#!/usr/bin/env python3
"""
日志管理模块
"""

import os
import datetime
import json
from typing import List, Dict, Optional

class LogLevel:
    DEBUG = "debug"
    INFO = "info"
    WARNING = "warning"
    ERROR = "error"
    SUCCESS = "success"

class LogEntry:
    """日志条目"""
    def __init__(self, level: str, message: str, timestamp: datetime.datetime = None):
        self.level = level
        self.message = message
        self.timestamp = timestamp or datetime.datetime.now()
    
    def to_dict(self) -> Dict:
        """转换为字典"""
        return {
            "level": self.level,
            "message": self.message,
            "timestamp": self.timestamp.isoformat()
        }
    
    @classmethod
    def from_dict(cls, data: Dict) -> 'LogEntry':
        """从字典创建"""
        return cls(
            level=data["level"],
            message=data["message"],
            timestamp=datetime.datetime.fromisoformat(data["timestamp"])
        )

class Logger:
    """日志管理器"""
    def __init__(self, log_dir: str = "logs"):
        self.log_dir = log_dir
        self.logs: List[LogEntry] = []
        self.max_memory_logs = 1000  # 内存中保留的最大日志数
        self.current_filter = "all"  # all, error, error_warning, no_debug, debug
        
        # 确保日志目录存在
        os.makedirs(self.log_dir, exist_ok=True)
    
    def log(self, message: str, level: str = LogLevel.INFO):
        """记录日志"""
        entry = LogEntry(level, message)
        self.logs.append(entry)
        
        # 当日志超过阈值时，保存到文件
        if len(self.logs) > self.max_memory_logs:
            self.save_to_file()
        
        return entry
    
    def debug(self, message: str):
        """记录debug日志"""
        return self.log(message, LogLevel.DEBUG)
    
    def info(self, message: str):
        """记录info日志"""
        return self.log(message, LogLevel.INFO)
    
    def warning(self, message: str):
        """记录warning日志"""
        return self.log(message, LogLevel.WARNING)
    
    def error(self, message: str):
        """记录error日志"""
        return self.log(message, LogLevel.ERROR)
    
    def success(self, message: str):
        """记录success日志"""
        return self.log(message, LogLevel.SUCCESS)
    
    def save_to_file(self) -> str:
        """保存日志到文件"""
        timestamp = datetime.datetime.now().strftime("%Y%m%d_%H%M%S")
        filename = os.path.join(self.log_dir, f"rdss_{timestamp}.log")
        
        with open(filename, 'w', encoding='utf-8') as f:
            for entry in self.logs:
                json.dump(entry.to_dict(), f, ensure_ascii=False)
                f.write('\n')
        
        # 清空内存中的日志
        self.logs = []
        return filename
    
    def load_from_file(self, filename: str) -> List[LogEntry]:
        """从文件加载日志"""
        entries = []
        try:
            with open(filename, 'r', encoding='utf-8') as f:
                for line in f:
                    line = line.strip()
                    if line:
                        data = json.loads(line)
                        entries.append(LogEntry.from_dict(data))
        except Exception as e:
            self.error(f"加载日志文件失败: {str(e)}")
        
        return entries
    
    def get_filtered_logs(self) -> List[LogEntry]:
        """获取过滤后的日志"""
        if self.current_filter == "all":
            return self.logs
        elif self.current_filter == "error":
            return [entry for entry in self.logs if entry.level == LogLevel.ERROR]
        elif self.current_filter == "error_warning":
            return [entry for entry in self.logs if entry.level in [LogLevel.ERROR, LogLevel.WARNING]]
        elif self.current_filter == "no_debug":
            return [entry for entry in self.logs if entry.level != LogLevel.DEBUG]
        elif self.current_filter == "debug":
            return [entry for entry in self.logs if entry.level == LogLevel.DEBUG]
        return self.logs
    
    def set_filter(self, filter_type: str):
        """设置过滤器"""
        self.current_filter = filter_type
    
    def clear(self):
        """清空日志"""
        self.logs = []
    
    def get_log_files(self) -> List[str]:
        """获取所有日志文件"""
        files = []
        if os.path.exists(self.log_dir):
            for file in os.listdir(self.log_dir):
                if file.startswith("rdss_") and file.endswith(".log"):
                    files.append(os.path.join(self.log_dir, file))
        # 按时间排序
        files.sort(reverse=True)
        return files

# 全局日志实例
global_logger = Logger()

def get_logger() -> Logger:
    """获取全局日志实例"""
    return global_logger