using System.IO;
using UnityEngine;
using UnityEngine.Rendering.HighDefinition;

namespace Unity.Toonshader
{
#if UNITY_EDITOR
    [UnityEditor.InitializeOnLoad]
#endif
    public static class RegisterUTSRenderPass
    {
        private static readonly UTSRenderPassSetting _renderSetting;

        private static readonly UTSOutlinePass _outlinePass;
        private static readonly UTSHairShadowPass _hairShadowPass;

        static RegisterUTSRenderPass()
        {
            var assetPath = Path.GetFileNameWithoutExtension(UTSRenderPassSetting.RENDERER_SETTING_ASSET_PATH);
            _renderSetting = Resources.Load<UTSRenderPassSetting>(assetPath);

            if (_renderSetting == null)
            {
                return;
            }

            _outlinePass = new()
            {
                name = "UTS Outline",
                layerMask = _renderSetting.outlineSetting.layerMask
            };

            _hairShadowPass = new()
            {
                name = "UTS Hair Shadow Map",
                layerMask = _renderSetting.hairShadowSetting.casterLayerMask,
                targetColorBuffer = CustomPass.TargetBuffer.None,
                targetDepthBuffer = CustomPass.TargetBuffer.None,
            };

            RegisterCustomPasses();
        }

        [RuntimeInitializeOnLoadMethod]
        public static void RegisterCustomPasses()
        {
            CustomPassVolume.RegisterUniqueGlobalCustomPass(CustomPassInjectionPoint.AfterOpaqueAndSky, _outlinePass);
            CustomPassVolume.RegisterUniqueGlobalCustomPass(CustomPassInjectionPoint.AfterOpaqueDepthAndNormal, _hairShadowPass);

            _outlinePass.enabled = _renderSetting.outlineSetting.enable;
            _hairShadowPass.SetEnable(_renderSetting.hairShadowSetting.enable);
        }

        public static void UnregisterGlobalCustomPass()
        {
            CustomPassVolume.UnregisterGlobalCustomPass(_outlinePass);
            CustomPassVolume.UnregisterGlobalCustomPass(_hairShadowPass);
            _hairShadowPass.Release();
        }

        public static void NotifyRendererSettingChanged()
        {
            _outlinePass.enabled = _renderSetting.outlineSetting.enable;
            _outlinePass.layerMask = _renderSetting.outlineSetting.layerMask;

            _hairShadowPass.SetEnable(_renderSetting.hairShadowSetting.enable);
            _hairShadowPass.layerMask = _renderSetting.hairShadowSetting.casterLayerMask;
        }
    }
}