using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Controls;
using System.Windows.Input;

namespace WpfControlLibrary.IpAddress
{
    public class IPRangeValidationRule : ValidationRule
    {
        private int _min;
        private int _max;

        public int Min
        {
            get { return _min; }
            set { _min = value; }
        }

        public int Max
        {
            get { return _max; }
            set { _max = value; }
        }

        public override ValidationResult Validate(object value, CultureInfo cultureInfo)
        {
            int val = 0;
            var strVal = (string)value;
            try
            {
                if ( strVal.Length > 0 )
                {
                    if ( strVal.EndsWith(".") )
                    {
                        return CheckRanges(strVal.Replace(".", ""));
                    }

                    // Allow dot character to move to next box
                    return CheckRanges(strVal);
                }
            }
            catch ( Exception e )
            {
                return new ValidationResult(false, "Illegal characters or " + e.Message);
            }

            if ( ( val < Min ) || ( val > Max ) )
            {
                return new ValidationResult(false,
                  "Please enter the value in the range: " + Min + " - " + Max + ".");
            }
            else
            {
                return ValidationResult.ValidResult;
            }
        }

        private ValidationResult CheckRanges(string strVal)
        {
            if ( int.TryParse(strVal, out var res) )
            {
                if ( ( res < Min ) || ( res > Max ) )
                {
                    return new ValidationResult(false,
                      "Please enter the value in the range: " + Min + " - " + Max + ".");
                }
                else
                {
                    return ValidationResult.ValidResult;
                }
            }
            else
            {
                return new ValidationResult(false, "Illegal characters entered");
            }
        }
    }
}