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apps/core/iran_locations.py

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+import json
+from functools import lru_cache
+from pathlib import Path
+
+from django.conf import settings
+
+
+@lru_cache(maxsize=1)
+def location_data():
+    path = Path(settings.BASE_DIR) / "static" / "data" / "iran-locations.json"
+    return json.loads(path.read_text(encoding="utf-8"))
+
+
+@lru_cache(maxsize=1)
+def provinces():
+    return tuple(location_data())
+
+
+@lru_cache(maxsize=1)
+def cities_by_province():
+    return {item["province"]: tuple(item["cities"]) for item in location_data()}
+
+
+def validate_location(province, city):
+    province = (province or "").strip()
+    city = (city or "").strip()
+    if not province and not city:
+        return province, city, None
+    if city and not province:
+        return province, city, "برای انتخاب شهر، ابتدا استان را انتخاب کنید."
+    cities = cities_by_province()
+    if province not in cities:
+        return province, city, "استان انتخاب‌شده معتبر نیست."
+    if city and city not in cities[province]:
+        return province, city, "شهر انتخاب‌شده متعلق به این استان نیست."
+    return province, city, None