import logging
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText

import aiosmtplib

from app.config import settings

logger = logging.getLogger(__name__)


async def send_email(to: str, subject: str, html_body: str) -> bool:
    """Send HTML email via SMTP. Returns True on success."""
    if not settings.smtp_host:
        logger.info(f"SMTP not configured, skipping email to {to}: {subject}")
        return False

    msg = MIMEMultipart("alternative")
    msg["From"] = f"{settings.smtp_from_name} <{settings.smtp_from_email}>"
    msg["To"] = to
    msg["Subject"] = subject
    msg.attach(MIMEText(html_body, "html"))

    try:
        await aiosmtplib.send(
            msg,
            hostname=settings.smtp_host,
            port=settings.smtp_port,
            username=settings.smtp_user,
            password=settings.smtp_password,
            use_tls=True,
        )
        return True
    except Exception as e:
        logger.error(f"Failed to send email to {to}: {e}")
        return False


async def send_registration_notification(
    admin_email: str, student_name: str, class_name: str
):
    html = f"""
    <h2>New Registration Pending Approval</h2>
    <p><strong>{student_name}</strong> has registered for <strong>{class_name}</strong>.</p>
    <p>Please log in to ClassHub to review and approve.</p>
    """
    await send_email(admin_email, "ClassHub: New Registration", html)


async def send_approval_notification(student_email: str, approved: bool):
    status_text = "approved" if approved else "rejected"
    html = f"""
    <h2>Registration {status_text.capitalize()}</h2>
    <p>Your registration has been <strong>{status_text}</strong>.</p>
    {"<p>You can now log in to ClassHub.</p>" if approved else ""}
    """
    await send_email(
        student_email, f"ClassHub: Registration {status_text.capitalize()}", html
    )