import csv
from typing import List, Dict, Optional
from base import LogHelper, MySQLHelper, Config

class DataExporter:
    """数据导出器类，用于从数据库提取数据并导出到CSV文件"""
        
    def __init__(self, db_config: dict, logger_name: str = 'export'):
        """
        初始化数据导出器
        
        Args:
            db_config: 数据库配置字典
            logger_name: 日志记录器名称
        """
        self.db_config = db_config
        self.logger = LogHelper(logger_name=logger_name).setup()
        self.head_map = Config.ConfigInfo.HEADER_MAP
    
    def get_monthly_avg_data(self, table_name: str) -> Optional[List[Dict]]:
        """
        从数据库读取月度均值数据
        
        Args:
            table_name: 源数据表名
            
        Returns:
            List[Dict]: 查询结果数据集，失败返回None
        """
        try:
            with MySQLHelper(**self.db_config) as db:
                # 获取表结构信息
                columns = db.execute_query(f"""
                    SELECT COLUMN_NAME 
                    FROM INFORMATION_SCHEMA.COLUMNS 
                    WHERE TABLE_SCHEMA = %s AND TABLE_NAME = %s
                    ORDER BY ORDINAL_POSITION
                """, (self.db_config['database'], table_name))
                
                if not columns:
                    self.logger.error(f"表 {table_name} 不存在或没有列")
                    return None
                
                # 获取列名列表(排除id和update_time)
                field_names = [col['COLUMN_NAME'] for col in columns 
                             if col['COLUMN_NAME'] not in ('id', 'update_time')]
                
                # 查询数据, 按照 avg_all 字段倒叙排列
                data = db.execute_query(f"""
                    SELECT {', '.join(field_names)} 
                    FROM {table_name}
                    ORDER BY avg_all DESC
                """)
                
                if not data:
                    self.logger.error(f"表 {table_name} 中没有数据")
                    return None
                
                return data
                
        except Exception as e:
            self.logger.error(f"从数据库读取月度均值数据失败: {str(e)}")
            return None
    
    def get_float_share_data(self, table_name: str) -> Optional[List[Dict]]:
        """
        从conditionalselection表读取流通股本数据
        
        Args:
            table_name: 源数据表名
            
        Returns:
            List[Dict]: 查询结果数据集，失败返回None
        """
        try:
            with MySQLHelper(**self.db_config) as db:
                # 查询流通股本数据
                data = db.execute_query(f"""
                    SELECT stock_code, stock_name, float_share
                    FROM {table_name}
                    ORDER BY stock_code
                """)
                
                if not data:
                    self.logger.error(f"表 {table_name} 中没有流通股本数据")
                    return None
                
                return data
                
        except Exception as e:
            self.logger.error(f"从数据库读取流通股本数据失败: {str(e)}")
            return None
    
    def export_to_csv(self, data: List[Dict], output_file: str) -> bool:
        """
        将合并后的数据导出到CSV文件
        
        Args:
            data: 要导出的数据集
            output_file: 输出的CSV文件路径
            
        Returns:
            bool: 是否导出成功
        """
        if not data:
            self.logger.warning("没有数据可导出")
            return False
        
        try:
            # 获取字段名(使用第一个数据的键)
            field_names = list(data[0].keys())
            
            with open(output_file, mode='w', newline='', encoding='utf-8-sig') as csvfile:
                writer = csv.DictWriter(csvfile, fieldnames=field_names)
                
                # 写入中文表头
                writer.writerow({col: self.head_map.get(col, col) for col in field_names})
                
                # 写入数据
                writer.writerows(data)
                
            self.logger.info(f"成功导出 {len(data)} 条记录到CSV文件: {output_file}")
            return True
            
        except Exception as e:
            self.logger.error(f"导出到CSV失败: {str(e)}")
            return False
    
    def export_data(self, monthly_table: str, csv_file: str = None) -> bool:
        """
        导出合并后的数据到CSV
        
        Args:
            monthly_table: 月度均价表名
            csv_file: CSV输出路径(可选)
            
        Returns:
            bool: 是否导出成功
        """
        # 从数据库获取数据
        monthly_data = self.get_monthly_avg_data(monthly_table)
        if not monthly_data:
            self.logger.error("无法获取月度均价数据")
            return False
        
        # 读取港股通标记
        hk_inout_data = self.get_hk_inout()

        for item in monthly_data:
            stock_name = item.get('stock_code')[3:]
            if stock_name in hk_inout_data:
                item['in_out'] = 1
            else:
                item['in_out'] = 0

        # 导出结果
        file_path = 'data/' + csv_file if csv_file else None
        csv_success = True
        if csv_file:
            csv_success = self.export_to_csv(monthly_data, file_path)
        
        return csv_success
    
    def get_hk_inout(self) -> Optional[List[Dict]]:
        """
        从conditionalselection表读取流通股本数据
        
        Args:
            table_name: 源数据表名
            
        Returns:
            List[Dict]: 查询结果数据集，失败返回None
        """
        try:
            with MySQLHelper(**self.db_config) as db:
                # 查询流通股本数据
                data = db.execute_query(f"""
                    SELECT stock_code
                    FROM hk_stock_connect
                    WHERE in_out = '1'
                    ORDER BY stock_code
                """)
                
                if not data:
                    self.logger.error(f"获取数据失败")
                    return None
                
                return [
                    row['stock_code'] 
                    for row in data 
                        if row['stock_code']
                ]
                
        except Exception as e:
            self.logger.error(f"从数据库读取流通股本数据失败: {str(e)}")
            return None