using System;
using System.ServiceModel.Dispatcher;
using System.Text;

namespace Sony.Filtr.API.WCF
{
    public class ArraySupportConverter : QueryStringConverter
    {
        readonly QueryStringConverter _inner;
        public ArraySupportConverter(QueryStringConverter inner)
        {
            this._inner = inner;
        }
        public override bool CanConvert(Type type)
        {
            var underlyingType = Nullable.GetUnderlyingType(type);

            return (underlyingType != null && base.CanConvert(underlyingType)) || type == typeof(string[]) || _inner.CanConvert(type);
        }
        public override object ConvertStringToValue(string parameter, Type parameterType)
        {
            if (parameter != null)
            {
                if (parameterType == typeof(string[]))
                {
                    string[] parts = parameter.Split(',');
                    var result = new string[parts.Length];
                    for (var i = 0; i < parts.Length; i++) result[i] = parts[i];
                    return result;
                }

                var underlyingType = Nullable.GetUnderlyingType(parameterType);
                // Handle nullable types
                if (underlyingType != null)
                {
                    // Define a null value as being an empty or missing (null) string passed as the query parameter value
                    return String.IsNullOrEmpty(parameter) ? null : base.ConvertStringToValue(parameter, underlyingType);
                }

                return base.ConvertStringToValue(parameter, parameterType);
            }
            return null;
        }

        // The override below is not needed if used only at the server
        public override string ConvertValueToString(object parameter, Type parameterType)
        {
            if (parameterType == typeof(string[]))
            {
                var intArray = (string[])parameter;
                var sb = new StringBuilder();
                for (int i = 0; i < intArray.Length; i++)
                {
                    if (i > 0) sb.Append(',');
                    sb.Append(intArray[i]);
                }

                return sb.ToString();
            }

            return _inner.ConvertValueToString(parameter, parameterType);
        }
    }
}