"""
YFinance数据源

获取港股、美股数据（通过SSH隧道）
"""

import os
import time
from typing import Optional
from datetime import datetime, timedelta
import pandas as pd
import urllib3

# 禁用SSL警告
urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)


class YFinanceSource:
    """YFinance数据源"""

    # 代码映射（项目代码 -> YFinance格式）
    CODE_MAP = {
        # 港股
        "HSTECH.HK": "3033.HK",    # 恒生科技指数
        "HSI": "^HSI",             # 恒生指数
        # 美股指数
        "NDX": "^NDX",             # 纳斯达克100
        "SPX": "^GSPC",            # 标普500
        "DJI": "^DJI",             # 道琼斯
        # 日本/欧洲
        "N225": "^N225",           # 日经225
        "GDAXI": "^GDAXI",         # 德国DAX
        # 商品
        "CL.NYM": "CL=F",          # WTI原油期货
    }

    def __init__(self, use_ssh_tunnel: bool = False):
        """
        初始化YFinance数据源
        
        Args:
            use_ssh_tunnel: 是否使用SSH隧道（需先启动SSHTunnelManager）
        """
        self.use_ssh_tunnel = use_ssh_tunnel
        self._delay = 0.5  # 请求延迟（避免限流）

    def fetch(self, code: str, start_date: str, end_date: str) -> Optional[pd.DataFrame]:
        """
        获取数据
        
        Args:
            code: 代码（如 'NDX', 'N225', 'HSI'）
            start_date: 开始日期 'YYYY-MM-DD'
            end_date: 结束日期 'YYYY-MM-DD'
        
        Returns:
            DataFrame with columns: date, open, high, low, close, volume
            股票元信息存储在 df.attrs['info'] 中
        """
        import yfinance as yf
        
        # 添加延迟避免限流
        time.sleep(self._delay)
        
        # 转换代码格式
        yf_code = self.CODE_MAP.get(code, code)
        
        try:
            ticker = yf.Ticker(yf_code)
            
            # 获取股票信息（仅对股票/ETF有效，指数可能没有）
            stock_info = {}
            try:
                stock_info = ticker.info or {}
            except Exception:
                pass  # 指数可能没有info
            
            # end_date 需要加一天（yfinance的end是排他的）
            end_dt = datetime.strptime(end_date, "%Y-%m-%d") + timedelta(days=1)
            
            # auto_adjust=False 获取不复权价格
            df = ticker.history(
                start=start_date,
                end=end_dt.strftime("%Y-%m-%d"),
                auto_adjust=False
            )
            
            if df is None or len(df) == 0:
                return None
            
            # 标准化列名
            df = df.rename(columns={
                "Open": "open",
                "High": "high",
                "Low": "low",
                "Close": "close",
                "Volume": "volume",
            })
            
            # 确保索引是日期格式
            df.index = pd.to_datetime(df.index, utc=True).tz_localize(None).normalize()
            df.index.name = "date"
            
            # 添加代码列
            df["code"] = code
            
            # 将股票信息存储到 DataFrame.attrs 中（最外层结构）
            df.attrs['info'] = stock_info
            df.attrs['code'] = code
            
            return df[['code', 'open', 'high', 'low', 'close', 'volume']]
            
        except Exception as e:
            print(f"YFinance下载 {code} ({yf_code}) 失败: {e}")
            return None

    def is_yfinance_code(self, code: str) -> bool:
        """判断是否需要YFinance获取"""
        # 非A股代码
        china_suffixes = ['.SH', '.SZ', '.SS', '.CSI']
        futures_suffixes = ['.SHF', '.NYM', '.DCE', '.CZC']
        
        # A股或期货用Tushare，其他用YFinance
        return not any(code.endswith(s) for s in china_suffixes + futures_suffixes)