from typing import Any, Optional
from smolagents.tools import Tool
import requests
import markdownify
import smolagents
import re  # Add re import here

class VisitWebpageTool(Tool):
    name = "visit_webpage"
    description = "Visits a webpage at the given url and reads its content as a markdown string. Use this to browse webpages."
    inputs = {'url': {'type': 'string', 'description': 'The url of the webpage to visit.'}}
    output_type = "string"

    def forward(self, url: str) -> str:
        try:
            import requests
            from markdownify import markdownify
            from requests.exceptions import RequestException
            from bs4 import BeautifulSoup
            from smolagents.utils import truncate_content
        except ImportError as e:
            raise ImportError(
                "You must install packages `markdownify`, `requests`, and `beautifulsoup4` to run this tool: run `pip install markdownify requests beautifulsoup4`."
            ) from e
        try:
            headers = {
                'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36'
            }
            
            response = requests.get(url, timeout=20, headers=headers)
            response.raise_for_status()

            # Parse HTML and extract main content
            soup = BeautifulSoup(response.text, 'html.parser')
            
            # Remove unwanted elements
            for element in soup(['script', 'style', 'nav', 'footer', 'iframe', 'header']):
                element.decompose()
            
            # Get main content (prioritize article or main tags)
            main_content = soup.find('article') or soup.find('main') or soup.find('body')
            
            if main_content:
                # Convert only the main content to markdown
                markdown_content = markdownify(str(main_content)).strip()
            else:
                markdown_content = markdownify(response.text).strip()

            # Remove multiple line breaks and limit content
            markdown_content = re.sub(r"\n{3,}", "\n\n", markdown_content)
            
            # Limit content to ~4000 words (roughly 5000 tokens)
            return truncate_content(markdown_content, 4000)

        except requests.exceptions.Timeout:
            return "The request timed out. Please try again later or check the URL."
        except RequestException as e:
            return f"Error fetching the webpage: {str(e)}"
        except Exception as e:
            return f"An unexpected error occurred: {str(e)}"

    def __init__(self, *args, **kwargs):
        self.is_initialized = False