From f075216d64005e4d57b5fb2a04d68a4610503ed4 Mon Sep 17 00:00:00 2001
From: Gresille&Siffle <39056254+GresilleSiffle@users.noreply.github.com>
Date: Thu, 18 Jan 2024 11:30:48 +0100
Subject: [PATCH] [back] feat: (wip) add command notify_nocontrib_users

---
 .../commands/notify_nocontrib_users.py        | 78 +++++++++++++++++++
 .../templates/core/no_contrib_email/body.html |  9 +++
 .../core/no_contrib_email/subject.txt         |  0
 backend/settings/settings.py                  |  5 +-
 4 files changed, 91 insertions(+), 1 deletion(-)
 create mode 100644 backend/core/management/commands/notify_nocontrib_users.py
 create mode 100644 backend/core/templates/core/no_contrib_email/body.html
 create mode 100644 backend/core/templates/core/no_contrib_email/subject.txt

diff --git a/backend/core/management/commands/notify_nocontrib_users.py b/backend/core/management/commands/notify_nocontrib_users.py
new file mode 100644
index 0000000000..250e680415
--- /dev/null
+++ b/backend/core/management/commands/notify_nocontrib_users.py
@@ -0,0 +1,78 @@
+"""
+Notify active users who haven't contributed since their account was created.
+"""
+from datetime import datetime, timedelta
+from smtplib import SMTPException
+
+from django.core.mail import send_mail
+from django.core.management.base import BaseCommand, CommandError
+from django.db.models import Q, Count
+from django.template.loader import render_to_string
+from django.utils import timezone
+
+from core.models.user import User
+from tournesol.models import Comparison
+from settings import settings
+
+
+class Command(BaseCommand):
+    help = "Notify active users who haven't contributed since their account was created."
+
+    def handle(self, *args, **options):
+        self.stdout.write(f"start command: {__name__}")
+
+        from_email = settings.REST_REGISTRATION["VERIFICATION_FROM_EMAIL"]
+        no_contrib_period = settings.APP_CORE["MGMT_NO_CONTRIBUTION_REMINDER_PERIOD"]
+
+        creation_date = timezone.now() - no_contrib_period
+        # creation_date = datetime(2022, 8, 22)
+
+        # display the configuration if more verbosity is asked
+        if options.get("verbosity", 1) > 1:
+            self.stdout.write(f"MGMT_NO_CONTRIBUTION_REMINDER_PERIOD: {no_contrib_period.days}")
+
+        users = (
+            User.objects.filter(
+                is_active=True,
+                date_joined__date=creation_date.date(),
+            )
+            .annotate(
+                n_comparisons=Count(
+                    "comparisons",
+                    filter=Q(comparisons__datetime_add__date__gt=creation_date.date()),
+                )
+            )
+            .filter(n_comparisons=0)
+        )
+
+        html_message = render_to_string("core/no_contrib_email/body.html")
+
+        fails = []
+        successes = 0
+        for user in users:
+            try:
+                send_mail(
+                    subject="Subject here",
+                    message="Here is the message.",
+                    html_message=html_message,
+                    from_email=from_email,
+                    recipient_list=[user.email],
+                    fail_silently=False,
+                )
+            except SMTPException as ex:
+                fails.append((user.email, type(ex).__name__, ex))
+            else:
+                successes += 1
+
+        self.stdout.write(self.style.SUCCESS(f"users notified: {successes}"))
+
+        if len(fails):
+            self.stdout.write("some users have not been notified...")
+
+            for fail in fails:
+                self.stdout.write(f"email: {fail[0]} // {fail[1]}: {fail[2]}")
+
+            raise CommandError(f"Failed to notify {len(fails)} users.")
+
+        self.stdout.write(self.style.SUCCESS("success"))
+        self.stdout.write("end")
diff --git a/backend/core/templates/core/no_contrib_email/body.html b/backend/core/templates/core/no_contrib_email/body.html
new file mode 100644
index 0000000000..9bb713f36f
--- /dev/null
+++ b/backend/core/templates/core/no_contrib_email/body.html
@@ -0,0 +1,9 @@
+{% load i18n %}
+<!DOCTYPE html>
+<html>
+  <body>
+    <p>
+      {% blocktranslate %}coucou{% endblocktranslate %}
+    </p>
+  </body>
+</html>
diff --git a/backend/core/templates/core/no_contrib_email/subject.txt b/backend/core/templates/core/no_contrib_email/subject.txt
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/backend/settings/settings.py b/backend/settings/settings.py
index ab9ed1b452..a84cf661df 100644
--- a/backend/settings/settings.py
+++ b/backend/settings/settings.py
@@ -429,7 +429,10 @@
         REST_REGISTRATION.get(
             "REGISTER_VERIFICATION_PERIOD",
             datetime.timedelta(days=7)
-        )
+        ),
+    # Active users who haven't contributed since their account was created will be
+    # notified after this number of days.
+    "MGMT_NO_CONTRIBUTION_REMINDER_PERIOD": datetime.timedelta(days=10)
 }
 
 # Configuration of the app `tournesol`