from __future__ import annotations

import asyncio
import logging

from app.binance import (
    chart_kline_limit,
    chart_right_pad,
    fetch_klines,
    get_tick_size,
    interval_timedelta,
    to_binance_interval,
    to_binance_symbol,
)
from app.chart import render_setup_chart
from app.config import Settings
from app.formatter import format_caption
from app.heryon import build_heryon_payload, send_heryon, to_tv_perp_ticker
from app.indicators.common import IndicatorSignal, format_px, realized_pnl_pct
from app.models import SignalPayload
from app.state import ScannerStore
from app.telegram import TelegramError, send_message, send_photo, telegram_message_id

logger = logging.getLogger(__name__)


def to_telegram_payload(signal: IndicatorSignal, ticker: str) -> SignalPayload:
    tick = get_tick_size(ticker)
    return SignalPayload(
        ticker=ticker,
        action=signal.side,
        entry_price=format_px(signal.entry, tick),
        current_price=format_px(signal.close, tick),
        stop_loss_price=format_px(signal.sl, tick),
        take_profit_1_price=format_px(signal.tp1, tick),
        take_profit_2_price=format_px(signal.tp2, tick) or None,
        take_profit_3_price=format_px(signal.tp3, tick) or None,
        visual_timeframe=signal.visual_timeframe,
        signal_sequence=1,
        signal_time=signal.bar_open_ts,
    )


async def deliver_telegram(
    settings: Settings,
    signal: SignalPayload,
    message_thread_id: int,
    *,
    store: ScannerStore | None = None,
) -> None:
    """Fetch chart + post to Telegram (used by inbound webhook and scanner)."""
    caption = format_caption(signal)
    photo: bytes | None = None
    chart_error: str | None = None
    owns_store = store is None
    db = store or ScannerStore(settings.scanner_state_path)
    reply_id = db.get_last_tg_message(message_thread_id, signal.ticker)

    try:
        symbol = to_binance_symbol(signal.ticker)
        interval = to_binance_interval(signal.visual_timeframe)
        limit = chart_kline_limit(interval)
        if signal.prev_signal_time and signal.prev_signal_time > 0:
            bar_sec = interval_timedelta(interval).total_seconds()
            if bar_sec > 0:
                span = int((signal.signal_time - signal.prev_signal_time) / bar_sec) + 24
                limit = min(1500, max(limit, span))
        df = await fetch_klines(symbol, interval, limit=limit)
        # LTF 15m: chart shows TP1 + remainder green (like FVG); caption still has TP2/TP3.
        chart_tp2 = None if interval == "15m" else signal.take_profit_2_price
        chart_tp3 = None if interval == "15m" else signal.take_profit_3_price
        photo = await asyncio.to_thread(
            render_setup_chart,
            df,
            ticker=signal.ticker,
            action=signal.action.value,
            entry=signal.entry_price,
            stop_loss=signal.stop_loss_price,
            tp1=signal.take_profit_1_price,
            tp2=chart_tp2,
            tp3=chart_tp3,
            timeframe=signal.visual_timeframe,
            current_price=(
                signal.current_price if signal.signal_sequence > 1 else None
            ),
            signal_time=signal.signal_time,
            right_pad=chart_right_pad(interval),
            prev_entry=signal.prev_entry_price,
            prev_side=signal.prev_side,
            prev_signal_time=signal.prev_signal_time,
        )
    except Exception as exc:  # noqa: BLE001 — fallback to text-only post
        chart_error = str(exc)
        logger.exception("Chart generation failed, falling back to text-only: %s", exc)

    try:
        if photo is not None:
            response = await send_photo(
                settings,
                photo=photo,
                caption=caption,
                message_thread_id=message_thread_id,
                reply_to_message_id=reply_id,
            )
        else:
            response = await send_message(
                settings,
                text=caption,
                message_thread_id=message_thread_id,
                reply_to_message_id=reply_id,
            )
        message_id = telegram_message_id(response)
        if message_id is not None:
            db.set_last_tg_message(message_thread_id, signal.ticker, message_id)
        logger.info(
            "Delivered %s: %s %s seq=%s thread=%s chart_error=%s",
            "photo" if photo is not None else "text",
            signal.ticker,
            signal.action.value,
            signal.signal_sequence,
            message_thread_id,
            chart_error,
        )
    except TelegramError as exc:
        logger.exception("Telegram delivery failed: %s", exc)
    except Exception as exc:  # noqa: BLE001
        logger.exception("Unexpected delivery error: %s", exc)
    finally:
        if owns_store:
            db.close()


async def deliver_generated(
    settings: Settings,
    signal: IndicatorSignal,
    symbol: str,
    message_thread_id: int,
    *,
    store: ScannerStore | None = None,
) -> None:
    ticker = to_tv_perp_ticker(symbol)
    telegram_payload = to_telegram_payload(signal, ticker)
    if store is not None:
        previous = store.get_last_open(signal.strategy_id, symbol)
        if previous is not None:
            prev_side, prev_entry, prev_ts = previous
            if prev_side != signal.side:
                tick = get_tick_size(ticker)
                telegram_payload = telegram_payload.model_copy(
                    update={
                        "is_reversal": True,
                        "realized_pnl_pct": realized_pnl_pct(
                            prev_side, prev_entry, signal.entry
                        ),
                        "prev_side": prev_side,
                        "prev_entry_price": format_px(prev_entry, tick),
                        "prev_signal_time": prev_ts or None,
                    }
                )
    heryon_payload = build_heryon_payload(signal, symbol=symbol, settings=settings)

    await deliver_telegram(
        settings,
        telegram_payload,
        message_thread_id,
        store=store,
    )
    if store is not None:
        store.set_last_open(
            signal.strategy_id,
            symbol,
            signal.side,
            signal.entry,
            signal.bar_open_ts,
        )
    try:
        await send_heryon(settings, heryon_payload)
    except Exception as exc:  # noqa: BLE001
        logger.exception(
            "Heryon send failed nonce=%s: %s", heryon_payload.get("nonce"), exc
        )