import { describe, it, expect } from 'vitest'
import { splitReservationDateTime, resolveDayId, formatMoney, formatMoneySum, currencyDecimals, localizeAmountInput } from './formatters'
import { CURRENCIES, SYMBOLS, currenciesWith } from '../components/Budget/BudgetPanel.constants'
import type { Day } from '../types'

const days = [
  { id: 10, date: '2026-05-03' },
  { id: 11, date: '2026-05-04' },
  { id: 12, date: '2026-05-22' },
] as Day[]

describe('resolveDayId', () => {
  it('returns the exact-match day id', () => {
    expect(resolveDayId(days, '2026-05-04')).toBe(11)
  })
  it('accepts a full ISO timestamp', () => {
    expect(resolveDayId(days, '2026-05-22T13:30:00')).toBe(12)
  })
  it('falls back to the nearest day when there is no exact match', () => {
    expect(resolveDayId(days, '2026-05-05')).toBe(11)
  })
  it('returns "" for a missing/invalid date or no days', () => {
    expect(resolveDayId(days, null)).toBe('')
    expect(resolveDayId(days, 'not a date')).toBe('')
    expect(resolveDayId([], '2026-05-04')).toBe('')
  })
})

describe('localizeAmountInput (#1624)', () => {
  it('shows the amount with the currency comma separator so the field matches the list', () => {
    expect(localizeAmountInput('12.5', 'EUR')).toBe('12,5')
    expect(localizeAmountInput('0.00', 'EUR')).toBe('0,00')
  })
  it('keeps the dot for dot-separator currencies', () => {
    expect(localizeAmountInput('12.5', 'USD')).toBe('12.5')
  })
  it('passes an empty/nullish value through unchanged', () => {
    expect(localizeAmountInput('', 'EUR')).toBe('')
    expect(localizeAmountInput(null, 'EUR')).toBe('')
  })
})

describe('KGS currency (#1400)', () => {
  it('is selectable everywhere the shared currency list feeds', () => {
    expect(CURRENCIES).toContain('KGS')
    expect(SYMBOLS.KGS).toBeTruthy()
  })
  it('formats without throwing', () => {
    // Lenient: older ICU builds may lack ru-KG/KGS display data and fall back.
    const out = formatMoney(1234.56, 'KGS', 'en')
    expect(out).toMatch(/сом|KGS/)
    expect(out).toContain('234')
  })
})

describe('Frankfurter-supported currency list (#1470)', () => {
  it('offers the currencies that were previously missing', () => {
    for (const c of ['OMR', 'CRC', 'UGX', 'MKD', 'ALL']) {
      expect(CURRENCIES).toContain(c)
    }
  })
  it('drops currencies Frankfurter has archived', () => {
    expect(CURRENCIES).not.toContain('BGN')
    expect(CURRENCIES).not.toContain('HRK')
  })
  it('has a symbol for every selectable currency', () => {
    for (const c of CURRENCIES) expect(SYMBOLS[c]).toBeTruthy()
  })
})

describe('currencyDecimals', () => {
  it('uses 2 decimals for standard currencies', () => {
    expect(currencyDecimals('USD')).toBe(2)
    expect(currencyDecimals('EUR')).toBe(2)
  })
  it('uses 0 decimals for zero-decimal currencies', () => {
    for (const c of ['JPY', 'HUF', 'UGX', 'XOF', 'RWF', 'VUV']) {
      expect(currencyDecimals(c)).toBe(0)
    }
  })
  it('uses 3 decimals for the Gulf/dinar currencies', () => {
    for (const c of ['OMR', 'KWD', 'BHD', 'TND']) {
      expect(currencyDecimals(c)).toBe(3)
    }
  })
})

describe('currenciesWith (legacy safeguard)', () => {
  it('returns the base list unchanged for a supported currency', () => {
    expect(currenciesWith('EUR')).toBe(CURRENCIES)
    expect(currenciesWith(null)).toBe(CURRENCIES)
  })
  it('keeps an archived/legacy selection selectable', () => {
    const opts = currenciesWith('HRK')
    expect(opts).toContain('HRK')
    expect(opts.length).toBe(CURRENCIES.length + 1)
  })
})

describe('formatMoneySum (#1561)', () => {
  // Intl money strings use non-breaking / narrow no-break spaces; normalize for assertions.
  const norm = (s: string | null) => s?.replace(/[\u00A0\u202F]/g, ' ') ?? null

  it('returns null for empty input and for zero/negative/non-finite amounts', () => {
    expect(formatMoneySum([], 'EUR', 'en')).toBeNull()
    expect(formatMoneySum([{ amount: 0, currency: 'EUR' }], 'EUR', 'en')).toBeNull()
    expect(formatMoneySum([{ amount: -5, currency: 'EUR' }], 'EUR', 'en')).toBeNull()
    expect(formatMoneySum([{ amount: NaN, currency: 'EUR' }], 'EUR', 'en')).toBeNull()
  })

  it('sums a single-currency set without rates and without an ≈ marker', () => {
    const out = formatMoneySum(
      [{ amount: 20, currency: 'USD' }, { amount: 30, currency: 'usd' }],
      'USD', 'en',
    )
    expect(out).toBe('$50.00')
  })

  it('converts foreign amounts into the base when rates cover them', () => {
    // rates[X] = units of X per 1 base (frankfurter): 10 NOK = 1 USD here.
    const out = formatMoneySum(
      [{ amount: 25, currency: 'USD' }, { amount: 250, currency: 'NOK' }],
      'USD', 'en', { NOK: 10 },
    )
    expect(out).toBe('≈ $50.00')
  })

  it('falls back to a per-currency breakdown when rates are missing', () => {
    const entries = [
      { amount: 2500, currency: 'NOK' },
      { amount: 2730.27, currency: 'USD' },
    ]
    for (const rates of [undefined, null, {}, { USD: 0 }]) {
      const out = norm(formatMoneySum(entries, 'NOK', 'en', rates))
      expect(out).toContain(' + ')
      expect(out).toContain('$2,730.27')
      expect(out).not.toContain('≈')
      // the foreign amount must never be folded into a base-labeled number
      expect(out).not.toMatch(/5 ?230/)
    }
  })

  it('orders the breakdown base-first, then foreign currencies by code', () => {
    const out = norm(formatMoneySum(
      [
        { amount: 1, currency: 'USD' },
        { amount: 2, currency: 'EUR' },
        { amount: 3, currency: 'NOK' },
      ],
      'NOK', 'en',
    ))!
    expect(out.indexOf('kr')).toBeLessThan(out.indexOf('€'))
    expect(out.indexOf('€')).toBeLessThan(out.indexOf('$'))
  })

  it('renders a lone foreign amount honestly in its own currency', () => {
    expect(formatMoneySum([{ amount: 2730.27, currency: 'USD' }], 'NOK', 'en')).toBe('$2,730.27')
  })

  it('applies opts.decimals to every part', () => {
    expect(formatMoneySum([{ amount: 50.4, currency: 'USD' }], 'USD', 'en', null, { decimals: 0 })).toBe('$50')
    const breakdown = norm(formatMoneySum(
      [{ amount: 50.4, currency: 'USD' }, { amount: 10.2, currency: 'NOK' }],
      'USD', 'en', null, { decimals: 0 },
    ))
    expect(breakdown).toContain('$50')
    expect(breakdown).toMatch(/10\s?kr|kr\s?10/)
  })

  it('tolerates currency codes unknown to Intl', () => {
    const out = formatMoneySum([{ amount: 12, currency: 'XYZ' }], 'XYZ', 'en')
    expect(out).toContain('XYZ')
    expect(out).toContain('12')
  })
})

describe('splitReservationDateTime', () => {
  it('parses full ISO datetime', () => {
    expect(splitReservationDateTime('2026-06-25T10:00')).toEqual({ date: '2026-06-25', time: '10:00' })
  })

  it('parses full datetime with seconds', () => {
    expect(splitReservationDateTime('2026-06-25T10:00:30')).toEqual({ date: '2026-06-25', time: '10:00' })
  })

  it('parses date-only string', () => {
    expect(splitReservationDateTime('2026-06-25')).toEqual({ date: '2026-06-25', time: null })
  })

  it('parses bare HH:MM (new dateless format)', () => {
    expect(splitReservationDateTime('10:00')).toEqual({ date: null, time: '10:00' })
  })

  it('parses bare single-digit hour time', () => {
    expect(splitReservationDateTime('9:30')).toEqual({ date: null, time: '9:30' })
  })

  it('handles legacy malformed T-prefixed time ("T10:00")', () => {
    expect(splitReservationDateTime('T10:00')).toEqual({ date: null, time: '10:00' })
  })

  it('returns null date for T-prefixed without valid date', () => {
    const result = splitReservationDateTime('T23:59')
    expect(result.date).toBeNull()
    expect(result.time).toBe('23:59')
  })

  it('returns nulls for null input', () => {
    expect(splitReservationDateTime(null)).toEqual({ date: null, time: null })
  })

  it('returns nulls for undefined input', () => {
    expect(splitReservationDateTime(undefined)).toEqual({ date: null, time: null })
  })

  it('returns nulls for empty string', () => {
    expect(splitReservationDateTime('')).toEqual({ date: null, time: null })
  })

  it('returns nulls for unrecognized string', () => {
    expect(splitReservationDateTime('garbage')).toEqual({ date: null, time: null })
  })

  // #1725 — slicing the time part to five characters used to swallow the meridiem,
  // so an afternoon booking came back as a morning one.
  it('converts a meridiem time part instead of cutting it off', () => {
    expect(splitReservationDateTime('2026-08-01T3:00 PM')).toEqual({ date: '2026-08-01', time: '15:00' })
    expect(splitReservationDateTime('2026-08-01T12:30 am')).toEqual({ date: '2026-08-01', time: '00:30' })
  })

  it('converts a bare meridiem time', () => {
    expect(splitReservationDateTime('3:00 PM')).toEqual({ date: null, time: '15:00' })
    expect(splitReservationDateTime('3 PM')).toEqual({ date: null, time: '15:00' })
  })
})