from django.conf import settings
from django.core.mail import EmailMessage, EmailMultiAlternatives
from django.template import loader

import mdformat
from markdownify import markdownify

from membershipworks.models import EventInvoice


def make_multipart_email(
    subject: str, html_body: str, to: tuple[str]
) -> EmailMultiAlternatives:
    plain_body = mdformat.text(markdownify(html_body), extensions={"tables"})

    email = EmailMultiAlternatives(
        subject,
        plain_body,
        from_email="CMS Invoices <invoices@claremontmakerspace.org>",
        to=to,
        reply_to=["Claremont MakerSpace <Info@ClaremontMakerSpace.org>"],
    )

    email.attach_alternative(html_body, "text/html")
    return email


def make_instructor_email(
    invoice: EventInvoice, pdf: bytes, event_url: str
) -> EmailMessage:
    if invoice.event.instructor is None or invoice.event.instructor.member is None:
        raise ValueError("Event Instructor not defined or is not member")
    template = loader.get_template(
        "membershipworks/email/event_invoice_instructor.dj.html"
    )
    html_body = template.render({"invoice": invoice, "event_url": event_url})

    message = make_multipart_email(
        f'Your CMS instructor invoice has been received for event "{invoice.event}" {invoice.event.start} - {invoice.event.end}',
        html_body,
        (invoice.event.instructor.member.sanitized_mailbox(),),
    )
    message.attach(f"CMS_event_invoice_{invoice.uuid}.pdf", pdf, "application/pdf")
    return message


def make_admin_email(invoice: EventInvoice, pdf: bytes, event_url: str) -> EmailMessage:
    template = loader.get_template("membershipworks/email/event_invoice_admin.dj.html")
    html_body = template.render({"invoice": invoice, "event_url": event_url})

    message = make_multipart_email(
        f'CMS instructor invoice created for event "{invoice.event}" {invoice.event.start} - {invoice.event.end}',
        html_body,
        # TODO: should this be in database instead?
        settings.INVOICE_HANDLERS,
    )
    message.attach(f"CMS_event_invoice_{invoice.uuid}.pdf", pdf, "application/pdf")
    return message


def make_invoice_emails(
    invoice: EventInvoice, pdf: bytes, event_url: str
) -> list[EmailMessage]:
    return [
        make_instructor_email(invoice, pdf, event_url),
        make_admin_email(invoice, pdf, event_url),
    ]