add leaderboard view to admin panel

services/backend/apps/competition/admin.py

@@ -1,7 +1,15 @@
 from django.contrib import admin
+from django.urls import path, reverse
+from django.http import HttpResponse
+from django.template.response import TemplateResponse
+from django.db.models import Count, Q, Sum
+from django.shortcuts import get_object_or_404
+from django.utils.html import format_html
 
+from apps.user.models import User
 from apps.competition.models import Competition
 from apps.task.admin import CompetitionTaskInline
+from apps.task.models import CompetitionTaskSubmission, CompetitionTask
 
 
 @admin.register(Competition)
@@ -11,6 +19,7 @@ class CompetitionAdmin(admin.ModelAdmin):
         "title",
         "end_date",
         "type",
+        "view_leaderboard",
     )
     search_fields = (
         "title",
@@ -21,3 +30,57 @@ class CompetitionAdmin(admin.ModelAdmin):
         "participation_type",
     )
     inlines = [CompetitionTaskInline]
+
+    def get_urls(self):
+        urls = super().get_urls()
+        custom_urls = [
+            path('leaderboard/', self.admin_site.admin_view(self.leaderboard_view), name='competition_leaderboard'),
+            path('<uuid:competition_id>/leaderboard/', self.admin_site.admin_view(self.competition_leaderboard_view), 
+                 name='competition_specific_leaderboard'),
+        ]
+        return custom_urls + urls
+
+    def view_leaderboard(self, obj):
+        url = reverse('admin:competition_specific_leaderboard', args=[obj.id])
+        return format_html('<a href="{}">лидерборд</a>', url)
+    
+    view_leaderboard.short_description = "Лидерборд"
+    view_leaderboard.allow_tags = True
+
+    def competition_leaderboard_view(self, request, competition_id):
+        competition = get_object_or_404(Competition, id=competition_id)
+        
+        competition_tasks = CompetitionTask.objects.filter(competition=competition)
+        
+        leaderboard = User.objects.annotate(
+            total_score=Sum(
+                'competitiontasksubmission__earned_points',
+                filter=Q(
+                    competitiontasksubmission__status='checked',
+                    competitiontasksubmission__task__in=competition_tasks
+                )
+            )
+        ).exclude(total_score__isnull=True).order_by('-total_score')[:20]
+
+        context = dict(
+            self.admin_site.each_context(request),
+            title=f"Лидерборд для {competition.title}",
+            leaderboard=leaderboard,
+            competition=competition,
+        )
+        return TemplateResponse(request, "admin/competition_leaderboard.html", context)
+
+    def leaderboard_view(self, request):
+        leaderboard = User.objects.annotate(
+            total_score=Sum(
+                'competitiontasksubmission__earned_points',
+                filter=Q(competitiontasksubmission__status='checked')
+            )
+        ).exclude(total_score__isnull=True).order_by('-total_score')[:20]
+
+        context = dict(
+            self.admin_site.each_context(request),
+            title="Global Competition Leaderboard",
+            leaderboard=leaderboard,
+        )
+        return TemplateResponse(request, "admin/competition_leaderboard.html", context)