using LibMMD.Material;
using UnityEngine;
using UnityEngine.Rendering;

namespace LibMMD.Unity3D
{
    public sealed class MmdBuiltInMaterialAdapter : MmdMaterialAdapterBase
    {
        public override string Id => MmdMaterialAdapterIds.Mmd;
        public override string DisplayName => "MMD";

        public override Shader ResolveShader(MmdMaterial source, MmdMaterialContext context)
        {
            return FindFirst(context.IsTransparent
                ? "MMD/Runtime/Transparent/PMDMaterial"
                : "MMD/Runtime/PMDMaterial");
        }

        public override void Apply(UnityEngine.Material target, MmdMaterial source, MmdMaterialContext context)
        {
            base.Apply(target, source, context);
            target.SetFloat("_CullMode", source.DrawDoubleFace ? (float)CullMode.Off : (float)CullMode.Back);
            target.SetFloat("_OutlineEnabled", context.EnableOutline ? 1.0f : 0.0f);
            target.SetFloat("_ReceiveShadows", context.ReceiveShadows ? 1.0f : 0.0f);
            target.SetShaderPassEnabled("Outline", context.EnableOutline);
            target.SetShaderPassEnabled("ShadowCaster", context.CastShadows);
            target.DisableKeyword("_ALPHABLEND_ON");
            target.DisableKeyword("_SURFACE_TYPE_TRANSPARENT");
            target.DisableKeyword("_RECEIVE_SHADOWS_OFF");
            target.renderQueue = -1;
            SetFloat(target, "_Opacity", source.DiffuseColor.a);
            SetColor(target, "_AmbColor", source.AmbientColor);
            SetColor(target, "_SpecularColor", source.SpecularColor);
            SetFloat(target, "_Shininess", source.Shiness);
            SetTexture(target, "_ToonTex", context.ToonTexture);
            if (context.SphereTextureType == MmdMaterial.SubTextureTypeEnum.MatSubTexSpa)
                SetTexture(target, "_SphereAddTex", context.SphereTexture);
            else if (context.SphereTextureType == MmdMaterial.SubTextureTypeEnum.MatSubTexSph)
                SetTexture(target, "_SphereMulTex", context.SphereTexture);
            SetKeyword(target, "SELFSHADOW_ON", context.EnableSelfShadow);
            SetKeyword(target, "SELFSHADOW_OFF", !context.EnableSelfShadow);
            SetFloat(target, "_SelfShadowFlat", context.ReceiveShadows ? 0.0f : 1.0f);
        }
    }
}