Update data/drapery.py

data/drapery.py

@@ -283,6 +283,53 @@ class Drapery:
         self.fullness = fullness
         self.enabled = enabled
         self.shading_device = shading_device
+
+    def _validate_inputs(self, drapery_type: str, orientation: str, hour: int, latitude: Any, month: str) -> Tuple[bool, str, str]:
+        """Validate inputs for drapery shading coefficient calculations, following ASHRAE latitude handling."""
+        valid_drapery_types = list(self.shading_coefficients.keys())
+        valid_orientations = [e.value for e in Orientation]
+        valid_latitudes = ['24N', '32N', '40N', '48N', '56N']
+        valid_months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
+
+        if drapery_type not in valid_drapery_types:
+            return False, f"Invalid drapery type: {drapery_type}. Valid types: {valid_drapery_types}", ""
+        if orientation not in valid_orientations:
+            return False, f"Invalid orientation: {orientation}. Valid orientations: {valid_orientations}", ""
+        if hour not in range(24):
+            return False, "Hour must be between 0 and 23.", ""
+
+        # Handle latitude input, following ASHRAE
+        mapped_latitude = ""
+        if latitude not in valid_latitudes:
+            try:
+                if isinstance(latitude, str):
+                    lat_str = latitude.upper().strip().replace('°', '').replace(' ', '')
+                    num_part = ''.join(c for c in lat_str if c.isdigit() or c == '.')
+                    lat_val = float(num_part)
+                    if 'S' in lat_str:
+                        lat_val = -lat_val
+                else:
+                    lat_val = float(latitude)
+                abs_lat = abs(lat_val)
+                if abs_lat < 28:
+                    mapped_latitude = '24N'
+                elif abs_lat < 36:
+                    mapped_latitude = '32N'
+                elif abs_lat < 44:
+                    mapped_latitude = '40N'
+                elif abs_lat < 52:
+                    mapped_latitude = '48N'
+                else:
+                    mapped_latitude = '56N'
+            except (ValueError, TypeError):
+                return False, f"Invalid latitude: {latitude}. Valid latitudes: {valid_latitudes}", ""
+        else:
+            mapped_latitude = latitude
+
+        if month not in valid_months:
+            return False, f"Invalid month: {month}. Valid months: {valid_months}", ""
+
+        return True, "Valid inputs.", mapped_latitude        
     
     def get_openness_category(self) -> str:
         """Get openness category as string."""