"""Binance exchange implementation for OpenClaw trading system.

This module provides a BinanceExchange class that implements the Exchange
interface for Binance cryptocurrency exchange (both spot and futures).
"""

import asyncio
import hashlib
import hmac
import time
from datetime import datetime
from typing import Any, Dict, List, Optional

from openclaw.exchange.base import (
    Exchange,
    ExchangeError,
    AuthenticationError,
    InsufficientFundsError,
    InvalidOrderError,
)
from openclaw.exchange.models import (
    Balance,
    Order,
    OrderSide,
    OrderStatus,
    OrderType,
    Position,
    Ticker,
)
from openclaw.utils.logging import get_logger


class BinanceExchange(Exchange):
    """Binance exchange implementation.

    Supports both simulated (paper trading) and live trading modes.
    In simulated mode, it uses the mock implementation internally.
    In live mode, it connects to Binance API.

    Args:
        api_key: Binance API key (required for live mode)
        api_secret: Binance API secret (required for live mode)
        is_simulated: Whether to use simulated/paper trading
        testnet: Whether to use Binance testnet
        base_url: Custom API base URL
    """

    # API Endpoints
    SPOT_BASE_URL = "https://api.binance.com"
    FUTURES_BASE_URL = "https://fapi.binance.com"
    TESTNET_SPOT_URL = "https://testnet.binance.vision"
    TESTNET_FUTURES_URL = "https://testnet.binancefuture.com"

    def __init__(
        self,
        api_key: Optional[str] = None,
        api_secret: Optional[str] = None,
        is_simulated: bool = True,
        testnet: bool = False,
        base_url: Optional[str] = None,
    ):
        super().__init__(name="binance", is_simulated=is_simulated)
        self.logger = get_logger("exchange.binance")

        self.api_key = api_key
        self.api_secret = api_secret
        self.testnet = testnet

        # Set base URL
        if base_url:
            self.base_url = base_url
        elif testnet:
            self.base_url = self.TESTNET_SPOT_URL
        else:
            self.base_url = self.SPOT_BASE_URL

        # In simulated mode, use internal mock
        if is_simulated:
            from openclaw.exchange.mock import MockExchange
            self._mock = MockExchange(name="binance_simulated")
            self.logger.info("BinanceExchange initialized in SIMULATED mode")
        else:
            self._mock = None
            if not api_key or not api_secret:
                raise AuthenticationError("API key and secret required for live trading")
            self.logger.info("BinanceExchange initialized in LIVE mode")

        # Internal state
        self._order_cache: Dict[str, Order] = {}
        self._request_timeout = 30.0

    def _generate_signature(self, query_string: str) -> str:
        """Generate HMAC signature for API request."""
        if not self.api_secret:
            raise AuthenticationError("API secret not configured")
        return hmac.new(
            self.api_secret.encode("utf-8"),
            query_string.encode("utf-8"),
            hashlib.sha256,
        ).hexdigest()

    def _get_headers(self) -> Dict[str, str]:
        """Get API request headers."""
        headers = {
            "Content-Type": "application/json",
        }
        if self.api_key:
            headers["X-MBX-APIKEY"] = self.api_key
        return headers

    def _map_binance_status(self, status: str) -> OrderStatus:
        """Map Binance order status to internal status."""
        status_map = {
            "NEW": OrderStatus.OPEN,
            "PARTIALLY_FILLED": OrderStatus.PARTIALLY_FILLED,
            "FILLED": OrderStatus.FILLED,
            "CANCELED": OrderStatus.CANCELLED,
            "PENDING_CANCEL": OrderStatus.PENDING,
            "REJECTED": OrderStatus.REJECTED,
            "EXPIRED": OrderStatus.EXPIRED,
        }
        return status_map.get(status, OrderStatus.PENDING)

    def _map_binance_side(self, side: str) -> OrderSide:
        """Map Binance side string to OrderSide."""
        return OrderSide.BUY if side == "BUY" else OrderSide.SELL

    async def connect(self) -> bool:
        """Connect to Binance API."""
        if self.is_simulated:
            return await self._mock.connect()

        # Live mode: verify API connectivity by fetching account info
        try:
            # Note: This is a placeholder for actual API call
            # In production, implement actual HTTP request
            await self._check_api_connection()
            self._connected = True
            self.logger.info("Connected to Binance API")
            return True
        except Exception as e:
            raise AuthenticationError(f"Failed to connect to Binance: {e}")

    async def disconnect(self) -> None:
        """Disconnect from Binance API."""
        if self.is_simulated and self._mock:
            await self._mock.disconnect()
        self._connected = False
        self.logger.info("Disconnected from Binance")

    async def _check_api_connection(self) -> None:
        """Check API connectivity (placeholder for actual implementation)."""
        # This would make an actual HTTP request in production
        # For now, just validate credentials exist
        if not self.api_key or not self.api_secret:
            raise AuthenticationError("API credentials not configured")

    async def place_order(
        self,
        symbol: str,
        side: OrderSide,
        amount: float,
        price: Optional[float] = None,
        order_type: str = "market",
    ) -> Order:
        """Place an order on Binance."""
        if self.is_simulated and self._mock:
            return await self._mock.place_order(symbol, side, amount, price, order_type)

        # Live mode implementation placeholder
        # In production, this would:
        # 1. Build order parameters
        # 2. Sign the request
        # 3. Send POST to /api/v3/order
        # 4. Parse response and return Order object

        self.logger.info(
            f"Live order: {side.value} {amount} {symbol} "
            f"@ {price or 'market'} ({order_type})"
        )

        # Placeholder: simulate order creation
        order_id = f"binance_{int(time.time() * 1000)}"
        order = Order(
            order_id=order_id,
            symbol=symbol.upper(),
            side=side,
            order_type=OrderType(order_type),
            amount=amount,
            price=price,
            status=OrderStatus.PENDING,
            exchange_id=order_id,
        )
        self._order_cache[order_id] = order
        return order

    async def cancel_order(self, order_id: str) -> bool:
        """Cancel an order on Binance."""
        if self.is_simulated and self._mock:
            return await self._mock.cancel_order(order_id)

        # Live mode implementation placeholder
        self.logger.info(f"Cancelling order: {order_id}")

        if order_id in self._order_cache:
            self._order_cache[order_id].status = OrderStatus.CANCELLED
            return True
        return False

    async def get_order(self, order_id: str) -> Optional[Order]:
        """Get order details from Binance."""
        if self.is_simulated and self._mock:
            return await self._mock.get_order(order_id)

        # Check cache first
        if order_id in self._order_cache:
            return self._order_cache[order_id]

        return None

    async def get_open_orders(self, symbol: Optional[str] = None) -> List[Order]:
        """Get open orders from Binance."""
        if self.is_simulated and self._mock:
            return await self._mock.get_open_orders(symbol)

        # Live mode: would query /api/v3/openOrders
        return [
            order for order in self._order_cache.values()
            if order.status in (OrderStatus.PENDING, OrderStatus.OPEN, OrderStatus.PARTIALLY_FILLED)
        ]

    async def get_balance(self, asset: Optional[str] = None) -> List[Balance]:
        """Get account balance from Binance."""
        if self.is_simulated and self._mock:
            return await self._mock.get_balance(asset)

        # Live mode: would query /api/v3/account
        # Placeholder implementation
        return [Balance(asset="USDT", free=10000.0, locked=0.0)]

    async def get_positions(self, symbol: Optional[str] = None) -> List[Position]:
        """Get current positions.

        Note: Binance spot doesn't have positions in the traditional sense,
        but we can infer positions from balances.
        """
        if self.is_simulated and self._mock:
            return await self._mock.get_positions(symbol)

        # For spot trading, positions are derived from non-zero balances
        balances = await self.get_balance()
        positions = []

        for balance in balances:
            if balance.asset != "USDT" and balance.total > 0:
                # Try to get current price
                try:
                    ticker = await self.get_ticker(f"{balance.asset}/USDT")
                    positions.append(
                        Position(
                            symbol=f"{balance.asset}/USDT",
                            side=OrderSide.BUY,
                            amount=balance.total,
                            entry_price=ticker.last,  # Approximation
                            current_price=ticker.last,
                        )
                    )
                except ExchangeError:
                    pass

        if symbol:
            symbol_upper = symbol.upper()
            positions = [p for p in positions if p.symbol == symbol_upper]

        return positions

    async def get_ticker(self, symbol: str) -> Ticker:
        """Get market ticker from Binance."""
        if self.is_simulated and self._mock:
            return await self._mock.get_ticker(symbol)

        # Live mode: would query /api/v3/ticker/bookTicker
        # Placeholder implementation
        return Ticker(
            symbol=symbol.upper(),
            bid=65000.0,
            ask=65100.0,
            last=65050.0,
            high=66000.0,
            low=64000.0,
            volume=1000000.0,
        )

    async def get_exchange_info(self) -> Dict[str, Any]:
        """Get exchange information (symbols, limits, etc.).

        This is a Binance-specific method that provides information about
        trading rules and symbol specifications.

        Returns:
            Dictionary with exchange information
        """
        # Would query /api/v3/exchangeInfo
        return {
            "timezone": "UTC",
            "serverTime": int(time.time() * 1000),
            "symbols": [],  # Would be populated with actual data
        }

    async def get_klines(
        self,
        symbol: str,
        interval: str = "1h",
        limit: int = 100,
    ) -> List[Dict[str, Any]]:
        """Get kline/candlestick data.

        Args:
            symbol: Trading symbol
            interval: Kline interval (1m, 5m, 1h, 1d, etc.)
            limit: Number of candles to retrieve

        Returns:
            List of kline data dictionaries
        """
        # Would query /api/v3/klines
        return []
