import os
import json
import logging
from datetime import datetime
from typing import Dict, Any, List, Optional
import csv


class GenerationLogger:
    def __init__(self, log_folder: str = "logs"):
        self.log_folder = log_folder
        if not os.path.exists(log_folder):
            os.makedirs(log_folder)
        
        # 初始化日志文件
        self.log_file = os.path.join(log_folder, "generation_log.json")
        self.csv_file = os.path.join(log_folder, "generation_log.csv")
        
        # 设置Python标准日志
        self.logger = logging.getLogger('generation_logger')
        self.logger.setLevel(logging.INFO)
        
        # 创建文件处理器
        if not self.logger.handlers:
            handler = logging.FileHandler(os.path.join(log_folder, 'generation.log'), encoding='utf-8')
            formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
            handler.setFormatter(formatter)
            self.logger.addHandler(handler)
        
        # 如果CSV文件不存在，创建并写入表头
        if not os.path.exists(self.csv_file):
            with open(self.csv_file, 'w', newline='', encoding='utf-8') as f:
                writer = csv.writer(f)
                writer.writerow([
                    'timestamp', 'query', 'generated_text', 'style', 
                    'total_score', 'relevance', 'accuracy', 'completeness', 'fluency',
                    'hallucination_keywords', 'hallucination_entities'
                ])
    
    def log_generation(self, query: str, generated_text: str, style: str, 
                      source_segments: List[Any], score: Optional[Dict[str, Any]] = None,
                      hallucination_warnings: Optional[Dict[str, List[Any]]] = None):
        """
        Log a generation event
        
        Args:
            query: The query used for generation
            generated_text: The generated text
            style: The style used for generation
            source_segments: The source segments used
            score: Optional score information
            hallucination_warnings: Optional hallucination warnings
        """
        # 记录到标准日志
        self.logger.info(f"Generation request: {query[:50]}...")
        
        # 创建日志条目
        log_entry = {
            "timestamp": datetime.now().isoformat(),
            "query": query,
            "generated_text": generated_text,
            "style": style,
            "source_segments_count": len(source_segments),
            "score": score,
            "hallucination_warnings": hallucination_warnings
        }
        
        # 写入JSON日志文件
        self._write_json_log(log_entry)
        
        # 写入CSV日志文件
        self._write_csv_log(log_entry)
    
    def _write_json_log(self, log_entry: Dict[str, Any]):
        """Write log entry to JSON file"""
        # 读取现有日志
        logs = []
        if os.path.exists(self.log_file):
            with open(self.log_file, 'r', encoding='utf-8') as f:
                try:
                    logs = json.load(f)
                except json.JSONDecodeError:
                    logs = []
        
        # 添加新日志条目
        logs.append(log_entry)
        
        # 写入文件
        with open(self.log_file, 'w', encoding='utf-8') as f:
            json.dump(logs, f, ensure_ascii=False, indent=2)
    
    def _write_csv_log(self, log_entry: Dict[str, Any]):
        """Write log entry to CSV file"""
        with open(self.csv_file, 'a', newline='', encoding='utf-8') as f:
            writer = csv.writer(f)
            writer.writerow([
                log_entry["timestamp"],
                log_entry["query"],
                log_entry["generated_text"],
                log_entry["style"],
                log_entry["score"].get("total_score", "") if log_entry["score"] else "",
                log_entry["score"].get("dimensions", {}).get("relevance", "") if log_entry["score"] else "",
                log_entry["score"].get("dimensions", {}).get("accuracy", "") if log_entry["score"] else "",
                log_entry["score"].get("dimensions", {}).get("completeness", "") if log_entry["score"] else "",
                log_entry["score"].get("dimensions", {}).get("fluency", "") if log_entry["score"] else "",
                ", ".join(log_entry["hallucination_warnings"].get("keywords", [])) if log_entry["hallucination_warnings"] else "",
                ", ".join(log_entry["hallucination_warnings"].get("entities", [])) if log_entry["hallucination_warnings"] else ""
            ])
    
    def get_logs(self, limit: int = 100) -> List[Dict[str, Any]]:
        """
        Get recent logs
        
        Args:
            limit: Maximum number of logs to return
            
        Returns:
            List of log entries
        """
        if not os.path.exists(self.log_file):
            return []
        
        with open(self.log_file, 'r', encoding='utf-8') as f:
            try:
                logs = json.load(f)
                # 返回最近的记录
                return logs[-limit:]
            except json.JSONDecodeError:
                return []
    
    def clear_logs(self):
        """Clear all logs"""
        if os.path.exists(self.log_file):
            os.remove(self.log_file)
        if os.path.exists(self.csv_file):
            os.remove(self.csv_file)
            
        # 清空标准日志
        for handler in self.logger.handlers:
            if isinstance(handler, logging.FileHandler):
                handler.stream.truncate(0)
            
        # 重新创建日志文件夹（如果不存在）
        if not os.path.exists(self.log_folder):
            os.makedirs(self.log_folder)
            
        # 重新创建JSON日志文件
        with open(self.log_file, 'w', encoding='utf-8') as f:
            json.dump([], f)
            
        # 重新创建CSV文件和表头
        with open(self.csv_file, 'w', newline='', encoding='utf-8') as f:
            writer = csv.writer(f)
            writer.writerow([
                'timestamp', 'query', 'generated_text', 'style', 
                'total_score', 'relevance', 'accuracy', 'completeness', 'fluency',
                'hallucination_keywords', 'hallucination_entities'
            ])

    def log_info(self, info_msg: str):
        """记录信息日志"""
        self.logger.info(info_msg)

# Create global logger instance
logger = GenerationLogger()