using System;
using System.Collections;
using System.Collections.Generic;
using System.Text.RegularExpressions;
using log4net;
using Sleis.Models;
using Sleis.Utility;
using Sleis.ViewModels;
using Spring.Validation;
using System.Text;

namespace Sleis.Validation.Spring
{
    public class DecimalValidator : RegularExpressionValidator
    {
        public string PrecisionFormat
        {
            get;
            set;
        }
        internal static ILog Log;


        public DecimalValidator()
        {
            Log = LogManager.GetLogger(this.GetType());            
        }
        

        public override bool Validate(object validationContext, System.Collections.IDictionary contextParams, IValidationErrors errors)
        {
            //don't worry about being required.  let required attribute handle that 
            Log.DebugFormat("Validate({0},{1},{2})", validationContext, contextParams, errors);
            base.Expression = Pattern(PrecisionFormat);
            return base.Validate(validationContext, contextParams, errors);   
       
        }
        
        public static string Pattern(string precisionFormat)
        {
            string[] vals = precisionFormat.Split(',');
            //(\d{1,3}'(\d{3}')*\d{3}
            StringBuilder pattern = new StringBuilder(@"^-?0*\d{0,");
            pattern.Append(vals[0]);
            pattern.Append(@"}(\.\d{0,");
            pattern.Append(vals[1]);
            pattern.Append(@"})?$");
            return pattern.ToString();

        }
        protected override bool Validate(object objectToValidate)
        {
            //Decimal d = Convert.ToDecimal(objectToValidate);
            //Possibly do tostring("G28") in which G specifies most compact fixed point.....this would remove trailing zeros, but would also convert val to scientific notation....
            //string val = d.ToString();
            return base.Validate(objectToValidate);
        }
         
    }
}