using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using Pf2eModel;
using Pf2eModel.Model;
using Pf2eModel.Model.Base;
using Pf2eModel.Model.Structure;
using Processor = System.Func<Newtonsoft.Json.JsonWriter, object, Newtonsoft.Json.JsonSerializer, Pf2eModel.Model.Pf2eDbContext, Newtonsoft.Json.Linq.JObject>;

namespace Pf2eViewer;
internal class EntityConventor : JsonConverter
{
    private Pf2eDbContext Context = new();

    public override bool CanConvert(Type objectType)
    {
        return objectType == typeof(Entity) || objectType.IsAssignableTo(typeof(IEntity));
    }

    public override void WriteJson(JsonWriter writer, object? value, JsonSerializer serializer)
    {
        JToken token = JToken.FromObject(value!);

        if (token.Type != JTokenType.Object)
        {
            token.WriteTo(writer);
            return;
        }

        JObject obj = (JObject) token;

        switch (value)
        {
            case Entity e:
                obj = ProcessEntity(obj, e);
                break;
        }


        obj.WriteTo(writer);
    }

    JObject ProcessEntity(JObject obj, Entity e)
    {
        var traitIds = e.Traits.Select(t => t.Id).ToList();
        var traits = Context.Traits.Where(t => traitIds.Contains(t.Id)).Include(t => t.Entity).ToList();
        

        foreach (var item in (JArray) obj.SelectToken("Traits"))
        {
            JObject o = (JObject) item;
            int id = o.SelectToken("Id").ToObject<int>();

            o.Add("Name", traits.FirstOrDefault(t => t.Id == id)!.Entity.Name);
        }

        obj.Remove("Description");

        

        return obj;
    }




    private JArray GetFromSet<T>(DbSet<T> set, Func<T, bool> where) where T : Type
    {
        return new(set.Where(where).Select(JToken.FromObject).ToArray());
    }


    private JObject Process(JsonWriter writer, Entity e, JsonSerializer serializer)
    {
        JObject result = new();



        // result.Add("Aliases", GetFromSet<EntityAlias>(context.EntityAliases, o => o.Entity == e));
        result.Add("Sources", new JArray(e.Sources.Select(o => JToken.FromObject(o)).ToArray()));
        result.Add("Keywords", new JArray(e.Keywords.Select(o => JToken.FromObject(o)).ToArray()));
        result.Add("Externals", new JArray(e.Externals.Select(o => JToken.FromObject(o)).ToArray()));
        result.Add("Traits", new JArray(e.Traits.Select(o => JToken.FromObject(o)).ToArray()));

        return result;
    }








    public override bool CanRead => false;

    public override object? ReadJson(JsonReader reader, Type objectType, object? existingValue, JsonSerializer serializer)
    {
        throw new NotImplementedException("Unnecessary because CanRead is false. The type will skip the converter.");
    }


    private abstract class Conventer<T>(JsonWriter writer, T value, JsonSerializer serializer, Pf2eDbContext context)
    {
        public JsonWriter Writer { get; } = writer;
        public T Value { get; } = value;
        public JsonSerializer Serializer { get; } = serializer;
        public Pf2eDbContext Context { get; } = context;

        public abstract JObject Process();
    }

}