On fait des suggestions en cas d'événement inconnu

Fix #379

src/agenda_culturel/models.py

@@ -1053,6 +1053,28 @@ class Event(models.Model):
             ),
         ]
 
+    def alternative_events_if_not_found(day, slug):
+        title = slug.replace("-", " ")
+        logger.warning(title)
+        qs = (
+            Event.objects.filter(
+                Q(other_versions__isnull=True)
+                | Q(other_versions__representative=F("pk"))
+                | Q(other_versions__representative__isnull=True)
+            )
+            .filter(status=Event.STATUS.PUBLISHED)
+            .annotate(similarity_title=TrigramSimilarity("title", title))
+            .annotate(
+                nbday_distance=Func((ExtractDay(F("start_day") - day)), function="ABS")
+            )
+            .annotate(
+                score=F("similarity_title") * 200 + 30 / (F("nbday_distance") + 1)
+            )
+            .order_by("-score")[:10]
+        )
+
+        return qs.only("title", "start_day", "start_time", "exact_location", "location")
+
     def proposed_events(self):
         threshold_distance = 30000
         min_tags = 1

src/agenda_culturel/static/style.scss

@@ -1319,8 +1319,10 @@ table .buttons {
     margin: 0 1em;
     img {
         width: 100%;
+        @media only screen and (min-width: 512px) {
             margin: -4em 0 0 0;
         }
+    }
 }
 
 
@@ -2186,3 +2188,8 @@ dialog {
     }
     margin-bottom: 1em;
 }
+
+.first-large .slim-description:first-child {
+    @extend article;
+    font-size: 110%;
+}

src/agenda_culturel/templates/page-event-not-found.html

@@ -0,0 +1,48 @@
+{% extends "agenda_culturel/page.html" %}
+{% load i18n %}
+{% load static %}
+{% load utils_extra %}
+{% load static_content_extra %}
+{% block fluid %}{% endblock %}
+{% block title %}
+  {% block og_title %}On a pommé l'événement{% endblock %}
+{% endblock %}
+{% block description %}
+  {% block og_description %}On a rencontré un pépin en cherchant l'événement que tu as demandé !{% endblock %}
+{% endblock %}
+{% block og_image %}
+  {% static 'images/pommes.svg' %}
+{% endblock %}
+{% block content %}
+  <article>
+    <header>
+      <h1>On a pommé l'événement</h1>
+    </header>
+    <div class="image-flottante">
+      <img src="{% static 'images/pommes.svg' %}"
+           alt="quelques pommes et leur pépins" />
+    </div>
+    <p>
+      On a rencontré un pépin en cherchant l'événement que tu as demandé. Mais pas de panique, on a regardé un peu
+      dans nos paniers, et on te propose quelques événements qui pourraient correspondre à ta recherche.
+    </p>
+    <div class="first-large">
+      {% for pe in alternative_events %}
+        {% include "agenda_culturel/single-event/event-slim-inc.html" with event=pe %}
+      {% endfor %}
+    </div>
+  </article>
+  <article class="search" id="search">
+    <header>
+      <h2>Rien trouvé&nbsp;?</h2>
+      <p>Si tu n'as pas trouvé ton bonheur dans toutes ces pages, tu peux aussi fouiller le site&nbsp;:</p>
+    </header>
+    <form method="get" class="form django-form">
+      {{ filter.form.as_div }}
+      <button type="submit">Rechercher</button>
+      <a href="{% url 'event_search' %}">Recherche simplifiée {% picto_from_name "chevron-right" %}</a>
+    </form>
+  </div>
+</div>
+</article>
+{% endblock %}

src/agenda_culturel/views.py

@@ -767,6 +767,34 @@ class EventDetailView(UserPassesTestMixin, DetailView, ModelFormMixin):
         else:
             return o
 
+    def get(self, request, *args, **kwargs):
+        try:
+            self.object = self.get_object()
+        except Http404 as e:
+            if "year" in self.kwargs:
+                y = self.kwargs["year"]
+                m = self.kwargs["month"]
+                d = self.kwargs["day"]
+                day = date(y, m, d)
+                s = self.kwargs["extra"]
+                qs = get_event_qs(request)
+                filter = SimpleSearchEventFilter(
+                    request.GET,
+                    queryset=qs,
+                    request=request,
+                )
+                context = {
+                    "alternative_events": Event.alternative_events_if_not_found(day, s),
+                    "filter": filter,
+                }
+                return render(
+                    request, "page-event-not-found.html", status=404, context=context
+                )
+            else:
+                raise e
+        context = self.get_context_data(object=self.object)
+        return self.render_to_response(context)
+
     def get_success_url(self):
         return self.get_object().get_absolute_url() + "#chronology"