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

namespace LibMMD.Unity3D
{
    public sealed class LitMmdMaterialAdapter : MmdMaterialAdapterBase
    {
        public override string Id => MmdMaterialAdapterIds.Lit;
        public override string DisplayName => "Lit";
        public override MmdMaterialSettings SupportedSettings =>
            MmdMaterialSettings.ReceiveShadows |
            MmdMaterialSettings.CastShadows |
            MmdMaterialSettings.Outline |
            MmdMaterialSettings.TextureAlphaScan;
        public override Shader ResolveShader(MmdMaterial source, MmdMaterialContext context) => FindFirst(
            context.IsTransparent ? "MMD/Runtime/Standard Transparent" : "MMD/Runtime/Standard");

        public override void Apply(UnityEngine.Material target, MmdMaterial source, MmdMaterialContext context)
        {
            base.Apply(target, source, context);
            SetColor(target, "_BaseColor", source.DiffuseColor);
            SetTexture(target, "_BaseMap", context.MainTexture);
            SetFloat(target, "_WorkflowMode", 0.0f);
            SetColor(target, "_SpecColor", source.SpecularColor);
            SetFloat(target, "_Metallic", 0.0f);
            SetFloat(target, "_Smoothness", Mathf.Clamp01(source.Shiness / 128.0f));
            SetFloat(target, "_Glossiness", Mathf.Clamp01(source.Shiness / 128.0f));
            SetFloat(target, "_Surface", context.IsTransparent ? 1.0f : 0.0f);
            SetFloat(target, "_Blend", 0.0f);
            SetFloat(target, "_AlphaClip", 0.0f);
            SetFloat(target, "_Cull", source.DrawDoubleFace ? (float)CullMode.Off : (float)CullMode.Back);
            SetKeyword(target, "_RECEIVE_SHADOWS_OFF", !context.ReceiveShadows);
            SetKeyword(target, "_SPECULAR_SETUP", true);
            SetKeyword(target, "_ALPHATEST_ON", false);
            SetFloat(target, "_CastShadows", context.CastShadows ? 1.0f : 0.0f);
            SetFloat(target, "_ReceiveShadows", context.ReceiveShadows ? 1.0f : 0.0f);
            target.SetShaderPassEnabled("ShadowCaster", context.CastShadows);
            ConfigureBlend(target, context.IsTransparent, "_SURFACE_TYPE_TRANSPARENT");
            target.SetOverrideTag("RenderType", context.IsTransparent ? "Transparent" : "Opaque");
            target.doubleSidedGI = source.DrawDoubleFace;
        }
    }
}