From 6b46751fe30144d31cfb9ac603fd42f0317ea55b Mon Sep 17 00:00:00 2001
From: Mandel Olaiya <mandeleolaiya15@icloud.com>
Date: Sat, 2 May 2026 21:20:13 +0200
Subject: [PATCH] fix: language switcher uses translated page URLs

---
 .../headers/partials/carbasa-user-bar.html    | 23 ++++---
 .../templatetags/localized_navigation.py      | 67 ++++++++++++++++++-
 2 files changed, 78 insertions(+), 12 deletions(-)

diff --git a/mandelstudio/templates/oxyan/headers/partials/carbasa-user-bar.html b/mandelstudio/templates/oxyan/headers/partials/carbasa-user-bar.html
index c070b2c..c6a9b72 100644
--- a/mandelstudio/templates/oxyan/headers/partials/carbasa-user-bar.html
+++ b/mandelstudio/templates/oxyan/headers/partials/carbasa-user-bar.html
@@ -1,9 +1,10 @@
-{% load i18n %}
+{% load i18n localized_navigation %}
 
 <div class="header-right">
     {% get_current_language as current_language %}
     {% get_available_languages as available_languages %}
     {% get_language_info_list for available_languages as languages %}
+    {% request_language_options as language_options %}
 
     <div class="dropdown language-dropdown me-2">
         <button
@@ -27,18 +28,18 @@
             </svg>
         </button>
         <ul class="dropdown-menu dropdown-menu-end" aria-labelledby="header-language-switcher">
-            <form action="{% url 'set_language' %}" method="post" class="language_form">
-                {% csrf_token %}
-                <input name="next" type="hidden" value="{{ request.path }}"/>
+            {% for option in language_options %}
                 {% for language in languages %}
-                    <li>
-                        <button class="dropdown-item d-flex align-items-center gap-2" type="submit" value="{{ language.code }}" name="language">
-                            {% include "oxyan/partials/flags/"|add:language.code|add:".svg" %}
-                            <span>{{ language.name_local|title }}</span>
-                        </button>
-                    </li>
+                    {% if language.code == option.code %}
+                        <li>
+                            <a class="dropdown-item d-flex align-items-center gap-2" href="{{ option.url }}">
+                                {% include "oxyan/partials/flags/"|add:language.code|add:".svg" %}
+                                <span>{{ language.name_local|title }}</span>
+                            </a>
+                        </li>
+                    {% endif %}
                 {% endfor %}
-            </form>
+            {% endfor %}
         </ul>
     </div>
 
diff --git a/mandelstudio/templatetags/localized_navigation.py b/mandelstudio/templatetags/localized_navigation.py
index 017aaa7..2af5d7d 100644
--- a/mandelstudio/templatetags/localized_navigation.py
+++ b/mandelstudio/templatetags/localized_navigation.py
@@ -3,7 +3,7 @@ from __future__ import annotations
 from django import template
 from django.conf import settings
 
-from wagtail.models import Page
+from wagtail.models import Locale, Page, Site
 
 register = template.Library()
 
@@ -47,6 +47,63 @@ def _build_absolute_url(request, path: str | None, page=None) -> str:
     return path or ""
 
 
+def _resolve_page_from_request(request) -> Page | None:
+    """
+    Best-effort resolution of the Wagtail page for the current request.
+
+    This is used by the language switcher ESI fragment where `page/self` isn't
+    available in the template context.
+    """
+    if request is None:
+        return None
+
+    try:
+        site = Site.find_for_request(request)
+    except Exception:  # pragma: no cover
+        site = None
+
+    if site is None:
+        site = Site.objects.filter(is_default_site=True).first()
+    if site is None:
+        return None
+
+    path = getattr(request, "path_info", None) or getattr(request, "path", "/")
+    path_components = [c for c in path.strip("/").split("/") if c]
+
+    try:
+        locale_codes = set(Locale.objects.values_list("language_code", flat=True))
+    except Exception:  # pragma: no cover
+        locale_codes = set()
+
+    if path_components and path_components[0] in locale_codes:
+        path_components = path_components[1:]
+
+    root = site.root_page
+    language_code = getattr(request, "LANGUAGE_CODE", None)
+    locale = None
+    if language_code:
+        try:
+            locale = Locale.objects.get(
+                language_code=_normalize_language_code(language_code)
+            )
+        except Locale.DoesNotExist:
+            locale = None
+
+    if locale is not None:
+        translated_root = (
+            Page.objects.filter(translation_key=root.translation_key, locale=locale)
+            .specific()
+            .first()
+        )
+        if translated_root is not None:
+            root = translated_root
+
+    try:
+        return root.specific.route(request, path_components).page.specific
+    except Exception:
+        return None
+
+
 @register.simple_tag
 def page_language_options(page):
     labels = {
@@ -82,6 +139,14 @@ def page_language_options(page):
     return options
 
 
+@register.simple_tag(takes_context=True)
+def request_language_options(context):
+    page = context.get("page") or context.get("self")
+    if page is None:
+        page = _resolve_page_from_request(context.get("request"))
+    return page_language_options(page)
+
+
 @register.simple_tag(takes_context=True)
 def page_canonical_url(context):
     request = context.get("request")