import { describe, expect, it } from 'vitest'

import { formatTomanInWords, numberToPersianWords, parseAmountInputValue } from '@/helpers/numberToPersianWords'

describe('numberToPersianWords', () => {
  it('handles zero and small numbers', () => {
    expect(numberToPersianWords(0)).toBe('صفر')
    expect(numberToPersianWords(1)).toBe('یک')
    expect(numberToPersianWords(15)).toBe('پانزده')
    expect(numberToPersianWords(21)).toBe('بیست و یک')
    expect(numberToPersianWords(100)).toBe('صد')
    expect(numberToPersianWords(101)).toBe('صد و یک')
    expect(numberToPersianWords(250)).toBe('دویست و پنجاه')
  })

  it('handles thousands and millions', () => {
    expect(numberToPersianWords(1000)).toBe('یک هزار')
    expect(numberToPersianWords(450_000)).toBe('چهارصد و پنجاه هزار')
    expect(numberToPersianWords(1_000_000)).toBe('یک میلیون')
    expect(numberToPersianWords(1_250_000)).toBe('یک میلیون و دویست و پنجاه هزار')
  })

  it('rejects invalid values', () => {
    expect(numberToPersianWords(-1)).toBe('')
    expect(numberToPersianWords(1.5)).toBe('')
    expect(numberToPersianWords(Number.NaN)).toBe('')
  })
})

describe('parseAmountInputValue', () => {
  it('parses numbers and digit strings', () => {
    expect(parseAmountInputValue(1200)).toBe(1200)
    expect(parseAmountInputValue('1200')).toBe(1200)
    expect(parseAmountInputValue('۱۲۰۰')).toBe(1200)
    expect(parseAmountInputValue('')).toBeNull()
    expect(parseAmountInputValue(null)).toBeNull()
  })
})

describe('formatTomanInWords', () => {
  it('appends تومان and hides empty/zero', () => {
    expect(formatTomanInWords(0)).toBe('')
    expect(formatTomanInWords('')).toBe('')
    expect(formatTomanInWords(100_000)).toBe('صد هزار تومان')
    expect(formatTomanInWords('۲۵۰۰۰۰')).toBe('دویست و پنجاه هزار تومان')
  })
})