food-tracer/server/src/tests/bodyMetrics.test.ts

process.env.CALORIE_PROVIDER = 'none';

import { computeBmi, computeBodyFat, computeBodyMetrics, getBmiCategory, normalizeGoals } from "../bodyMetrics";
import { getSettings, saveBasalCalories, saveGoals, saveProfile } from "../settings";
import { getWeights, saveWeight } from "../weights";
import { getDayOverview } from "../dayOverview";
import { addMeal } from "../meals";
import { resetMemoryStorage } from "../storage/memory";
import { BmiKategorie, MealType, Pohlavi } from "../../../types/gen/types.gen";

const LOGIN = 'tester';

const muz = { sex: Pohlavi.MUZ, birthYear: 1990, heightCm: 185 };

beforeEach(() => resetMemoryStorage());

describe('BMI a zdravá hmotnost', () => {

    it('spočítá BMI na desetiny', () => {
        // 90 / 1,85² = 26,296…
        expect(computeBmi(90_000, 185)).toBe(26.3);
    });

    it('zařadí BMI do pásem WHO včetně hranic', () => {
        expect(getBmiCategory(18.4)).toBe(BmiKategorie.PODVAHA);
        expect(getBmiCategory(18.5)).toBe(BmiKategorie.NORMA);
        expect(getBmiCategory(24.9)).toBe(BmiKategorie.NORMA);
        expect(getBmiCategory(25)).toBe(BmiKategorie.NADVAHA);
        expect(getBmiCategory(30)).toBe(BmiKategorie.OBEZITA);
    });

    it('rozmezí zdravé hmotnosti odpovídá BMI 18,5–25 pro výšku', () => {
        const metrics = computeBodyMetrics(muz);

        // 18,5 × 1,85² = 63,3 kg, 25 × 1,85² = 85,6 kg
        expect(metrics.healthyWeightMinGrams).toBe(63_300);
        expect(metrics.healthyWeightMaxGrams).toBe(85_600);
        expect(metrics.bmi).toBeUndefined();
    });
});

describe('podíl tuku (US Navy)', () => {

    it('u muže počítá z pasu a krku', () => {
        expect(computeBodyFat({ ...muz, waistCm: 90, neckCm: 40 })).toBe(17.6);
    });

    it('u ženy potřebuje i boky', () => {
        const zena = { sex: Pohlavi.ZENA, heightCm: 168, waistCm: 72, neckCm: 33 };

        expect(computeBodyFat(zena)).toBeUndefined();
        // 495 / (1,29579 − 0,35004 × log10(137) + 0,221 × log10(168)) − 450
        expect(computeBodyFat({ ...zena, hipCm: 98 })).toBe(26.1);
    });

    it('nesmyslné obvody nedají žádný odhad', () => {
        expect(computeBodyFat({ ...muz, waistCm: 40, neckCm: 45 })).toBeUndefined();
        expect(computeBodyFat({ ...muz, waistCm: 90 })).toBeUndefined();
    });
});

describe('cíle', () => {

    it('půl kila týdně dolů je denní bilance −550 kcal', () => {
        expect(computeBodyMetrics(muz, { weeklyChangeGrams: -500 }).targetDailyBalance).toBe(-550);
    });

    it('bílkoviny počítá z hmotnosti a cílový termín jen ve směru tempa', () => {
        const metrics = computeBodyMetrics(
            muz, { weeklyChangeGrams: -500, targetWeightGrams: 85_000, proteinPerKg: 1.6 },
            { date: '2026-10-01', weightGrams: 90_000 });

        expect(metrics.proteinTargetGrams).toBe(144);
        expect(metrics.weeksToTarget).toBe(10);
        expect(computeBodyMetrics(muz, { weeklyChangeGrams: 250, targetWeightGrams: 85_000 },
            { date: '2026-10-01', weightGrams: 90_000 }).weeksToTarget).toBeUndefined();
    });

    it('cíle se ukládají znormalizované a prázdné se odstraní', async () => {
        const settings = await saveGoals(LOGIN, { weeklyChangeGrams: -500, proteinPerKg: 1.64 });
        expect(settings.goals).toEqual({ weeklyChangeGrams: -500, proteinPerKg: 1.6 });

        expect((await saveGoals(LOGIN, {})).goals).toBeUndefined();
    });

    it('odmítne cíl mimo rozsah', () => {
        expect(() => normalizeGoals({ weeklyChangeGrams: -5000 })).toThrow(/mimo rozsah/);
        expect(() => normalizeGoals({ proteinPerKg: 10 })).toThrow(/mimo rozsah/);
    });
});

describe('vážení po dnech', () => {

    it('ukládá, přepisuje a maže vážení dne', async () => {
        await saveWeight(LOGIN, '2026-10-02', 89_500);
        await saveWeight(LOGIN, '2026-10-01', 90_000);
        await saveWeight(LOGIN, '2026-10-02', 89_400);

        expect(await getWeights(LOGIN)).toEqual([
            { date: '2026-10-01', weightGrams: 90_000 },
            { date: '2026-10-02', weightGrams: 89_400 },
        ]);

        await saveWeight(LOGIN, '2026-10-02', null);
        expect(await getWeights(LOGIN)).toHaveLength(1);
    });

    it('odmítne hmotnost mimo rozsah', async () => {
        await expect(saveWeight(LOGIN, '2026-10-01', 900)).rejects.toThrow(/mimo rozsah/);
    });

    it('ukazatele v nastavení počítají s posledním vážením místo hmotnosti z profilu', async () => {
        await saveProfile(LOGIN, { ...muz, weightGrams: 95_000 });
        await saveWeight(LOGIN, '2026-10-01', 90_000);

        const fromWeighing = await getSettings(LOGIN);
        await saveWeight(LOGIN, '2026-10-01', null);
        const fromProfile = await getSettings(LOGIN);

        expect(fromWeighing.bodyMetrics).toMatchObject({ weightGrams: 90_000, weightDate: '2026-10-01', bmi: 26.3 });
        expect(fromProfile.bodyMetrics?.weightDate).toBeUndefined();
        // 10 kcal na kilogram rozdílu
        expect(fromProfile.computedBasalCalories! - fromWeighing.computedBasalCalories!).toBe(50);
    });

    it('bilance dne bere hmotnost platnou k tomu dni, ne poslední', async () => {
        await saveProfile(LOGIN, muz);
        await saveWeight(LOGIN, '2026-09-01', 95_000);
        await saveWeight(LOGIN, '2026-10-01', 90_000);

        const september = await getDayOverview(LOGIN, '2026-09-15');
        const october = await getDayOverview(LOGIN, '2026-10-05');

        expect(september.energy.basal - october.energy.basal).toBe(50);
        expect(september.weightGrams).toBeUndefined();
        expect((await getDayOverview(LOGIN, '2026-10-01')).weightGrams).toBe(90_000);
    });

    it('ruční klidový výdej má přednost i před vážením', async () => {
        await saveProfile(LOGIN, muz);
        await saveWeight(LOGIN, '2026-10-01', 90_000);
        await saveBasalCalories(LOGIN, 1500);

        expect((await getDayOverview(LOGIN, '2026-10-01')).energy.basal).toBe(1500);
    });

    it('přehled dne nese cílovou bilanci a cíl bílkovin', async () => {
        await saveWeight(LOGIN, '2026-10-01', 90_000);
        await saveGoals(LOGIN, { weeklyChangeGrams: -500, proteinPerKg: 2 });
        await addMeal(LOGIN, { date: '2026-10-01', mealType: MealType.OBED, name: 'Guláš', calories: 700 });

        const overview = await getDayOverview(LOGIN, '2026-10-01');

        expect(overview.energy.targetBalance).toBe(-550);
        expect(overview.proteinTargetGrams).toBe(180);
    });
});