Water percentages

Sources/OpenFoodFacts/Schemas/Product.swift

@@ -1,3 +1,5 @@
+import Units
+
 public class Product: Codable, ObjectDebugger {
 	// public var images: Images? = Images()
 	public var ingredients: [Ingredient]? = []
@@ -200,6 +202,23 @@ public class Product: Codable, ObjectDebugger {
 	public var vitaminsPrevTags: [String]?
 	public var vitaminsTags: [String]?
 
+	public var waterQuantity: Units.UnitValue<Double>? {
+		guard let ingredient = ingredients?.first(where: { $0.isWater })
+		else {
+			return nil
+		}
+
+		guard let quantity = productQuantity,
+			let estimate = ingredient.percentEstimate,
+			let rawUnit = productQuantityUnit,
+			let unit = Units.Unit(rawValue: rawUnit)
+		else {
+			return nil
+		}
+
+		return Double(quantity * (estimate / 100))[unit]
+	}
+
 	private enum CodingKeys: String, CodingKey {
 		// case images
 		case ingredients