From 97d8a692127ca9a7ec08cd525a1014538f635c2c Mon Sep 17 00:00:00 2001
From: Konrad du Plessis <konradzar@gmail.com>
Date: Thu, 23 Apr 2026 14:54:50 +0200
Subject: [PATCH] feat(adjustments): add |type_slug template filter for badge
 class naming

---
 core/templatetags/format_tags.py | 16 ++++++++++++++++
 core/tests.py                    | 25 +++++++++++++++++++++++++
 2 files changed, 41 insertions(+)

diff --git a/core/templatetags/format_tags.py b/core/templatetags/format_tags.py
index 5c2ec9b..7723980 100644
--- a/core/templatetags/format_tags.py
+++ b/core/templatetags/format_tags.py
@@ -27,6 +27,22 @@ def money(value):
     return formatted.replace(",", " ")
 
 
+# === type_slug filter ===
+# Converts adjustment-type labels like "Advance Payment" to
+# CSS-class-friendly slugs like "advance-payment". Used by the Adjustments
+# tab to pick the right colour badge class per row.
+@register.filter
+def type_slug(value):
+    """Return a hyphen-separated lowercase version of `value`.
+
+    Used in templates: `<span class="badge-type-{{ adj.type|type_slug }}">`.
+    Returns '' for None / empty — no class generated, no crash.
+    """
+    if not value:
+        return ''
+    return value.lower().replace(' ', '-')
+
+
 @register.filter
 def dictlookup(d, key):
     """Look up a dict value by a dynamic key.
diff --git a/core/tests.py b/core/tests.py
index bfa25c2..340d270 100644
--- a/core/tests.py
+++ b/core/tests.py
@@ -912,3 +912,28 @@ class InlineFiltersPairsContextTests(TestCase):
         project_ids = {p.id for p in resp.context['projects']}
         self.assertIn(out_project.id, project_ids,
             'URL-selected project must survive the date-scope filter')
+
+
+# =============================================================================
+# === TESTS FOR |type_slug FILTER ===
+# Used by Adjustments tab to build CSS class names from type labels.
+# =============================================================================
+
+
+class TypeSlugFilterTests(TestCase):
+    """format_tags.type_slug converts adjustment-type labels to slugs."""
+
+    def test_spaces_become_hyphens_and_lowercased(self):
+        from core.templatetags.format_tags import type_slug
+        self.assertEqual(type_slug('Advance Payment'), 'advance-payment')
+        self.assertEqual(type_slug('New Loan'), 'new-loan')
+        self.assertEqual(type_slug('Bonus'), 'bonus')
+
+    def test_empty_or_none_returns_empty_string(self):
+        from core.templatetags.format_tags import type_slug
+        self.assertEqual(type_slug(''), '')
+        self.assertEqual(type_slug(None), '')
+
+    def test_idempotent_on_already_slugged(self):
+        from core.templatetags.format_tags import type_slug
+        self.assertEqual(type_slug('bonus'), 'bonus')