using Misaki.ShaderGUI;
using UnityEditor;
using UnityEngine;

namespace Misaki.HdrpToon.Editor
{
    internal class ShadowScope : MaterialUIScope<ShaderGUIExpandable>
    {
        private static class Properties
        {
            public static MaterialProperty receiveLightShadow;
            public static MaterialProperty receiveScreenSpaceShadow;
            public static MaterialProperty receiveHairShadow;

            public static MaterialProperty shadowDistanceBias;
            public static MaterialProperty shadowNormalBias;
        }

        private static class Styles
        {
            public static readonly GUIContent receiveLightShadowText = new("Receive Light Shadow", "Enable to receive shadow from light.");
            public static readonly GUIContent receiveHairShadowText = new("Receive Hair Shadow", "Enable to receive shadow from hair shadow caster");

            public static readonly GUIContent receiveScreenSpaceShadowText = new("Receive Screen Space Shadow", "Enable to receive screen space shadow.");
            public static readonly GUIContent lightShadowBiasText = new("Light Shadow Bias", "Specifies the bias of the light shadow.");
            public static readonly GUIContent lightShadowNormalBiasText = new("Light Shadow Normal Bias", "Specifies the normal bias of the light shadow.");
        }

        protected override ShaderGUIExpandable ExpandableBit => ShaderGUIExpandable.Shadow;

        protected override GUIContent Header => EditorGUIUtility.TrTextContent("Shadow Settings");

        protected override void LoadMaterialProperties()
        {
            Properties.receiveLightShadow = FindProperty("_Receive_Light_Shadow");
            Properties.receiveScreenSpaceShadow = FindProperty("_Receive_Screen_Space_Shadow");
            Properties.receiveHairShadow = FindProperty("_Receive_Hair_Shadow");

            Properties.shadowDistanceBias = FindProperty("_ShadowDistanceBias");
            Properties.shadowNormalBias = FindProperty("_ShadowNormalBias");
        }

        protected override void DrawContent()
        {
            editor.ShaderProperty(Properties.receiveLightShadow, Styles.receiveLightShadowText);
            if (Properties.receiveLightShadow.GetBooleanValue())
            {
                editor.ShaderProperty(Properties.receiveScreenSpaceShadow, Styles.receiveScreenSpaceShadowText);
            }
            editor.ShaderProperty(Properties.receiveHairShadow, Styles.receiveHairShadowText);

            EditorGUILayout.Space();
            editor.ShaderProperty(Properties.shadowDistanceBias, Styles.lightShadowBiasText);
            editor.ShaderProperty(Properties.shadowNormalBias, Styles.lightShadowNormalBiasText);
        }
    }
}