using System;

using MfGames.Gallium;
using MfGames.Nitride.Contents;

using YamlDotNet.Serialization;

namespace MfGames.Nitride.Yaml;

public static class NitrideYamlEntityExtensions
{
    /// <summary>
    /// Parses the entity text as a YAML file and returns the results. This
    /// uses the default serializer, which may be configured.
    /// </summary>
    public static TType? GetTextContentYaml<TType>(
        this Entity entity,
        Action<DeserializerBuilder>? configure = null)
    {
        DeserializerBuilder builder = new();

        configure?.Invoke(builder);

        IDeserializer deserializer = builder.Build();

        return entity.GetTextContentYaml<TType>(deserializer);
    }

    /// <summary>
    /// Parses the entity text as a YAML file using the given serializer and
    /// returns the results.
    /// </summary>
    public static TType? GetTextContentYaml<TType>(
        this Entity entity,
        IDeserializer deserializer)
    {
        string? text = entity.GetTextContentString();

        return text != null
            ? deserializer.Deserialize<TType>(text)
            : default;
    }

    /// <summary>
    /// Sets the text content to the serialized value. If this is null, then
    /// the text content is removed. This uses the default serializer which
    /// may be configured.
    /// </summary>
    /// <returns>The same entity for chaining methods.</returns>
    public static Entity SetTextContentYaml<TType>(
        this Entity entity,
        TType? value,
        Action<SerializerBuilder>? configure = null)
    {
        SerializerBuilder builder = new();

        configure?.Invoke(builder);

        ISerializer serializer = builder.Build();

        return SetTextContentYaml(entity, value, serializer);
    }

    /// <summary>
    /// Sets the text content to the serialized value using the serializer
    /// provided. If the value is null, then the text content is removed.
    /// </summary>
    /// <returns>The same entity for chaining methods.</returns>
    public static Entity SetTextContentYaml<TType>(
        this Entity entity,
        TType? value,
        ISerializer serializer)
    {
        if (value == null)
        {
            return entity.Remove<ITextContent>();
        }

        string yaml = serializer.Serialize(value);

        return entity.SetTextContent(yaml);
    }
}