# Japanese Language Mode - Complete Implementation Summary

## ✅ Implementation Complete!

Successfully implemented **Japanese language mode** for the Miku Discord bot with a full Web UI integration.

---

## 📋 What Was Built

### Backend Components (Python)

**Files Modified:**
1. **globals.py**
   - Added `JAPANESE_TEXT_MODEL = "swallow"` constant
   - Added `LANGUAGE_MODE = "english"` global variable

2. **utils/context_manager.py**
   - Added `get_japanese_miku_prompt()` function
   - Added `get_japanese_miku_lore()` function
   - Added `get_japanese_miku_lyrics()` function
   - Updated `get_complete_context()` to check language mode
   - Updated `get_context_for_response_type()` to check language mode

3. **utils/llm.py**
   - Updated `query_llama()` model selection logic
   - Now checks `LANGUAGE_MODE` and selects Swallow when Japanese

4. **api.py**
   - Added `GET /language` endpoint
   - Added `POST /language/toggle` endpoint
   - Added `POST /language/set?language=X` endpoint

**Files Created:**
1. **miku_prompt_jp.txt** - Japanese-mode prompt with language instruction
2. **miku_lore_jp.txt** - Japanese-mode lore
3. **miku_lyrics_jp.txt** - Japanese-mode lyrics

### Frontend Components (HTML/JavaScript)

**File Modified:** `bot/static/index.html`

1. **Tab Navigation** (Line ~660)
   - Added "⚙️ LLM Settings" tab between Status and Image Generation
   - Updated all subsequent tab IDs (tab4→tab5, tab5→tab6, etc.)

2. **LLM Settings Tab** (Line ~1177)
   - Language Mode toggle section with blue highlight
   - Current status display showing language and model
   - Information panel explaining how it works
   - Two-column layout for better organization

3. **JavaScript Functions** (Line ~2320)
   - `refreshLanguageStatus()` - Fetches and displays current language
   - `toggleLanguageMode()` - Switches between English and Japanese

4. **Page Initialization** (Line ~1617)
   - Added `refreshLanguageStatus()` to DOMContentLoaded event
   - Ensures language status is loaded when page opens

---

## 🎯 How It Works

### Language Switching Flow

```
User clicks "Toggle Language" button
         ↓
toggleLanguageMode() sends POST to /language/toggle
         ↓
API updates globals.LANGUAGE_MODE ("english" ↔ "japanese")
         ↓
Next message:
  - If Japanese: Use Swallow model + miku_prompt_jp.txt
  - If English: Use llama3.1 model + miku_prompt.txt
         ↓
Response generated in selected language
         ↓
UI updates to show new language and model
```

### Design Philosophy

**No Full Translation Needed!**
- English context helps model understand Miku's personality
- Language instruction appended to prompt ensures Japanese response
- Swallow model is trained to follow instructions and respond in Japanese
- Minimal maintenance - one source of truth for prompts

---

## 🖥️ Web UI Features

### LLM Settings Tab (tab4)

**Language Mode Section**
- Blue-highlighted toggle button
- Current language display in cyan text
- Explanation of English vs Japanese modes
- Easy-to-understand bullet points

**Status Display**
- Shows current language (English or 日本語)
- Shows active model (llama3.1 or swallow)
- Shows available languages
- Refresh button to sync with server

**Information Panel**
- Orange-highlighted info section
- Explains how each language mode works
- Notes about global scope and conversation history

### Button Styling
- **Toggle Button**: Blue (#4a7bc9) with cyan border, bold, 1rem font
- **Refresh Button**: Standard styling, lightweight
- Hover effects work with existing CSS
- Fully responsive design

---

## 📡 API Endpoints

### GET `/language`
Returns current language status:
```json
{
  "language_mode": "english",
  "available_languages": ["english", "japanese"],
  "current_model": "llama3.1"
}
```

### POST `/language/toggle`
Toggles between languages:
```json
{
  "status": "ok",
  "language_mode": "japanese",
  "model_now_using": "swallow",
  "message": "Miku is now speaking in JAPANESE!"
}
```

### POST `/language/set?language=japanese`
Sets specific language:
```json
{
  "status": "ok",
  "language_mode": "japanese",
  "model_now_using": "swallow",
  "message": "Miku is now speaking in JAPANESE!"
}
```

---

## 🔧 Technical Details

| Component | English | Japanese |
|-----------|---------|----------|
| **Model** | `llama3.1` | `swallow` |
| **Prompt** | miku_prompt.txt | miku_prompt_jp.txt |
| **Lore** | miku_lore.txt | miku_lore_jp.txt |
| **Lyrics** | miku_lyrics.txt | miku_lyrics_jp.txt |
| **Language Instruction** | None | "Respond entirely in Japanese" |

### Model Selection Priority
1. **Evil Mode** takes highest priority (uses DarkIdol)
2. **Language Mode** second (uses Swallow for Japanese)
3. **Default** is English mode (uses llama3.1)

---

## ✨ Features

✅ **Complete Language Toggle** - Switch English ↔ Japanese instantly
✅ **Automatic Model Switching** - Swallow loads when needed, doesn't interfere with other models
✅ **Web UI Integration** - Beautiful, intuitive interface with proper styling
✅ **Status Display** - Shows current language and model in real-time
✅ **Real-time Updates** - UI refreshes immediately on page load and after toggle
✅ **Backward Compatible** - Works with all existing features (moods, evil mode, etc.)
✅ **Conversation Continuity** - History preserved across language switches
✅ **Global Scope** - One setting affects all servers and DMs
✅ **Notification Feedback** - User gets confirmation when language changes

---

## 🧪 Testing Guide

### Quick Test (Via API)
```bash
# Check current language
curl http://localhost:8000/language

# Toggle to Japanese
curl -X POST http://localhost:8000/language/toggle

# Set to English specifically
curl -X POST "http://localhost:8000/language/set?language=english"
```

### Full UI Test
1. Open web UI at http://localhost:8000/static/
2. Go to "⚙️ LLM Settings" tab (between Status and Image Generation)
3. Click "🔄 Toggle Language (English ↔ Japanese)" button
4. Observe current language changes in display
5. Click "🔄 Refresh Status" to sync
6. Send a message to Miku in Discord
7. Check if response is in Japanese
8. Toggle back and verify English responses

---

## 📁 Files Summary

### Modified Files
- `bot/globals.py` - Added language constants
- `bot/utils/context_manager.py` - Added language-aware context loaders
- `bot/utils/llm.py` - Added language-based model selection
- `bot/api.py` - Added 3 new language endpoints
- `bot/static/index.html` - Added LLM Settings tab and functions

### Created Files
- `bot/miku_prompt_jp.txt` - Japanese prompt variant
- `bot/miku_lore_jp.txt` - Japanese lore variant
- `bot/miku_lyrics_jp.txt` - Japanese lyrics variant
- `JAPANESE_MODE_IMPLEMENTATION.md` - Technical documentation
- `JAPANESE_MODE_QUICK_START.md` - Quick reference guide
- `WEB_UI_LANGUAGE_INTEGRATION.md` - Web UI documentation
- `JAPANESE_MODE_WEB_UI_SUMMARY.md` - This file

---

## 🚀 Future Enhancements

### Phase 2 Ideas
1. **Per-Server Language** - Store language preference in servers_config.json
2. **Per-Channel Language** - Different channels can have different languages
3. **Language Auto-Detection** - Detect user's language and auto-switch
4. **More Languages** - Easily add other languages (Spanish, French, etc.)
5. **Language-Specific Moods** - Different mood descriptions per language
6. **Language Status in Main Status Tab** - Show language in status overview
7. **Language Preference Persistence** - Remember user's preferred language

---

## ⚠️ Important Notes

1. **Swallow Model** must be available in llama-swap with name "swallow"
2. **Language Mode is Global** - affects all servers and DMs
3. **Evil Mode Takes Priority** - evil mode's model selection wins if both active
4. **Conversation History** - stores both English and Japanese messages seamlessly
5. **No Translation Burden** - English prompts work fine with Swallow

---

## 📚 Documentation Files

1. **JAPANESE_MODE_IMPLEMENTATION.md** - Technical architecture and design decisions
2. **JAPANESE_MODE_QUICK_START.md** - API endpoints and quick reference
3. **WEB_UI_LANGUAGE_INTEGRATION.md** - Detailed Web UI changes
4. **This file** - Complete summary

---

## ✅ Checklist

- [x] Backend language mode support
- [x] Model switching logic
- [x] Japanese context files created
- [x] API endpoints implemented
- [x] Web UI tab added
- [x] JavaScript functions added
- [x] Page initialization updated
- [x] Styling and layout finalized
- [x] Error handling implemented
- [x] Documentation completed

---

## 🎉 You're Ready!

The Japanese language mode is fully implemented and ready to use:
1. Visit the Web UI
2. Go to "⚙️ LLM Settings" tab
3. Click the toggle button
4. Miku will now respond in Japanese!

Enjoy your bilingual Miku! 🎤✨