using Misaki.ShaderGUI;
using System.Linq;
using UnityEditor;
using UnityEngine;

using static Misaki.HdrpToon.UTSPropertyName.RimLight;

namespace Misaki.HdrpToon.Editor
{
    public class RimLightScope : MaterialUIScope<ShaderGUIExpandable>
    {
        private static class Properties
        {
            public static MaterialProperty rimLightColor;
            public static MaterialProperty rimLightIntensity;

            public static MaterialProperty albedoAffectRimLight;
            public static MaterialProperty screenSpaceRimLight;
            public static MaterialProperty rimLightLevel;
            public static MaterialProperty rimLightClipping;
            public static MaterialProperty rimLightClippingLevel;

            public static MaterialProperty lightBaseRimLight;
            public static MaterialProperty lightDirectionRimLightLevel;
        }

        private static class Styles
        {
            public static readonly GUIContent rimLightColorText = new("Rim Light Color", "Specifies the color of rim light.");
            public static readonly GUIContent rimLightIntensityText = new("Rim Light Strength", "Specifies Rim Light strength.");

            public static readonly GUIContent albedoAffectRimLightText = new("Albedo Affect Rim Light", "Enable to let the albedo color affect the rim light color. The alpha channel of rim light color will be the blending weight.");
            public static readonly GUIContent screenSpaceRimLightText = new("Screen Space Rim Light", "Enable to make the rim light width constant in screen space.");
            public static readonly GUIContent rimLightLevelText = new("Rim Light Level", "Specifies Rim Light power intensity.");
            public static readonly GUIContent rimLightClippingText = new("Rim Light Clipping", "Enable to Clip the rim light at specific level");
            public static readonly GUIContent rimLightClippingLevelText = new("Clipping Level", "The Clipping value of the rim light.");

            public static readonly GUIContent lightBaseRimLightText = new("Light Base Rim Light", "Enable to let rim light calculate per light.");
            public static readonly GUIContent lightDirectionRimLightLevelText = new("Light Direction Level", "Specifies intensity of Rim Light in the light source direction,");
        }

        protected override ShaderGUIExpandable ExpandableBit => ShaderGUIExpandable.Rimlight;
        protected override GUIContent Header => EditorGUIUtility.TrTextContent("Rim Light Settings");
        protected override bool ShowSection => materials.All(mat => mat.HasFeature(SurfaceFeature.RimLight));

        public override void LoadMaterialProperties()
        {
            Properties.rimLightColor = FindProperty(RIM_LIGHT_COLOR);
            Properties.rimLightIntensity = FindProperty(RIM_LIGHT_INTENSITY);

            Properties.albedoAffectRimLight = FindProperty(ALBEDO_AFFECT_RIM_LIGHT);
            Properties.screenSpaceRimLight = FindProperty(SCREEN_SPACE_RIM_LIGHT);
            Properties.rimLightLevel = FindProperty(RIM_LIGHT_LEVEL);
            Properties.rimLightClipping = FindProperty(RIM_LIGHT_CLIPPING);
            Properties.rimLightClippingLevel = FindProperty(RIM_LIGHT_CLIPPING_LEVEL);

            Properties.lightBaseRimLight = FindProperty(LIGHT_BASE_RIM_LIGHT);
            Properties.lightDirectionRimLightLevel = FindProperty(LIGHT_DIRECTION_RIM_LIGHT_LEVEL);
        }

        protected override void DrawContent()
        {
            editor.ShaderProperty(Properties.rimLightColor, Styles.rimLightColorText);
            editor.ShaderProperty(Properties.rimLightIntensity, Styles.rimLightIntensityText);

            editor.ShaderProperty(Properties.albedoAffectRimLight, Styles.albedoAffectRimLightText);
            editor.ShaderProperty(Properties.screenSpaceRimLight, Styles.screenSpaceRimLightText);
            editor.ShaderProperty(Properties.rimLightLevel, Styles.rimLightLevelText);

            if (!Properties.screenSpaceRimLight.GetBooleanValue())
            {
                editor.ShaderProperty(Properties.rimLightClipping, Styles.rimLightClippingText);
                if (Properties.rimLightClipping.GetBooleanValue())
                {
                    using var clippingLevelIndentLevelScope = new EditorGUI.IndentLevelScope();
                    editor.ShaderProperty(Properties.rimLightClippingLevel, Styles.rimLightClippingLevelText);
                }
            }

            EditorGUILayout.Space();
            editor.ShaderProperty(Properties.lightBaseRimLight, Styles.lightBaseRimLightText);
            if (Properties.lightBaseRimLight.GetBooleanValue())
            {
                editor.ShaderProperty(Properties.lightDirectionRimLightLevel, Styles.lightDirectionRimLightLevelText);
            }
        }
    }
}