import { test } from 'node:test';
import assert from 'node:assert/strict';
import {
  f1, fInt, fmm, markerPos, barHeights, wmoIcon, trendLabel,
  formatDate, formatTime, dayAbbr, monthName, isOlderThan, msUntil,
} from '../../public/format.js';

const TZ = 'Europe/Berlin';

test('f1 uses a decimal comma and one decimal', () => {
  assert.equal(f1(16.4), '16,4');
  assert.equal(f1(0), '0,0');
  assert.equal(f1(19.75), '19,8');
  assert.equal(f1(null), '–');
  assert.equal(f1(undefined), '–');
});

test('fInt rounds to whole degrees', () => {
  assert.equal(fInt(18.3), '18');
  assert.equal(fInt(9.5), '10');
  assert.equal(fInt(null), '–');
});

test('fmm shows "0 mm" for zero', () => {
  assert.equal(fmm(0), '0 mm');
  assert.equal(fmm(0.4), '0,4 mm');
  assert.equal(fmm(8.25), '8,3 mm');
  assert.equal(fmm(null), '–');
});

test('markerPos interpolates and clamps', () => {
  assert.ok(Math.abs(markerPos(16.4, 9.2, 19.8) - 67.92) < 0.01);
  assert.equal(markerPos(5, 9.2, 19.8), 0);
  assert.equal(markerPos(25, 9.2, 19.8), 100);
  assert.equal(markerPos(10, 10, 10), 50);
  assert.equal(markerPos(null, 1, 2), 50);
});

test('barHeights scales to the tallest bar with a 2px floor', () => {
  const h = barHeights([1.2, 6.8, 0, 2.4]);
  assert.ok(Math.abs(h[0] - 12.35) < 0.01);
  assert.equal(h[1], 70);
  assert.equal(h[2], 2);
  assert.ok(Math.abs(h[3] - 24.7) < 0.01);
  assert.deepEqual(barHeights([0, 0, 0, 0]), [2, 2, 2, 2]);
  assert.deepEqual(barHeights([null, 0, undefined, 0]), [2, 2, 2, 2]);
  assert.deepEqual(barHeights([null, 5]), [2, 70]);
});

test('wmoIcon maps every documented code', () => {
  assert.equal(wmoIcon(0), 'sun');
  assert.equal(wmoIcon(1), 'partly');
  assert.equal(wmoIcon(2), 'partly');
  assert.equal(wmoIcon(3), 'cloud');
  assert.equal(wmoIcon(45), 'fog');
  assert.equal(wmoIcon(48), 'fog');
  assert.equal(wmoIcon(51), 'drizzle');
  assert.equal(wmoIcon(57), 'drizzle');
  assert.equal(wmoIcon(61), 'rain');
  assert.equal(wmoIcon(67), 'rain');
  assert.equal(wmoIcon(80), 'showers');
  assert.equal(wmoIcon(82), 'showers');
  assert.equal(wmoIcon(71), 'snow');
  assert.equal(wmoIcon(77), 'snow');
  assert.equal(wmoIcon(85), 'snow');
  assert.equal(wmoIcon(86), 'snow');
  assert.equal(wmoIcon(95), 'thunder');
  assert.equal(wmoIcon(99), 'thunder');
  assert.equal(wmoIcon(42), 'cloud');
  assert.equal(wmoIcon(null), 'cloud');
});

test('trendLabel', () => {
  assert.equal(trendLabel('up'), '↗ stijgend');
  assert.equal(trendLabel('down'), '↘ dalend');
  assert.equal(trendLabel('stable'), '→ stabiel');
  assert.equal(trendLabel(null), '');
});

test('formatDate gives a capitalised Dutch date in the station timezone', () => {
  assert.equal(formatDate(new Date('2026-09-11T12:32:05Z'), TZ), 'Vrijdag 11 september');
  // 23:30 UTC is al de volgende dag in Berlijn
  assert.equal(formatDate(new Date('2026-09-11T23:30:00Z'), TZ), 'Zaterdag 12 september');
});

test('formatTime uses HH:MM in the station timezone', () => {
  assert.equal(formatTime('2026-09-11T06:10:00+02:00', TZ), '06:10');
  assert.equal(formatTime('2026-09-11T22:05:00Z', TZ), '00:05');
  assert.equal(formatTime(null, TZ), '–');
  assert.equal(formatTime('kapot', TZ), '–');
});

test('dayAbbr gives two-letter Dutch weekday', () => {
  assert.equal(dayAbbr('2026-09-12', TZ), 'Za');
  assert.equal(dayAbbr('2026-09-13', TZ), 'Zo');
  assert.equal(dayAbbr('2026-09-14', TZ), 'Ma');
  assert.equal(dayAbbr('2026-09-15', TZ), 'Di');
  assert.equal(dayAbbr('2026-09-16', TZ), 'Wo');
  assert.equal(dayAbbr('2026-09-17', TZ), 'Do');
  assert.equal(dayAbbr('2026-09-18', TZ), 'Vr');
});

test('monthName', () => {
  assert.equal(monthName(new Date('2026-09-11T12:00:00Z'), TZ), 'September');
});

test('isOlderThan', () => {
  const now = new Date('2026-09-11T12:32:00Z');
  assert.equal(isOlderThan('2026-09-11T12:10:00Z', now, 30), false);
  assert.equal(isOlderThan('2026-09-11T11:50:00Z', now, 30), true);
  assert.equal(isOlderThan(null, now, 30), true);
});

test('msUntil computes the wait until the next local time', () => {
  const now = new Date('2026-09-11T12:32:05.500Z'); // 14:32:05 in Berlijn
  assert.equal(msUntil(now, TZ, 0), ((24 - 14) * 3600 - 32 * 60 - 5) * 1000 - 500);
  assert.equal(msUntil(now, TZ, 4), ((24 - 14 + 4) * 3600 - 32 * 60 - 5) * 1000 - 500);
  assert.equal(msUntil(now, TZ, 15), (28 * 60 - 5) * 1000 - 500);
  assert.equal(msUntil(new Date('2026-09-11T22:00:00.000Z'), TZ, 0), 86400000, 'precies op het moment zelf: pas morgen weer');
});