<?php

use App\Enums\PacePreference;
use App\Enums\PhysicalActivityLevel;
use App\Enums\UserSex;
use App\Enums\WeightGoal;
use App\Services\NutritionPlanCalculator;
use Carbon\CarbonImmutable;

beforeEach(function () {
    CarbonImmutable::setTestNow('2026-08-14 10:00:00');
});

afterEach(function () {
    CarbonImmutable::setTestNow();
});

it('calculates a reproducible maintenance plan', function () {
    $plan = (new NutritionPlanCalculator)->calculate(
        weightKg: 80,
        heightCm: 180,
        dateOfBirth: CarbonImmutable::parse('1996-08-14'),
        sex: UserSex::MAN,
        activityLevel: PhysicalActivityLevel::MODERATELY_ACTIVE,
        weightGoal: WeightGoal::MAINTAIN_WEIGHT,
        pacePreference: PacePreference::NORMAL,
    );

    expect($plan)
        ->formula_version->toBe('mifflin_st_jeor_v1')
        ->resting_metabolism->toBe(1780)
        ->maintenance_calories->toBe(2760)
        ->calorie_adjustment_percent->toBe(0.0)
        ->proteins->toBe(128)
        ->fats->toBe(77)
        ->carbs->toBe(389)
        ->calories->toBe(2761)
        ->and(($plan['proteins'] * 4) + ($plan['carbs'] * 4) + ($plan['fats'] * 9))
        ->toBe($plan['calories']);
});

it('applies bounded loss and gain adjustments', function (WeightGoal $goal, PacePreference $pace, float $expectedAdjustment) {
    $plan = (new NutritionPlanCalculator)->calculate(
        weightKg: 60,
        heightCm: 165,
        dateOfBirth: CarbonImmutable::parse('1990-01-01'),
        sex: UserSex::WOMAN,
        activityLevel: PhysicalActivityLevel::LIGHTLY_ACTIVE,
        weightGoal: $goal,
        pacePreference: $pace,
    );

    expect($plan['calorie_adjustment_percent'])->toBe($expectedAdjustment)
        ->and($plan['calories'])->toBeGreaterThanOrEqual(1200);
})->with([
    'normal loss' => [WeightGoal::LOSE_WEIGHT, PacePreference::NORMAL, -0.15],
    'fast gain' => [WeightGoal::GAIN_WEIGHT, PacePreference::FAST, 0.15],
]);

it('rejects a non binary metabolic calculation reference', function () {
    (new NutritionPlanCalculator)->calculate(
        weightKg: 70,
        heightCm: 170,
        dateOfBirth: CarbonImmutable::parse('1990-01-01'),
        sex: UserSex::UNKNOWN,
        activityLevel: PhysicalActivityLevel::SEDENTARY,
        weightGoal: WeightGoal::MAINTAIN_WEIGHT,
        pacePreference: PacePreference::SLOW,
    );
})->throws(InvalidArgumentException::class);