From 0962ae290044d24722610234cb215b748722f196 Mon Sep 17 00:00:00 2001
From: cdricms <36056008+cdricms@users.noreply.github.com>
Date: Tue, 2 Sep 2025 21:09:42 +0200
Subject: [PATCH] Energy units

---
 Sources/Units/Units.swift | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/Sources/Units/Units.swift b/Sources/Units/Units.swift
index 15e7e55..406ab32 100644
--- a/Sources/Units/Units.swift
+++ b/Sources/Units/Units.swift
@@ -33,6 +33,7 @@ public enum UnitCategory: String, CaseIterable, CustomStringConvertible,
 	case time
 	case temperature
 	case speed
+	case energy
 	// Add more categories as needed
 
 	public var description: String {
@@ -102,6 +103,11 @@ public enum Unit: String, CaseIterable, CustomStringConvertible, Codable,
 	case milesPerHour = "mph"
 	case knots = "kn"
 
+	// MARK: Energy units
+	case joule = "J"
+	case kilocalorie = "kcal"
+	case kilojoule = "kJ"
+
 	public var category: UnitCategory {
 		switch self {
 		case .kilogram, .gram, .milligram, .microgram, .pound, .ounce,
@@ -119,6 +125,8 @@ public enum Unit: String, CaseIterable, CustomStringConvertible, Codable,
 		case .celsius, .fahrenheit, .kelvin: return .temperature
 		case .metersPerSecond, .kilometersPerHour, .milesPerHour, .knots:
 			return .speed
+		case .kilocalorie, .kilojoule, .joule:
+			return .energy
 		}
 	}
 
@@ -173,6 +181,12 @@ public enum Unit: String, CaseIterable, CustomStringConvertible, Codable,
 		case .kilometersPerHour: 1000.0 / 3600.0
 		case .milesPerHour: 1609.344 / 3600.0
 		case .knots: 0.514444
+
+		// Energy (Base: Joule)
+		case .joule: 1.0
+		case .kilojoule: 1000.0
+		case .kilocalorie: 4184.0
+
 		}
 	}
 
@@ -420,6 +434,7 @@ extension UnitCategory {
 		case .time: return .second
 		case .temperature: return .celsius
 		case .speed: return .metersPerSecond
+		case .energy: return .joule
 		}
 	}
 }
@@ -484,6 +499,11 @@ extension ConvertibleToDouble {
 	public var mph: UnitValue<Self> { .init(value: self, unit: .milesPerHour) }
 	public var kn: UnitValue<Self> { .init(value: self, unit: .knots) }
 
+	// MARK: Energy Initializers
+	public var J: UnitValue<Self> { .init(value: self, unit: .joule) }
+	public var kJ: UnitValue<Self> { .init(value: self, unit: .kilojoule) }
+	public var kcal: UnitValue<Self> { .init(value: self, unit: .kilocalorie) }
+
 	// MARK: - Subscripts for Numeric
 	/// Allows creating a UnitValue directly from a numeric literal using a Unit enum case.
 	/// Example: `10[.kg]`
@@ -557,6 +577,12 @@ extension UnitValue where ValueType: ConvertibleToDouble {  // Apply constraints
 	public var kmh: UnitValue<Double>? { converted(to: .kilometersPerHour) }
 	public var mph: UnitValue<Double>? { converted(to: .milesPerHour) }
 	public var kn: UnitValue<Double>? { converted(to: .knots) }
+
+	// MARK: Energy Conversions
+	public var J: UnitValue<Double>? { converted(to: .joule) }
+	public var kJ: UnitValue<Double>? { converted(to: .kilojoule) }
+	public var kcal: UnitValue<Double>? { converted(to: .kilocalorie) }
+
 }
 
 // MARK: - Height Conversion Extensions