Refactored Theme class to correspond SOLID patterns

scripts/utils/color_converter.py

@@ -0,0 +1,42 @@
+import colorsys
+from abc import ABC, abstractmethod
+
+
+class ColorConverter(ABC):
+    @staticmethod
+    @abstractmethod
+    def hex_to_rgba(hex_color):
+        pass
+
+    @staticmethod
+    @abstractmethod
+    def hsl_to_rgb(hue, saturation, lightness):
+        pass
+
+
+class ColorConverterImpl(ColorConverter):
+    @staticmethod
+    def hex_to_rgba(hex_color):
+        try:
+            if len(hex_color) in range(6, 10):
+                hex_color = hex_color.lstrip('#') + "ff"
+                # if is convertable
+                int(hex_color[:], 16)
+            else:
+                raise ValueError
+
+        except ValueError:
+            raise ValueError(f'Error: Invalid HEX color code: {hex_color}')
+
+        else:
+            return int(hex_color[0:2], 16), \
+                int(hex_color[2:4], 16), \
+                int(hex_color[4:6], 16), \
+                int(hex_color[6:8], 16) / 255
+
+    @staticmethod
+    def hsl_to_rgb(hue, saturation, lightness):
+        # colorsys works in range(0, 1)
+        h = hue / 360
+        red, green, blue = [int(item * 255) for item in colorsys.hls_to_rgb(h, lightness, saturation)]
+        return red, green, blue