const assert = require('node:assert/strict');
const test = require('node:test');

const {
    buildRfmSegments,
    buildDateFilter,
    getRfmSegment,
    normalizeDateParam,
    scoreTertile
} = require('../services/analyticsService');

test('normalizeDateParam accepts strict ISO dates', () => {
    assert.equal(normalizeDateParam('2026-05-28'), '2026-05-28');
});

test('normalizeDateParam rejects non-ISO or impossible dates', () => {
    assert.equal(normalizeDateParam('28/05/2026'), null);
    assert.equal(normalizeDateParam('2026-02-31'), null);
    assert.equal(normalizeDateParam(''), null);
});

test('buildDateFilter builds bounded date predicates', () => {
    const filter = buildDateFilter({ start: '2026-05-01', end: '2026-05-28' });

    assert.deepEqual(filter.params, ['2026-05-01', '2026-05-28']);
    assert.equal(
        filter.whereClause,
        'WHERE data_pedido_date IS NOT NULL AND data_pedido_date >= $1::date AND data_pedido_date <= $2::date'
    );
});

test('buildDateFilter ignores invalid bounds', () => {
    const filter = buildDateFilter({ start: 'invalid', end: '2026-05-28' });

    assert.deepEqual(filter.params, ['2026-05-28']);
    assert.equal(
        filter.whereClause,
        'WHERE data_pedido_date IS NOT NULL AND data_pedido_date <= $1::date'
    );
});

test('scoreTertile scores higher values higher by default', () => {
    const values = [10, 20, 30, 40, 50];

    assert.equal(scoreTertile(10, values), 1);
    assert.equal(scoreTertile(30, values), 2);
    assert.equal(scoreTertile(50, values), 3);
});

test('scoreTertile can score lower values higher for recency', () => {
    const recencyDays = [2, 10, 20, 40, 80];

    assert.equal(scoreTertile(2, recencyDays, false), 3);
    assert.equal(scoreTertile(20, recencyDays, false), 2);
    assert.equal(scoreTertile(80, recencyDays, false), 1);
});

test('getRfmSegment maps the 3x3 RFM matrix', () => {
    assert.deepEqual(getRfmSegment(3, 3), { key: 'champions', label: 'Champions' });
    assert.deepEqual(getRfmSegment(2, 2), { key: 'need_attention', label: 'Precisam de Atenção' });
    assert.deepEqual(getRfmSegment(1, 1), { key: 'lost', label: 'Perdidos' });
});

test('buildRfmSegments summarizes segment count and revenue', () => {
    const segments = buildRfmSegments([
        { segmentKey: 'champions', monetary: 100 },
        { segmentKey: 'champions', monetary: 50 },
        { segmentKey: 'lost', monetary: 25 }
    ]);

    const champions = segments.find(segment => segment.key === 'champions');
    const lost = segments.find(segment => segment.key === 'lost');

    assert.equal(champions.count, 2);
    assert.equal(champions.totalRevenue, 150);
    assert.equal(champions.averageRevenue, 75);
    assert.equal(lost.count, 1);
    assert.equal(lost.totalRevenue, 25);
});