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

namespace Misaki.HdrpToon.Editor
{
    public class RimLightScope : MaterialUIScope<ShaderGUIExpandable>
    {
        private static class Properties
        {
            public static MaterialProperty rimLightColor;
            public static MaterialProperty rimLightStrength;
            public static MaterialProperty rimLightLevel;
            public static MaterialProperty colorBlendingMode;
            public static MaterialProperty adjustRimLightArea;
            public static MaterialProperty rimLightFeatherOff;
            public static MaterialProperty lightDirection;
            public static MaterialProperty lightDirectionRimLightLevel;
            public static MaterialProperty invertedDirectionRimLight;
            public static MaterialProperty invertedRimLightColor;
            public static MaterialProperty inversedRimLightLevel;
            public static MaterialProperty invertedRimLightFeatherOff;
            public static MaterialProperty rimLightMaskMap;
            public static MaterialProperty rimLightMaskLevel;
        }

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

            public static readonly GUIContent rimLightStrengthText =
                new("Rim Light Strength", "Specifies Rim Light strength.");

            public static readonly GUIContent rimLightLevelText =
                new("Rim Light Level", "Specifies Rim Light power intensity.");

            public static readonly GUIContent colorBlendingModeText =
                new("Color Blending Mode", "Rim light color blending mode. Multiply or Add.");

            public static readonly GUIContent adjustRimLightAreaText =
                new("Adjust Rim Light Area", "Increasing this value narrows the area of influence of Rim Light.");

            public static readonly GUIContent rimLightFeatherOffText =
                new("Rim Light Feather Off", "Disable Rim light feather.");

            public static readonly GUIContent lightDirectionText =
                new("Light Direction",
                    "When Enabled, rim light is generated only in the direction of the light source.");

            public static readonly GUIContent lightDirectionRimLightLevelText =
                new("Light Direction Rim Light Level",
                    "Specifies intensity of Rim Light in the light source direction,");

            public static readonly GUIContent invertedDirectionRimLightText =
                new("Inverted Direction Rim Light", "Rim light from inverted/antipodean direction.");

            public static readonly GUIContent invertedRimLightColorText =
                new("Inverted Rim Light Color", "Specifies the color of inverted/antipodean rim light.");

            public static readonly GUIContent inversedRimLightLevelText =
                new("Inversed Rim Light Level", "Specifies Inverted/Antipodean Rim Light Level.");

            public static readonly GUIContent invertedRimLightFeatherOffText =
                new("Inverted Rim Light Feather Off", "Disable Inverted Rim light feather.");

            public static readonly GUIContent rimLightMaskMapText = new("Rim Light Mask",
                "Rim Light Mask : Texture(linear). The white part of the texture is displayed as Rim Light, and the black part is masked and not displayed.");

            public static readonly GUIContent rimLightMaskLevelText =
                new("Rim Light Mask Level",
                    "-1 gives 0% for the Rim Light effect, 0 gives 100% for the Rim Light and Mask effect, 1 gives 100% for the Rim Light and 0% for the Mask effect.");
        }

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

        public override void LoadMaterialProperties()
        {
            Properties.rimLightColor = FindProperty("_RimLightColor");
            Properties.rimLightStrength = FindProperty("_RimLightStrength");
            Properties.rimLightLevel = FindProperty("_RimLightLevel");
            Properties.colorBlendingMode = FindProperty("_Is_BlendAddToRimColor");
            Properties.adjustRimLightArea = FindProperty("_RimLight_InsideMask");
            Properties.rimLightFeatherOff = FindProperty("_RimLight_FeatherOff");
            Properties.lightDirection = FindProperty("_LightDirection_MaskOn");
            Properties.lightDirectionRimLightLevel = FindProperty("_Tweak_LightDirection_MaskLevel");
            Properties.invertedDirectionRimLight = FindProperty("_Add_Antipodean_RimLight");
            Properties.invertedRimLightColor = FindProperty("_Ap_RimLightColor");
            Properties.inversedRimLightLevel = FindProperty("_Ap_RimLight_Power");
            Properties.invertedRimLightFeatherOff = FindProperty("_Ap_RimLight_FeatherOff");
            Properties.rimLightMaskMap = FindProperty("_Set_RimLightMask");
            Properties.rimLightMaskLevel = FindProperty("_Tweak_RimLightMaskLevel");
        }

        protected override void DrawContent()
        {
            editor.ShaderProperty(Properties.rimLightColor, Styles.rimLightColorText);
            editor.ShaderProperty(Properties.rimLightStrength, Styles.rimLightStrengthText);
            editor.ShaderProperty(Properties.rimLightLevel, Styles.rimLightLevelText);
            editor.ShaderProperty(Properties.colorBlendingMode, Styles.colorBlendingModeText);
            editor.ShaderProperty(Properties.adjustRimLightArea, Styles.adjustRimLightAreaText);
            editor.ShaderProperty(Properties.rimLightFeatherOff, Styles.rimLightFeatherOffText);
            editor.ShaderProperty(Properties.lightDirection, Styles.lightDirectionText);

            using (var lightDisabledGroup = new EditorGUI.DisabledScope(!Properties.lightDirection.GetBooleanValue()))
            {
                using var lightIndentLevelScope = new EditorGUI.IndentLevelScope();

                editor.ShaderProperty(Properties.lightDirectionRimLightLevel, Styles.lightDirectionRimLightLevelText);
                editor.ShaderProperty(Properties.invertedDirectionRimLight, Styles.invertedDirectionRimLightText);

                using var invertedDirectionDisabledGroup = new EditorGUI.DisabledScope(!Properties.invertedDirectionRimLight.GetBooleanValue());
                using var invertedDirectionIndentLevelScope = new EditorGUI.IndentLevelScope();

                editor.ShaderProperty(Properties.invertedRimLightColor, Styles.invertedRimLightColorText);
                editor.ShaderProperty(Properties.inversedRimLightLevel, Styles.inversedRimLightLevelText);
                editor.ShaderProperty(Properties.invertedRimLightFeatherOff, Styles.invertedRimLightFeatherOffText);
            }

            EditorGUILayout.Space();
            editor.TexturePropertySingleLine(Styles.rimLightMaskMapText, Properties.rimLightMaskMap);
            editor.ShaderProperty(Properties.rimLightMaskLevel, Styles.rimLightMaskLevelText);
        }
    }
}