import smtplib
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from email.mime.image import MIMEImage
from email.utils import formataddr
from pathlib import Path
from flask import current_app, render_template


def send_invitation(guest, event_name="Корпоратив", additional_text=""):
    """Отправляет приглашение гостю на email с QR-кодом во вложении."""
    config = current_app.config

    msg = MIMEMultipart("related")
    msg["Subject"] = f"Приглашение на мероприятие: {event_name}"
    msg["From"] = formataddr(("InviteMe", config.get("MAIL_DEFAULT_SENDER", config["MAIL_USERNAME"])))
    msg["To"] = guest.email

    # HTML-шаблон письма
    html_body = render_template(
        "email/invitation.html",
        guest=guest,
        event_name=event_name,
        additional_text=additional_text,
        qr_cid="qr_code_image",
    )

    msg.attach(MIMEText(html_body, "html", "utf-8"))

    # Прикрепляем QR-код
    qr_path = Path(config["QR_FOLDER"]) / guest.qr_filename
    if qr_path.exists():
        with open(qr_path, "rb") as img_file:
            img = MIMEImage(img_file.read())
            img.add_header("Content-ID", "<qr_code_image>")
            img.add_header("Content-Disposition", "inline", filename=guest.qr_filename)
            msg.attach(img)

    # Отправка через SMTP
    server = config["MAIL_SERVER"]
    port = config["MAIL_PORT"]
    username = config["MAIL_USERNAME"]
    password = config["MAIL_PASSWORD"]
    use_ssl = config.get("MAIL_USE_SSL", True)

    if not username or not password:
        raise ValueError("MAIL_USERNAME и MAIL_PASSWORD должны быть указаны в конфигурации")

    if use_ssl:
        with smtplib.SMTP_SSL(server, port) as smtp:
            smtp.login(username, password)
            smtp.send_message(msg)
    else:
        with smtplib.SMTP(server, port) as smtp:
            smtp.starttls()
            smtp.login(username, password)
            smtp.send_message(msg)

    guest.invitation_sent = True
    return True