using MongoDB.Bson.IO;

using MongoDB.Bson.Serialization;

using MongoDB.Bson.Serialization.Attributes;

using Newtonsoft.Json;

using Newtonsoft.Json.Converters;

using System;

using System.Text;

using System.Text.Json;

using System.Text.Json.Serialization;

using N = Newtonsoft.Json;

using SS = System.Text.Json.Serialization;

using S = System.Text.Json;

​

// would live in Echo.BDS.Widget.Domain

public interface IWidget

{

    public int Id { get; }

    public WidgetType Type { get; }

    public string Name { get; }

    public DateTime ProducedOn { get; }

}

​

public interface IEntity

{

    public DateTime CreatedAt { get; }

    public string CreatedBy { get; }

}

​

public enum WidgetType

{

    Default,

    Square,

    Round

}

​

// a basic example of some objects based on these interfaces

public class DomainWidget : IWidget

{

    public int Id { get; set; }

    public WidgetType Type { get; set; }

    public string Name { get; set; }

    public DateTime ProducedOn { get; set; }

}

​

public class JsonWidget : IWidget, IEntity

{

    public int Id { get; set; }

​

    [N.JsonConverter(typeof(StringEnumConverter))]

    public WidgetType Type { get; set; }

    public string Name { get; set; }

    public DateTime ProducedOn { get; set; }

    public DateTime CreatedAt { get; set; }

    public string CreatedBy { get; set; }

}

​

// this works, but isn't great, because it buries the JsonConverter specification

public class JsonDomainWidgetBad : IWidget

{

    public int Id { get; set; }

​

    [N.JsonConverter(typeof(StringEnumConverter))]

    public WidgetType Type { get; set; }

    public string Name { get; set; }

    public DateTime ProducedOn { get; set; }

}

​

public class JsonWidgetBad : JsonDomainWidgetBad, IEntity

{

    public DateTime CreatedAt { get; set; }

    public string CreatedBy { get; set; }

}

​

// same thing as the original JsonWidget above but with S.T.Json

public class NewJsonWidget : IWidget, IEntity

{

    public int Id { get; set; }

​

    [SS.JsonConverter(typeof(JsonStringEnumConverter))]

    public WidgetType Type { get; set; }

    public string Name { get; set; }

    public DateTime ProducedOn { get; set; }

    public DateTime CreatedAt { get; set; }

    public string CreatedBy { get; set; }

}

​

// and for Mongo

public class MongoWidget : IWidget, IEntity

{

    public int Id { get; set; }

​

    [BsonElement("widgetType")]

    public WidgetType Type { get; set; }

    public string Name { get; set; }

    public DateTime ProducedOn { get; set; }

    public DateTime CreatedAt { get; set; }

    public string CreatedBy { get; set; }

}

​

public class Program

{

    public static void Main()

    {

        var jsonWidget = new JsonWidget

        {

            Id = 5,

            Type = WidgetType.Round,

            Name = "good widget",

            ProducedOn = DateTime.Now,

            CreatedAt = DateTime.Now,

            CreatedBy = "me"

        };

        var json = N.JsonConvert.SerializeObject(jsonWidget, Formatting.Indented);

        Console.WriteLine(json);

        var jsonWidgetBad = new JsonWidgetBad

        {

            Id = 5,

            Type = WidgetType.Round,

            Name = "good widget",

            ProducedOn = DateTime.Now,

            CreatedAt = DateTime.Now,

            CreatedBy = "me"

        };

        var jsonBad = N.JsonConvert.SerializeObject(jsonWidgetBad, Formatting.Indented);

        Console.WriteLine(jsonBad);

        var newJsonWidget = new NewJsonWidget

        {

            Id = 5,

            Type = WidgetType.Round,

            Name = "good widget",

            ProducedOn = DateTime.Now,

            CreatedAt = DateTime.Now,

            CreatedBy = "me"

        };

        var newJson = S.JsonSerializer.Serialize(newJsonWidget, new JsonSerializerOptions { WriteIndented = true });

        Console.WriteLine(newJson);

        var mongoWidget = new MongoWidget

        {

            Id = 5,

            Type = WidgetType.Round,

            Name = "good widget",

            ProducedOn = DateTime.Now,

            CreatedAt = DateTime.Now,

            CreatedBy = "me"

        };

        var memoryStream = new System.IO.MemoryStream();

        var bsonWriter = new BsonBinaryWriter(memoryStream);

        BsonSerializer.Serialize(bsonWriter, mongoWidget.GetType(), mongoWidget);

        Console.WriteLine(Encoding.Default.GetString(memoryStream.GetBuffer()));

        Console.WriteLine(BitConverter.ToString(memoryStream.GetBuffer()));

    }

}