using System;
using System.ComponentModel;
using System.Globalization;

namespace ScreenToGif.Util.Converters
{
    public class StringArrayTypeConverter : TypeConverter
    {
        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
        {
            return sourceType == typeof(string) || base.CanConvertFrom(context, sourceType);
        }

        public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
        {
            return destinationType == typeof(string) || base.CanConvertTo(context, destinationType);
        }

        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
        {
            if (!(value is string text))
                return base.ConvertFrom(context, culture, value);

            var str = text.Trim();

            return str.Length == 0 ? null : str.Split(culture.TextInfo.ListSeparator[0]);
        }

        public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
        {
            if (null == value)
                throw new ArgumentNullException(nameof(value));

            if (null == destinationType)
                throw new ArgumentNullException(nameof(destinationType));

            if (!(value is string[] array) || destinationType != typeof(string))
                return base.ConvertTo(context, culture, value, destinationType);

            var separator = culture?.TextInfo.ListSeparator[0] ?? ',';

            return string.Join(separator.ToString(), array);
        }
    }
}