namespace CharacterEditor;
/// <summary>Authored human cuts fitted automatically to both unified body endpoints.</summary>
public static partial class UnifiedWardrobe
{
	/// <summary>Head replacements can retain skin or deliberately replace the entire neck.</summary>
	public static bool RetainsHumanNeck(Clothing item)
	{
		if (string.IsNullOrEmpty(item.HumanSkinModel)) return true;
		var skin = Model.Load(item.HumanSkinModel);
		// Use the replacement's native skin presentation. A transparent/non-skin
		// head material must not be replaced with the unified human's skin neck.
		return skin.MeshInfo.Meshes.Where(m => m.Name == "head_01")
			.SelectMany(m => m.DrawCalls).Any(d => d.Material?.ShaderName == "shaders/skin.shader");
	}

	public static string ModelPath(Clothing item, IEnumerable<Clothing> selected, TagSet tags, CharacterAppearanceData data)
	{
		var native = item.GetModel(selected.ToArray(), tags);
		if (data.BaseShape is null)
			return native;
		// Preserve conditional model overrides selected by native clothing metadata.
		if (native != item.Model && native != item.HumanAltModel && native != item.HumanAltFemaleModel)
			return native;
		// Explicit preference selects only the authored cut; the morph still uses
		// the actual body blend. Single-variant items retain their usual fallback.
		if (data.BaseShape.ClothingVariant is not null && !string.IsNullOrEmpty(item.HumanAltModel) && !string.IsNullOrEmpty(item.HumanAltFemaleModel))
		{
			var choice = data.BaseShape.ClothingVariant == "male" ? item.HumanAltModel : item.HumanAltFemaleModel;
			return choice;
		}

		// A single authored human variant is usable across the full body range.
		var preferred = data.BaseShape.MaleBody >= .5f ? item.HumanAltModel : item.HumanAltFemaleModel;
		if (string.IsNullOrEmpty(preferred))
			preferred = string.IsNullOrEmpty(item.HumanAltModel) ? item.HumanAltFemaleModel : item.HumanAltModel;
		return !string.IsNullOrEmpty(preferred) ? preferred : native;
	}

	public static Model Resolve(Clothing item, IEnumerable<Clothing> selected, TagSet tags, CharacterAppearanceData data)
	{
		var path = ModelPath(item, selected, tags, data);
		var native = Model.Load(path);
		if (data.BaseShape is null || string.IsNullOrEmpty(path) || (string.IsNullOrEmpty(item.HumanAltModel) && string.IsNullOrEmpty(item.HumanAltFemaleModel)))
			return native;
		if (item.Category.ToString().StartsWith("FacialHair") || item.Category.ToString().StartsWith("Hair"))
			return native;
		bool female = path == item.HumanAltFemaleModel && path != item.HumanAltModel;
		if (path != item.HumanAltModel && path != item.HumanAltFemaleModel)
			female = tags.Has("female");
		return AutomaticWardrobeFit.Fit(native, female, fitFace: (item.HideBody & Clothing.BodyGroups.Head) == 0);
	}

	public static void Apply(SkinnedModelRenderer renderer, CharacterAppearanceData data)
	{
		if (data.BaseShape is not null && AutomaticWardrobeFit.IsFitted(renderer.Model))
			renderer.Morphs.Set("ce_body_female", 1 - data.BaseShape.MaleBody);
	}
}// Keep hair outside body fitting.