129 lines
5.0 KiB
PHP
129 lines
5.0 KiB
PHP
<?php
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namespace App\Services;
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use App\Enums\PacePreference;
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use App\Enums\PhysicalActivityLevel;
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use App\Enums\UserSex;
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use App\Enums\WeightGoal;
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use Carbon\CarbonInterface;
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use InvalidArgumentException;
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class NutritionPlanCalculator
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{
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public const FORMULA_VERSION = 'mifflin_st_jeor_v1';
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/**
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* @return array{
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* formula_version: string,
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* calories: int,
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* proteins: float,
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* carbs: float,
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* fats: float,
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* resting_metabolism: int,
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* maintenance_calories: int,
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* calorie_adjustment_percent: float,
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* calculation_details: array<string, float|int|string>
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* }
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*/
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public function calculate(
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float $weightKg,
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int $heightCm,
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CarbonInterface $dateOfBirth,
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UserSex $sex,
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PhysicalActivityLevel $activityLevel,
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WeightGoal $weightGoal,
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PacePreference $pacePreference,
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): array {
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$sexCoefficient = match ($sex) {
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UserSex::MAN => 5,
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UserSex::WOMAN => -161,
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default => throw new InvalidArgumentException('A metabolic calculation reference is required.'),
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};
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$age = (int) $dateOfBirth->diffInYears(now());
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$restingMetabolism = (int) round(
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(10 * $weightKg) + (6.25 * $heightCm) - (5 * $age) + $sexCoefficient
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);
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$activityFactor = $this->activityFactor($activityLevel);
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$maintenanceCalories = (int) (round(($restingMetabolism * $activityFactor) / 10) * 10);
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$adjustmentPercent = $this->calorieAdjustmentPercent($weightGoal, $pacePreference);
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$unboundedCalories = (int) (round(($maintenanceCalories * (1 + $adjustmentPercent)) / 10) * 10);
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$minimumCalories = max(1200, (int) (ceil(($restingMetabolism * 0.8) / 10) * 10));
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$calorieTarget = max($minimumCalories, $unboundedCalories);
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$heightMeters = $heightCm / 100;
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$proteinReferenceWeight = min($weightKg, 25 * ($heightMeters ** 2));
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$proteinFactor = $this->proteinFactor($activityLevel, $weightGoal);
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$proteins = max(1, (int) round($proteinReferenceWeight * $proteinFactor));
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$fats = max(1, (int) round(($calorieTarget * 0.25) / 9));
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$carbs = max(0, (int) round(($calorieTarget - ($proteins * 4) - ($fats * 9)) / 4));
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$macroCalories = ($proteins * 4) + ($carbs * 4) + ($fats * 9);
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return [
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'formula_version' => self::FORMULA_VERSION,
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'calories' => $macroCalories,
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'proteins' => $proteins,
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'carbs' => $carbs,
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'fats' => $fats,
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'resting_metabolism' => $restingMetabolism,
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'maintenance_calories' => $maintenanceCalories,
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'calorie_adjustment_percent' => $adjustmentPercent,
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'calculation_details' => [
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'activityFactor' => $activityFactor,
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'ageAtCalculation' => $age,
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'heightCm' => $heightCm,
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'inputWeightKg' => round($weightKg, 2),
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'minimumCalories' => $minimumCalories,
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'pacePreference' => $pacePreference->value,
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'proteinFactor' => $proteinFactor,
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'proteinReferenceWeightKg' => round($proteinReferenceWeight, 2),
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'sexReference' => $sex->value,
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'weightGoal' => $weightGoal->value,
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],
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];
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}
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private function activityFactor(PhysicalActivityLevel $activityLevel): float
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{
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return match ($activityLevel) {
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PhysicalActivityLevel::SEDENTARY => 1.2,
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PhysicalActivityLevel::LIGHTLY_ACTIVE => 1.375,
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PhysicalActivityLevel::MODERATELY_ACTIVE => 1.55,
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PhysicalActivityLevel::VERY_ACTIVE => 1.725,
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PhysicalActivityLevel::ATHLETE => 1.9,
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};
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}
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private function calorieAdjustmentPercent(WeightGoal $weightGoal, PacePreference $pacePreference): float
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{
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if ($weightGoal === WeightGoal::MAINTAIN_WEIGHT) {
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return 0;
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}
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$magnitude = match ($pacePreference) {
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PacePreference::SLOW => $weightGoal === WeightGoal::LOSE_WEIGHT ? 0.10 : 0.05,
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PacePreference::NORMAL => $weightGoal === WeightGoal::LOSE_WEIGHT ? 0.15 : 0.10,
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PacePreference::FAST => $weightGoal === WeightGoal::LOSE_WEIGHT ? 0.20 : 0.15,
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};
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return $weightGoal === WeightGoal::LOSE_WEIGHT ? -$magnitude : $magnitude;
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}
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private function proteinFactor(PhysicalActivityLevel $activityLevel, WeightGoal $weightGoal): float
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{
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$factor = match ($activityLevel) {
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PhysicalActivityLevel::SEDENTARY => 1.2,
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PhysicalActivityLevel::LIGHTLY_ACTIVE => 1.4,
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PhysicalActivityLevel::MODERATELY_ACTIVE => 1.6,
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PhysicalActivityLevel::VERY_ACTIVE, PhysicalActivityLevel::ATHLETE => 1.8,
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};
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$factor += match ($weightGoal) {
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WeightGoal::LOSE_WEIGHT => 0.2,
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WeightGoal::GAIN_WEIGHT => 0.1,
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WeightGoal::MAINTAIN_WEIGHT => 0,
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};
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return min($factor, 2.0);
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}
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}
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