"""Telegram alerting for status changes."""
import os
from datetime import datetime
from typing import Optional

import httpx


TELEGRAM_BOT_TOKEN = os.getenv("TELEGRAM_BOT_TOKEN", "")
TELEGRAM_ADMIN_ID = os.getenv("TELEGRAM_ADMIN_ID", "")


async def send_telegram_alert(message: str, is_recovery: bool = False) -> bool:
    """Send alert to Telegram."""
    if not TELEGRAM_BOT_TOKEN or not TELEGRAM_ADMIN_ID:
        print("Telegram alerting not configured")
        return False

    emoji = "\u2705" if is_recovery else "\u26a0\ufe0f"
    text = f"{emoji} *Status Alert*\n\n{message}"

    url = f"https://api.telegram.org/bot{TELEGRAM_BOT_TOKEN}/sendMessage"
    data = {
        "chat_id": TELEGRAM_ADMIN_ID,
        "text": text,
        "parse_mode": "Markdown",
    }

    try:
        async with httpx.AsyncClient(timeout=10.0) as client:
            response = await client.post(url, json=data)
            response.raise_for_status()
            print(f"Telegram alert sent: {message[:50]}...")
            return True
    except Exception as e:
        print(f"Failed to send Telegram alert: {e}")
        return False


async def alert_service_down(service_name: str, display_name: str, message: Optional[str]):
    """Alert when service goes down."""
    now = datetime.now().strftime("%d.%m.%Y %H:%M:%S")
    text = (
        f"*{display_name}* is DOWN\n\n"
        f"Time: `{now}`\n"
    )
    if message:
        text += f"Error: `{message}`"

    await send_telegram_alert(text, is_recovery=False)


async def alert_service_recovered(service_name: str, display_name: str, downtime_minutes: int):
    """Alert when service recovers."""
    now = datetime.now().strftime("%d.%m.%Y %H:%M:%S")
    text = (
        f"*{display_name}* is back ONLINE\n\n"
        f"Time: `{now}`\n"
        f"Downtime: `{downtime_minutes} min`"
    )

    await send_telegram_alert(text, is_recovery=True)


async def alert_ssl_expiring(domain: str, days_left: int):
    """Alert when SSL certificate is expiring soon."""
    text = (
        f"*SSL Certificate Expiring*\n\n"
        f"Domain: `{domain}`\n"
        f"Days left: `{days_left}`\n\n"
        f"Please renew the certificate!"
    )

    await send_telegram_alert(text, is_recovery=False)


async def alert_ssl_expired(domain: str):
    """Alert when SSL certificate has expired."""
    text = (
        f"*SSL Certificate EXPIRED*\n\n"
        f"Domain: `{domain}`\n\n"
        f"Certificate has expired! Site may show security warnings."
    )

    await send_telegram_alert(text, is_recovery=False)