From 4c599583ffc3644b8341209deb00897d6dcf78e7 Mon Sep 17 00:00:00 2001
From: rafalp <kontakt@rpiton.com>
Date: Tue, 3 Sep 2024 22:25:19 +0200
Subject: [PATCH] Blank redirect view, add page no for offset calculation for
 thread replies paginator

---
 misago/threads/paginator.py                   |   6 +-
 .../tests/test_thread_replies_paginator.py    | 258 ++++++++++++++++++
 misago/threads/views/redirect.py              |   5 +
 3 files changed, 268 insertions(+), 1 deletion(-)
 create mode 100644 misago/threads/tests/test_thread_replies_paginator.py
 create mode 100644 misago/threads/views/redirect.py

diff --git a/misago/threads/paginator.py b/misago/threads/paginator.py
index ff983cfa3..df4077437 100644
--- a/misago/threads/paginator.py
+++ b/misago/threads/paginator.py
@@ -1,3 +1,5 @@
+from math import ceil
+
 from django.core.paginator import Paginator
 
 
@@ -23,4 +25,6 @@ def page(self, number):
 
 
 class ThreadRepliesPaginator(Paginator):
-    pass
+    def get_item_page(self, offset: int) -> int:
+        item_page = ceil((offset + 1) / self.per_page)
+        return min(item_page, self.num_pages)
diff --git a/misago/threads/tests/test_thread_replies_paginator.py b/misago/threads/tests/test_thread_replies_paginator.py
new file mode 100644
index 000000000..744564303
--- /dev/null
+++ b/misago/threads/tests/test_thread_replies_paginator.py
@@ -0,0 +1,258 @@
+from ..paginator import ThreadRepliesPaginator
+from ..test import reply_thread
+
+
+def test_thread_replies_paginator_counts_pages_without_orphans(thread):
+    paginator = ThreadRepliesPaginator(thread.post_set, 5, 0)
+    assert paginator.count == 1
+    assert paginator.num_pages == 1
+
+    # Fill in first page
+    for i in range(4):
+        reply_thread(thread)
+        paginator = ThreadRepliesPaginator(thread.post_set, 5, 0)
+        assert paginator.count == 2 + i
+        assert paginator.num_pages == 1
+
+    paginator = ThreadRepliesPaginator(thread.post_set, 5, 0)
+    assert paginator.count == 5
+    assert paginator.num_pages == 1
+
+    # Fill in second page
+    for i in range(5):
+        reply_thread(thread)
+        paginator = ThreadRepliesPaginator(thread.post_set, 5, 0)
+        assert paginator.count == 6 + i
+        assert paginator.num_pages == 2
+
+    paginator = ThreadRepliesPaginator(thread.post_set, 5, 0)
+    assert paginator.count == 10
+    assert paginator.num_pages == 2
+
+    # Fill in third page
+    for i in range(5):
+        reply_thread(thread)
+        paginator = ThreadRepliesPaginator(thread.post_set, 5, 0)
+        assert paginator.count == 11 + i
+        assert paginator.num_pages == 3
+
+    paginator = ThreadRepliesPaginator(thread.post_set, 5, 0)
+    assert paginator.count == 15
+    assert paginator.num_pages == 3
+
+
+def test_thread_replies_paginator_counts_pages_with_orphans(thread):
+    paginator = ThreadRepliesPaginator(thread.post_set, 5, 2)
+    assert paginator.count == 1
+    assert paginator.num_pages == 1
+
+    # Fill in first page
+    for i in range(4):
+        reply_thread(thread)
+        paginator = ThreadRepliesPaginator(thread.post_set, 5, 2)
+        assert paginator.count == 2 + i
+        assert paginator.num_pages == 1
+
+    paginator = ThreadRepliesPaginator(thread.post_set, 5, 2)
+    assert paginator.count == 5
+    assert paginator.num_pages == 1
+
+    # Add orphans
+    for i in range(2):
+        reply_thread(thread)
+        paginator = ThreadRepliesPaginator(thread.post_set, 5, 2)
+        assert paginator.count == 6 + i
+        assert paginator.num_pages == 1
+
+    paginator = ThreadRepliesPaginator(thread.post_set, 5, 2)
+    assert paginator.count == 7
+    assert paginator.num_pages == 1
+
+    # Orphans + 1 produces new page
+    reply_thread(thread)
+    paginator = ThreadRepliesPaginator(thread.post_set, 5, 2)
+    assert paginator.count == 8
+    assert paginator.num_pages == 2
+
+    # Fill in second page
+    for i in range(2):
+        reply_thread(thread)
+        paginator = ThreadRepliesPaginator(thread.post_set, 5, 2)
+        assert paginator.count == 9 + i
+        assert paginator.num_pages == 2
+
+    paginator = ThreadRepliesPaginator(thread.post_set, 5, 2)
+    assert paginator.count == 10
+    assert paginator.num_pages == 2
+
+    # Add orphans
+    for i in range(2):
+        reply_thread(thread)
+        paginator = ThreadRepliesPaginator(thread.post_set, 5, 2)
+        assert paginator.count == 11 + i
+        assert paginator.num_pages == 2
+
+    paginator = ThreadRepliesPaginator(thread.post_set, 5, 2)
+    assert paginator.count == 12
+    assert paginator.num_pages == 2
+
+    # Orphans + 1 produces new page
+    reply_thread(thread)
+    paginator = ThreadRepliesPaginator(thread.post_set, 5, 2)
+    assert paginator.count == 13
+    assert paginator.num_pages == 3
+
+
+def test_thread_replies_paginator_without_orphans_calculates_item_page(thread):
+    paginator = ThreadRepliesPaginator(thread.post_set, 5, 0)
+
+    # First item page
+    assert paginator.get_item_page(0) == 1
+
+    # First page items
+    for i in range(4):
+        reply_thread(thread)
+        paginator = ThreadRepliesPaginator(thread.post_set, 5, 0)
+        assert paginator.get_item_page(i) == 1
+
+    paginator = ThreadRepliesPaginator(thread.post_set, 5, 0)
+    assert paginator.count == 5
+    assert paginator.num_pages == 1
+
+    # Second page items
+    for i in range(5):
+        reply_thread(thread)
+        paginator = ThreadRepliesPaginator(thread.post_set, 5, 0)
+        assert paginator.get_item_page(5 + i) == 2
+
+    paginator = ThreadRepliesPaginator(thread.post_set, 5, 0)
+    assert paginator.count == 10
+    assert paginator.num_pages == 2
+
+    # Third page items
+    for i in range(5):
+        reply_thread(thread)
+        paginator = ThreadRepliesPaginator(thread.post_set, 5, 0)
+        assert paginator.get_item_page(10 + i) == 3
+
+    paginator = ThreadRepliesPaginator(thread.post_set, 5, 0)
+    assert paginator.count == 15
+    assert paginator.num_pages == 3
+
+
+def test_thread_replies_paginator_with_orphans_calculates_item_page(thread):
+    paginator = ThreadRepliesPaginator(thread.post_set, 5, 3)
+
+    # First item page
+    assert paginator.get_item_page(0) == 1
+
+    # First page items
+    for i in range(4):
+        reply_thread(thread)
+        paginator = ThreadRepliesPaginator(thread.post_set, 5, 0)
+        assert paginator.get_item_page(i) == 1
+
+    paginator = ThreadRepliesPaginator(thread.post_set, 5, 0)
+    assert paginator.count == 5
+    assert paginator.num_pages == 1
+
+    # Add orphans
+    for i in range(2):
+        reply_thread(thread)
+        paginator = ThreadRepliesPaginator(thread.post_set, 5, 2)
+        assert paginator.get_item_page(i) == 1
+
+    paginator = ThreadRepliesPaginator(thread.post_set, 5, 2)
+    assert paginator.count == 7
+    assert paginator.num_pages == 1
+
+    # Orphans + 1 produces second page
+    reply_thread(thread)
+    paginator = ThreadRepliesPaginator(thread.post_set, 5, 2)
+    assert paginator.count == 8
+    assert paginator.num_pages == 2
+
+    # Item offsets changed when orphans were moved to second page
+    for i in range(8):
+        if i < 5:
+            assert paginator.get_item_page(i) == 1
+        else:
+            assert paginator.get_item_page(i) == 2
+
+    # Fill in second page items
+    for i in range(2):
+        reply_thread(thread)
+        paginator = ThreadRepliesPaginator(thread.post_set, 5, 2)
+        assert paginator.get_item_page(9 + i) == 2
+
+    paginator = ThreadRepliesPaginator(thread.post_set, 5, 2)
+    assert paginator.count == 10
+    assert paginator.num_pages == 2
+
+    # Add orphans to second page
+    for i in range(2):
+        reply_thread(thread)
+        paginator = ThreadRepliesPaginator(thread.post_set, 5, 2)
+        assert paginator.get_item_page(11 + i) == 2
+
+    paginator = ThreadRepliesPaginator(thread.post_set, 5, 2)
+    assert paginator.count == 12
+    assert paginator.num_pages == 2
+
+    # Orphans + 1 produces third page
+    reply_thread(thread)
+    paginator = ThreadRepliesPaginator(thread.post_set, 5, 2)
+    assert paginator.count == 13
+    assert paginator.num_pages == 3
+
+    for i in range(13):
+        if i < 5:
+            assert paginator.get_item_page(i) == 1
+        elif i < 10:
+            assert paginator.get_item_page(i) == 2
+        else:
+            assert paginator.get_item_page(i) == 3
+
+    # Fill in third page
+    for i in range(2):
+        reply_thread(thread)
+        paginator = ThreadRepliesPaginator(thread.post_set, 5, 2)
+        assert paginator.get_item_page(14 + i) == 3
+
+    paginator = ThreadRepliesPaginator(thread.post_set, 5, 2)
+    assert paginator.count == 15
+    assert paginator.num_pages == 3
+
+    # Add orphans to third page
+    for i in range(2):
+        reply_thread(thread)
+        paginator = ThreadRepliesPaginator(thread.post_set, 5, 2)
+        assert paginator.get_item_page(16 + i) == 3
+
+    paginator = ThreadRepliesPaginator(thread.post_set, 5, 2)
+    assert paginator.count == 17
+    assert paginator.num_pages == 3
+
+    for i in range(17):
+        if i < 5:
+            assert paginator.get_item_page(i) == 1
+        elif i < 10:
+            assert paginator.get_item_page(i) == 2
+        else:
+            assert paginator.get_item_page(i) == 3
+
+    # Orphans + 1 produces four page
+    reply_thread(thread)
+    paginator = ThreadRepliesPaginator(thread.post_set, 5, 2)
+    assert paginator.count == 18
+    assert paginator.num_pages == 4
+
+    for i in range(18):
+        if i < 5:
+            assert paginator.get_item_page(i) == 1
+        elif i < 10:
+            assert paginator.get_item_page(i) == 2
+        elif i < 15:
+            assert paginator.get_item_page(i) == 3
+        else:
+            assert paginator.get_item_page(i) == 4
diff --git a/misago/threads/views/redirect.py b/misago/threads/views/redirect.py
new file mode 100644
index 000000000..ae7bfbaf4
--- /dev/null
+++ b/misago/threads/views/redirect.py
@@ -0,0 +1,5 @@
+from django.views import View
+
+
+class RedirectView(View):
+    pass