"""
Tushare数据源

获取A股指数、ETF、期货数据
"""

import os
from typing import Optional
from datetime import datetime
import pandas as pd


class TushareSource:
    """Tushare数据源"""

    def __init__(self, token: Optional[str] = None):
        """
        初始化Tushare数据源
        
        Args:
            token: Tushare Token（可选，默认从环境变量读取）
        """
        self._token = token or os.getenv("TUSHARE_TOKEN")
        if not self._token:
            raise ValueError("请设置环境变量 TUSHARE_TOKEN")

    def _get_pro_api(self):
        """获取Tushare Pro API"""
        import tushare as ts
        return ts.pro_api(self._token)

    def _clear_proxy(self) -> dict:
        """清除代理环境变量（Tushare是国内服务，不需要代理）"""
        original = {}
        for key in ["HTTP_PROXY", "HTTPS_PROXY", "ALL_PROXY", "http_proxy", "https_proxy", "all_proxy"]:
            original[key] = os.environ.pop(key, None)
        return original

    def _restore_proxy(self, original: dict):
        """恢复代理环境变量"""
        for key, value in original.items():
            if value is not None:
                os.environ[key] = value

    def fetch_index(self, code: str, start_date: str, end_date: str) -> Optional[pd.DataFrame]:
        """
        获取A股指数数据
        
        Args:
            code: 指数代码，如 '000300.SH', '399006.SZ', 'H30269.CSI'
            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
        """
        original_proxy = self._clear_proxy()
        
        try:
            pro = self._get_pro_api()
            
            # 转换代码格式 (.SS -> .SH)
            ts_code = code.replace(".SS", ".SH")
            
            df = pro.index_daily(
                ts_code=ts_code,
                start_date=start_date.replace("-", ""),
                end_date=end_date.replace("-", "")
            )
            
            if df is None or len(df) == 0:
                return None
            
            # 标准化列名
            df = df.rename(columns={
                "trade_date": "date",
                "vol": "volume",
            })
            
            # 转换日期格式
            df["date"] = pd.to_datetime(df["date"])
            df = df.set_index("date")
            df = df.sort_index()
            df["code"] = code
            
            return df[['code', 'open', 'high', 'low', 'close', 'volume']]
            
        except Exception as e:
            print(f"Tushare下载指数 {code} 失败: {e}")
            return None
            
        finally:
            self._restore_proxy(original_proxy)

    def fetch_futures(self, code: str, start_date: str, end_date: str) -> Optional[pd.DataFrame]:
        """
        获取期货数据
        
        Args:
            code: 期货代码，如 'AU.SHF', 'CU.SHF'
            start_date: 开始日期
            end_date: 结束日期
        """
        original_proxy = self._clear_proxy()
        
        try:
            import tushare as ts
            pro = self._get_pro_api()
            
            # 使用 fut_daily 接口
            df = pro.fut_daily(
                ts_code=code,
                start_date=start_date.replace("-", ""),
                end_date=end_date.replace("-", "")
            )
            
            if df is None or len(df) == 0:
                return None
            
            # 标准化列名
            df = df.rename(columns={
                "trade_date": "date",
                "vol": "volume",
            })
            
            df["date"] = pd.to_datetime(df["date"])
            df = df.set_index("date")
            df = df.sort_index()
            df["code"] = code
            
            return df[['code', 'open', 'high', 'low', 'close', 'volume']]
            
        except Exception as e:
            print(f"Tushare下载期货 {code} 失败: {e}")
            return None
            
        finally:
            self._restore_proxy(original_proxy)

    def fetch_etf(self, code: str, start_date: str, end_date: str) -> Optional[pd.DataFrame]:
        """
        获取ETF价格数据
        
        Args:
            code: ETF代码，如 '159915.SZ', '518880.SH'
        """
        original_proxy = self._clear_proxy()
        
        try:
            pro = self._get_pro_api()
            
            ts_code = code.replace(".SS", ".SH")
            
            df = pro.fund_daily(
                ts_code=ts_code,
                start_date=start_date.replace("-", ""),
                end_date=end_date.replace("-", "")
            )
            
            if df is None or len(df) == 0:
                return None
            
            df = df.rename(columns={
                "trade_date": "date",
                "vol": "volume",
            })
            
            df["date"] = pd.to_datetime(df["date"])
            df = df.set_index("date")
            df = df.sort_index()
            df["code"] = code
            
            return df[['code', 'open', 'high', 'low', 'close', 'volume']]
            
        except Exception as e:
            print(f"Tushare下载ETF {code} 失败: {e}")
            return None
            
        finally:
            self._restore_proxy(original_proxy)

    def fetch_etf_nav(self, code: str, start_date: str, end_date: str) -> Optional[pd.DataFrame]:
        """
        获取ETF净值数据
        
        Args:
            code: ETF代码
        """
        original_proxy = self._clear_proxy()
        
        try:
            pro = self._get_pro_api()
            
            ts_code = code.replace(".SS", ".SH")
            
            df = pro.fund_nav(
                ts_code=ts_code,
                start_date=start_date.replace("-", ""),
                end_date=end_date.replace("-", "")
            )
            
            if df is None or len(df) == 0:
                return None
            
            df = df.rename(columns={
                "nav_date": "date",
                "unit_nav": "nav",
            })
            
            df["date"] = pd.to_datetime(df["date"])
            df = df.set_index("date")
            df = df.sort_index()
            df["code"] = code
            
            return df[['code', 'nav']]
            
        except Exception as e:
            print(f"Tushare下载ETF净值 {code} 失败: {e}")
            return None
            
        finally:
            self._restore_proxy(original_proxy)

    def is_china_index(self, code: str) -> bool:
        """判断是否为A股指数"""
        return code.endswith(".SH") or code.endswith(".SZ") or code.endswith(".SS") or code.endswith(".CSI")

    def is_futures(self, code: str) -> bool:
        """判断是否为期货"""
        return ".SHF" in code or ".NYM" in code or ".DCE" in code or ".CZC" in code

    def fetch(self, code: str, start_date: str, end_date: str) -> Optional[pd.DataFrame]:
        """
        通用数据获取（自动判断类型）
        
        Args:
            code: 代码
            start_date: 开始日期
            end_date: 结束日期
        """
        if self.is_china_index(code):
            return self.fetch_index(code, start_date, end_date)
        elif self.is_futures(code):
            return self.fetch_futures(code, start_date, end_date)
        else:
            return None