feat: Initial commit

Sources/ManualS/Internal/Derating.swift

@@ -0,0 +1,101 @@
+import Models
+
+extension Derating.Request {
+  func respond() async throws -> Derating.Response {
+    switch systemType {
+    case .airToAir:
+      return .init(
+        coolingTotal: totalWetDerating(elevation: elevation),
+        coolingSensible: sensibleWetDerating(elevation: elevation),
+        heating: totalDryDerating(elevation: elevation)
+      )
+
+    case let .heatingOnly(type: type):
+      switch type {
+      case .boiler, .furnace:
+        return .init(heating: furnaceDerating(elevation: elevation))
+      case .electric:
+        return .init(heating: 1)
+      }
+    }
+  }
+}
+
+// swiftlint:disable cyclomatic_complexity
+private func furnaceDerating(elevation: Int) -> Double {
+  guard elevation > 0 else { return 1 }
+
+  if (0 ..< 1000).contains(elevation) { return 1 }
+  if (1000 ..< 2000).contains(elevation) { return 0.96 }
+  if (2000 ..< 3000).contains(elevation) { return 0.92 }
+  if (3000 ..< 4000).contains(elevation) { return 0.88 }
+  if (4000 ..< 5000).contains(elevation) { return 0.84 }
+  if (5000 ..< 6000).contains(elevation) { return 0.8 }
+  if (6000 ..< 7000).contains(elevation) { return 0.76 }
+  if (7000 ..< 8000).contains(elevation) { return 0.72 }
+  if (8000 ..< 9000).contains(elevation) { return 0.68 }
+  if (9000 ..< 10000).contains(elevation) { return 0.64 }
+  if (10000 ..< 11000).contains(elevation) { return 0.6 }
+  if (11000 ..< 12000).contains(elevation) { return 0.56 }
+  // greater than 12,000 feet in elevation.
+  return 0.52
+}
+
+private func totalWetDerating(elevation: Int) -> Double {
+  guard elevation > 0 else { return 1 }
+
+  if (0 ..< 1000).contains(elevation) { return 1 }
+  if (1000 ..< 2000).contains(elevation) { return 0.99 }
+  if (2000 ..< 3000).contains(elevation) { return 0.98 }
+  if (3000 ..< 4000).contains(elevation) { return 0.98 }
+  if (4000 ..< 5000).contains(elevation) { return 0.97 }
+  if (5000 ..< 6000).contains(elevation) { return 0.96 }
+  if (6000 ..< 7000).contains(elevation) { return 0.95 }
+  if (7000 ..< 8000).contains(elevation) { return 0.94 }
+  if (8000 ..< 9000).contains(elevation) { return 0.94 }
+  if (9000 ..< 10000).contains(elevation) { return 0.93 }
+  if (10000 ..< 11000).contains(elevation) { return 0.92 }
+  if (11000 ..< 12000).contains(elevation) { return 0.91 }
+  // greater than 12,000 feet in elevation.
+  return 0.9
+}
+
+private func sensibleWetDerating(elevation: Int) -> Double {
+  guard elevation > 0 else { return 1 }
+
+  if (0 ..< 1000).contains(elevation) { return 1 }
+  if (1000 ..< 2000).contains(elevation) { return 0.97 }
+  if (2000 ..< 3000).contains(elevation) { return 0.94 }
+  if (3000 ..< 4000).contains(elevation) { return 0.91 }
+  if (4000 ..< 5000).contains(elevation) { return 0.88 }
+  if (5000 ..< 6000).contains(elevation) { return 0.85 }
+  if (6000 ..< 7000).contains(elevation) { return 0.82 }
+  if (7000 ..< 8000).contains(elevation) { return 0.8 }
+  if (8000 ..< 9000).contains(elevation) { return 0.77 }
+  if (9000 ..< 10000).contains(elevation) { return 0.74 }
+  if (10000 ..< 11000).contains(elevation) { return 0.71 }
+  if (11000 ..< 12000).contains(elevation) { return 0.68 }
+  // greater than 12,000 feet in elevation.
+  return 0.65
+}
+
+private func totalDryDerating(elevation: Int) -> Double {
+  guard elevation > 0 else { return 1 }
+
+  if (0 ..< 1000).contains(elevation) { return 1 }
+  if (1000 ..< 2000).contains(elevation) { return 0.98 }
+  if (2000 ..< 3000).contains(elevation) { return 0.97 }
+  if (3000 ..< 4000).contains(elevation) { return 0.95 }
+  if (4000 ..< 5000).contains(elevation) { return 0.94 }
+  if (5000 ..< 6000).contains(elevation) { return 0.92 }
+  if (6000 ..< 7000).contains(elevation) { return 0.9 }
+  if (7000 ..< 8000).contains(elevation) { return 0.89 }
+  if (8000 ..< 9000).contains(elevation) { return 0.87 }
+  if (9000 ..< 10000).contains(elevation) { return 0.86 }
+  if (10000 ..< 11000).contains(elevation) { return 0.84 }
+  if (11000 ..< 12000).contains(elevation) { return 0.82 }
+  // greater than 12,000 feet in elevation.
+  return 0.81
+}
+
+// swiftlint:enable cyclomatic_complexity