# Copyright (C) 2018-2020 by BDE ENS Paris-Saclay
# SPDX-License-Identifier: GPL-3.0-or-later

import os
import sys

from django.conf import settings
from django.core.mail import send_mail
from django.template.loader import render_to_string
from django.views.debug import ExceptionReporter


def send_mail_on_exception(request, **kwargs):
    """
    When an error occurs on the Note Kfet, a mail is automatically sent to the webmasters.
    """

    if settings.DEBUG:
        # Don't need to send a mail in debug mode, errors are already displayed in console and in the response view.
        return

    try:
        exc_info = sys.exc_info()
        exc_type = exc_info[0]
        exc = exc_info[1]
        tb = exc_info[2]
        reporter = ExceptionReporter(request=request, exc_type=exc_type, exc_value=exc, tb=tb)

        note_sender = os.getenv("NOTE_MAIL", "notekfet@example.com")
        webmaster = os.getenv("WEBMASTER_MAIL", "notekfet@example.com")

        message = render_to_string('scripts/mail-error500.txt', context={"error": reporter.get_traceback_text()})
        message_html = render_to_string('scripts/mail-error500.html', context={"error": reporter.get_traceback_html()})

        send_mail("Erreur dans la Note Kfet", message, note_sender, [webmaster], html_message=message_html)
    except BaseException as e:
        sys.stderr.write("Une erreur est survenue lors de l'envoi d'un mail, pour signaler une erreur.")
        raise e