using Misaki.ShaderGUI;
using UnityEditor;
using UnityEngine;

namespace Misaki.HdrpToon.Editor
{
    internal class SurfaceOptionsScope : MaterialUIScope<ShaderGUIExpandable>
    {
        private static class Properties
        {
            public static MaterialProperty transparentMode;

            public static MaterialProperty alphaClipEnable;
            public static MaterialProperty alphaClip;

            public static MaterialProperty cullMode;
            public static MaterialProperty shadingMode;
            public static MaterialProperty materialType;
            public static MaterialProperty pbrMode;

            public static MaterialProperty hairBlendingTarget;
            public static MaterialProperty surfaceFeatures;
        }

        private static class Styles
        {
            public static readonly GUIContent transparentModeText = new("Transparent Mode", "Enable different modes that allow the simulation of a variety of transparent objects.");

            public static readonly GUIContent alphaClipEnableText = new("Alpha Clipping", "Enable alpha clipping.");
            public static readonly GUIContent alphaClipText = new("Alpha Clipping Threshold", "Threshold for alpha clipping.");

            public static readonly GUIContent cullingModeText = new("Culling Mode", "Controls the sides of polygons that should not be drawn (culled).");
            public static readonly GUIContent shadingModeText = new("Shading Color Mode", "Specifies the shading grade mode.");
            public static readonly GUIContent materialTypeText = new("Material Type", "Specifies the material type.");
            public static readonly GUIContent pbrModeText = new("PBR Mode", "Specifies PBR model mode.");

            public static readonly GUIContent hairBlendingTargetText = new("Hair Blending Target", "Enable to be blended with hair");
            public static readonly GUIContent surfaceFeaturesText = new("Surface Features", "Specifies the surface features.");
        }

        protected override ShaderGUIExpandable ExpandableBit => ShaderGUIExpandable.SurfaceOptions;

        protected override GUIContent Header => EditorGUIUtility.TrTextContent("Surface Options");

        public static ShadingMode GetShadingMode()
        {
            return (ShadingMode)Properties.shadingMode.floatValue;
        }

        public static PBRMode GetPBRMode()
        {
            return (PBRMode)Properties.pbrMode.floatValue;
        }

        public static bool HasFeature(SurfaceFeatureFlags feature)
        {
            return ((SurfaceFeatureFlags)Properties.surfaceFeatures.floatValue & feature) != 0;
        }

        public override void LoadMaterialProperties()
        {
            Properties.transparentMode = FindProperty("_TransparentEnabled");

            Properties.alphaClipEnable = FindProperty("_AlphaCutoffEnable");
            Properties.alphaClip = FindProperty("_AlphaCutoff");

            Properties.cullMode = FindProperty("_CullMode");
            Properties.shadingMode = FindProperty("_Shading_Mode");
            Properties.materialType = FindProperty("_Material_Type");
            Properties.pbrMode = FindProperty("_PBR_Mode");

            Properties.hairBlendingTarget = FindProperty("_HairBlendingTarget");
            Properties.surfaceFeatures = FindProperty("_SurfaceFeatures");
        }

        protected override void DrawContent()
        {
            editor.ShaderProperty(Properties.transparentMode, Styles.transparentModeText);

            editor.ShaderProperty(Properties.alphaClipEnable, Styles.alphaClipEnableText);
            if (Properties.alphaClipEnable.floatValue == 1.0f)
            {
                EditorGUI.indentLevel++;
                editor.ShaderProperty(Properties.alphaClip, Styles.alphaClipText);
                EditorGUI.indentLevel--;
            }

            editor.ShaderProperty(Properties.cullMode, Styles.cullingModeText);
            editor.ShaderProperty(Properties.shadingMode, Styles.shadingModeText);
            editor.ShaderProperty(Properties.materialType, Styles.materialTypeText);
            editor.ShaderProperty(Properties.pbrMode, Styles.pbrModeText);

            EditorGUI.BeginChangeCheck();
            editor.ShaderProperty(Properties.hairBlendingTarget, Styles.hairBlendingTargetText);
            if (EditorGUI.EndChangeCheck())
            {
                foreach (var material in editor.GetMaterials())
                {
                    material.SetShaderPassEnabled(UtsShaderPassName.HAIR_BLENDING_TARGET_PASS_NAME, Properties.hairBlendingTarget.floatValue == 1.0f);
                }
            }

            var surfaceFeatures = (SurfaceFeatureFlags)Properties.surfaceFeatures.floatValue;
            EditorGUI.BeginChangeCheck();
            surfaceFeatures = (SurfaceFeatureFlags)EditorGUILayout.EnumFlagsField(Styles.surfaceFeaturesText, surfaceFeatures);
            if (EditorGUI.EndChangeCheck())
            {
                Properties.surfaceFeatures.floatValue = (float)surfaceFeatures;
                foreach (var material in editor.GetMaterials())
                {
                    material.SetShaderPassEnabled(UtsShaderPassName.OUTLINE_PASS_NAME, HasFeature(SurfaceFeatureFlags.Outline));
                }
            }
        }
    }
}