using System;

using Engine.Core;

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

namespace Engine.Serializers.Yaml;

public class AABB2DConverter : EngineTypeYamlSerializerBase<AABB2D>
{
    public override AABB2D Read(IParser parser, Type type, ObjectDeserializer rootDeserializer)
    {
        parser.Consume<MappingStart>();

        if (parser.Consume<Scalar>().Value.CompareTo(nameof(AABB2D.LowerBoundary)) != 0)
            throw new ArgumentException($"{nameof(AABB2D)} mapping must start with {nameof(AABB2D.LowerBoundary)}");
        Vector2D lowerBoundary = (Vector2D)rootDeserializer(typeof(Vector2D))!;

        if (parser.Consume<Scalar>().Value.CompareTo(nameof(AABB2D.UpperBoundary)) != 0)
            throw new ArgumentException($"{nameof(AABB2D)} mapping must end with {nameof(AABB2D.UpperBoundary)}");
        Vector2D upperBoundary = (Vector2D)rootDeserializer(typeof(Vector2D))!;

        parser.Consume<MappingEnd>();

        return new AABB2D(lowerBoundary, upperBoundary);
    }

    public override void WriteYaml(IEmitter emitter, object? value, Type type, ObjectSerializer serializer)
    {
        AABB2D aabb = (AABB2D)value!;

        emitter.Emit(new MappingStart());
        emitter.Emit(new Scalar(nameof(AABB2D.LowerBoundary)));
        serializer(aabb.LowerBoundary, typeof(Vector2D));
        emitter.Emit(new Scalar(nameof(AABB2D.UpperBoundary)));
        serializer(aabb.UpperBoundary, typeof(Vector2D));
        emitter.Emit(new MappingEnd());
    }
}