20: Use resolver in PriceAlarm

src/main/tjava/com/r35157/jupiterperpsalarm/impl/ref/PriceAlarm.tjava

@@ -5,8 +5,13 @@ import java.time.Instant;
 
 public final class PriceAlarm {
 
-    public PriceAlarm(PriceAlarmDefinition definition, AlarmAction action) {
+    public PriceAlarm(
+            PriceAlarmDefinition definition,
+            AlarmVariableResolver variableResolver,
+            AlarmAction action
+    ) {
         this.definition = definition;
+        this.variableResolver = variableResolver;
         this.action = action;
     }
 
@@ -17,7 +22,10 @@ public final class PriceAlarm {
             );
         }
 
-        BigDecimal target = AlarmTargetParser.parse(definition.targetExpression());
+        BigDecimal target = AlarmTargetParser.parse(
+                variableResolver.resolve(definition.targetExpression())
+        );
+
         boolean reached = definition.direction().reached(
                 price.priceUsd(),
                 target
@@ -84,6 +92,7 @@ public final class PriceAlarm {
     }
 
     private final PriceAlarmDefinition definition;
+    private final AlarmVariableResolver variableResolver;
     private final AlarmAction action;
 
     private Instant lastTriggeredAt;