# utils/otp_utils.py
import random
from django.utils import timezone
from datetime import timedelta
from django.conf import settings
from django.core.mail import EmailMultiAlternatives
from django.template.loader import render_to_string
from django.utils.html import strip_tags

def generate_otp():
    return str(random.randint(100000, 999999))

def send_otp_via_email(email, otp, user_name=None, context='registration'):
    try:
        context_data = {
            'user_name': user_name or 'User',
            'otp': otp,
            'expiry_minutes': 10,
            'company_name': 'Attune Heart Therapy',
            'support_email': 'hello@attunehearttherapy.com',
            'current_year': timezone.now().year,
            'email_context': context
        }
        
        if context == 'password_reset':
            template_name = 'emails/password_reset_otp.html'
            subject = 'Password Reset Request - Verification Code'
        else:
            template_name = 'emails/otp_verification.html'
            subject = 'Your Verification Code - Secure Your Account'
        
        html_content = render_to_string(template_name, context_data)
        
        text_content = strip_tags(html_content)
        
        from_email = settings.DEFAULT_FROM_EMAIL
        to_email = [email]
        
        email_msg = EmailMultiAlternatives(
            subject,
            text_content,
            from_email,
            to_email
        )
        email_msg.attach_alternative(html_content, "text/html")
        email_msg.send()
        
        return True
        
    except Exception as e:
        print(f"Error sending email OTP: {e}")
        return False

def is_otp_expired(otp_expiry):
    if otp_expiry and timezone.now() < otp_expiry:
        return False
    return True