feat: Refactoring climate zone.

Sources/Routes/Models/ClimateZone.swift

@@ -1,33 +1,67 @@
-public enum ClimateZone: String, CaseIterable, Codable, Equatable, Sendable {
-  // NOTE: Keep in this order.
+// TODO: This should be renamed to ClimateZoneType.
 
-  case hotHumid
-  case moist
-  case dry
-  case marine
+public enum ClimateZone {
 
-  public var zoneIdentifiers: [String] {
-    switch self {
-    case .dry:
-      return ["2B", "3B", "4B", "5B", "6B", "7B"]
-    case .hotHumid:
-      return ["1A", "2A"]
-    case .marine:
-      return ["3C", "4C"]
-    case .moist:
-      return ["3A", "4A", "5A", "6A", "7A"]
+  public enum ZoneType: String, CaseIterable, Codable, Equatable, Sendable {
+    // NOTE: Keep in this order.
+
+    case hotHumid
+    case moist
+    case dry
+    case marine
+
+    // FIX: Return ZoneIdentifiers.
+    public var zoneIdentifiers: [String] {
+      switch self {
+      case .dry:
+        return ["2B", "3B", "4B", "5B", "6B", "7B"]
+      case .hotHumid:
+        return ["1A", "2A"]
+      case .marine:
+        return ["3C", "4C"]
+      case .moist:
+        return ["3A", "4A", "5A", "6A", "7A"]
+      }
     }
-  }
 
-  public var cfmPerTon: Int {
-    switch self {
-    case .dry: return 450
-    case .hotHumid: return 350
-    case .marine, .moist: return 400
+    public var cfmPerTon: Int {
+      switch self {
+      case .dry: return 450
+      case .hotHumid: return 350
+      case .marine, .moist: return 400
+      }
     }
-  }
 
-  public var label: String {
-    return "\(self == .hotHumid ? "Hot Humid" : rawValue.capitalized) (\(zoneIdentifiers.joined(separator: ", ")))"
+    public var label: String {
+      return "\(self == .hotHumid ? "Hot Humid" : rawValue.capitalized) (\(zoneIdentifiers.joined(separator: ", ")))"
+    }
+
+    /// Represents climate zone identifiers.
+    public enum ZoneIdentifier: String, CaseIterable, Codable, Equatable, Sendable {
+      // A zones (hotHumid)
+      case oneA = "1A"
+      case twoA = "2A"
+      // A zones (moist)
+      case threeA = "3A"
+      case fourA = "4A"
+      case fiveA = "5A"
+      case sixA = "6A"
+      case sevenA = "7A"
+
+      // B zones (dry)
+      case twoB = "2B"
+      case threeB = "3B"
+      case fourB = "4B"
+      case fiveB = "5B"
+      case sixB = "6B"
+      case sevenB = "7B"
+
+      // C zones (marine)
+      case threeC = "3C"
+      case fourC = "4C"
+
+      public var label: String { rawValue }
+
+    }
   }
 }

Sources/Routes/Models/FilterPressureDrop.swift

@@ -16,14 +16,14 @@ public enum FilterPressureDrop {
     public struct Basic: Codable, Equatable, Sendable {
 
       public let systemSize: Double
-      public let climateZone: ClimateZone
+      public let climateZone: ClimateZone.ZoneType
       public let filterType: FilterType
       public let filterWidth: Double
       public let filterHeight: Double
 
       public init(
         systemSize: Double,
-        climateZone: ClimateZone,
+        climateZone: ClimateZone.ZoneType,
         filterType: FilterPressureDrop.FilterType,
         filterWidth: Double,
         filterHeight: Double