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

import { countSmsSegments } from '@/lib/smsSegments'

describe('countSmsSegments', () => {
  it('counts a short Persian body as one UCS-2 segment', () => {
    const text = 'رزرو شما تأیید شد'

    expect(countSmsSegments(text)).toEqual({
      chars: Array.from(text).length,
      segments: 1,
      unicode: true,
    })
  })

  it('splits a long Persian body into 67-character segments', () => {
    const body = 'ا'.repeat(71)

    expect(countSmsSegments(body)).toEqual({
      chars: 71,
      segments: 2,
      unicode: true,
    })
  })

  it('keeps GSM-7 English within 160 characters as one segment', () => {
    expect(countSmsSegments('Your booking is confirmed')).toEqual({
      chars: 25,
      segments: 1,
      unicode: false,
    })
  })
})