From e070fd128145263d96300e99b929d4eebe1919b5 Mon Sep 17 00:00:00 2001
From: Luca <Luca@hackerspace-bamberg.de>
Date: Fri, 15 Dec 2023 17:12:12 +0100
Subject: [PATCH] feat: add presenter view

---
 .../templates/pretalx_musicrate/present.html  |   4 +
 .../pretalx_musicrate/submission_base.html    |  55 +++++++++
 pretalx_musicrate/urls.py                     |   3 +-
 pretalx_musicrate/views.py                    | 112 ++++++++++++++++++
 pyproject.toml                                |   1 +
 5 files changed, 174 insertions(+), 1 deletion(-)
 create mode 100644 pretalx_musicrate/templates/pretalx_musicrate/present.html
 create mode 100644 pretalx_musicrate/templates/pretalx_musicrate/submission_base.html

diff --git a/pretalx_musicrate/templates/pretalx_musicrate/present.html b/pretalx_musicrate/templates/pretalx_musicrate/present.html
new file mode 100644
index 0000000..4a1870e
--- /dev/null
+++ b/pretalx_musicrate/templates/pretalx_musicrate/present.html
@@ -0,0 +1,4 @@
+{% extends "pretalx_musicrate/submission_base.html" %}
+
+{% block submission_content %}
+{% endblock %}
diff --git a/pretalx_musicrate/templates/pretalx_musicrate/submission_base.html b/pretalx_musicrate/templates/pretalx_musicrate/submission_base.html
new file mode 100644
index 0000000..4be5863
--- /dev/null
+++ b/pretalx_musicrate/templates/pretalx_musicrate/submission_base.html
@@ -0,0 +1,55 @@
+{% extends "cfp/event/base.html" %}
+{% load compress %}
+{% load i18n %}
+
+{% block title %}{{ submission.title }} ::{% endblock %}
+
+{% block cfp_header %}
+    {% compress css %}
+        <style>
+            .musicrate-pagination {
+                display: flex;
+            }
+            .musicrate-pagination > * {
+                flex-basis: 0;
+            }
+            .musicrate-pagination > a {
+                flex-grow: 1;
+            }
+            .musicrate-pagination > a:last-child {
+                text-align: right;
+            }
+        </style>
+    {% endcompress %}
+    {% block submission_header %}
+    {% endblock %}
+{% endblock %}
+
+{% block content %}
+    {% translate "(not specified)" as not_specified %}
+    <h1>{{ submission.title }}</h1>
+    <p>
+        {{ genre|default:not_specified }} &middot; {{ origin|default:not_specified }}
+        {% if submission.internal_notes %}
+            <br>
+            {{ submission.internal_notes }}
+        {% endif %}
+    </p>
+    {% block submission_content %}
+    {% endblock %}
+    <div class="musicrate-pagination">
+        {% if prev %}
+            <a href="{{ prev }}">&lt; {% translate "Previous" %}</a>
+        {% else %}
+            <a></a>
+        {% endif %}
+        {% if index and count %}
+            {{ index }}/{{ count }}
+        {% endif %}
+        {% if next and can_continue %}
+            <a href="{{ next }}">{% translate "Next" %} &gt;</a>
+        {% else %}
+            <a></a>
+        {% endif %}
+    </div>
+{% endblock %}
diff --git a/pretalx_musicrate/urls.py b/pretalx_musicrate/urls.py
index e638c96..b2f86cc 100644
--- a/pretalx_musicrate/urls.py
+++ b/pretalx_musicrate/urls.py
@@ -1,6 +1,6 @@
 from django.urls import include, path
 
-from .views import JoinView, MusicrateSettingsView, QRCodeView
+from .views import JoinView, MusicrateSettingsView, PresenterView, QRCodeView
 
 urlpatterns = [
     path(
@@ -13,6 +13,7 @@ urlpatterns = [
         include(
             [
                 path("", QRCodeView.as_view(), name="qrcode"),
+                path("present/<code>/", PresenterView.as_view(), name="present"),
                 path("<slug:token>/", JoinView.as_view(), name="join"),
             ]
         ),
diff --git a/pretalx_musicrate/views.py b/pretalx_musicrate/views.py
index 8970527..5e73616 100644
--- a/pretalx_musicrate/views.py
+++ b/pretalx_musicrate/views.py
@@ -1,10 +1,16 @@
 from hmac import compare_digest
+from operator import itemgetter
 
 from django.contrib import messages
+from django.db.models import F, Max, Min, Window
+from django.db.models.functions import RowNumber
 from django.shortcuts import redirect
 from django.urls import reverse
+from django.utils.functional import cached_property
 from django.utils.translation import gettext_lazy as _
 from django.views.generic import FormView, TemplateView
+from django.views.generic.detail import SingleObjectMixin
+from django_context_decorator import context
 from pretalx.common.mixins.views import EventPermissionRequired
 
 from .forms import MusicrateSettingsForm
@@ -77,3 +83,109 @@ class QRCodeView(EventPermissionRequired, TemplateView):
             )
         )
         return context
+
+
+class SubmissionMixin(SingleObjectMixin):
+    slug_field = "code"
+    slug_url_kwarg = "code"
+
+    def get_queryset(self):
+        return self.request.event.submissions.prefetch_related("answers").filter(
+            submission_type__in=self.request.event.pretalx_musicrate_settings.submission_types.all()
+        )
+
+    @context
+    @cached_property
+    def submission(self):
+        return self.get_object()
+
+    @context
+    @cached_property
+    def genre(self):
+        return (
+            self.submission.answers.filter(
+                question=self.request.event.pretalx_musicrate_settings.genre_question
+            )
+            .values_list("answer", flat=True)
+            .first()
+        )
+
+    @context
+    @cached_property
+    def origin(self):
+        return (
+            self.submission.answers.filter(
+                question=self.request.event.pretalx_musicrate_settings.origin_question
+            )
+            .values_list("answer", flat=True)
+            .first()
+        )
+
+    def get_url_kwargs(self, **kwargs):
+        return self.request.resolver_match.kwargs | kwargs
+
+    @context
+    @cached_property
+    def prev(self):
+        prev = (
+            self.get_queryset()
+            .annotate(prev=Max("created"))
+            .filter(created__lt=self.submission.created, created=F("prev"))
+            .first()
+        )
+        if prev is None:
+            return None
+        return reverse(
+            self.request.resolver_match.view_name,
+            kwargs=self.get_url_kwargs(code=prev.code),
+        )
+
+    @context
+    @cached_property
+    def index(self):
+        return next(
+            map(
+                itemgetter(1),
+                filter(
+                    lambda s: s[0] == self.submission.pk,
+                    self.get_queryset()
+                    .annotate(index=Window(expression=RowNumber(), order_by="created"))
+                    .values_list("pk", "index"),
+                ),
+            )
+        )
+
+    @context
+    @cached_property
+    def count(self):
+        return self.get_queryset().count()
+
+    @context
+    @cached_property
+    def next(self):
+        next = (
+            self.get_queryset()
+            .annotate(next=Min("created"))
+            .filter(created__gt=self.submission.created, created=F("next"))
+            .first()
+        )
+        if next is None:
+            return None
+        return reverse(
+            self.request.resolver_match.view_name,
+            kwargs=self.get_url_kwargs(code=next.code),
+        )
+
+
+class PresenterView(EventPermissionRequired, SubmissionMixin, TemplateView):
+    permission_required = "orga.view_submissions"
+    template_name = "pretalx_musicrate/present.html"
+
+    @context
+    @property
+    def can_continue(self):
+        return True
+
+    def get(self, request, *args, **kwargs):
+        self.object = self.get_object()
+        return super().get(request, *args, **kwargs)
diff --git a/pyproject.toml b/pyproject.toml
index 8294e67..bf22e53 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,6 +14,7 @@ maintainers = [
 
 dependencies = [
   "Django",
+  "django-context-decorator",
   "django-i18nfield",
   "pretalx",
   "qrcode",