Allow arbitrary number of stops

dashboard.py

@@ -87,34 +87,21 @@ class Widget:
         if value == None:
             value = self.lastvalue
         log.debug("stops = %s", self.stops)
-        brightness = 30
-        if self.stops[0] < self.stops[2]:
-            if value < self.stops[0]:
-                log.debug("definitely ok")
+        stops = self.stops
+        if stops[-1] < stops[0]:
+            value = -value
+            stops = [-v for v in stops]
+
+        if value <= stops[0]:
+            log.debug("ok")
             return 100
-            elif value < self.stops[1]:
-                log.debug("mostly ok")
-                return 100 - (value - self.stops[0]) / (self.stops[1] - self.stops[0]) * 50
-            elif value < self.stops[2]:
-                log.debug("maybe fail")
-                return 50 - (value - self.stops[1]) / (self.stops[2] - self.stops[1]) * 50
-            else:
-                log.debug("definitely fail")
-                return 0
-        else:
-            log.debug("the other side")
-            if value > self.stops[0]:
-                log.debug("definitely ok")
-                return 100
-            elif value > self.stops[1]:
-                log.debug("mostly ok")
-                return 100 - (value - self.stops[0]) / (self.stops[1] - self.stops[0]) * 50
-            elif value > self.stops[2]:
-                log.debug("maybe fail")
-                return 50 - (value - self.stops[1]) / (self.stops[2] - self.stops[1]) * 50
-            else:
-                log.debug("definitely fail")
+        if value >= stops[-1]:
+            log.debug("fail")
             return 0
+        for i in range(0, len(stops) - 1):
+            if stops[i] <= value < stops[i+1]:
+                log.debug("at stop %d", i)
+                return 100 - ((value - stops[i]) / (stops[i+1] - stops[i]) + i) * 100 / (len(stops) - 1)
 
     def criticalcolor(self, value=None):
         healthscore = self.healthscore(value)

tests/test_healthscore.py

@@ -0,0 +1,56 @@
+import pytest
+
+from dashboard import Widget
+
+def test_healthscore_1_asc():
+    w = Widget(
+            {
+                "type": "gauge",
+                "stops": [1, 5],
+                "data": [ "605da6f41f58b122f41283823a99faa36286961a106ac901bb2b2d730fddc778" ] # required by API, not used for tests
+            }
+        )
+    # stops are ordered from best to worst
+    assert w.healthscore(0) == 100
+    assert w.healthscore(1) == 100
+    assert w.healthscore(2) ==  75
+    assert w.healthscore(3) ==  50
+    assert w.healthscore(4) ==  25
+    assert w.healthscore(5) ==   0
+    assert w.healthscore(6) ==   0
+
+
+def test_healthscore_2_asc():
+    w = Widget(
+            {
+                "type": "gauge",
+                "stops": [1, 10, 100],
+                "data": [ "605da6f41f58b122f41283823a99faa36286961a106ac901bb2b2d730fddc778" ] # required by API, not used for tests
+            }
+        )
+    # stops are ordered from best to worst
+    assert w.healthscore(0)    == 100
+    assert w.healthscore(1)    == 100
+    assert w.healthscore(5.5)  ==  75
+    assert w.healthscore(10)   ==  50
+    assert w.healthscore(55)   ==  25
+    assert w.healthscore(100)  ==   0
+    assert w.healthscore(1000) ==   0
+
+def test_healthscore_2_desc():
+    w = Widget(
+            {
+                "type": "gauge",
+                "stops": [100, 10, 1],
+                "data": [ "605da6f41f58b122f41283823a99faa36286961a106ac901bb2b2d730fddc778" ] # required by API, not used for tests
+            }
+        )
+    # stops are ordered from best to worst
+    assert w.healthscore(0)    ==   0
+    assert w.healthscore(1)    ==   0
+    assert w.healthscore(5.5)  ==  25
+    assert w.healthscore(10)   ==  50
+    assert w.healthscore(55)   ==  75
+    assert w.healthscore(100)  == 100
+    assert w.healthscore(1000) == 100
+