using System.Text.Json;
using System.Text.Json.Serialization;

namespace FinalFactory.Rendezvous.Contracts;

internal abstract class StringIdentifierJsonConverter<TIdentifier> : JsonConverter<TIdentifier>
{
    public sealed override TIdentifier Read(
        ref Utf8JsonReader reader,
        Type typeToConvert,
        JsonSerializerOptions options)
    {
        if (reader.TokenType != JsonTokenType.String)
        {
            throw new JsonException($"{typeof(TIdentifier).Name} must be a JSON string.");
        }

        string value = reader.GetString() ?? string.Empty;

        try
        {
            return Parse(value);
        }
        catch (Exception exception) when (exception is ArgumentException or FormatException)
        {
            throw new JsonException($"Invalid {typeof(TIdentifier).Name}.", exception);
        }
    }

    public sealed override void Write(
        Utf8JsonWriter writer,
        TIdentifier value,
        JsonSerializerOptions options) => writer.WriteStringValue(Format(value));

    protected abstract TIdentifier Parse(string value);
    protected abstract string Format(TIdentifier value);
}