From 885d02cecac0b6e69cb731b1186b5f77ae9bf6fa Mon Sep 17 00:00:00 2001
From: Jakob Ketterl <jakob.ketterl@gmx.de>
Date: Sun, 22 Mar 2020 21:51:49 +0100
Subject: [PATCH] start implementing property layering

---
 owrx/property/__init__.py              | 22 +++++++++++++
 test/property/test_property_overlay.py | 43 ++++++++++++++++++++++++++
 2 files changed, 65 insertions(+)
 create mode 100644 test/property/test_property_overlay.py

diff --git a/owrx/property/__init__.py b/owrx/property/__init__.py
index 7ef892a..655cd42 100644
--- a/owrx/property/__init__.py
+++ b/owrx/property/__init__.py
@@ -119,3 +119,25 @@ class PropertyManager(object):
             if p.getValue() is None:
                 p.setValue(other_pm[key])
         return self
+
+
+class PropertyLayers(object):
+    def __init__(self):
+        self.layers = []
+
+    def addLayer(self, priority: int, pm: PropertyManager):
+        """
+        highest priority = 0
+        """
+        self.layers.append({"priority": priority, "props": pm})
+
+    def removeLayer(self, pm: PropertyManager):
+        for layer in self.layers:
+            if layer["props"] == pm:
+                self.layers.remove(layer)
+
+    def __getitem__(self, item):
+        layers = [la["props"] for la in sorted(self.layers, key=lambda l: l["priority"])]
+        for m in layers:
+            if item in m:
+                return m[item]
\ No newline at end of file
diff --git a/test/property/test_property_overlay.py b/test/property/test_property_overlay.py
new file mode 100644
index 0000000..efa330a
--- /dev/null
+++ b/test/property/test_property_overlay.py
@@ -0,0 +1,43 @@
+from unittest import TestCase
+from unittest.mock import Mock
+from owrx.property import PropertyManager, PropertyLayers
+
+
+class TestPropertyMock(TestCase):
+    def testLayer(self):
+        om = PropertyLayers()
+        pm = PropertyManager()
+        pm["testkey"] = "testvalue"
+        om.addLayer(1, pm)
+        self.assertEqual(om["testkey"], "testvalue")
+
+    def testHighPriority(self):
+        om = PropertyLayers()
+        low_pm = PropertyManager()
+        high_pm = PropertyManager()
+        low_pm["testkey"] = "low value"
+        high_pm["testkey"] = "high value"
+        om.addLayer(1, low_pm)
+        om.addLayer(0, high_pm)
+        self.assertEqual(om["testkey"], "high value")
+
+    def testPriorityFallback(self):
+        om = PropertyLayers()
+        low_pm = PropertyManager()
+        high_pm = PropertyManager()
+        low_pm["testkey"] = "low value"
+        om.addLayer(1, low_pm)
+        om.addLayer(0, high_pm)
+        self.assertEqual(om["testkey"], "low value")
+
+    def testLayerRemoval(self):
+        om = PropertyLayers()
+        low_pm = PropertyManager()
+        high_pm = PropertyManager()
+        low_pm["testkey"] = "low value"
+        high_pm["testkey"] = "high value"
+        om.addLayer(1, low_pm)
+        om.addLayer(0, high_pm)
+        self.assertEqual(om["testkey"], "high value")
+        om.removeLayer(high_pm)
+        self.assertEqual(om["testkey"], "low value")