feat: Initial filter pressure drop views, calculations need implemented.

Sources/Routes/Models/ClimateZone.swift

@@ -1,8 +1,10 @@
-public enum ClimateZone: String, Codable, Equatable, Sendable {
-  case dry
+public enum ClimateZone: String, CaseIterable, Codable, Equatable, Sendable {
+  // NOTE: Keep in this order.
+
   case hotHumid
-  case marine
   case moist
+  case dry
+  case marine
 
   public var zoneIdentifiers: [String] {
     switch self {
@@ -26,6 +28,6 @@ public enum ClimateZone: String, Codable, Equatable, Sendable {
   }
 
   public var label: String {
-    return "\(rawValue.capitalized) (\(zoneIdentifiers.joined(separator: ",")))"
+    return "\(self == .hotHumid ? "Hot Humid" : rawValue.capitalized) (\(zoneIdentifiers.joined(separator: ", ")))"
   }
 }

Sources/Routes/Models/FilterPressureDrop.swift

@@ -4,20 +4,25 @@ public enum FilterPressureDrop {
   Calculate filter pressure drop and sizing based on system requirements.
   """
 
+  public enum Mode: String, CaseIterable, Codable, Equatable, Sendable {
+    case basic
+    case fanLaw
+  }
+
   public enum Request: Codable, Equatable, Sendable {
     case basic(Basic)
     case fanLaw(FanLaw)
 
     public struct Basic: Codable, Equatable, Sendable {
 
-      let systemSize: HVACSystemSize
+      let systemSize: Double
       let climateZone: ClimateZone
       let filterType: FilterType
       let filterWidth: Double
       let filterHeight: Double
 
       public init(
-        systemSize: HVACSystemSize,
+        systemSize: Double,
         climateZone: ClimateZone,
         filterType: FilterPressureDrop.FilterType,
         filterWidth: Double,
@@ -58,22 +63,30 @@ public enum FilterPressureDrop {
     }
   }
 
-  public enum Result: Codable, Equatable, Sendable {
+  public enum Response: Codable, Equatable, Sendable {
     case basic(Basic)
     case fanLaw(FanLaw)
 
     public struct Basic: Codable, Equatable, Sendable {
 
-      let filterArea: Double
-      let feetPerMinute: Double
-      let initialPressureDrop: Double
-      let maxPressureDrop: Double
+      public let filterArea: Double
+      public let feetPerMinute: Double
+      public let initialPressureDrop: Double
+      public let maxPressureDrop: Double
+      public let warnings: [String]
 
-      public init(filterArea: Double, feetPerMinute: Double, initialPressureDrop: Double, maxPressureDrop: Double) {
+      public init(
+        filterArea: Double,
+        feetPerMinute: Double,
+        initialPressureDrop: Double,
+        maxPressureDrop: Double,
+        warnings: [String]
+      ) {
         self.filterArea = filterArea
         self.feetPerMinute = feetPerMinute
         self.initialPressureDrop = initialPressureDrop
         self.maxPressureDrop = maxPressureDrop
+        self.warnings = warnings
       }
     }
 
@@ -98,7 +111,7 @@ public enum FilterPressureDrop {
     }
   }
 
-  public enum FilterType: String, Codable, Equatable, Sendable {
+  public enum FilterType: String, CaseIterable, Codable, Equatable, Sendable {
     case fiberglass
     case pleatedBasic
     case pleatedBetter
@@ -114,3 +127,34 @@ public enum FilterPressureDrop {
     }
   }
 }
+
+#if DEBUG
+  public extension FilterPressureDrop.Response {
+
+    static func mock(mode: FilterPressureDrop.Mode) -> Self {
+      switch mode {
+      case .basic:
+        return .basic(.init(
+          filterArea: 3.47,
+          feetPerMinute: 230,
+          initialPressureDrop: 0.2,
+          maxPressureDrop: 0.15,
+          warnings: [
+            """
+            Intial pressure drop is more than 50% of maximum allowable.
+            Consider using a larger filter or different type with lower intial pressure drop.
+            """
+          ]
+        ))
+      case .fanLaw:
+        return .fanLaw(.init(
+          predictedPressureDrop: 0.127,
+          velocityRatio: 1.13,
+          pressureRatio: 1.27,
+          faceVelocity: 259
+        ))
+      }
+    }
+
+  }
+#endif

Sources/Routes/Models/HVACSystemSize.swift

@@ -1,4 +1,4 @@
-public enum HVACSystemSize: Double, Codable, Equatable, Sendable {
+public enum HVACSystemSize: Double, CaseIterable, Codable, Equatable, Sendable {
   case one = 1
   case oneAndAHalf = 1.5
   case two = 2