using System;
using System.ComponentModel;
using System.Globalization;

namespace GeoSigma.SigmaDrawerStyle.Converter
{
    public class DoubleTrimConverter : DoubleConverter
    {
        /// <inheritdoc/>
        public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
        {
            if (destinationType == typeof(string))
            {
                string strValue = Convert.ToString(value);
                int nIndexDot = strValue.IndexOf('.');
                if (nIndexDot > 0)
                {
                    int nFlag = strValue.IndexOf("0000", nIndexDot);
                    if (nFlag < 0)
                    {
                        nFlag = strValue.IndexOf("9999", nIndexDot);
                    }
                    if (nFlag > 0)
                    {
                        string strFormat = "{0:0.";
                        for (int i = 0; i < nFlag - nIndexDot - 1; i++)
                        {
                            strFormat += "#";
                        }
                        strFormat += "}";
                        return string.Format(strFormat, value);
                    }
                }

                return Convert.ToString(value);
            }
            return base.ConvertTo(context, culture, value, destinationType);
        }
    }
}