'use strict';

const assert = require('assert');
const appDateTime = require('../helpers/application_datetime');

function iso(date) {
  return date.toISOString();
}

function run() {
  const brisbaneOffset = appDateTime.getUtcOffsetMinutesFromLocation(-27.4698, 153.0251, '2025-05-22');
  const chicagoOffset = appDateTime.getUtcOffsetMinutesFromLocation(41.8781, -87.6298, '2025-05-22');

  assert.strictEqual(brisbaneOffset, 600, 'Brisbane should be UTC+10 in May');
  assert.strictEqual(chicagoOffset, -300, 'Chicago should be UTC-5 in May');

  assert.strictEqual(
    iso(appDateTime.toUtcDateFromAppDateTime('20250522T000000', 600)),
    '2025-05-22T00:00:00.000Z',
    'UTC+10 hybrid time should stay on the same UTC day when UTC time-of-day is midnight'
  );

  assert.strictEqual(
    iso(appDateTime.toUtcDateFromAppDateTime('20250522T220000', 600)),
    '2025-05-21T22:00:00.000Z',
    'UTC+10 hybrid time should roll back one UTC day when the local wall clock crosses midnight'
  );

  assert.strictEqual(
    iso(appDateTime.toUtcDateFromAppDateTime('20250522T150000', -300)),
    '2025-05-22T15:00:00.000Z',
    'UTC-5 hybrid time should preserve the UTC day for afternoon records'
  );

  const isoUtc = '2025-05-22T10:15:30.000Z';
  assert.strictEqual(
    iso(appDateTime.toUtcDateFromAppDateTime(isoUtc, 600)),
    isoUtc,
    'ISO UTC inputs should be returned unchanged'
  );

  const meta = appDateTime.buildApplicationDateFields({
    startDateTime: '20250522T000000',
    endDateTime: '20250522T220000',
    latitude: -27.4698,
    longitude: 153.0251
  });

  assert.strictEqual(meta.utcOffset, 600, 'Build helper should return the location-based offset');
  assert.strictEqual(iso(meta.startDateTimeUTC), '2025-05-22T00:00:00.000Z');
  assert.strictEqual(iso(meta.endDateTimeUTC), '2025-05-21T22:00:00.000Z');

  console.log('✅ application datetime helper tests passed');
}

run();