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

namespace Tango.DispenserAnalyzer.UI.Converters
{
    public class ObjectToDoubleConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (!(value is double))
                return null;
            return (double)value;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if(value is string)
            {
                return GetDouble((string)value, 0.0);
            }
            return (double)value;
        }
        public double GetDouble(string value, double defaultValue)
        {
            double result;

            // Try parsing in the current culture
            if (!double.TryParse(value, System.Globalization.NumberStyles.Any, CultureInfo.CurrentCulture, out result) &&
                // Then try in US english
                !double.TryParse(value, System.Globalization.NumberStyles.Any, CultureInfo.GetCultureInfo("en-US"), out result) &&
                // Then in neutral language
                !double.TryParse(value, System.Globalization.NumberStyles.Any, CultureInfo.InvariantCulture, out result))
            {
                result = defaultValue;
            }
            return result;
        }
    }
}