using System;

using YamlDotNet.Core;
using YamlDotNet.Core.Events;
using YamlDotNet.Serialization;

namespace Syntriax.Engine.Core.Serialization;

public class Line2DSerializer : IEngineTypeYamlSerializer
{
    public bool Accepts(Type type) => type == typeof(Line2D);

    public object? ReadYaml(IParser parser, Type type, ObjectDeserializer rootDeserializer)
    {
        parser.Consume<MappingStart>();

        if (parser.Consume<Scalar>().Value.CompareTo(nameof(Line2D.From)) != 0)
            throw new ArgumentException($"{nameof(Line2D)} mapping must start with {nameof(Line2D.From)}");
        Vector2D from = (Vector2D)rootDeserializer(typeof(Vector2D))!;

        if (parser.Consume<Scalar>().Value.CompareTo(nameof(Line2D.To)) != 0)
            throw new ArgumentException($"{nameof(Line2D)} mapping must end with {nameof(Line2D.To)}");
        Vector2D to = (Vector2D)rootDeserializer(typeof(Vector2D))!;

        parser.Consume<MappingEnd>();

        return new Line2D(from, to);
    }

    public void WriteYaml(IEmitter emitter, object? value, Type type, ObjectSerializer serializer)
    {
        Line2D line2D = (Line2D)value!;

        emitter.Emit(new MappingStart());
        emitter.Emit(new Scalar(nameof(Line2D.From)));
        serializer(line2D.From, typeof(Vector2D));
        emitter.Emit(new Scalar(nameof(Line2D.To)));
        serializer(line2D.To, typeof(Vector2D));
        emitter.Emit(new MappingEnd());
    }
}