using Microsoft.EntityFrameworkCore;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using Pf2eModel;
using Pf2eModel.Model;
using Pf2eModel.Model.Base;
using Pf2eModel.Model.Structure;

namespace Pf2eViewer;
internal class EntityConverter : JsonConverter
{
    private readonly 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);
    }

    private JObject ProcessEntity(JObject obj, Entity e)
    {
        List<int> traitIds = e.Traits.Select(t => t.Id).ToList();
        List<Trait> traits = _context.Traits.Where(t => traitIds.Contains(t.Id)).Include(t => t.Entity).ToList();

        foreach (JToken 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;
    }
    
    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.");
    }
}