import os
import requests
from dotenv import load_dotenv

load_dotenv()


def caption_from_url(image_url):
    """
    Generates a caption for an image using the Azure Computer Vision API.

    Parameters:
    image_url (str): The URL of the image for which a caption should be generated.

    Returns:
    str: The generated caption for the image.

    Raises:
    requests.exceptions.HTTPError: If the request to the Azure API fails.
    """

    subscription_key = os.getenv('AZURE_SUBSCRIPTION_KEY')
    endpoint = 'https://icmvp.cognitiveservices.azure.com/'

    analyze_url = endpoint + "computervision/imageanalysis:analyze?api-version=2023-10-01"

    headers = {
        "Content-Type": "application/json",
        'Ocp-Apim-Subscription-Key': subscription_key
    }
    params = {
        'features': 'caption'
    }
    data = {'url': image_url}
    response = requests.post(analyze_url, headers=headers, params=params, json=data)
    response.raise_for_status()

    analysis = response.json()

    # Extract the description from the returned JSON
    description = analysis['captionResult']['text']

    return description