using Robust.Shared.Reflection;
using Robust.Shared.Serialization;
using Robust.Shared.Serialization.Manager;
using Robust.Shared.Serialization.Markdown;
using Robust.Shared.Serialization.Markdown.Mapping;
using Robust.Shared.Serialization.Markdown.Validation;
using Robust.Shared.Serialization.TypeSerializers.Interfaces;
using Robust.Shared.Utility;

namespace Content.Server.NPC;

public sealed class NPCBlackboardSerializer : ITypeReader<NPCBlackboard, MappingDataNode>, ITypeCopier<NPCBlackboard>
{
    public ValidationNode Validate(ISerializationManager serializationManager, MappingDataNode node,
        IDependencyCollection dependencies, ISerializationContext? context = null)
    {
        var validated = new List<ValidationNode>();

        if (node.Count > 0)
        {
            var reflection = dependencies.Resolve<IReflectionManager>();

            foreach (var data in node)
            {
                var key = data.Key.ToYamlNode().AsString();

                if (data.Value.Tag == null)
                {
                    validated.Add(new ErrorNode(data.Key, $"Unable to validate {key}'s type"));
                    continue;
                }

                var typeString = data.Value.Tag[6..];

                if (!reflection.TryLooseGetType(typeString, out var type))
                {
                    validated.Add(new ErrorNode(data.Key, $"Unable to find type for {typeString}"));
                    continue;
                }

                var validatedNode = serializationManager.ValidateNode(type, data.Value, context);
                validated.Add(validatedNode);
            }
        }

        return new ValidatedSequenceNode(validated);
    }

    public NPCBlackboard Read(ISerializationManager serializationManager, MappingDataNode node,
        IDependencyCollection dependencies,
        SerializationHookContext hookCtx, ISerializationContext? context = null,
        ISerializationManager.InstantiationDelegate<NPCBlackboard>? instanceProvider = null)
    {
        var value = instanceProvider != null ? instanceProvider() : new NPCBlackboard();

        if (node.Count > 0)
        {
            var reflection = dependencies.Resolve<IReflectionManager>();

            foreach (var data in node)
            {
                var key = data.Key.ToYamlNode().AsString();

                if (data.Value.Tag == null)
                    throw new NullReferenceException($"Found null tag for {key}");

                var typeString = data.Value.Tag[6..];

                if (!reflection.TryLooseGetType(typeString, out var type))
                    throw new NullReferenceException($"Found null type for {key}");

                var bbData = serializationManager.Read(type, data.Value, hookCtx, context);

                if (bbData == null)
                    throw new NullReferenceException($"Found null data for {key}, expected {type}");

                value.SetValue(key, bbData);
            }
        }

        return value;
    }

    public void CopyTo(
        ISerializationManager serializationManager,
        NPCBlackboard source,
        ref NPCBlackboard target,
        SerializationHookContext hookCtx,
        ISerializationContext? context = null)
    {
        target.Clear();
        using var enumerator = source.GetEnumerator();

        while (enumerator.MoveNext())
        {
            var current = enumerator.Current;
            target.SetValue(current.Key, current.Value);
        }
    }
}