using Misaki.ShaderGUI;
using UnityEditor;
using UnityEngine;

using static Misaki.HdrpToon.UTSPropertyName.SurfaceOptions;

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

            public static MaterialProperty fogOnTransparent;
            public static MaterialProperty transparentDepthPrepassEnable;
            public static MaterialProperty transparentDepthPostpassEnable;
            public static MaterialProperty transparentBackfaceEnable;
            public static MaterialProperty transparentZWrite;
            public static MaterialProperty receivesSSRTransparent;
            public static MaterialProperty transparentWritingMotionVec;

            public static MaterialProperty alphaClipEnable;
            public static MaterialProperty alphaClip;
            public static MaterialProperty cullMode;
            public static MaterialProperty doubleSidedNormalMode;

            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("Surface Type", "Controls the surface type of the material.");
            public static readonly GUIContent fogOnTransparentText = new("Fog On Transparent", "Enable to apply fog effect on transparent objects.");
            public static readonly GUIContent transparentDepthPrepassEnableText = new("Depth Prepass", "Enable to perform a depth prepass for transparent objects.");
            public static readonly GUIContent transparentDepthPostpassEnableText = new("Depth Postpass", "Enable to perform a depth postpass for transparent objects.");
            public static readonly GUIContent transparentBackfaceEnableText = new("Back Then Front Rendering", "Enable to render the back faces of transparent objects first, then the front faces.");
            public static readonly GUIContent transparentZWriteText = new("Depth Write", "Enable to write depth for transparent objects. This is useful for correct depth testing with other transparent objects.");
            public static readonly GUIContent receivesSSRTransparentText = new("Receives SSR", "Enable to allow transparent objects to receive Screen Space Reflections (SSR).");
            public static readonly GUIContent transparentWritingMotionVec = new("Motion Vectors Write", "Enable to write motion vectors for 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 doubleSidedNormalModeText = new("Double Sided Mode", "Controls the normal mode for double-sided rendering.");

            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");

        protected override void LoadMaterialProperties()
        {
            Properties.surfaceType = FindProperty(SURFACE_TYPE);

            Properties.fogOnTransparent = FindProperty(FOG_ON_TRANSPARENT);
            Properties.transparentDepthPrepassEnable = FindProperty(TRANSPARENT_DEPTH_PREPASS_ENABLE);
            Properties.transparentDepthPostpassEnable = FindProperty(TRANSPARENT_DEPTH_POSTPASS_ENABLE);
            Properties.transparentBackfaceEnable = FindProperty(TRANSPARENT_BACKFACE_ENABLE);
            Properties.transparentZWrite = FindProperty(TRANSPARENT_Z_WRITE);
            Properties.receivesSSRTransparent = FindProperty(RECEIVES_SSR_TRANSPARENT);
            Properties.transparentWritingMotionVec = FindProperty(TRANSPARENT_WRITING_MOTION_VEC);

            Properties.alphaClipEnable = FindProperty(ALPHA_CLIP_ENABLE);
            Properties.alphaClip = FindProperty(ALPHA_CUTOFF);
            Properties.cullMode = FindProperty(CULL_MODE);
            Properties.doubleSidedNormalMode = FindProperty(DOUBLE_SIDED_NORMAL_MODE);

            Properties.shadingMode = FindProperty(SHADING_MODE);
            Properties.materialType = FindProperty(MATERIAL_TYPE);
            Properties.pbrMode = FindProperty(PBR_MODE);

            Properties.hairBlendingTarget = FindProperty(HAIR_BLENDING_TARGET);
            Properties.surfaceFeatures = FindProperty(SURFACE_FEATURE);
        }

        protected override void DrawContent()
        {
            editor.ShaderProperty(Properties.surfaceType, Styles.transparentModeText);
            using (new EditorGUI.IndentLevelScope())
            {
                if (Properties.surfaceType.GetBooleanValue())
                {
                    editor.ShaderProperty(Properties.fogOnTransparent, Styles.fogOnTransparentText);
                    editor.ShaderProperty(Properties.transparentDepthPrepassEnable, Styles.transparentDepthPrepassEnableText);
                    editor.ShaderProperty(Properties.transparentDepthPostpassEnable, Styles.transparentDepthPostpassEnableText);
                    editor.ShaderProperty(Properties.transparentBackfaceEnable, Styles.transparentBackfaceEnableText);
                    editor.ShaderProperty(Properties.transparentZWrite, Styles.transparentZWriteText);
                    editor.ShaderProperty(Properties.receivesSSRTransparent, Styles.receivesSSRTransparentText);
                    editor.ShaderProperty(Properties.transparentWritingMotionVec, Styles.transparentWritingMotionVec);
                }

                editor.ShaderProperty(Properties.cullMode, Styles.cullingModeText);
                if (Properties.cullMode.intValue == 0)
                {
                    using (new EditorGUI.IndentLevelScope())
                    {
                        editor.ShaderProperty(Properties.doubleSidedNormalMode, Styles.doubleSidedNormalModeText);
                    }
                }
            }

            editor.ShaderProperty(Properties.alphaClipEnable, Styles.alphaClipEnableText);
            if (Properties.alphaClipEnable.GetBooleanValue())
            {
                using var s = new EditorGUI.IndentLevelScope();
                editor.ShaderProperty(Properties.alphaClip, Styles.alphaClipText);
            }

            editor.ShaderProperty(Properties.shadingMode, Styles.shadingModeText);
            editor.ShaderProperty(Properties.materialType, Styles.materialTypeText);
            editor.ShaderProperty(Properties.pbrMode, Styles.pbrModeText);
            editor.ShaderProperty(Properties.hairBlendingTarget, Styles.hairBlendingTargetText);
            editor.ShaderProperty(Properties.surfaceFeatures, Styles.surfaceFeaturesText);
        }
    }
}