#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
日志模块 - 按天生成独立日志文件
"""

import logging
import os
from datetime import datetime
from typing import Optional

BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
LOG_DIR = os.path.join(BASE_DIR, "logs")


def get_logger(name: str = "sync") -> logging.Logger:
    """
    获取日志记录器
    
    每次调用都检查日期，确保正确切换
    
    Args:
        name: 日志记录器名称
        
    Returns:
        日志记录器实例
    """
    today: str = datetime.now().strftime("%Y-%m-%d")
    
    # 不再缓存 logger，每次都重新创建，避免日期切换问题
    logger: logging.Logger = logging.getLogger(name)
    logger.setLevel(logging.INFO)
    logger.propagate = False
    
    # 清除所有 handlers
    logger.handlers.clear()
    
    os.makedirs(LOG_DIR, exist_ok=True)
    
    # 按天生成日志文件：sync-2026-03-05.log
    log_file: str = os.path.join(LOG_DIR, f"{name}-{today}.log")
    
    # 文件处理器
    try:
        file_handler: logging.FileHandler = logging.FileHandler(
            log_file, encoding="utf-8"
        )
    except OSError as e:
        raise RuntimeError(f"无法创建日志文件 {log_file}: {e}") from e
        
    file_handler.setLevel(logging.INFO)
    
    # 控制台处理器
    console_handler: logging.StreamHandler = logging.StreamHandler()
    console_handler.setLevel(logging.INFO)
    
    # 格式化器
    formatter: logging.Formatter = logging.Formatter(
        "%(asctime)s - %(name)s - %(levelname)s - %(message)s",
        datefmt="%Y-%m-%d %H:%M:%S"
    )
    file_handler.setFormatter(formatter)
    console_handler.setFormatter(formatter)
    
    logger.addHandler(file_handler)
    logger.addHandler(console_handler)
    
    return logger


def clean_old_logs(days: int = 30) -> int:
    """
    清理超过指定天数的旧日志文件
    
    Args:
        days: 保留天数
        
    Returns:
        删除的文件数量
    """
    deleted_count: int = 0
    
    try:
        if not os.path.exists(LOG_DIR):
            return 0
        
        now: datetime = datetime.now()
        
        for filename in os.listdir(LOG_DIR):
            if not filename.endswith(".log"):
                continue
                
            filepath: str = os.path.join(LOG_DIR, filename)
            
            try:
                file_mtime: datetime = datetime.fromtimestamp(
                    os.path.getmtime(filepath)
                )
                file_age: int = (now - file_mtime).days
                
                if file_age > days:
                    os.remove(filepath)
                    deleted_count += 1
                    print(f"已删除旧日志: {filename}")
            except OSError as e:
                print(f"删除日志文件失败 {filename}: {e}")
                
    except Exception as e:
        print(f"清理日志失败: {e}")
        
    return deleted_count