Rearrange thresholds to be pair based

It was pointed out in another review that the way the dbus interfaces
are set up, they are all pair-wise, with a positive and negative end
of the interface.  This changes the data structures to match that
reality, inventing a "ThresholdDefinition" object.  This reduces the
code, and allows us to promote the level definitions up to a higher
scope in the structure.

This greatly simplifies the thresProp structure to remove a number of
elements that were redundant, and allows adding new thresholds easier
in the future.

Tested: Tested on Vegman system;  Thresholds work as designed.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: Ic9d5ba8282f78fe928689cb7fbd98d575a570200
diff --git a/include/Thresholds.hpp b/include/Thresholds.hpp
index 50075a2..fb266d0 100644
--- a/include/Thresholds.hpp
+++ b/include/Thresholds.hpp
@@ -112,7 +112,7 @@
     std::list<TimerPair> timers;
 };
 
-bool findOrder(Level lev, Direction dir);
+bool isValidLevel(Level lev);
 
 bool parseThresholdsFromConfig(
     const SensorData& sensorData,
@@ -124,6 +124,19 @@
                              const double& scaleFactor,
                              const double& offset = 0);
 
+struct ThresholdDefinition
+{
+    Level level;
+    uint8_t sevOrder;
+    const char* levelName;
+};
+
+constexpr static std::array<thresholds::ThresholdDefinition, 4> thresProp = {
+    {{Level::WARNING, 0, "Warning"},
+     {Level::CRITICAL, 1, "Critical"},
+     {Level::SOFTSHUTDOWN, 2, "SoftShutdown"},
+     {Level::HARDSHUTDOWN, 3, "HardShutdown"}}};
+
 std::string getInterface(const Level level);
 
 void persistThreshold(const std::string& baseInterface, const std::string& path,
diff --git a/include/sensor.hpp b/include/sensor.hpp
index 25e28fd..40f4223 100644
--- a/include/sensor.hpp
+++ b/include/sensor.hpp
@@ -94,39 +94,15 @@
     // construction of your Sensor subclass. See ExternalSensor for example.
     std::function<void()> externalSetHook;
 
-    struct ThresholdProperty
-    {
-        thresholds::Level level;
-        thresholds::Direction direction;
-        uint8_t sevOrder;
-        const char* levelProperty;
-        const char* alarmProperty;
-        const char* dirOrder;
-    };
+    using Level = thresholds::Level;
+    using Direction = thresholds::Direction;
 
-    constexpr static std::array<ThresholdProperty, 8> thresProp = {
-        {{thresholds::Level::WARNING, thresholds::Direction::HIGH, 0,
-          "WarningHigh", "WarningAlarmHigh", "greater than"},
-         {thresholds::Level::WARNING, thresholds::Direction::LOW, 0,
-          "WarningLow", "WarningAlarmLow", "less than"},
-         {thresholds::Level::CRITICAL, thresholds::Direction::HIGH, 1,
-          "CriticalHigh", "CriticalAlarmHigh", "greater than"},
-         {thresholds::Level::CRITICAL, thresholds::Direction::LOW, 1,
-          "CriticalLow", "CriticalAlarmLow", "less than"},
-         {thresholds::Level::SOFTSHUTDOWN, thresholds::Direction::HIGH, 2,
-          "SoftShutdownHigh", "SoftShutdownAlarmHigh", "greater than"},
-         {thresholds::Level::SOFTSHUTDOWN, thresholds::Direction::LOW, 2,
-          "SoftShutdownLow", "SoftShutdownAlarmLow", "less than"},
-         {thresholds::Level::HARDSHUTDOWN, thresholds::Direction::HIGH, 3,
-          "HardShutdownHigh", "HardShutdownAlarmHigh", "greater than"},
-         {thresholds::Level::HARDSHUTDOWN, thresholds::Direction::LOW, 3,
-          "HardShutdownLow", "HardShutdownAlarmLow", "less than"}}};
-
-    std::array<std::shared_ptr<sdbusplus::asio::dbus_interface>, 4>
+    std::array<std::shared_ptr<sdbusplus::asio::dbus_interface>,
+               thresholds::thresProp.size()>
         thresholdInterfaces;
 
     std::shared_ptr<sdbusplus::asio::dbus_interface>
-        getThresholdInterface(thresholds::Level lev)
+        getThresholdInterface(Level lev)
     {
         size_t index = static_cast<size_t>(lev);
         if (index >= thresholdInterfaces.size())
@@ -287,7 +263,7 @@
             {
                 threshold.hysteresis = hysteresisTrigger;
             }
-            if (!(thresholds::findOrder(threshold.level, threshold.direction)))
+            if (!thresholds::isValidLevel(threshold.level))
             {
                 continue;
             }
@@ -395,27 +371,41 @@
         }
     }
 
-    std::string propertyLevel(const thresholds::Level lev,
-                              const thresholds::Direction dir)
+    std::string propertyLevel(const Level lev, const Direction dir)
     {
-        for (ThresholdProperty prop : thresProp)
+        for (const thresholds::ThresholdDefinition& prop :
+             thresholds::thresProp)
         {
-            if ((prop.level == lev) && (prop.direction == dir))
+            if (prop.level == lev)
             {
-                return prop.levelProperty;
+                if (dir == Direction::HIGH)
+                {
+                    return std::string(prop.levelName) + "High";
+                }
+                if (dir == Direction::LOW)
+                {
+                    return std::string(prop.levelName) + "Low";
+                }
             }
         }
         return "";
     }
 
-    std::string propertyAlarm(const thresholds::Level lev,
-                              const thresholds::Direction dir)
+    std::string propertyAlarm(const Level lev, const Direction dir)
     {
-        for (ThresholdProperty prop : thresProp)
+        for (const thresholds::ThresholdDefinition& prop :
+             thresholds::thresProp)
         {
-            if ((prop.level == lev) && (prop.direction == dir))
+            if (prop.level == lev)
             {
-                return prop.alarmProperty;
+                if (dir == Direction::HIGH)
+                {
+                    return std::string(prop.levelName) + "AlarmHigh";
+                }
+                if (dir == Direction::LOW)
+                {
+                    return std::string(prop.levelName) + "AlarmLow";
+                }
             }
         }
         return "";