from collections.abc import Sequence

import gradio as gr
import requests

from tdagent.constants import HttpContentType


def get_url_http_content(
    url: str,
    content_type: Sequence[HttpContentType] | None = None,
    timeout: int = 30,
) -> tuple[str, str]:
    """Get the content of a URL using an HTTP GET request.

    Args:
        url: The URL to fetch the content from.
        content_type: If given it should contain the expected
            content types in the response body. The server may
            not honor the requested content types.
        timeout: Request timeout in seconds. Defaults to 30.

    Returns:
        A pair of strings (content, error_message). If there is an
        error getting content from the URL the `content` will be
        empty and `error_message` will, usually, contain the error
        cause. Otherwise, `error_message` will be empty and the
        content will be filled with data fetched from the URL.
    """
    headers = {}

    if content_type:
        headers["Accept"] = ",".join(content_type)

    try:
        response = requests.get(
            url,
            headers=headers,
            timeout=timeout,
        )
    except requests.exceptions.MissingSchema as err:
        return "", str(err)

    try:
        response.raise_for_status()
    except requests.HTTPError as err:
        return "", str(err)

    return response.text, ""


gr_get_url_http_content = gr.Interface(
    fn=get_url_http_content,
    inputs=["text", "text"],
    outputs="text",
    title="Get the content of a URL using an HTTP GET request.",
    description=(
        "Get the content of a URL in one of the specified content types."
        " The server may not honor the content type and if it fails the"
        " reason should also be returned with the corresponding HTTP"
        " error code."
    ),
)