"""Notifiche Telegram per il paper trader."""
from __future__ import annotations

import os
import urllib.request
import urllib.parse
import json

BOT_TOKEN = os.environ.get("TELEGRAM_BOT_TOKEN", "")
CHAT_ID = os.environ.get("TELEGRAM_CHAT_ID", "")

NOTIFY_EVENTS = {
    "SIGNAL", "OPENED", "CLOSED", "OPEN_FAILED", "CLOSE_FAILED",
    "ERROR", "STARTUP", "SHUTDOWN", "TRAINING_FAILED",
}


def send_telegram(text: str) -> bool:
    if not BOT_TOKEN or not CHAT_ID:
        return False
    try:
        url = f"https://api.telegram.org/bot{BOT_TOKEN}/sendMessage"
        data = urllib.parse.urlencode({"chat_id": CHAT_ID, "text": text, "parse_mode": "HTML"}).encode()
        urllib.request.urlopen(url, data, timeout=10)
        return True
    except Exception:
        return False


def notify_event(event: str, data: dict | None = None):
    if event not in NOTIFY_EVENTS:
        return
    lines = [f"📊 <b>{event}</b>"]
    if data:
        for k, v in data.items():
            if k in ("signal",):
                continue
            lines.append(f"  {k}: {v}")
    send_telegram("\n".join(lines))