import functools
import logging
import threading
import time
import warnings


def log_decorator(func):
    def wrapper(*args, **kwargs):
        logging.info(f'Entering {func.__name__}')
        result = func(*args, **kwargs)
        logging.info(f'Exiting {func.__name__}')
        return result
    return wrapper

def error_decorator(func):
    def wrapper(*args, **kwargs):
        try:
            return func(*args, **kwargs)
        except Exception as e:
            logging.error(f'Error in {func.__name__}: {str(e)}')
            raise
    return wrapper

def timing_decorator(func):
    def wrapper(*args, **kwargs):
        start_time = time.time()
        result = func(*args, **kwargs)
        end_time = time.time()
        logging.info(f'{func.__name__} executed in {end_time - start_time} seconds')
        return result
    return wrapper

def retry_decorator(max_retries=5):
    def decorator(func):
        @functools.wraps(func)
        def wrapper(*args, **kwargs):
            for _ in range(max_retries):
                try:
                    return func(*args, **kwargs)
                except Exception as error:
                    logging.error(f" Error in {func.__name__}: {str(error)} Retrying ....")
            return func(*args, **kwargs)
        return wrapper
    return decorator
    
def singleton_decorator(cls):
    instances = {}
    def wrapper(*args, **kwargs):
        if cls not in instances:
            instances[cls] = cls(*args, **kwargs)
        return instances[cls]
    return wrapper

def synchronized_decorator(func):
    func.__lock__ = threading.Lock()
    def wrapper(*args, **kwargs):
        with func.__lock__:
            return func(*args, **kwargs)
    return wrapper


def deprecated_decorator(func):
    @functools.wraps(func)
    def wrapper(*args, **kwargs):
        warnings.warn(f"{func.__name__} is deprecated", category=DeprecationWarning)
        return func(*args, **kwargs)
    return wrapper

def validate_inputs_decorator(validator):
    def decorator(func):
        @functools.wraps(func)
        def wrapper(*args, **kwargs):
            if not validator(*args, **kwargs):
                raise ValueError("Invalid Inputs")
            return func(*args, **kwargs)
        return wrapper
    return decorator