using System.Reflection;

namespace Syntriax.Engine.Serialization;

internal static class Utils
{
    internal static bool IsEnumerable(this Type type) => typeof(System.Collections.IEnumerable).IsAssignableFrom(type) && type != typeof(string);

    internal static TypeData GetTypeData(this Type objectType)
    {
        // IEnumerable<EventInfo> eventInfos = objectType.GetEvents(BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public)
        //     .OrderBy(ei => ei.Name)
        //     .ToList();
        List<FieldInfo> fieldInfos = objectType.GetFields(BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public)
            .OrderBy(ei => ei.Name) //ei => ei.FieldType.IsPrimitive || ei.FieldType == typeof(string))
                                    // .ThenByDescending(ei => ei.Name)
            .ToList();

        List<PropertyInfo> propertyInfos = objectType.GetProperties(BindingFlags.Instance | BindingFlags.Public)
            .Where(pi => pi.SetMethod is not null)
            .OrderBy(ei => ei.Name)// ei => ei.PropertyType.IsPrimitive || ei.PropertyType == typeof(string))
                                   // .ThenByDescending(ei => ei.Name)
            .ToList();

        propertyInfos.AddRange(
            objectType.GetProperties(BindingFlags.Instance | BindingFlags.NonPublic)
                .Where(pi => pi.SetMethod is not null && pi.GetCustomAttribute<SerializeAttribute>() is not null)
                .OrderBy(ei => ei.Name)// ei => ei.PropertyType.IsPrimitive || ei.PropertyType == typeof(string))
                                       // .ThenByDescending(ei => ei.Name)
                .ToList()
        );

        return new TypeData(fieldInfos, propertyInfos);
    }
}

internal record struct TypeData(IEnumerable<FieldInfo> Fields, IEnumerable<PropertyInfo> Properties)
{
    public static implicit operator (IEnumerable<FieldInfo> fields, IEnumerable<PropertyInfo> properties)(TypeData value) => (value.Fields, value.Properties);
    public static implicit operator TypeData((IEnumerable<FieldInfo> fields, IEnumerable<PropertyInfo> properties) value) => new(value.fields, value.properties);
}