import logging
import os
import json
import socket

class JsonFormatter(logging.Formatter):
    def format(self, record):
        log_record = {
            'timestamp': self.formatTime(record, self.datefmt),
            'level': record.levelname,
            'message': record.getMessage(),
            'name': record.name,
            'filename': record.filename,
            'funcName': record.funcName,
            'lineno': record.lineno,
            'pathname': record.pathname,
            'hostname': socket.gethostname()
        }
        # Merging additional fields from record
        if hasattr(record, 'extra'):
            log_record.update(record.extra)
            
        return json.dumps(log_record)

def setup_logger(name):
    logger = logging.getLogger(name)
    logger.setLevel(os.getenv('LOG_LEVEL', logging.INFO))

    # Console Handler
    console_handler = logging.StreamHandler()
    console_handler.setLevel(logging.DEBUG)
    
    # Formatter
    formatter = JsonFormatter()
    console_handler.setFormatter(formatter)

    # Adding handler to the logger
    if not logger.hasHandlers():
        logger.addHandler(console_handler)

    return logger