"""
核心交易操作相关的API端点 (买入、卖出、撤单)。
"""
from flask import Blueprint, request, jsonify, abort

from core.app_state import get_trader, get_real_trader_manager, is_real_mode, logger
from base_trader import BaseTrader
from trade_constants import ORDER_TYPE_LIMIT, ORDER_DIRECTION_BUY, ORDER_DIRECTION_SELL

trading_bp = Blueprint('trading_routes', __name__, url_prefix='/yu')

@trading_bp.route("/buy", methods=["POST"])
def buy():
    """处理买入请求。"""
    logger.info("Received buy request")
    data = request.get_json()
    if not data:
        logger.error("Buy request with no JSON data")
        abort(400, description="Request body must be JSON.")

    code = data.get("code")
    price_str = data.get("price")
    amount_str = data.get("amount")
    strategy_name = data.get("strategy_name", "default_strategy")
    order_type = data.get("order_type", ORDER_TYPE_LIMIT)

    try:
        if not all([code, price_str, amount_str]):
            logger.warning(f"Buy request missing parameters: code={code}, price={price_str}, amount={amount_str}")
            raise ValueError("Missing required parameters: code, price, amount")

        price = float(price_str)
        amount = int(float(amount_str))

        if order_type == ORDER_TYPE_LIMIT and (price <= 0 or amount <= 0):
            logger.warning(f"Buy request with invalid price/amount: price={price}, amount={amount}")
            raise ValueError("For limit orders, price and amount must be positive")

        trader = get_trader()
        if not trader:
            logger.error("Trader instance not available for buy request.")
            return jsonify({"success": False, "error": "Trader not available"}), 503

        if is_real_mode():
            if not BaseTrader.is_trading_time():
                logger.warning(f"Buy attempt outside trading hours: {code}, {price}, {amount}")
                return jsonify({"success": False, "error": "交易失败: 非交易时间不能实盘交易"}), 400
            
            if not trader.is_available():
                logger.error(f"Trader not available for real mode buy: {trader.connection_error_message}")
                return jsonify({"success": False, "error": trader.connection_error_message or "交易系统连接失败"}), 503
            
            rtm = get_real_trader_manager()
            if not rtm:
                logger.error("RealTraderManager not available for buy request.")
                return jsonify({"success": False, "error": "RealTraderManager not available"}), 503
            
            logger.info(f"Using RealTraderManager for buy: {code}, {price}, {amount}, {strategy_name}")
            result = rtm.place_order(strategy_name, code, ORDER_DIRECTION_BUY, amount, price, order_type)
        else:
            result = trader.buy(code, price, amount, strategy_name)

        if result.get("success"):
            logger.info(f"买入下单成功: {result}")
            return jsonify({"success": True, "order_id": result.get("order_id")}), 200
        else:
            logger.error(f"买入下单失败: {result}")
            return jsonify({"success": False, "error": result.get("error", "Unknown error placing buy order")}), 400

    except ValueError as e:
        logger.error(f"Invalid buy request parameters: {str(e)}")
        abort(400, description=str(e))
    except Exception as e:
        logger.error(f"Error processing buy request: {str(e)}", exc_info=True)
        abort(500, description="Internal server error during buy request")

@trading_bp.route("/sell", methods=["POST"])
def sell():
    """处理卖出请求。"""
    logger.info("Received sell request")
    data = request.get_json()
    if not data:
        logger.error("Sell request with no JSON data")
        abort(400, description="Request body must be JSON.")

    code = data.get("code")
    price_str = data.get("price")
    amount_str = data.get("amount")
    strategy_name = data.get("strategy_name", "default_strategy") 
    order_type = data.get("order_type", ORDER_TYPE_LIMIT)

    try:
        if not all([code, price_str, amount_str]):
            logger.warning(f"Sell request missing parameters: code={code}, price={price_str}, amount={amount_str}")
            raise ValueError("Missing required parameters: code, price, amount")

        price = float(price_str)
        amount = int(float(amount_str))

        if order_type == ORDER_TYPE_LIMIT and (price <= 0 or amount <= 0):
            logger.warning(f"Sell request with invalid price/amount: price={price}, amount={amount}")
            raise ValueError("For limit orders, price and amount must be positive")

        trader = get_trader()
        if not trader:
            logger.error("Trader instance not available for sell request.")
            return jsonify({"success": False, "error": "Trader not available"}), 503

        if is_real_mode():
            if not BaseTrader.is_trading_time():
                logger.warning(f"Sell attempt outside trading hours: {code}, {price}, {amount}")
                return jsonify({"success": False, "error": "交易失败: 非交易时间不能实盘交易"}), 400
            
            if not trader.is_available():
                logger.error(f"Trader not available for real mode sell: {trader.connection_error_message}")
                return jsonify({"success": False, "error": trader.connection_error_message or "交易系统连接失败"}), 503

            rtm = get_real_trader_manager()
            if not rtm:
                logger.error("RealTraderManager not available for sell request.")
                return jsonify({"success": False, "error": "RealTraderManager not available"}), 503

            logger.info(f"Using RealTraderManager for sell: {code}, {price}, {amount}, {strategy_name}")
            result = rtm.place_order(strategy_name, code, ORDER_DIRECTION_SELL, amount, price, order_type)
        else:
            result = trader.sell(code, price, amount, strategy_name)

        if result.get("success"):
            logger.info(f"卖出下单成功: {result}")
            return jsonify({"success": True, "order_id": result.get("order_id")}), 200
        else:
            logger.error(f"卖出下单失败: {result}")
            return jsonify({"success": False, "error": result.get("error", "Unknown error placing sell order")}), 400

    except ValueError as e:
        logger.error(f"Invalid sell request parameters: {str(e)}")
        abort(400, description=str(e))
    except Exception as e:
        logger.error(f"Error processing sell request: {str(e)}", exc_info=True)
        abort(500, description="Internal server error during sell request")

@trading_bp.route("/cancel/<order_id>", methods=["DELETE"])
def cancel(order_id: str):
    """根据订单ID处理撤单请求。"""
    logger.info(f"Received cancel request for order {order_id}")

    try:
        trader = get_trader()
        if not trader:
            logger.error("Trader instance not available for cancel request.")
            return jsonify({"success": False, "error": "Trader not available"}), 503
        
        if is_real_mode() and not trader.is_available():
            logger.error(f"Trader not available for real mode cancel: {trader.connection_error_message}")
            return jsonify({"success": False, "error": trader.connection_error_message or "交易系统连接失败"}), 503

        result = trader.cancel(order_id)
        logger.info(f"撤单结果: {result}")
        
        # 假设 cancel 操作总是返回一个字典，即使失败也包含状态
        if isinstance(result, dict) and result.get("success") is False:
             return jsonify(result), 400 # Propagate error from trader if structured
        
        return jsonify(result), 200

    except Exception as e:
        logger.error(f"Error processing cancel request for order {order_id}: {str(e)}", exc_info=True)
        abort(500, description=f"Internal server error during cancel request for order {order_id}")