using System.Collections.Immutable;
using System.Text.Json;
using System.Text.Json.Serialization;
using Observatory.Framework.Files.ParameterTypes;

namespace Observatory.Framework.Files.Converters;

/// <summary>
/// The format used for materials changed from an object with a key for each material to an array of objects containing "name" and "percent".
/// Need to handle both if we're going to read historical data. This reads the old format into a class reflecting the new structure.
/// </summary>
public class MaterialConverter : JsonConverter<ImmutableList<Material>>
{
    public override ImmutableList<Material> Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
    {
            if (reader.TokenType == JsonTokenType.StartObject)
            {
                var materialComposition = new List<Material>();
                while (reader.Read())
                {
                    if (reader.TokenType != JsonTokenType.EndObject)
                    {
                        if (reader.TokenType == JsonTokenType.PropertyName)
                        {
                            var name = reader.GetString();
                            reader.Read();
                            var count = reader.GetInt32();
                            var material = new Material
                            {
                                Name = name,
                                Name_Localised = name,
                                Count = count
                            };
                            materialComposition.Add(material);
                        }
                    }
                    else
                    {
                        break;
                    }
                }
                return materialComposition.ToImmutableList();
            }

            return (ImmutableList<Material>)JsonSerializer.Deserialize(ref reader, typeof(ImmutableList<Material>));
        }

    public override void Write(Utf8JsonWriter writer, ImmutableList<Material> value, JsonSerializerOptions options)
    {
            throw new NotImplementedException();
        }
}