from flask import Blueprint, request, redirect, url_for, session, jsonify, render_template
from extensions import db
from models import Order, User
from services.alipay_service import AlipayService
import uuid
from datetime import datetime
import logging

logger = logging.getLogger(__name__)

payment_bp = Blueprint('payment', __name__, url_prefix='/payment')

# 积分价格配置
POINTS_PACKAGES = {
    '50': {'points': 50, 'amount': 5.00},
    '200': {'points': 200, 'amount': 20.00},
    '1000': {'points': 1000, 'amount': 100.00},
    '5000': {'points': 5000, 'amount': 500.00},
}

@payment_bp.route('/create', methods=['POST'])
def create_payment():
    if 'user_id' not in session:
        return jsonify({'code': 401, 'msg': '请先登录'}), 401
    
    package_id = request.form.get('package_id')
    if package_id not in POINTS_PACKAGES:
        return jsonify({'code': 400, 'msg': '无效的套餐'}), 400
    
    package = POINTS_PACKAGES[package_id]
    user_id = session['user_id']
    
    # 生成唯一订单号 (时间戳 + 随机位)
    out_trade_no = datetime.now().strftime('%Y%m%d%H%M%S') + str(uuid.uuid4().hex[:6])
    
    # 创建订单记录
    try:
        order = Order(
            out_trade_no=out_trade_no,
            user_id=user_id,
            amount=package['amount'],
            points=package['points'],
            status='PENDING'
        )
        db.session.add(order)
        db.session.commit()
    except Exception as e:
        db.session.rollback()
        return f"订单创建失败: {str(e)}", 500
    
    # 获取支付链接
    try:
        alipay_service = AlipayService()
        pay_url = alipay_service.create_order_url(
            out_trade_no=out_trade_no,
            total_amount=package['amount'],
            subject=f"购买{package['points']}积分"
        )
        return redirect(pay_url)
    except Exception as e:
        return f"支付链接生成失败: {str(e)}", 500

@payment_bp.route('/return')
def payment_return():
    """支付成功后的同步跳转页面"""
    try:
        logger.info(f"收到支付宝同步回调，参数: {dict(request.args)}")
        
        data = request.args.to_dict()
        signature = data.get("sign")
        
        if not signature:
            logger.error("同步回调缺少签名参数")
            return "参数错误：缺少签名", 400
        
        alipay_service = AlipayService()
        # 直接传递原始字典，由 verify_notify 处理
        success = alipay_service.verify_notify(data, signature)
        
        out_trade_no = data.get('out_trade_no')
        order = Order.query.filter_by(out_trade_no=out_trade_no).first()
        
        if success:
            logger.info(f"同步回调验证成功，订单号: {out_trade_no}")
            # 同步通知仅用于页面展示，实际业务逻辑在异步通知 notify 中处理
            return render_template('buy.html', success=True, order=order)
        else:
            logger.error(f"同步回调验证失败，订单号: {out_trade_no}")
            return "支付验证失败", 400
            
    except Exception as e:
        logger.error(f"处理同步回调时发生异常: {str(e)}", exc_info=True)
        return f"处理支付回调失败: {str(e)}", 500

@payment_bp.route('/notify', methods=['POST'])
def payment_notify():
    """支付宝异步通知"""
    try:
        logger.info(f"收到支付宝异步通知，参数: {request.form.to_dict()}")
        
        data = request.form.to_dict()
        signature = data.get("sign")  # 不要pop，保留原始数据
        
        if not signature:
            logger.error("异步通知缺少签名参数")
            return "fail"
        
        alipay_service = AlipayService()
        success = alipay_service.verify_notify(data, signature)
        
        if success and data.get('trade_status') in ['TRADE_SUCCESS', 'TRADE_FINISHED']:
            out_trade_no = data.get('out_trade_no')
            trade_no = data.get('trade_no')
            
            logger.info(f"异步通知验证成功，订单号: {out_trade_no}, 支付宝交易号: {trade_no}")
            
            order = Order.query.filter_by(out_trade_no=out_trade_no).first()
            if order and order.status == 'PENDING':
                order.status = 'PAID'
                order.trade_no = trade_no
                order.paid_at = datetime.utcnow()
                
                # 给用户加积分
                user = User.query.get(order.user_id)
                if user:
                    user.points += order.points
                    logger.info(f"用户 {user.id} 充值 {order.points} 积分")
                
                db.session.commit()
                logger.info(f"订单 {out_trade_no} 处理成功")
                return "success"
            elif order:
                logger.warning(f"订单 {out_trade_no} 状态为 {order.status}，跳过处理")
                return "success"  # 已处理过的订单也返回success
            else:
                logger.error(f"未找到订单: {out_trade_no}")
                return "fail"
        else:
            logger.error(f"异步通知验证失败或交易状态异常: {data.get('trade_status')}")
            return "fail"
            
    except Exception as e:
        logger.error(f"处理异步通知时发生异常: {str(e)}", exc_info=True)
        db.session.rollback()
        return "fail"