# featherChat Bot Development Reference

## Setup

Server: `http://HOST:7700`
All bot endpoints: `/v1/bot/<TOKEN>/METHOD`

Register bot:
```
POST /v1/bot/register
{"name":"MyBot","fingerprint":"any_32_hex_chars"}
→ {"ok":true,"result":{"token":"TOKEN","alias":"@mybot_bot"}}
```

Bot names must end with Bot/bot/_bot. Token format: `<fp_prefix>:<random_hex>`.

## Endpoints

### getMe
```
GET /v1/bot/TOKEN/getMe
→ {"ok":true,"result":{"id":"fp","is_bot":true,"first_name":"MyBot","username":"MyBot"}}
```

### getUpdates (long-poll)
```
POST /v1/bot/TOKEN/getUpdates
{"offset":LAST_UPDATE_ID+1,"timeout":30,"limit":100}
→ {"ok":true,"result":[{"update_id":N,"message":{...}}]}
```

offset: skip updates with id < offset (acknowledge processed)
timeout: long-poll seconds (max 30)
limit: max updates to return (default 100)

### sendMessage
```
POST /v1/bot/TOKEN/sendMessage
{
  "chat_id": "FINGERPRINT",
  "text": "Hello!",
  "parse_mode": "HTML",                    // optional
  "reply_to_message_id": "MSG_ID",         // optional
  "reply_markup": {                         // optional, inline keyboard
    "inline_keyboard": [
      [{"text":"Yes","callback_data":"yes"},{"text":"No","callback_data":"no"}]
    ]
  }
}
→ {"ok":true,"result":{"message_id":"UUID","delivered":true}}
```

### answerCallbackQuery
```
POST /v1/bot/TOKEN/answerCallbackQuery
{"callback_query_id":"ID","text":"Done!","show_alert":false}
→ {"ok":true,"result":true}
```

### editMessageText
```
POST /v1/bot/TOKEN/editMessageText
{"chat_id":"FP","message_id":"MSG_ID","text":"Updated text","reply_markup":{...}}
```

### sendDocument
```
POST /v1/bot/TOKEN/sendDocument
{"chat_id":"FP","document":"filename_or_url","caption":"optional"}
```

### setWebhook / deleteWebhook / getWebhookInfo
```
POST /v1/bot/TOKEN/setWebhook {"url":"https://mybot.example.com/webhook"}
POST /v1/bot/TOKEN/deleteWebhook
GET  /v1/bot/TOKEN/getWebhookInfo
```

## Update Types

Messages from users arrive in getUpdates as:

**Plaintext (from other bots):**
```json
{"update_id":1,"message":{"message_id":"id","from":{"id":"fp","is_bot":true},"chat":{"id":"fp","type":"private"},"text":"Hello"}}
```

**Encrypted (from users with E2E sessions):**
```json
{"update_id":2,"message":{"message_id":"id","from":{"id":"fp","is_bot":false},"chat":{"id":"fp"},"text":null,"raw_encrypted":"base64..."}}
```
Note: v1 bots cannot decrypt E2E messages. They see text=null + raw_encrypted blob.

**Call signal:**
```json
{"update_id":3,"message":{"text":"/call_Offer","call_signal":{"type":"Offer","payload":"..."}}}
```

**File:**
```json
{"update_id":4,"message":{"document":{"file_name":"report.pdf","file_size":1234}}}
```

## Python Examples

### Echo Bot
```python
import requests, time

TOKEN = "YOUR_TOKEN"
API = f"http://localhost:7700/v1/bot/{TOKEN}"
offset = 0

while True:
    resp = requests.post(f"{API}/getUpdates", json={"offset": offset, "timeout": 30}).json()
    for update in resp.get("result", []):
        offset = update["update_id"] + 1
        msg = update.get("message", {})
        chat_id = msg.get("chat", {}).get("id", "")
        text = msg.get("text")
        if text and chat_id:
            requests.post(f"{API}/sendMessage", json={"chat_id": chat_id, "text": f"Echo: {text}"})
```

### Inline Keyboard Bot
```python
import requests

TOKEN = "YOUR_TOKEN"
API = f"http://localhost:7700/v1/bot/{TOKEN}"
offset = 0

def send_menu(chat_id):
    requests.post(f"{API}/sendMessage", json={
        "chat_id": chat_id,
        "text": "Choose an option:",
        "reply_markup": {
            "inline_keyboard": [
                [{"text": "Option A", "callback_data": "a"}, {"text": "Option B", "callback_data": "b"}],
                [{"text": "Help", "callback_data": "help"}]
            ]
        }
    })

while True:
    resp = requests.post(f"{API}/getUpdates", json={"offset": offset, "timeout": 30}).json()
    for update in resp.get("result", []):
        offset = update["update_id"] + 1
        msg = update.get("message", {})
        text = msg.get("text", "")
        chat_id = msg.get("chat", {}).get("id", "")
        if text == "/start":
            send_menu(chat_id)
        elif text:
            requests.post(f"{API}/sendMessage", json={"chat_id": chat_id, "text": f"You said: {text}"})
```

### Node.js Echo Bot
```javascript
const API = `http://localhost:7700/v1/bot/${process.env.BOT_TOKEN}`;
let offset = 0;

async function poll() {
  while (true) {
    try {
      const res = await fetch(`${API}/getUpdates`, {
        method: 'POST',
        headers: {'Content-Type': 'application/json'},
        body: JSON.stringify({offset, timeout: 30})
      });
      const data = await res.json();
      for (const update of data.result || []) {
        offset = update.update_id + 1;
        const msg = update.message;
        if (msg?.text && msg?.chat?.id) {
          await fetch(`${API}/sendMessage`, {
            method: 'POST',
            headers: {'Content-Type': 'application/json'},
            body: JSON.stringify({chat_id: msg.chat.id, text: `Echo: ${msg.text}`})
          });
        }
      }
    } catch (e) { console.error(e); await new Promise(r => setTimeout(r, 3000)); }
  }
}
poll();
```

## Differences from Telegram

| Feature | Telegram | featherChat |
|---------|----------|------------|
| chat_id | numeric | hex fingerprint string |
| getUpdates timeout | up to 50s | up to 30s |
| User messages | plaintext | E2E encrypted (text=null in v1) |
| Bot messages | plaintext | plaintext (no E2E) |
| File upload | multipart form | JSON reference (v1) |
| Inline keyboards | full support | stored + delivered, no popup |
| Callback queries | full popup | acknowledged, no popup |
| Webhooks | full HTTPS | URL stored, delivery planned |
| Media groups | supported | not yet |
| parse_mode | renders HTML/MD | stored, not rendered (v1) |

## Key Patterns

**Always use offset** — without it, the same messages are returned every poll.

**chat_id is the sender's fingerprint** — use `msg.chat.id` or `msg.from.id`.

**Bot alias** — users message bots via `@mybot_bot` which resolves to the bot's fingerprint.

**Error handling** — all responses have `{"ok": bool}`. Check `ok` before accessing `result`.

**Rate limits** — 200 concurrent server requests, no per-bot limit (be reasonable).