from flask import current_app, render_template
from flask_mailman import EmailMessage
from itsdangerous import URLSafeTimedSerializer

from common.utils.nginx_utils import prefixed_url_for





def confirm_token(token, expiration=3600):
    serializer = URLSafeTimedSerializer(current_app.config['SECRET_KEY'])
    try:
        email = serializer.loads(token, salt=current_app.config['SECURITY_PASSWORD_SALT'], max_age=expiration)
    except Exception as e:
        current_app.logger.debug(f'Error confirming token: {e}')
        raise
    return email


def send_email(to, subject, template):
    msg = EmailMessage(subject=subject,
                       body=template,
                       to=[to])
    msg.content_subtype = "html"
    msg.send()


def generate_reset_token(email):
    serializer = URLSafeTimedSerializer(current_app.config['SECRET_KEY'])
    return serializer.dumps(email, salt=current_app.config['SECURITY_PASSWORD_SALT'])


def generate_confirmation_token(email):
    serializer = URLSafeTimedSerializer(current_app.config['SECRET_KEY'])
    return serializer.dumps(email, salt=current_app.config['SECURITY_PASSWORD_SALT'])


def send_confirmation_email(user):
    current_app.logger.debug(f'Sending confirmation email to {user.email}')
    token = generate_confirmation_token(user.email)
    confirm_url = prefixed_url_for('security_bp.confirm_email', token=token, _external=True)
    current_app.logger.debug(f'Confirmation URL: {confirm_url}')
    html = render_template('email/activate.html', confirm_url=confirm_url)
    send_email(user.email, "Confirm your email", html)


def send_reset_email(user):
    token = generate_reset_token(user.email)
    reset_url = prefixed_url_for('security_bp.reset_password', token=token, _external=True)
    html = render_template('email/reset_password.html', reset_url=reset_url)
    send_email(user.email, "Reset Your Password", html)