From 700488a36b5b11ea68fecff2bfa97f6b58baaff3 Mon Sep 17 00:00:00 2001
From: yuetsh <517252939@qq.com>
Date: Thu, 6 Aug 2026 01:45:33 -0600
Subject: [PATCH] =?UTF-8?q?feat(reaction):=20=E5=90=8E=E5=8F=B0=E8=A1=A8?=
 =?UTF-8?q?=E6=83=85=E7=BB=9F=E8=AE=A1=E6=8E=A5=E5=8F=A3?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
---
 oj/urls.py              |  1 +
 reaction/urls/admin.py  |  7 +++++++
 reaction/views/admin.py | 39 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 47 insertions(+)
 create mode 100644 reaction/urls/admin.py
 create mode 100644 reaction/views/admin.py

diff --git a/oj/urls.py b/oj/urls.py
index 09ab4a6..91c7538 100644
--- a/oj/urls.py
+++ b/oj/urls.py
@@ -16,6 +16,7 @@ urlpatterns = [
     path("api/admin/", include("utils.urls")),
     path("api/", include("message.urls.oj")),
     path("api/", include("reaction.urls.oj")),
+    path("api/admin/", include("reaction.urls.admin")),
     path("api/", include("comment.urls.oj")),
     path("api/admin/", include("comment.urls.admin")),
     path("api/", include("tutorial.urls.tutorial")),
diff --git a/reaction/urls/admin.py b/reaction/urls/admin.py
new file mode 100644
index 0000000..9bf6fb8
--- /dev/null
+++ b/reaction/urls/admin.py
@@ -0,0 +1,7 @@
+from django.urls import path
+
+from ..views.admin import ReactionStatsAPI
+
+urlpatterns = [
+    path("reaction", ReactionStatsAPI.as_view()),
+]
diff --git a/reaction/views/admin.py b/reaction/views/admin.py
new file mode 100644
index 0000000..9af0285
--- /dev/null
+++ b/reaction/views/admin.py
@@ -0,0 +1,39 @@
+from django.db.models import Count, F, FloatField, Q
+from django.db.models.functions import Cast
+
+from account.decorators import super_admin_required
+from reaction.models import Reaction, ReactionType
+from utils.api import APIView
+
+MIN_USERS_FOR_RATIO = 3
+DEFAULT_ORDERING = "-users"
+
+
+class ReactionStatsAPI(APIView):
+    @super_admin_required
+    def get(self, request):
+        queryset = (
+            Reaction.objects.values(pid=F("problem___id"), title=F("problem__title"))
+            .annotate(users=Count("user", distinct=True))
+            .annotate(**{t.value: Count("id", filter=Q(type=t.value)) for t in ReactionType})
+            .annotate(**{f"{t.value}_ratio": Cast(t.value, FloatField()) / Cast("users", FloatField()) for t in ReactionType})
+        )
+
+        problem_id = request.GET.get("problem")
+        if problem_id:
+            queryset = queryset.filter(problem___id__iexact=problem_id, problem__contest_id__isnull=True)
+
+        ordering = request.GET.get("ordering") or DEFAULT_ORDERING
+        prefix = "-" if ordering.startswith("-") else ""
+        field = ordering.lstrip("-")
+        if field == "users":
+            order_by = f"{prefix}users"
+        elif field in ReactionType.values:
+            # 按占比排序时过滤低样本，避免 1 人点 1 个就冲到 100%
+            queryset = queryset.filter(users__gte=MIN_USERS_FOR_RATIO)
+            order_by = f"{prefix}{field}_ratio"
+        else:
+            order_by = DEFAULT_ORDERING
+
+        queryset = queryset.order_by(order_by)
+        return self.success(self.paginate_data(request, queryset))