import { test } from 'node:test';
import assert from 'node:assert/strict';

import {
  getActiveSeason,
  resolveSeasonTheme,
  SEASON_SCHEDULE,
  SEASON_DATE_RANGES,
} from './seasonSchedule';
import { SeasonTheme } from './types';

// Date(year, monthIndex0, day)
const on = (monthIndex0: number, day: number): Date => new Date(2026, monthIndex0, day);

test('each theme activates on a representative day in its window', () => {
  const cases: Array<[Date, SeasonTheme]> = [
    [on(11, 31), 'newyear'], // Dec 31
    [on(0, 1), 'newyear'], // Jan 1
    [on(0, 25), 'lunar'], // Jan 25
    [on(1, 3), 'lunar'], // Feb 3
    [on(1, 12), 'valentines'], // Feb 12
    [on(2, 16), 'stpatricks'], // Mar 16
    [on(3, 1), 'aprilfools'], // Apr 1
    [on(3, 21), 'earthday'], // Apr 21
    [on(8, 12), 'arcade'], // Sep 12
    [on(8, 25), 'autumn'], // Sep 25
    [on(9, 20), 'halloween'], // Oct 20
    [on(10, 1), 'halloween'], // Nov 1
    [on(11, 15), 'christmas'], // Dec 15
  ];
  for (const [date, expected] of cases) {
    assert.equal(getActiveSeason(date), expected, `${date.toDateString()} -> ${expected}`);
  }
});

test('priority order resolves overlapping windows (Deep Space outranks Autumn)', () => {
  // Oct 4-10 is inside Autumn's Oct<=14 window too; Deep Space comes first.
  assert.equal(getActiveSeason(on(9, 5)), 'deepspace'); // Oct 5
  // Oct 12 is past Deep Space -> falls through to Autumn.
  assert.equal(getActiveSeason(on(9, 12)), 'autumn');
});

test('New Year outranks Lunar New Year on Jan 1-2', () => {
  assert.equal(getActiveSeason(on(0, 1)), 'newyear');
  // Jan 22+ is past New Year -> Lunar.
  assert.equal(getActiveSeason(on(0, 22)), 'lunar');
});

test('returns null on an off-season day', () => {
  assert.equal(getActiveSeason(on(5, 15)), null); // Jun 15
  assert.equal(getActiveSeason(on(6, 4)), null); // Jul 4
});

test('window boundaries are inclusive at both ends', () => {
  assert.equal(getActiveSeason(on(1, 10)), 'valentines'); // Feb 10 start
  assert.equal(getActiveSeason(on(1, 15)), 'valentines'); // Feb 15 end
  assert.equal(getActiveSeason(on(1, 16)), null); // Feb 16 just after
});

test('resolveSeasonTheme: off → null, pinned → that theme, auto → active season', () => {
  const halloweenTs = on(9, 20).getTime(); // Oct 20 → halloween season
  const offSeasonTs = on(5, 15).getTime(); // Jun 15 → no season
  // 'off' never renders, regardless of date.
  assert.equal(resolveSeasonTheme('off', halloweenTs), null);
  // A pinned theme renders regardless of date (even off-season).
  assert.equal(resolveSeasonTheme('christmas', offSeasonTs), 'christmas');
  // 'auto' tracks the active season for the given instant.
  assert.equal(resolveSeasonTheme('auto', halloweenTs), 'halloween');
  assert.equal(resolveSeasonTheme('auto', offSeasonTs), null);
});

test('resolveSeasonTheme: auto re-evaluates as `now` advances across a boundary', () => {
  // The same 'auto' override yields different themes at different instants — this
  // is what the SeasonalEffect ticker relies on (incl. the switch-into-auto case
  // where `now` must be current, not a stale mount value).
  assert.equal(resolveSeasonTheme('auto', on(9, 20).getTime()), 'halloween'); // Oct 20
  assert.equal(resolveSeasonTheme('auto', on(11, 15).getTime()), 'christmas'); // Dec 15
  assert.equal(resolveSeasonTheme('auto', on(6, 4).getTime()), null); // Jul 4
});

test('SEASON_DATE_RANGES has a label for every scheduled theme', () => {
  assert.equal(SEASON_SCHEDULE.length, 11);
  const themes = SEASON_SCHEDULE.map((e) => e.theme);
  assert.equal(new Set(themes).size, 11); // unique
  for (const t of themes) {
    assert.ok(
      typeof SEASON_DATE_RANGES[t] === 'string' && SEASON_DATE_RANGES[t].length > 0,
      `missing date range for ${t}`,
    );
  }
});