import logging
import logging.handlers
import os
from pathlib import Path
from typing import Optional

from app.config import settings


class LoggerManager:
    """日志管理器"""
    
    _loggers = {}
    _initialized = False
    
    @classmethod
    def setup_logging(cls):
        """设置日志系统"""
        if cls._initialized:
            return
        
        # 创建日志目录
        log_dir = Path(settings.log_file).parent
        log_dir.mkdir(parents=True, exist_ok=True)
        
        # 配置根日志器
        root_logger = logging.getLogger()
        root_logger.setLevel(getattr(logging, settings.log_level.upper()))
        
        # 清除现有处理器
        root_logger.handlers.clear()
        
        # 创建控制台处理器
        console_handler = logging.StreamHandler()
        console_handler.setLevel(getattr(logging, settings.log_level.upper()))
        
        # 控制台使用普通格式化器
        console_formatter = logging.Formatter(
            fmt=settings.log_format,
            datefmt=settings.log_date_format
        )
        console_handler.setFormatter(console_formatter)
        
        # 创建文件处理器（按时间轮转）
        file_handler = logging.handlers.TimedRotatingFileHandler(
            filename=settings.log_file,
            when='midnight',  # 每天午夜轮转
            interval=1,       # 每天一次
            backupCount=settings.log_backup_count,
            encoding='utf-8',
        )
        # 创建后设置 suffix 属性
        file_handler.suffix = "%Y%m%d"  # 设置文件后缀格式，如 app.log.20231215
        file_handler.setLevel(settings.log_level)  # 文件记录所有级别
        
        # 文件使用普通格式化器
        file_formatter = logging.Formatter(
            fmt=settings.log_format,
            datefmt=settings.log_date_format
        )
        file_handler.setFormatter(file_formatter)
        
        # 添加处理器到根日志器
        root_logger.addHandler(console_handler)
        root_logger.addHandler(file_handler)
        
        # 设置第三方库的日志级别
        logging.getLogger("uvicorn").setLevel(logging.INFO)
        logging.getLogger("uvicorn.access").setLevel(logging.WARNING)
        logging.getLogger("sqlalchemy.engine").setLevel(logging.WARNING)
        logging.getLogger("httpx").setLevel(logging.WARNING)
        logging.getLogger("watchfiles").setLevel(logging.WARNING)
        
        cls._initialized = True
        
        # 记录日志系统启动
        logger = cls.get_logger("LoggerManager")
        logger.info("🚀 日志系统初始化完成")
        logger.info(f"📁 日志文件: {settings.log_file}")
        logger.info(f"📊 日志级别: {settings.log_level}")
    
    @classmethod
    def get_logger(cls, name: str) -> logging.Logger:
        """获取指定名称的日志器"""
        if not cls._initialized:
            cls.setup_logging()
        
        if name not in cls._loggers:
            cls._loggers[name] = logging.getLogger(name)
        
        return cls._loggers[name]


def get_logger(name: Optional[str] = None) -> logging.Logger:
    """获取日志器的便捷函数"""
    if name is None:
        # 自动获取调用者的模块名
        import inspect
        frame = inspect.currentframe().f_back
        name = frame.f_globals.get('__name__', 'unknown')
    
    return LoggerManager.get_logger(name)


# 预定义的日志器
app_logger = get_logger("app")
api_logger = get_logger("api")
db_logger = get_logger("database")
external_api_logger = get_logger("external_api")