feat: Begins hvac system performance

Sources/ApiController/ApiController.swift

@@ -29,6 +29,11 @@ extension ApiController: DependencyKey {
       case let .calculateDehumidifierSize(request):
         logger.debug("Calculating dehumidifier size: \(request)")
         return try await request.respond(logger)
+
+      case let .calculateHVACSystemPerformance(request):
+        logger.debug("Calculating hvac system performance: \(request)")
+        fatalError()
+
       case let .calculateMoldRisk(request):
         logger.debug("Calculating mold risk: \(request)")
         return try await psychrometricClient.respond(request, logger)

Sources/ApiController/Extensions/DehumidifierSize.swift

@@ -46,6 +46,7 @@ public extension DehumidifierSize.Request {
 
     addDefaultWarnings(&warnings)
 
+    // TODO: Return an error if required capacity is larger than biggest residential dehumidifier.
     // TODO: Return early here ??
     if requiredCapacity > 205 {
       logger.debug("Required capacity exceeds residential unit.")
@@ -80,10 +81,15 @@ public extension DehumidifierSize.Request {
   }
 
   private func parseRecommendedSize(_ requiredCapacity: Double) -> (Int, String) {
-    for (key, value) in Self.dehumidifierSizes where Double(key) >= requiredCapacity {
-      return (key, value)
-    }
-    return (205, Self.dehumidifierSizes[205]!)
+    // TODO: Return an error if required capacity is larger than biggest residential dehumidifier.
+
+    // Ensure the keys are sorted, otherwise it gives unpredictable results.
+    let key = Self.dehumidifierSizes.keys.sorted()
+      .first { Double($0) >= requiredCapacity }
+      // Use the largest dehumidifier because the requirement is larger than the largest key.
+      ?? 255
+
+    return (key, Self.dehumidifierSizes[key]!)
   }
 
   private func addDefaultWarnings(_ warnings: inout [String]) {