import logging
import uuid
from datetime import datetime, timezone
import aiosmtplib
from email.message import EmailMessage
from icalendar import Calendar, Event, vCalAddress, vText
from app.config import settings

logger = logging.getLogger(__name__)

async def send_meeting_invite(
    participants: list[dict],
    title: str,
    description: str,
    start_time: datetime,
    end_time: datetime,
) -> bool:
    if not settings.smtp_host or not settings.smtp_user or not settings.smtp_password:
        logger.warning("SMTP credentials not configured. Skipping email invite.")
        return False

    # Create the ICS content
    cal = Calendar()
    cal.add('prodid', '-//Common Availability//m.com//')
    cal.add('version', '2.0')
    cal.add('method', 'REQUEST')

    event = Event()
    event.add('summary', title)
    event.add('dtstart', start_time)
    event.add('dtend', end_time)
    event.add('dtstamp', datetime.now(timezone.utc))
    event.add('description', description)
    event.add('uid', str(uuid.uuid4()))
    event.add('organizer', vCalAddress(f'MAILTO:{settings.smtp_user}'))

    attendee_emails = []
    for p in participants:
        attendee = vCalAddress(f'MAILTO:{p["email"]}')
        attendee.params['cn'] = vText(p["name"])
        attendee.params['ROLE'] = vText('REQ-PARTICIPANT')
        event.add('attendee', attendee, encode=0)
        attendee_emails.append(p["email"])

    cal.add_component(event)
    ics_data = cal.to_ical()

    # Create Email
    msg = EmailMessage()
    msg["Subject"] = f"Invitation: {title}"
    msg["From"] = settings.smtp_user
    msg["To"] = ", ".join(attendee_emails)
    msg.set_content(
        f"You have been invited to: {title}\n"
        f"When: {start_time.strftime('%Y-%m-%d %H:%M %Z')}\n\n"
        f"{description}"
    )

    # Attach ICS
    msg.add_attachment(
        ics_data,
        maintype="text",
        subtype="calendar",
        filename="invite.ics",
        params={"method": "REQUEST"}
    )

    # Send
    try:
        await aiosmtplib.send(
            msg,
            hostname=settings.smtp_host,
            port=settings.smtp_port,
            username=settings.smtp_user,
            password=settings.smtp_password,
            start_tls=True
        )
        logger.info(f"Sent meeting invites to {len(attendee_emails)} participants")
        return True
    except Exception as e:
        logger.error(f"Failed to send email invite: {e}")
        return False