added implementation frontend by prompt @ 2026-02-14 05:35:18 #CODEX

frontend/src/utils/nutrition.ts

@@ -0,0 +1,83 @@
+import type {
+	DayMealsByType,
+	Ingredient,
+	Meal,
+	MealItem,
+	NutritionTotals,
+} from '@/types/domain'
+
+const round2 = (value: number): number => Math.round(value * 100) / 100
+
+export const emptyTotals = (): NutritionTotals => ({
+	protein_g: 0,
+	carbs_g: 0,
+	sugar_g: 0,
+	fat_g: 0,
+	fiber_g: 0,
+	kcal: 0,
+})
+
+export const computeItemNutrition = (ingredient: Ingredient, grams: number): NutritionTotals => {
+	const factor = grams / 100
+	const protein = round2(ingredient.protein_g_100 * factor)
+	const carbs = round2(ingredient.carbs_g_100 * factor)
+	const sugar = round2(ingredient.sugar_g_100 * factor)
+	const fat = round2(ingredient.fat_g_100 * factor)
+	const fiber = round2(ingredient.fiber_g_100 * factor)
+	const kcal = round2(protein * 4 + carbs * 4 + fat * 9)
+
+	return {
+		protein_g: protein,
+		carbs_g: carbs,
+		sugar_g: sugar,
+		fat_g: fat,
+		fiber_g: fiber,
+		kcal,
+	}
+}
+
+export const addTotals = (base: NutritionTotals, add: NutritionTotals): NutritionTotals => {
+	return {
+		protein_g: round2(base.protein_g + add.protein_g),
+		carbs_g: round2(base.carbs_g + add.carbs_g),
+		sugar_g: round2(base.sugar_g + add.sugar_g),
+		fat_g: round2(base.fat_g + add.fat_g),
+		fiber_g: round2(base.fiber_g + add.fiber_g),
+		kcal: round2(base.kcal + add.kcal),
+	}
+}
+
+export const computeMealTotals = (items: MealItem[]): NutritionTotals => {
+	let totals = emptyTotals()
+
+	for (const item of items) {
+		if (!item.ingredient || item.grams <= 0) {
+			continue
+		}
+		const itemTotals = computeItemNutrition(item.ingredient, item.grams)
+		totals = addTotals(totals, itemTotals)
+	}
+
+	return totals
+}
+
+export const computeDayTotals = (mealsByType: Partial<DayMealsByType>): NutritionTotals => {
+	let totals = emptyTotals()
+
+	for (const meal of Object.values(mealsByType)) {
+		if (!meal) {
+			continue
+		}
+		const mealTotals = computeMealTotals(meal.items ?? [])
+		totals = addTotals(totals, mealTotals)
+	}
+
+	return totals
+}
+
+export const withComputedMealTotals = (meal: Meal): Meal => {
+	return {
+		...meal,
+		totals: computeMealTotals(meal.items ?? []),
+	}
+}