import math
from typing import Optional, Tuple

from smolagents import tool, DuckDuckGoSearchTool, VisitWebpageTool


search_tool = DuckDuckGoSearchTool()

@tool
def calculate_cargo_travel_time(
    origin_coords: Tuple[float, float],
    destination_coords: Tuple[float, float],
    cruising_speed_kmh: Optional[float] = 750.0,  # Average speed for cargo planes
) -> float:
    """
    Calculate the travel time for a cargo plane between two points on Earth using great-circle distance.

    Args:
        origin_coords: Tuple of (latitude, longitude) for the starting point
        destination_coords: Tuple of (latitude, longitude) for the destination
        cruising_speed_kmh: Optional cruising speed in km/h (defaults to 750 km/h for typical cargo planes)

    Returns:
        float: The estimated travel time in hours

    Example:
        >>> # Chicago (41.8781° N, 87.6298° W) to Sydney (33.8688° S, 151.2093° E)
        >>> result = calculate_cargo_travel_time((41.8781, -87.6298), (-33.8688, 151.2093))
    """

    def to_radians(degrees: float) -> float:
        return degrees * (math.pi / 180)

    # Extract coordinates
    lat1, lon1 = map(to_radians, origin_coords)
    lat2, lon2 = map(to_radians, destination_coords)

    # Earth's radius in kilometers
    EARTH_RADIUS_KM = 6371.0

    # Calculate great-circle distance using the haversine formula
    dlon = lon2 - lon1
    dlat = lat2 - lat1

    a = (
        math.sin(dlat / 2) ** 2
        + math.cos(lat1) * math.cos(lat2) * math.sin(dlon / 2) ** 2
    )
    c = 2 * math.asin(math.sqrt(a))
    distance = EARTH_RADIUS_KM * c

    # Add 10% to account for non-direct routes and air traffic controls
    actual_distance = distance * 1.1

    # Calculate flight time
    # Add 1 hour for takeoff and landing procedures
    flight_time = (actual_distance / cruising_speed_kmh) + 1.0

    # Format the results
    return round(flight_time, 2)


@tool
def visit_webpage(url: str) -> str:
    """Visits a webpage at the given URL and returns its content as a markdown string.

    Args:
        url: The URL of the webpage to visit.

    Returns:
        The content of the webpage converted to Markdown, or an error message if the request fails.
    """
    try:
        # Send a GET request to the URL
        response = requests.get(url)
        response.raise_for_status()  # Raise an exception for bad status codes

        # Convert the HTML content to Markdown
        markdown_content = markdownify(response.text).strip()

        # Remove multiple line breaks
        markdown_content = re.sub(r"\n{3,}", "\n\n", markdown_content)

        return markdown_content

    except RequestException as e:
        return f"Error fetching the webpage: {str(e)}"
    except Exception as e:
        return f"An unexpected error occurred: {str(e)}"