String numberToLocale(String str, Locale locale) {
    if (str.isEmpty) return str;
    switch (locale.languageCode) {
      case 'ar':
        return convertToHindiNumbers(str);
      case 'en':
        return convertToArabicNumbers(str);
    }
    return str;
  }

  String convertToArabicNumbers(String str) {
    return str
        .replaceAll('٠', '0')
        .replaceAll('١', '1')
        .replaceAll('٢', '2')
        .replaceAll('٣', '3')
        .replaceAll('٤', '4')
        .replaceAll('٥', '5')
        .replaceAll('٦', '6')
        .replaceAll('٧', '7')
        .replaceAll('٨', '8')
        .replaceAll('٩', '9');
  }

  String convertToHindiNumbers(String str) {
    return str
        .replaceAll('0', '٠')
        .replaceAll('1', '١')
        .replaceAll('2', '٢')
        .replaceAll('3', '٣')
        .replaceAll('4', '٤')
        .replaceAll('5', '٥')
        .replaceAll('6', '٦')
        .replaceAll('7', '٧')
        .replaceAll('8', '٨')
        .replaceAll('9', '٩');
  }

  String capitalizeFirstChar(String str) {
    return '${str[0].toUpperCase()}${str.substring(1)}';
  }

  String capitalizeFirstCharForEachWord(String str) {
    return str
        .split(' ')
        .map((s) => s.isEmpty ? '' : capitalizeFirstChar(s))
        .join(' ');
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(),
        body: Center(
          child: Padding(
            padding: const EdgeInsets.all(6.0),
            child: Column(
              children: [
                TextFormField(
                  controller: controller,
                ),
                Padding(
                  padding: const EdgeInsets.all(10.0),
                  child: Text(controller.text,style: TextStyle(fontSize: 22),),
                ),
                ElevatedButton(
                    onPressed: () {
                      setState(() {
                        controller.text = numberToLocale(controller.text, Locale('ar'));
                      });
                    },
                    child: Text('to Ar')),
                ElevatedButton(
                    onPressed: () {
                      setState(() {
                        controller.text = numberToLocale(controller.text, Locale('en'));
                      });
                    },
                    child: Text('to En')),
                ElevatedButton(
                    onPressed: () {
                      controller.text = capitalizeFirstCharForEachWord(controller.text);
                    },
                    child: Text('to Capital')),
              ],
            ),
          ),
        ));
  }