using System;
using System.Globalization;
using System.Web.Mvc;

namespace Kreta.Web.ModelBinder.Mvc
{
    public class DoubleModelBinder : IModelBinder
    {
        public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
        {
            ValueProviderResult valueResult = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);
            var modelState = new ModelState { Value = valueResult };
            bindingContext.ModelState[bindingContext.ModelName] = modelState;

            object actualValue = null;

            if ((valueResult != null) && !(string.IsNullOrWhiteSpace(valueResult.AttemptedValue) && (bindingContext.ModelType == typeof(double?))))
            {
                try
                {
                    actualValue = double.Parse(valueResult.AttemptedValue, NumberStyles.Number, CultureInfo.CreateSpecificCulture("hu-HU"));
                }
                catch (FormatException e)
                {
                    modelState.Errors.Add(e);
                }
            }

            return actualValue;
        }
    }
}