import urllib.robotparser
import time
from urllib.parse import urlparse

class RobotsHandler:
    def __init__(self):
        self.parser = urllib.robotparser.RobotFileParser()
        self.cache = {}
        self.cache_timeout = 3600  # 1 hour

    def can_fetch(self, url: str, user_agent: str) -> bool:
        domain = urlparse(url).netloc
        current_time = time.time()

        # Check cache first
        if domain in self.cache:
            parser, timestamp = self.cache[domain]
            if current_time - timestamp < self.cache_timeout:
                return parser.can_fetch(user_agent, url)

        # Update cache
        self.parser.set_url(f"https://{domain}/robots.txt")
        try:
            self.parser.read()
            self.cache[domain] = (self.parser, current_time)
            return self.parser.can_fetch(user_agent, url)
        except:
            return True  # If robots.txt is unavailable, assume allowed