"""Telegram notification service.

Sends formatted trade alerts, daily reports, and error
notifications to a configured Telegram chat.
"""

from __future__ import annotations

from typing import Optional

from loguru import logger

from config import settings

try:
    from telegram import Bot
    from telegram.constants import ParseMode
except ImportError:
    Bot = None  # type: ignore
    ParseMode = None  # type: ignore
    logger.warning("python-telegram-bot not installed")


class TelegramNotifier:
    """Send trading notifications via Telegram."""

    def __init__(
        self,
        token: str | None = None,
        chat_id: str | None = None,
    ):
        self._token = token or settings.TELEGRAM_BOT_TOKEN
        self._chat_id = chat_id or settings.TELEGRAM_CHAT_ID
        self._bot: Optional[object] = None
        self._enabled = bool(self._token and self._chat_id and Bot is not None)

    async def _get_bot(self):
        if self._bot is None and Bot is not None:
            self._bot = Bot(token=self._token)
        return self._bot

    async def _send(self, text: str) -> None:
        """Send a message to the configured chat."""
        if not self._enabled:
            logger.debug("Telegram disabled, skipping message")
            return
        try:
            bot = await self._get_bot()
            await bot.send_message(
                chat_id=self._chat_id,
                text=text,
                parse_mode=ParseMode.HTML if ParseMode else None,
            )
        except Exception as e:
            logger.error("Telegram send failed: {}", e)

    # ------------------------------------------------------------------
    # Signal alerts
    # ------------------------------------------------------------------

    async def send_signal(
        self,
        symbol: str,
        direction: str,
        entry_price: float,
        stop_loss: float,
        take_profit: float,
        confluence: int,
        reasons: list[str] | None = None,
    ) -> None:
        """Send a new trade signal notification."""
        sl_pct = abs(entry_price - stop_loss) / entry_price * 100
        tp_pct = abs(take_profit - entry_price) / entry_price * 100
        reasons_str = " + ".join(reasons) if reasons else "N/A"

        text = (
            f"<b>ICT Signal Detected</b>\n"
            f"{'=' * 24}\n"
            f"Symbol   : {symbol}\n"
            f"Direction: {direction}\n"
            f"Entry    : ${entry_price:,.2f}\n"
            f"SL       : ${stop_loss:,.2f} (-{sl_pct:.2f}%)\n"
            f"TP       : ${take_profit:,.2f} (+{tp_pct:.2f}%)\n"
            f"Confluence: {confluence}/6\n"
            f"Reasons  : {reasons_str}"
        )
        await self._send(text)

    async def send_fill(
        self,
        symbol: str,
        side: str,
        amount: float,
        price: float,
        order_type: str = "market",
    ) -> None:
        """Notify when an order is filled."""
        text = (
            f"<b>Order Filled</b>\n"
            f"{'=' * 24}\n"
            f"Symbol: {symbol}\n"
            f"Side  : {side.upper()}\n"
            f"Type  : {order_type}\n"
            f"Amount: {amount:.6f}\n"
            f"Price : ${price:,.2f}"
        )
        await self._send(text)

    async def send_close(
        self,
        symbol: str,
        direction: str,
        entry_price: float,
        exit_price: float,
        pnl: float,
        reason: str,
    ) -> None:
        """Notify when a position is closed."""
        emoji = "+" if pnl >= 0 else ""
        text = (
            f"<b>Position Closed</b>\n"
            f"{'=' * 24}\n"
            f"Symbol   : {symbol}\n"
            f"Direction: {direction}\n"
            f"Entry    : ${entry_price:,.2f}\n"
            f"Exit     : ${exit_price:,.2f}\n"
            f"PnL      : {emoji}${pnl:,.2f}\n"
            f"Reason   : {reason}"
        )
        await self._send(text)

    async def send_daily_report(
        self,
        date_str: str,
        total_trades: int,
        winning: int,
        losing: int,
        total_pnl: float,
        win_rate: float,
        balance: float,
    ) -> None:
        """Send end-of-day performance summary."""
        text = (
            f"<b>Daily Report - {date_str}</b>\n"
            f"{'=' * 24}\n"
            f"Trades   : {total_trades}\n"
            f"Wins     : {winning}\n"
            f"Losses   : {losing}\n"
            f"Win Rate : {win_rate:.1%}\n"
            f"PnL      : ${total_pnl:,.2f}\n"
            f"Balance  : ${balance:,.2f}"
        )
        await self._send(text)

    async def send_error(self, error: str) -> None:
        """Send an error notification."""
        text = f"<b>BOT ERROR</b>\n{'=' * 24}\n{error}"
        await self._send(text)

    async def send_emergency(self, msg: str) -> None:
        """Send an emergency stop notification."""
        text = f"<b>EMERGENCY STOP</b>\n{'=' * 24}\n{msg}"
        await self._send(text)