import assert from 'node:assert/strict'
import test from 'node:test'

import { diffDays, resolveFinanceDateRange, shiftDate } from './finance-date-range.js'

test('resolveFinanceDateRange uses the requested date range', () => {
  const range = resolveFinanceDateRange({ dateFrom: '2026-10-01', dateTo: '2026-10-14' })
  assert.deepEqual(range, { fromDate: '2026-10-01', toDate: '2026-10-14' })
})

test('resolveFinanceDateRange rejects reversed and oversized ranges', () => {
  assert.throws(() => resolveFinanceDateRange({ dateFrom: '2026-10-14', dateTo: '2026-10-01' }))
  assert.throws(() =>
    resolveFinanceDateRange({ dateFrom: '2025-01-01', dateTo: '2026-10-01' }, { maxDays: 400 }),
  )
})

test('resolveFinanceDateRange defaults to the recent N calendar days', () => {
  const range = resolveFinanceDateRange({ dateTo: '2026-10-22' }, { defaultDays: 7 })
  assert.deepEqual(range, { fromDate: '2026-10-16', toDate: '2026-10-22' })
  assert.equal(diffDays(range.fromDate, range.toDate) + 1, 7)
})

test('shiftDate crosses months without timezone drift', () => {
  assert.equal(shiftDate('2026-03-01', -1), '2026-02-28')
  assert.equal(shiftDate('2026-12-31', 1), '2027-01-01')
})