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Nutrition Calculator Service\n// Calculates recipe nutrition by summing ingredient nutrition from FDC data\n\nimport { getFDCFoods } from \"./fdc-client.ts\";\nimport type { RecipeIngredient, RecipeNutrition, FDCNutrition, NutrientKey } from \"../../shared/types.ts\";\nimport { ALL_NUTRIENT_KEYS } from \"../../shared/types.ts\";\n\n// Unit conversion factors to grams\nconst UNIT_TO_GRAMS: Record = {\n 'g': 1,\n 'gram': 1,\n 'grams': 1,\n 'kg': 1000,\n 'kilogram': 1000,\n 'oz': 28.3495,\n 'ounce': 28.3495,\n 'ounces': 28.3495,\n 'lb': 453.592,\n 'lbs': 453.592,\n 'pound': 453.592,\n 'pounds': 453.592,\n 'ml': 1, // Approximate, assumes density of water\n 'milliliter': 1,\n 'milliliters': 1,\n 'l': 1000,\n 'liter': 1000,\n 'liters': 1000,\n // Common cooking measurements (approximate, for water-like liquids)\n 'cup': 236.588,\n 'cups': 236.588,\n 'tbsp': 14.787,\n 'tablespoon': 14.787,\n 'tablespoons': 14.787,\n 'tsp': 4.929,\n 'teaspoon': 4.929,\n 'teaspoons': 4.929,\n};\n\n// Convert amount + unit to grams\nexport function convertToGrams(amount: number | null, unit: string | null): number | null {\n if (amount === null) return null;\n if (!unit) return null; // Don't assume grams if no unit\n\n const normalizedUnit = unit.toLowerCase().trim();\n const factor = UNIT_TO_GRAMS[normalizedUnit];\n\n if (factor !== undefined) {\n return amount * factor;\n }\n\n // Handle units like \"2 cups\" where the unit includes a number\n const match = normalizedUnit.match(/^(\\d+(?:\\.\\d+)?)\\s*(.+)$/);\n if (match) {\n const [, numStr, baseUnit] = match;\n const baseFactor = UNIT_TO_GRAMS[baseUnit.trim()];\n if (baseFactor !== undefined) {\n return amount * parseFloat(numStr) * baseFactor;\n }\n }\n\n // For unknown units (like \"piece\", \"whole\", etc.), return null\n // These will need FDC portion data for accurate conversion\n return null;\n}\n\n// Create empty nutrition object with all nutrient keys\nfunction createEmptyNutrition(): Omit & { isComplete: boolean } {\n const nutrition: Record = { isComplete: false };\n for (const key of ALL_NUTRIENT_KEYS) {\n nutrition[key] = null;\n }\n return nutrition as Omit & { isComplete: boolean };\n}\n\n// Scale nutrition values by a factor (amountGrams / 100)\nfunction scaleNutrition(nutrition: FDCNutrition, factor: number): Partial {\n const scaled: Partial = {};\n\n for (const key of ALL_NUTRIENT_KEYS) {\n const value = nutrition[key];\n if (value !== null && value !== undefined) {\n (scaled as any)[key] = value * factor;\n }\n }\n\n return scaled;\n}\n\n// Sum nutrition values\nfunction sumNutrition(\n total: Partial>,\n toAdd: Partial\n): void {\n for (const key of ALL_NUTRIENT_KEYS) {\n const value = (toAdd as any)[key];\n if (value !== null && value !== undefined) {\n (total as any)[key] = ((total as any)[key] || 0) + value;\n }\n }\n}\n\nexport interface CalculatedNutrition {\n nutrition: Omit;\n linkedCount: number;\n totalCount: number;\n unlinkedIngredients: string[];\n}\n\n// Calculate recipe nutrition from ingredients\nexport async function calculateRecipeNutrition(\n ingredients: RecipeIngredient[],\n servingSize: number\n): Promise {\n if (ingredients.length === 0) {\n return {\n nutrition: { ...createEmptyNutrition(), isComplete: true },\n linkedCount: 0,\n totalCount: 0,\n unlinkedIngredients: [],\n };\n }\n\n // Collect FDC IDs that need to be fetched\n const fdcIds = ingredients\n .filter(i => i.fdcId !== null)\n .map(i => i.fdcId as number);\n\n // Fetch all FDC foods at once\n const fdcFoods = fdcIds.length > 0 ? await getFDCFoods(fdcIds) : new Map();\n\n const totalNutrition: Partial> = {};\n const unlinkedIngredients: string[] = [];\n const incalculableIngredients: string[] = [];\n let linkedCount = 0;\n\n for (const ingredient of ingredients) {\n // Check if ingredient has FDC link\n if (!ingredient.fdcId) {\n unlinkedIngredients.push(ingredient.name);\n continue;\n }\n\n const fdcFood = fdcFoods.get(ingredient.fdcId);\n if (!fdcFood) {\n unlinkedIngredients.push(ingredient.name);\n continue;\n }\n\n // Get amount in grams\n let amountGrams = ingredient.amountGrams;\n\n // If no pre-calculated grams, try to convert\n if (amountGrams === null && ingredient.amount !== null) {\n amountGrams = convertToGrams(ingredient.amount, ingredient.unit);\n }\n\n // If still no amount, use FDC serving size as default\n if (amountGrams === null) {\n if (fdcFood.servingSize && fdcFood.servingSizeUnit?.toLowerCase() === 'g') {\n amountGrams = fdcFood.servingSize * (ingredient.amount || 1);\n }\n else {\n // Can't calculate without amount\n incalculableIngredients.push(ingredient.name);\n continue;\n }\n }\n\n // FDC nutrition is per 100g, scale by actual amount\n const scaleFactor = amountGrams / 100;\n const scaledNutrition = scaleNutrition(fdcFood.nutrition, scaleFactor);\n sumNutrition(totalNutrition, scaledNutrition);\n\n linkedCount++;\n }\n\n // Divide by serving size to get per-serving values\n const perServing: Partial> = {};\n for (const key of ALL_NUTRIENT_KEYS) {\n const value = (totalNutrition as any)[key];\n if (value !== undefined) {\n (perServing as any)[key] = value / servingSize;\n } else {\n (perServing as any)[key] = null;\n }\n }\n\n const isComplete = unlinkedIngredients.length === 0 && ingredients.length > 0;\n\n // Build result with all nutrient keys\n const resultNutrition: any = { isComplete };\n for (const key of ALL_NUTRIENT_KEYS) {\n resultNutrition[key] = (perServing as any)[key] ?? null;\n }\n\n return {\n nutrition: resultNutrition,\n linkedCount,\n totalCount: ingredients.length,\n unlinkedIngredients,\n };\n}\n\n// Recalculate nutrition when serving size changes\nexport function recalculateForServingSize(\n originalNutrition: RecipeNutrition,\n originalServingSize: number,\n newServingSize: number\n): Omit {\n if (originalServingSize === newServingSize) {\n return { ...originalNutrition };\n }\n\n const factor = originalServingSize / newServingSize;\n\n const result: any = { isComplete: originalNutrition.isComplete };\n for (const key of ALL_NUTRIENT_KEYS) {\n const value = (originalNutrition as any)[key];\n if (value !== null) {\n result[key] = value * factor;\n } else {\n result[key] = null;\n }\n }\n\n return result as Omit;\n}\n","deleted","label",[175,176,157],"backend","services","permalink","https://www.val.town/x/shapedlines/carmy/code/backend/services/nutrition-calculator.ts","extension","actionData","errors"]