app.py

import os
import requests
import logging
from fastapi import FastAPI, HTTPException, BackgroundTasks
from fastapi.responses import JSONResponse
from dotenv import load_dotenv

# Load environment variables from .env file
load_dotenv()

# Set up logging configuration
logging.basicConfig(level=logging.DEBUG, format='%(asctime)s - %(levelname)s - %(message)s')

# Initialize FastAPI app
app = FastAPI(
    servers=[
        {
            "url": "https://leekwoon-email-api.hf.space",
        }
    ],
)

def send_email_via_mailgun(to_email: str, subject: str, body: str):
    mailgun_api_key = os.getenv("MAILGUN_API_KEY")
    mailgun_domain = os.getenv("MAILGUN_DOMAIN_NAME")
    from_email = os.getenv("FROM_EMAIL")

    request_url = f"https://api.mailgun.net/v3/{mailgun_domain}/messages"
    
    try:
        response = requests.post(
            request_url,
            auth=("api", mailgun_api_key),
            data={
                "from": from_email,
                "to": [to_email],
                "subject": subject,
                "text": body
            }
        )
        response.raise_for_status()
        logging.debug(f"Email successfully sent to {to_email} via Mailgun")

    except requests.exceptions.RequestException as e:
        logging.error(f"Failed to send email to {to_email} via Mailgun: {str(e)}")
        raise HTTPException(status_code=500, detail="Failed to send email via Mailgun")

@app.post("/send-chat-email")
def send_chat_email(chat_content: str, to_email: str, background_tasks: BackgroundTasks):
    """
    Sends an email with the provided chat content to the specified email address.
    
    Args:
        chat_content (str): The content of the chat to be sent.
        to_email (str): The email address to send the chat content to.
    
    Returns:
        JSONResponse: A response indicating the email sending status.
    """
    try:
        # Email subject and body
        email_subject = "Chat Transcript"
        email_body = f"{chat_content}"

        # Schedule the email to be sent in the background
        background_tasks.add_task(send_email_via_mailgun, to_email, email_subject, email_body)

        # Respond to the client immediately with an acceptance message
        return JSONResponse(status_code=202, content={"message": "The email is being sent."})

    except Exception as e:
        # Raise an HTTP 500 error if something goes wrong
        raise HTTPException(status_code=500, detail=str(e))