import re
import os
import requests
from smolagents import Tool
from smolagents.utils import truncate_content

# Define constant for API URL
DEFAULT_API_URL = "https://agents-course-unit4-scoring.hf.space"

class DownloadTaskAttachmentTool(Tool):
    """Tool for downloading files attached to tasks."""

    name = "download_file"
    description = "Downloads the file attached to the task ID"
    inputs = {'task_id': {'type': 'string', 'description': 'The task id to download attachment from.'}}
    output_type = "string"

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

    def forward(self, task_id: str) -> str:
        """Download a file associated with the given task ID."""
        file_url = f"{DEFAULT_API_URL}/files/{task_id}"
        local_file_path = f"downloads/{task_id}.file"

        try:
            # Create downloads directory if it doesn't exist
            os.makedirs("downloads", exist_ok=True)

            # Download the file
            with requests.get(file_url, stream=True, timeout=15) as response:
                response.raise_for_status()
                with open(local_file_path, "wb") as file:
                    for chunk in response.iter_content(chunk_size=8192):
                        file.write(chunk)

            return local_file_path

        except Exception as e:
            print(f"Error downloading file for task {task_id}: {e}")
            raise


class VisitWebpageTool(Tool):
    """Tool for visiting webpages and converting content to markdown."""

    name = "visit_webpage"
    description = "Visits a webpage and returns its content as markdown"
    inputs = {'url': {'type': 'string', 'description': 'The URL to visit'}}
    output_type = "string"

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

    def forward(self, url: str) -> str:
        """Visit a webpage and return its content as markdown."""
        try:
            # Import here to avoid dependency issues
            from markdownify import markdownify

            # Fetch webpage content
            response = requests.get(url, timeout=20)
            response.raise_for_status()

            # Convert HTML to markdown and clean up
            content = markdownify(response.text).strip()
            content = re.sub(r"\n{3,}", "\n\n", content)

            # Truncate to avoid excessively long responses
            return truncate_content(content, 10000)

        except requests.exceptions.Timeout:
            return "Request timed out. Please check the URL or try again later."
        except Exception as e:
            return f"Error: {str(e)}"