import logging
import sys
import time
from typing import Optional
from functools import wraps

def setup_logging(level: str = "INFO", log_file: Optional[str] = None):
    """Setup logging configuration for A2A agents."""
    
    formatter = logging.Formatter(
        '%(asctime)s - %(name)s - %(levelname)s - %(message)s'
    )
    
    # Console handler
    console_handler = logging.StreamHandler(sys.stdout)
    console_handler.setFormatter(formatter)
    
    # Root logger
    logger = logging.getLogger()
    logger.setLevel(getattr(logging, level.upper()))
    logger.addHandler(console_handler)
    
    # File handler if specified
    if log_file:
        file_handler = logging.FileHandler(log_file)
        file_handler.setFormatter(formatter)
        logger.addHandler(file_handler)
    
    return logger

def log_performance(func):
    """Decorator to log function performance."""
    @wraps(func)
    async def wrapper(*args, **kwargs):
        logger = logging.getLogger(func.__module__)
        start_time = time.time()
        logger.info(f"Starting {func.__name__}")
        
        try:
            result = await func(*args, **kwargs)
            duration = time.time() - start_time
            logger.info(f"Completed {func.__name__} in {duration:.2f}s")
            return result
        except Exception as e:
            duration = time.time() - start_time
            logger.error(f"Failed {func.__name__} after {duration:.2f}s: {e}")
            raise
    
    return wrapper