import logging
import os
from datetime import datetime
from logging.handlers import RotatingFileHandler
from extensions import redis_client
import json

# 创建日志目录
LOG_DIR = os.path.join(os.path.dirname(os.path.dirname(__file__)), 'logs')
os.makedirs(LOG_DIR, exist_ok=True)

class SystemLogger:
    def __init__(self):
        self.logger = logging.getLogger('vision_ai')
        self.logger.setLevel(logging.INFO)
        
        # 文件处理器 (自动轮转，最大10MB，保留5个备份)
        file_handler = RotatingFileHandler(
            os.path.join(LOG_DIR, 'system.log'),
            maxBytes=10*1024*1024,
            backupCount=5,
            encoding='utf-8'
        )
        file_handler.setLevel(logging.INFO)
        
        # 控制台处理器
        console_handler = logging.StreamHandler()
        console_handler.setLevel(logging.INFO)
        
        # 格式化
        formatter = logging.Formatter(
            '[%(asctime)s] %(levelname)s - %(message)s',
            datefmt='%Y-%m-%d %H:%M:%S'
        )
        file_handler.setFormatter(formatter)
        console_handler.setFormatter(formatter)
        
        self.logger.addHandler(file_handler)
        self.logger.addHandler(console_handler)
    
    def _push_to_redis(self, level, message, extra=None):
        """推送到 Redis 并保留 30 天数据"""
        try:
            now = datetime.now()
            log_entry = {
                "time": now.strftime('%Y-%m-%d %H:%M:%S'),
                "level": level,
                "message": message,
                "extra": extra or {}
            }
            # 使用有序集合 (ZSET)，分数为时间戳，方便按时间清理
            timestamp = now.timestamp()
            redis_client.zadd('system_logs_zset', {json.dumps(log_entry, ensure_ascii=False): timestamp})
            
            # 清理 30 天之前的日志 (30 * 24 * 3600 秒)
            thirty_days_ago = timestamp - (30 * 24 * 3600)
            redis_client.zremrangebyscore('system_logs_zset', 0, thirty_days_ago)
        except:
            pass
    
    def info(self, message, **kwargs):
        self.logger.info(message)
        self._push_to_redis('INFO', message, kwargs)
    
    def warning(self, message, **kwargs):
        self.logger.warning(message)
        self._push_to_redis('WARNING', message, kwargs)
    
    def error(self, message, **kwargs):
        self.logger.error(message)
        self._push_to_redis('ERROR', message, kwargs)
    
    def debug(self, message, **kwargs):
        self.logger.debug(message)
        self._push_to_redis('DEBUG', message, kwargs)

# 全局日志实例
system_logger = SystemLogger()