import pandas as pd
from sqlalchemy import create_engine, exc, text
import re
from core.utils import get_current_date_time
import core.logger as logging
from core.utils import transform_data_type

logger = logging.logger


class DBAStockData:
    def __init__(
        self,
        db_url: str,
    ):
        self.db_url = db_url
        self.db_engine = create_engine(
            self.db_url,
            pool_size=25,  # 连接池大小
            max_overflow=10,  # 允许的最大溢出连接
            pool_timeout=30,  # 连接超时时间（秒）
            pool_recycle=60,  # 连接回收时间（秒），避免长时间闲置
        )

    def query_data(self, sql: str, condition_dict: dict, return_multi: bool = True):
        """
        查询数据
        :param sql: 查询SQL
        :param db_url: 数据库连接URL
        """
        try:
            with self.db_engine.connect() as conn:
                result = conn.execute(text(sql), condition_dict)
                if return_multi:
                    result = result.fetchall()
                    if result:
                        result_list = [
                            transform_data_type(dict(row._mapping)) for row in result
                        ]
                        return result_list
                    else:
                        return None
                else:
                    result = result.fetchone()
                    if result:
                        result_dict = transform_data_type(dict(result._mapping))
                        return result_dict
                    else:
                        return None
        except Exception as e:
            logger.error(f"查询数据出错: {e}")
            return None

    def query_market_data_by_symbol_bar(
        self,
        symbol: str,
        bar: str,
        fields: list = None,
        start: str = None,
        end: str = None,
        table_name: str = "index_daily_price_from_2021",
    ):
        """
        根据交易对和K线周期查询数据
        :param symbol: 交易对
        :param bar: K线周期
        :param fields: 字段列表
        :param start: 开始时间
        :param end: 结束时间
        """
        if fields is None:
            fields = ["*"]
        fields_str = ", ".join(fields)
        if table_name is None:
            table_name = "index_daily_price_from_2021"
            join_table = "all_index"
        if table_name.startswith("index"):
            join_table = "all_index"
        else:
            join_table = "all_stock"

        if start is None and end is None:
            sql = f"""
                SELECT {fields_str} FROM {table_name} a
                INNER JOIN {join_table} b ON a.ts_code = b.ts_code
                WHERE a.ts_code = :symbol
                ORDER BY a.trade_date ASC
                """
            condition_dict = {"symbol": symbol}
        else:
            if start is not None and end is not None:
                start = start.replace("-", "")
                end = end.replace("-", "")
                if start > end:
                    start, end = end, start
                sql = f"""
                    SELECT {fields_str} FROM {table_name} a
                    INNER JOIN {join_table} b ON a.ts_code = b.ts_code
                    WHERE a.ts_code = :symbol AND a.trade_date BETWEEN :start AND :end
                    ORDER BY a.trade_date ASC
                    """
                condition_dict = {
                    "symbol": symbol,
                    "start": start,
                    "end": end,
                }
            elif start is not None:
                start = start.replace("-", "")
                sql = f"""
                    SELECT {fields_str} FROM {table_name} a
                    INNER JOIN {join_table} b ON a.ts_code = b.ts_code
                    WHERE a.ts_code = :symbol AND a.trade_date >= :start
                    ORDER BY a.trade_date ASC
                    """
                condition_dict = {"symbol": symbol, "start": start}
            elif end is not None:
                end = end.replace("-", "")
                sql = f"""
                    SELECT {fields_str} FROM {table_name} a
                    INNER JOIN {join_table} b ON a.ts_code = b.ts_code
                    WHERE a.ts_code = :symbol AND a.trade_date <= :end
                    ORDER BY a.trade_date ASC
                    """
                condition_dict = {"symbol": symbol, "end": end}
        return self.query_data(sql, condition_dict, return_multi=True)