using System;

using Microsoft.AspNetCore.WebUtilities;

using System.Text;

using System.Collections.Generic;

using Newtonsoft.Json;

using Newtonsoft.Json.Serialization;

using System.Reflection;

using System.Linq;

#nullable enable

​

public class Program

{

    public static void Main()

    {

        ICollection<Filter> filters = 

            [

                new TextFilter() 

                {

                    TargetPropertyType = FilterTargetPropertyType.String,

                    FilterDisplayName = "Part",

                    FilterTargetProperty = "PartNo",

                    IsVisible = true,

                    FilterValue = "=1109-840-835"

                },

                new TextFilter() 

                {

                    TargetPropertyType = FilterTargetPropertyType.String,

                    FilterDisplayName = "Site",

                    FilterTargetProperty = "Contract",

                    IsVisible = true,

                    FilterValue = "=DC"

                }

            ];

        JsonSerializerSettings serializerSettings = new () 

        {

            TypeNameHandling = TypeNameHandling.Objects,

            SerializationBinder = new FilterSerializerBinder()

        };

        string json = filters.ToJSON(serializerSettings);

        Console.WriteLine(json);

        Console.WriteLine("------------------------------------");

        Console.WriteLine("");

        string base64 = filters.ToBase64FromJSON(serializerSettings);

        Console.WriteLine(base64);

        Console.WriteLine("------------------------------------");

        Console.WriteLine("");

        string jsonFromBase64 = Encoding.UTF8.GetString(WebEncoders.Base64UrlDecode(base64));

        Console.WriteLine(jsonFromBase64);

        Console.WriteLine("------------------------------------");

        Console.WriteLine("");

        ICollection<Filter> decoded = [ .. JsonConvert.DeserializeObject<IEnumerable<Filter>>(jsonFromBase64, serializerSettings)]; 

        foreach (Filter f in decoded) 

        {

            Console.WriteLine(f.ToString());

        }

    }

}

​

public static class CollectionExtensions

{

    public static string ToJSON<TSource>(this ICollection<TSource> source, JsonSerializerSettings? jsonSerializerSettings = default) =>

        jsonSerializerSettings is not null ? JsonConvert.SerializeObject(source, jsonSerializerSettings) : JsonConvert.SerializeObject(source);

​

    public static string ToBase64FromJSON<TSource>(this ICollection<TSource> source, JsonSerializerSettings? jsonSerializerSettings = default) => WebEncoders.Base64UrlEncode(Encoding.UTF8.GetBytes(source.ToJSON(jsonSerializerSettings)));

}

​

public class FilterSerializerBinder : ISerializationBinder

{

    public List<Type> Types { get; set; } = [typeof(Filter), typeof(TextFilter)];

​

    public void BindToName(Type serializedType, out string? assemblyName, out string? typeName)

    {

        assemblyName = Assembly.GetAssembly(serializedType)?.FullName;

        typeName = serializedType.Name;

    }

​

    public Type BindToType(string? assemblyName, string typeName)

    {

        return Types.Single(t => t.Name == typeName);

    }

}

​

public abstract record Filter 

{

    public abstract bool HasValue { get; }

​

    public virtual bool IsVisible { get; set; } = false;

​

    public required virtual string FilterDisplayName { get; init; }

​

    public required virtual string FilterTargetProperty { get; init; }

​

    //public virtual string ToJSON() => Newtonsoft.Json.JsonConvert.SerializeObject(this);

​

    //public virtual string ToBase64() => WebEncoders.Base64UrlEncode(Encoding.UTF8.GetBytes(ToJSON())); 

​

}

​

public sealed record class TextFilter : Filter

{

    public override bool HasValue => IsVisible && !string.IsNullOrWhiteSpace(FilterValue);

​

    public string FilterValue

    {

        get => _FilterValue;

        set

        {

            _FilterValue = value ?? string.Empty;

        }

    }

    private string _FilterValue = string.Empty;

​

    public required FilterTargetPropertyType TargetPropertyType { get; init; }

​

}

​

public enum FilterTargetPropertyType

{

    String,

    Decimal

}