email.py

import os
from sendgrid import SendGridAPIClient
from sendgrid.helpers.mail import Mail

def send_invitation_email(to_email, sender, campaign, message):
    sg = SendGridAPIClient(os.environ.get('SENDGRID_API_KEY'))
    
    html_content = f"""
    <h2>Join {sender.username}'s Business Campaign</h2>
    <p>{message}</p>
    <p>Campaign: {campaign.title}</p>
    <p>Target: ${campaign.target_amount}</p>
    <a href="{campaign.invite_link}">Support this campaign</a>
    """
    
    message = Mail(
        from_email='noreply@startup-crowdfund.com',
        to_emails=to_email,
        subject=f'{sender.username} invited you to support their business',
        html_content=html_content
    )
    
    try:
        sg.send(message)
        return True
    except Exception as e:
        print(f"SendGrid error: {e}")
        return False