# Message Reaction Feature

## Overview
This feature allows you to make Miku react to any message in Discord with a specific emoji of your choice through the Web UI.

## How to Use

### From the Web UI

1. **Navigate to the Actions Tab**
   - Open the Miku Control Panel (http://your-server:3939)
   - Click on the "Actions" tab

2. **Find the "Add Reaction to Message" Section**
   - Scroll down to find the "😊 Add Reaction to Message" section

3. **Fill in the Required Information**
   - **Message ID**: Right-click on the target message in Discord → "Copy ID"
   - **Channel ID**: Right-click on the channel name → "Copy ID"
   - **Emoji**: Enter the emoji you want Miku to react with (e.g., 💙, 👍, 🎉)

4. **Click "Add Reaction"**
   - Miku will add the specified reaction to the message
   - You'll see a success confirmation message

### Requirements

- **Discord Developer Mode**: You need to enable Developer Mode in Discord to copy message and channel IDs
  - Settings → Advanced → Developer Mode (toggle ON)

### Supported Emoji Types

- **Standard Unicode Emoji**: 💙, 👍, 🎉, ❤️, etc.
- **Custom Server Emoji**: Use the format `:emoji_name:` for custom Discord emojis

### API Endpoint

If you want to integrate this programmatically:

```bash
POST /messages/react
Content-Type: multipart/form-data

message_id: <Discord message ID>
channel_id: <Discord channel ID>
emoji: <emoji string>
```

### Example Response

Success:
```json
{
  "status": "ok",
  "message": "Reaction 💙 queued for message 123456789"
}
```

Error:
```json
{
  "status": "error",
  "message": "Channel 123456789 not found"
}
```

## Troubleshooting

- **"Channel not found"**: Make sure Miku is in the server that contains that channel
- **"Message not found"**: Verify the message ID is correct and still exists
- **"Permission denied"**: Miku needs the "Add Reactions" permission in that channel
- **Invalid emoji**: Make sure you're using a valid emoji format

## Technical Details

- The reaction is added asynchronously by the Discord bot
- The Web UI receives immediate confirmation that the request was queued
- If the reaction fails (e.g., due to permissions), an error will be logged in the bot logs