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// Define an array of Persian digits
const persianDigits = [
  'صفر',
  'یک',
  'دو',
  'سه',
  'چهار',
  'پنج',
  'شش',
  'هفت',
  'هشت',
  'نه',
];

// Define an array of Persian tens
const persianTens = [
  'ده',
  'بیست',
  'سی',
  'چهل',
  'پنجاه',
  'شصت',
  'هفتاد',
  'هشتاد',
  'نود',
];

// Define an array of Persian hundreds
const persianHundreds = [
  'صد',
  'دویست',
  'سیصد',
  'چهارصد',
  'پانصد',
  'ششصد',
  'هفتصد',
  'هشتصد',
  'نهصد',
];

// Define a function to convert a single digit to Persian
function digitToPersian(digit) {
  return persianDigits[digit];
}

// Define a function to convert a two-digit number to Persian
function twoDigitsToPersian(number) {
  // If the number is less than 10, use the digitToPersian function
  if (number < 10) {
    return digitToPersian(number);
  }
  // If the number is a multiple of 10, use the persianTens array
  else if (number % 10 == 0) {
    return persianTens[number / 10 - 1];
  }
  // Otherwise, use the persianTens and digitToPersian functions with a و in between
  else {
    let ten = Math.floor(number / 10);
    let one = number % 10;
    return persianTens[ten - 1] + ' و ' + digitToPersian(one);
  }
}

// Define a function to convert a three-digit number to Persian
function threeDigitsToPersian(number) {
  // If the number is less than 100, use the twoDigitsToPersian function
  if (number < 100) {
    return twoDigitsToPersian(number);
  }
  // If the number is a multiple of 100, use the persianHundreds array
  else if (number % 100 == 0) {
    return persianHundreds[number / 100 - 1];
  }
  // Otherwise, use the persianHundreds and twoDigitsToPersia functions with a و in between
  else {
    let hundred = Math.floor(number / 100);
    let rest = number % 100;
    return persianHundreds[hundred - 1] + ' و ' + twoDigitsToPersian(rest);
  }
}

// Define a function to convert any four-digit number to Persian
function fourDigitsToPersia(number) {
  // If the number is less than or equal to zero or greater than or equal to ten thousand ,return an error message
  if (number <= 0 || number >= 10000) {
    return 'Invalid input. Please enter a positive four-digit number.';
  }
  // If the number is less than one thousand ,use the threeDigitsToPersia function
  else if (number < 1000) {
    return threeDigitsToPersian(number);
  }
  // If the number is equal to one thousand ,return هزار
  else if (number == 1000) {
    return ' هزار ';
  }
}
console.log(fourDigitsToPersia(100));