using System.Text.Json;
using System.Text.Json.Serialization;
using GB5Shared.JsonConverter;

namespace GB5Shared.DateConverter
{
    /// <summary>
    /// Central registration for GB5 JSON serialization.
    ///
    /// Type strategy:
    ///   DateOnly       — serializes natively as "yyyy-MM-dd"           (.NET 7+)
    ///   DateTimeOffset — serializes natively as ISO 8601 with offset   (.NET built-in)
    ///   DateTime       — legacy only; MicrosoftDateConverter handles /Date(N)/ input
    ///
    /// No custom converters needed for DateOnly or DateTimeOffset —
    /// System.Text.Json produces the correct format for those types automatically.
    /// </summary>
    public static class GB5JsonOptions
    {
        /// <summary>
        /// Registers the DateTime legacy converter.
        /// DateOnly and DateTimeOffset serialize correctly without any converter.
        /// </summary>
        public static JsonSerializerOptions AddGB5Converters(this JsonSerializerOptions options)
        {
            options.Converters.Add(new MicrosoftDateConverter());
            options.Converters.Add(new DateOnlyJsonConverter());
            options.Converters.Add(new NullableDateOnlyJsonConverter());
            options.Converters.Add(new FlexibleEnumConverterFactory());
            options.Converters.Add(new FlexibleNumberConverterFactory());
            options.NumberHandling = JsonNumberHandling.AllowReadingFromString;
            return options;
        }

        public static JsonSerializerOptions CreateDefaultOptions() => new JsonSerializerOptions
        {
            PropertyNamingPolicy = null,
            DictionaryKeyPolicy = null,
            WriteIndented = false
        }.AddGB5Converters();
    }
}