using UnityEngine;
using UnityEngine.Rendering.HighDefinition;

namespace Misaki.HdrpToon
{
#if UNITY_EDITOR
    [UnityEditor.InitializeOnLoad]
#endif
    public static class UTSRenderPassRegistrar
    {
        private static UTSRenderPassSettings _renderSetting;

        private static UTSPass _utsPass;
        private static UTSHairShadowPass _hairShadowPass;
        private static UTSOutlinePass _outlinePass;

        static UTSRenderPassRegistrar() => RegisterCustomPasses();

        [RuntimeInitializeOnLoadMethod]
        public static void RegisterCustomPasses()
        {
            _renderSetting = UTSRenderPassSettings.GetOrCreateSettings();
            if (_renderSetting == null)
            {
                return;
            }

            _utsPass = new UTSPass()
            {
                name = "UTS Pass",
                targetColorBuffer = CustomPass.TargetBuffer.None,
                targetDepthBuffer = CustomPass.TargetBuffer.None,
            };

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

            _outlinePass = new()
            {
                name = "UTS Outline",
                targetColorBuffer = CustomPass.TargetBuffer.None,
                targetDepthBuffer = CustomPass.TargetBuffer.None,
            };

            CustomPassVolume.RegisterUniqueGlobalCustomPass(CustomPassInjectionPoint.BeforeRendering, _utsPass);
            CustomPassVolume.RegisterUniqueGlobalCustomPass(CustomPassInjectionPoint.AfterOpaqueDepthAndNormal, _hairShadowPass);
            CustomPassVolume.RegisterUniqueGlobalCustomPass(CustomPassInjectionPoint.BeforePostProcess, _outlinePass);

            NotifyRendererSettingChanged();
        }

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

        public static void NotifyRendererSettingChanged()
        {
            if (_hairShadowPass == null || _outlinePass == null)
            {
                return;
            }

            _hairShadowPass.enabled = _renderSetting.hairShadowSetting.enable;
            _hairShadowPass.CurrentShadowQuality = _renderSetting.hairShadowSetting.shadowQuality;
            if (!_renderSetting.hairShadowSetting.enable)
            {
                _hairShadowPass.Release();
            }

            _outlinePass.enabled = _renderSetting.outlineSetting.enable;
        }
    }
}