"""
Lightweight Telegram bot poller to ensure the bot responds.
Does not depend on legacy sync DB middleware. Provides minimal /start handler.
"""
import asyncio
import logging
from typing import Optional

from aiogram import Bot, Dispatcher, Router, types
from aiogram.filters import Command

from app.core.config import get_settings

logger = logging.getLogger(__name__)


def build_router(name: str) -> Router:
    r = Router(name=name)

    @r.message(Command("start"))
    async def cmd_start(message: types.Message):
        await message.answer(
            "MY Network bot online. Use /help to get options.")

    @r.message(Command("help"))
    async def cmd_help(message: types.Message):
        await message.answer("Available: /start, /help")

    return r


async def _run_single_bot(token: str, name: str):
    bot = Bot(token)
    dp = Dispatcher()
    dp.include_router(build_router(name))
    logger.info("Starting Telegram bot polling", extra={"name": name})
    try:
        await dp.start_polling(bot, allowed_updates=dp.resolve_used_update_types())
    except Exception as e:
        logger.error("Bot polling failed", extra={"name": name, "error": str(e)})
        await bot.session.close()


async def start_bots_if_configured() -> list[asyncio.Task]:
    settings = get_settings()
    tasks: list[asyncio.Task] = []
    # Prefer TELEGRAM_WEBHOOK_ENABLED to avoid double-processing
    webhook_enabled = bool(getattr(settings, 'TELEGRAM_WEBHOOK_ENABLED', False))
    if webhook_enabled:
        logger.info("Telegram webhook enabled; skipping polling start")
        return tasks

    # Main bot
    token: Optional[str] = getattr(settings, 'TELEGRAM_API_KEY', None)
    if token:
        tasks.append(asyncio.create_task(_run_single_bot(token, 'main')))

    # Client bot
    ct: Optional[str] = getattr(settings, 'CLIENT_TELEGRAM_API_KEY', None)
    if ct:
        tasks.append(asyncio.create_task(_run_single_bot(ct, 'client')))

    if tasks:
        logger.info("Telegram bots polling started", extra={"count": len(tasks)})
    else:
        logger.info("No Telegram tokens configured; polling not started")
    return tasks