using System;
using System.Globalization;
using System.Windows.Data;

namespace HMI.Core
{
    public class WidthSizeConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            /// "{size},{基准值},{最小值},{最大值}"
            if (parameter == null) return 15;

            string[] ps = parameter.ToString().Split(',');
            double size = double.Parse(ps[0]);
            double baseSize = double.Parse(ps[1]);
            double min = -1, max = -1;

            if (ps.Length >= 3)
            {
                min = double.Parse(ps[2]);
            }
            if (ps.Length >= 4)
            {
                max = double.Parse(ps[3]);
            }

            if (value is double width)
            {
                double res = CountFontSize(size, width, baseSize);
                res = min > 0 && res < min ? min : res;
                res = max > 0 && res > max ? max : res;
                return res;
            }
            return 15;
        }

        public static double CountFontSize(double size, double limit, double baseSize)
        {
            return size * limit / baseSize;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }

    public class HeightSizeConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (parameter == null) return 15;

            string[] ps = parameter.ToString().Split(',');
            int size = int.Parse(ps[0]);
            int baseSize = int.Parse(ps[1]);
            double min = -1, max = -1;

            if (ps.Length >= 3)
            {
                min = double.Parse(ps[2]);
            }
            if (ps.Length >= 4)
            {
                max = double.Parse(ps[3]);
            }
            if (value is double height)
            {
                double res = CountFontSize(size, height, baseSize);
                res = min > 0 && res < min ? min : res;
                res = max > 0 && res > max ? max : res;
                return res;
            }
            return 15;
        }

        public static double CountFontSize(double size, double limit, double baseSize)
        {
            return size * limit / baseSize;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}