"""
Translate a strategy signal into a direct-exchange order call.

Supports:
- Crypto exchanges: Binance, OKX, Bitget, Bybit, Coinbase, Kraken, KuCoin, Gate, Bitfinex
- Traditional brokers: Interactive Brokers (IBKR) for US stocks
- Forex brokers: MetaTrader 5 (MT5)
"""

from __future__ import annotations

from typing import Any, Dict, Optional, Tuple

from app.services.live_trading.base import BaseRestClient, LiveOrderResult, LiveTradingError
from app.services.live_trading.binance import BinanceFuturesClient
from app.services.live_trading.binance_spot import BinanceSpotClient
from app.services.live_trading.okx import OkxClient
from app.services.live_trading.bitget import BitgetMixClient
from app.services.live_trading.bitget_spot import BitgetSpotClient
from app.services.live_trading.bybit import BybitClient
from app.services.live_trading.coinbase_exchange import CoinbaseExchangeClient
from app.services.live_trading.kraken import KrakenClient
from app.services.live_trading.kraken_futures import KrakenFuturesClient
from app.services.live_trading.kucoin import KucoinSpotClient
from app.services.live_trading.kucoin import KucoinFuturesClient
from app.services.live_trading.gate import GateSpotClient, GateUsdtFuturesClient
from app.services.live_trading.bitfinex import BitfinexClient, BitfinexDerivativesClient

# Lazy import IBKR
IBKRClient = None

# Lazy import MT5
MT5Client = None


def _signal_to_sides(signal_type: str) -> Tuple[str, str, bool]:
    """
    Returns (side, pos_side, reduce_only)
    - side: buy/sell
    - pos_side: long/short (for OKX)
    """
    sig = (signal_type or "").strip().lower()
    if sig in ("open_long", "add_long"):
        return "buy", "long", False
    if sig in ("open_short", "add_short"):
        return "sell", "short", False
    if sig in ("close_long", "reduce_long"):
        return "sell", "long", True
    if sig in ("close_short", "reduce_short"):
        return "buy", "short", True
    raise LiveTradingError(f"Unsupported signal_type: {signal_type}")


def place_order_from_signal(
    client: BaseRestClient,
    *,
    signal_type: str,
    symbol: str,
    amount: float,
    market_type: str = "swap",
    exchange_config: Optional[Dict[str, Any]] = None,
    client_order_id: Optional[str] = None,
) -> LiveOrderResult:
    if amount is None:
        amount = 0.0
    qty = float(amount or 0.0)
    if qty <= 0:
        raise LiveTradingError("Invalid amount")

    side, pos_side, reduce_only = _signal_to_sides(signal_type)

    cfg = exchange_config if isinstance(exchange_config, dict) else {}
    mt = (market_type or cfg.get("market_type") or "swap").strip().lower()
    if mt in ("futures", "future", "perp", "perpetual"):
        mt = "swap"

    # Spot does not support short signals in this system.
    if mt == "spot" and ("short" in (signal_type or "").lower()):
        raise LiveTradingError("spot market does not support short signals")

    if isinstance(client, BinanceFuturesClient):
        return client.place_market_order(
            symbol=symbol,
            side="BUY" if side == "buy" else "SELL",
            quantity=qty,
            reduce_only=reduce_only,
            position_side=pos_side,
            client_order_id=client_order_id,
        )
    if isinstance(client, OkxClient):
        td_mode = (cfg.get("margin_mode") or cfg.get("td_mode") or "cross")
        return client.place_market_order(
            symbol=symbol,
            side=side,
            pos_side=pos_side,
            size=qty,
            td_mode=str(td_mode),
            reduce_only=reduce_only,
            client_order_id=client_order_id,
        )
    if isinstance(client, BitgetMixClient):
        margin_coin = str(cfg.get("margin_coin") or cfg.get("marginCoin") or "USDT")
        product_type = str(cfg.get("product_type") or cfg.get("productType") or "USDT-FUTURES")
        margin_mode = str(cfg.get("margin_mode") or cfg.get("marginMode") or cfg.get("td_mode") or "cross")
        return client.place_market_order(
            symbol=symbol,
            side=side,
            size=qty,
            margin_coin=margin_coin,
            product_type=product_type,
            margin_mode=margin_mode,
            reduce_only=reduce_only,
            client_order_id=client_order_id,
        )
    if isinstance(client, BinanceSpotClient):
        return client.place_market_order(
            symbol=symbol,
            side="BUY" if side == "buy" else "SELL",
            quantity=qty,
            client_order_id=client_order_id,
        )
    if isinstance(client, BitgetSpotClient):
        # For spot market BUY, Bitget may expect quote size; we pass base size here and let caller override if needed.
        return client.place_market_order(
            symbol=symbol,
            side=side,
            size=qty,
            client_order_id=client_order_id,
        )
    if isinstance(client, BybitClient):
        return client.place_market_order(
            symbol=symbol,
            side=side,
            qty=qty,
            reduce_only=reduce_only,
            client_order_id=client_order_id,
        )
    if isinstance(client, CoinbaseExchangeClient):
        return client.place_market_order(symbol=symbol, side=side, size=qty, client_order_id=client_order_id)
    if isinstance(client, KrakenClient):
        return client.place_market_order(symbol=symbol, side=side, size=qty, client_order_id=client_order_id)
    if isinstance(client, KucoinSpotClient):
        # KuCoin market BUY often requires quote funds; this simplified path does not convert.
        return client.place_market_order(symbol=symbol, side=side, size=qty, client_order_id=client_order_id, quote_size=False)
    if isinstance(client, KucoinFuturesClient):
        return client.place_market_order(symbol=symbol, side=side, size=qty, reduce_only=reduce_only, client_order_id=client_order_id)
    if isinstance(client, GateSpotClient):
        return client.place_market_order(symbol=symbol, side=side, size=qty, client_order_id=client_order_id)
    if isinstance(client, GateUsdtFuturesClient):
        return client.place_market_order(symbol=symbol, side=side, size=qty, reduce_only=reduce_only, client_order_id=client_order_id)
    if isinstance(client, BitfinexClient):
        return client.place_market_order(symbol=symbol, side=side, size=qty, client_order_id=client_order_id)
    if isinstance(client, BitfinexDerivativesClient):
        return client.place_market_order(symbol=symbol, side=side, size=qty, client_order_id=client_order_id)
    if isinstance(client, KrakenFuturesClient):
        return client.place_market_order(symbol=symbol, side=side, size=qty, reduce_only=reduce_only, client_order_id=client_order_id)

    # Check for IBKR client (lazy import to avoid circular dependency)
    global IBKRClient
    if IBKRClient is None:
        try:
            from app.services.ibkr_trading import IBKRClient as _IBKRClient
            IBKRClient = _IBKRClient
        except ImportError:
            pass

    if IBKRClient is not None and isinstance(client, IBKRClient):
        return _place_ibkr_order(
            client=client,
            signal_type=signal_type,
            symbol=symbol,
            amount=qty,
            exchange_config=exchange_config,
        )

    # Check for MT5 client (lazy import to avoid circular dependency)
    global MT5Client
    if MT5Client is None:
        try:
            from app.services.mt5_trading import MT5Client as _MT5Client
            MT5Client = _MT5Client
        except ImportError:
            pass

    if MT5Client is not None and isinstance(client, MT5Client):
        return _place_mt5_order(
            client=client,
            signal_type=signal_type,
            symbol=symbol,
            amount=qty,
            exchange_config=exchange_config,
        )

    raise LiveTradingError(f"Unsupported client type: {type(client)}")


def _place_ibkr_order(
    client,
    *,
    signal_type: str,
    symbol: str,
    amount: float,
    exchange_config: Optional[Dict[str, Any]] = None,
) -> LiveOrderResult:
    """
    Place order via IBKR for US stocks.

    Signal mapping for stocks (no short selling in this implementation):
    - open_long / add_long -> BUY
    - close_long / reduce_long -> SELL
    - open_short / close_short -> Not supported (raises error)
    """
    sig = (signal_type or "").strip().lower()

    # Stock trading: no short selling support in basic implementation
    if "short" in sig:
        raise LiveTradingError("IBKR stock trading does not support short signals in this implementation")

    # Determine action
    if sig in ("open_long", "add_long"):
        action = "buy"
    elif sig in ("close_long", "reduce_long"):
        action = "sell"
    else:
        raise LiveTradingError(f"Unsupported signal_type for IBKR: {signal_type}")

    # Get market type from config
    cfg = exchange_config if isinstance(exchange_config, dict) else {}
    market_type = str(cfg.get("market_type") or cfg.get("market_category") or "USStock").strip()

    # Place market order
    result = client.place_market_order(
        symbol=symbol,
        action=action,
        quantity=amount,
        market_type=market_type,
    )

    # Convert IBKRClient result to LiveOrderResult format
    return LiveOrderResult(
        success=result.success,
        exchange_order_id=str(result.order_id) if result.order_id else "",
        filled=result.filled,
        avg_price=result.avg_price,
        raw={
            "status": result.status,
            "message": result.message,
            "raw": result.raw,
        },
    )


def _place_mt5_order(
    client,
    *,
    signal_type: str,
    symbol: str,
    amount: float,
    exchange_config: Optional[Dict[str, Any]] = None,
) -> LiveOrderResult:
    """
    Place order via MT5 for forex trading.

    Signal mapping for forex:
    - open_long / add_long -> BUY
    - close_long / reduce_long -> SELL
    - open_short / add_short -> SELL
    - close_short / reduce_short -> BUY
    """
    sig = (signal_type or "").strip().lower()

    # Determine action based on signal
    if sig in ("open_long", "add_long"):
        action = "buy"
    elif sig in ("close_long", "reduce_long"):
        action = "sell"
    elif sig in ("open_short", "add_short"):
        action = "sell"
    elif sig in ("close_short", "reduce_short"):
        action = "buy"
    else:
        raise LiveTradingError(f"Unsupported signal_type for MT5: {signal_type}")

    # Place market order
    result = client.place_market_order(
        symbol=symbol,
        side=action,
        volume=amount,
        comment="QuantDinger",
    )

    # Convert MT5Client result to LiveOrderResult format
    return LiveOrderResult(
        success=result.success,
        exchange_order_id=str(result.order_id) if result.order_id else "",
        filled=result.filled,
        avg_price=result.price,
        raw={
            "status": result.status,
            "message": result.message,
            "deal_id": result.deal_id,
            "raw": result.raw,
        },
    )

