namespace YBEE.EQM.Core;

public static class ConvertUtil
{
    public static string ConvertToChinese(int num)
    {
        if (num == 0)
        {
            return "零";
        }

        string[] units = new string[] { "", "十", "百", "千", "万", "亿", "十亿", "百亿", "千亿", "兆" };
        string[] digits = new string[] { "零", "一", "二", "三", "四", "五", "六", "七", "八", "九" };

        bool isNegative = false;
        if (num < 0)
        {
            isNegative = true;
            num *= -1;
        }

        string result = "";
        while (num > 0)
        {
            int digit = num % 10;

            if (!isZeroDigit(digit))
            {
                result = digits[digit] + units[result.Length / 4] + result;
            }

            num /= 10;
        }

        if (isNegative)
        {
            result += "负";
        }

        return result;

        bool isZeroDigit(int digit)
        {
            return digit == 0 || digit == 1 && string.IsNullOrEmpty(digits[digit]);
        }
    }
}