OpenAI, Anthropic, Groq, OpenRouter)
- Model selector (auto-populated per provider)
- Password input with show/hide toggle
- "Get API key →" link per provider
- Saves to `chrome.storage.local` with visual feedback: idle → saving → saved/error
- Enter key triggers save

### 7. Result Modal with Replace Button (Issue #7) ✅
- Full-screen dark overlay with centered modal
- Shows the LLM suggestion in a styled code block
- **Replace** button: calls `replaceText()` which properly handles both textarea/input and DOM selection paths
- **Copy** button: copies to clipboard with confirmation flash
- **Dismiss** button and overlay click to close
- Escape key closes the modal
- Error state shown cleanly with ❌ prefix

---

## Architecture

```
Content Script (content.ts)
  ├── Detects text selection (textarea / input / contenteditable)
  ├── Shows floating toolbar above selection
  ├── On action click → sends ANALYZE_TEXT to service worker
  ├── Shows loading state while waiting
  └── Shows result modal with Replace/Copy/Dismiss

Background Service Worker (background.ts)
  ├── Listens for ANALYZE_TEXT messages
  ├── Reads provider/apiKey/model from chrome.storage.local
  └── Routes to OpenAI / Anthropic / Groq / OpenRouter

Options Page (Options.tsx)
  └── Saves provider/model/apiKey to chrome.storage.local

Popup (Popup.tsx)
  └── Shows current config status + link to Options
```

---

## Known Issues / Caveats

1. **No Tailwind CSS** — styles are all inline CSS objects. Tailwind was in devDependencies but WXT's PostCSS integration wasn't configured. Inline styles work reliably in extension content scripts (no host page CSS conflicts).

2. **Shadow DOM not used** — The toolbar/modal are injected directly into `document.body`. A shadow DOM would better isolate styles but adds complexity. The `data-lexai="true"` attribute prevents self-triggering.

3. **API key stored as plaintext** — TweetNaCl encryption (Issue #13) is in the backlog. For Phase 1, the key is in `chrome.storage.local` which is only accessible to the extension.

4. **Content-editable replace** — Uses Range API with `range.deleteContents()` + `insertNode()`. Falls back to `execCommand('insertText')` if range throws. Works on most sites but highly customized editors (like Google Docs) may not respond correctly.

5. **No streaming** — Responses are non-streaming (full response returned at once). Good enough for Phase 1; streaming UX can be a Phase 2 improvement.

---

## Build Output

```
.output/chrome-mv3/manifest.json               485 B
.output/chrome-mv3/options.html                379 B
.output/chrome-mv3/popup.html                  419 B
.output/chrome-mv3/background.js               5 kB
.output/chrome-mv3/chunks/client-*.js          142.52 kB
.output/chrome-mv3/chunks/options-*.js         5.66 kB
.output/chrome-mv3/chunks/popup-*.js           1.65 kB
.output/chrome-mv3/content-scripts/content.js  10.38 kB
Total: ~166 KB
```

---

## Files Changed

- `entrypoints/background.ts` — Complete rewrite with typed providers
- `entrypoints/content.ts` — Complete rewrite with proper selection/toolbar/modal
- `entrypoints/options/Options.tsx` — Complete rewrite with polished UI
- `package.json` + `package-lock.json` — Added `@wxt-dev/module-react`