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kcal
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Move nutrient calculation to a support class

This commit is contained in:
Christopher C. Wells 2021-01-02 15:13:36 -08:00
parent 3bc346848c
commit 2e7233b3b9
2 changed files with 54 additions and 37 deletions
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43
app/Models/FoodAmount.php
View File

@ -2,6 +2,7 @@
namespace App\Models;
use App\Support\NutrientCalculator;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
@ -86,46 +87,14 @@ class FoodAmount extends Model
*/
public function __call($method, $parameters): mixed {
if (in_array($method, $this->nutrientMethods)) {
return $this->food->{$method} * $this->unitMultiplier();
return $this->food->{$method} * NutrientCalculator::calculateFoodNutrientMultiplier(
$this->food,
$this->amount,
$this->unit
);
}
else {
return parent::__call($method, $parameters);
}
}
/**
* Get the multiplier for nutrient calculations based on serving data.
*/
private function unitMultiplier(): float {
if ($this->unit === 'oz') {
return $this->amount * 28.349523125 / $this->food->serving_weight;
}
if ($this->food->serving_unit === $this->unit) {
$multiplier = 1;
}
elseif ($this->unit === 'tsp') {
$multiplier = match ($this->food->serving_unit) {
'tbsp' => 1/3,
'cup' => 1/48,
};
}
elseif ($this->unit === 'tbsp') {
$multiplier = match ($this->food->serving_unit) {
'tsp' => 3,
'cup' => 1/16,
};
}
elseif ($this->unit === 'cup') {
$multiplier = match ($this->food->serving_unit) {
'tsp' => 48,
'tbsp' => 16,
};
}
else {
throw new \DomainException("Unhandled unit combination: {$this->unit}, {$this->food->serving_unit}");
}
return $multiplier / $this->food->serving_size * $this->amount;
}
}

48
app/Support/NutrientCalculator.php Normal file
View File

@ -0,0 +1,48 @@
<?php
namespace App\Support;
use App\Models\Food;
/**
* TODO: Refactor for more general use.
*/
class NutrientCalculator
{
public static function calculateFoodNutrientMultiplier(
Food $food,
float $amount,
string|null $fromUnit
): float {
if ($fromUnit === 'oz') {
return $amount * 28.349523125 / $food->serving_weight;
}
if ($food->serving_unit === $fromUnit) {
$multiplier = 1;
}
elseif ($fromUnit === 'tsp') {
$multiplier = match ($food->serving_unit) {
'tbsp' => 1/3,
'cup' => 1/48,
};
}
elseif ($fromUnit === 'tbsp') {
$multiplier = match ($food->serving_unit) {
'tsp' => 3,
'cup' => 1/16,
};
}
elseif ($fromUnit === 'cup') {
$multiplier = match ($food->serving_unit) {
'tsp' => 48,
'tbsp' => 16,
};
}
else {
throw new \DomainException("Unhandled unit combination: {$fromUnit}, {$food->serving_unit}");
}
return $multiplier / $food->serving_size * $amount;
}
}