//pipelinedefine
#define H_URP

using System.Collections.Generic;
using HTraceWSGI.Scripts.Data.Private;
using HTraceWSGI.Scripts.Data.Public;
using HTraceWSGI.Scripts.Globals;
using HTraceWSGI.Scripts.Infrastructure.URP;
using HTraceWSGI.Scripts.Passes.Shared;
using HTraceWSGI.Scripts.Passes.URP;
using HTraceWSGI.Scripts.Services;
using HTraceWSGI.Scripts.Services.DirectionalShadowmap;
using HTraceWSGI.Scripts.Services.VoxelCameras;
using HTraceWSGI.Scripts.Services.LightsCluster;
using LightingSettings = HTraceWSGI.Scripts.Data.Public.LightingSettings;
using UnityEngine;
using UnityEngine.Rendering;

#if UNITY_EDITOR
using UnityEditor;
using HTraceWSGI.Scripts.PipelinesConfigurator;
#endif


namespace HTraceWSGI.Scripts
{
	[ExecuteInEditMode, DefaultExecutionOrder(100)]
	[HelpURL(HNames.HTRACE_WSGI_DOCUMENTATION_LINK)]
	public class HTraceWSGI : MonoBehaviour
	{
		private Volume _volumeComponent;
#if UNITY_6000_0_OR_NEWER
		private ProbeVolumesOptions _probeVolumesOptionsOverrideComponent;
#endif
		
		private readonly HashSet<IService> _services = new HashSet<IService>();

		public GeneralSettings                    GeneralSettings                    = new GeneralSettings();
		public VoxelizationSettings               VoxelizationSettings               = new VoxelizationSettings();
		public LightingSettings                   LightingSettings                   = new LightingSettings();
		public ScreenSpaceLightingSettings        ScreenSpaceLightingSettings        = new ScreenSpaceLightingSettings();
		public ReflectionIndirectLightingSettings ReflectionIndirectLightingSettings = new ReflectionIndirectLightingSettings();

		[SerializeField]
		private DebugSettings DebugSettings = new DebugSettings();

		[SerializeField] private bool _globalSettingsTab      = true;
		[SerializeField] private bool _screenSpaceLightingTab = true;
		[SerializeField] private bool _wsgiTab                = true;
		[SerializeField] private bool _lightingTab            = true;
		[SerializeField] private bool _reflectionsTab         = true;
		[SerializeField] private bool _debugTab               = true;

		[SerializeField] private bool _showVoxelParams   = true;
		[SerializeField] private bool _showUpdateOptions = true;

		private Light _prevDirLight;
		private TracingMode _prevTracingMode;

		internal bool NeedToReallocForUI
		{
			get
			{
				return VoxelsService.Instance.NeedToReallocForUI;
			}
		}

		/// <summary>
		/// Reset Irradiance Cache
		/// </summary>
		public void ResetIrradianceCache()
		{
			SoftwareTracingShared.ClearRadianceCache = true;
		}

		/// <summary>
		/// Forced scene voxelization
		/// </summary>
		public void VoxelizeNow()
		{
			VoxelizationRuntimeData.FullVoxelization = true;
		}

		/// <summary>
		/// Apply Parameters, use only after changes setting's values in Parameters section. Do not recommend use it every frame.
		/// </summary>
		public void ApplyParameters()
		{
			VoxelizationRuntimeData.OnReallocTextures?.Invoke();
		}

		private void OnEnable()
		{
			HSettings.GeneralSettings                    = GeneralSettings;
			HSettings.VoxelizationSettings               = VoxelizationSettings;
			HSettings.LightingSettings                   = LightingSettings;
			HSettings.ScreenSpaceLightingSettings        = ScreenSpaceLightingSettings;
			HSettings.ReflectionIndirectLightingSettings = ReflectionIndirectLightingSettings;
			HSettings.DebugSettings                      = DebugSettings;
			SoftwareTracingPassURP.RequestHashBufferRecreate();
			
			VoxelizationRuntimeData.OnReallocTextures       += () =>
			{
				HSettings.VoxelizationSettings.UpdateData();
				SoftwareTracingPassURP.AllocationHashBuffers(forceRecreate: true);
				
				VoxelizationRuntimeData.FullVoxelization = true;
				VoxelizationRuntimeData.TextureSwapCounter = 0;
				VoxelizationRuntimeData.TextureOutputCounter = 0;
				
				VoxelizationRuntimeData.SetParamsForApplyButton(HSettings.VoxelizationSettings.VoxelDensity, HSettings.VoxelizationSettings.VoxelBounds, HSettings.VoxelizationSettings.OverrideBoundsHeight);
			};
			//HSettings.GeneralSettings.OnRayCountChanged += (RayCountMode mode) => { SoftwareTracingResources.Allocation();};

#if UNITY_EDITOR
			HPipelinesConfigurator.AlwaysIncludedShaders();
#endif
			VoxelizationRuntimeData.Initialize(); // must be before RegisterService, because needed to reset OctantIndex  
			VolumeSetup();
			RegisterServices();
			Register();
		}

		private void OnValidate()
		{
			Register();
		}

		private void Reset()
		{
			Register();
		}

		private void LateUpdate()
		{
			foreach (var service in _services)
			{
				service.LateUpdate();
			}

			VolumeSetup();
		}

		private void RegisterServices()
		{
			VoxelsService.Instance.Initialize(0);
			_services.Add(VoxelsService.Instance);
			DirectionalShadowmapService.Instance.Initialize(0);
			_services.Add(DirectionalShadowmapService.Instance);
			LightService.Instance.Initialize();
			_services.Add(LightService.Instance);
		}

		private void Register()
		{
			HTraceWSGIRendererFeature.RegisterSettings(this);
		}

		private void OnDisable()
		{
			if (_volumeComponent != null)
				_volumeComponent.enabled = false;
#if UNITY_6000_0_OR_NEWER
			if (_probeVolumesOptionsOverrideComponent != null)
				_probeVolumesOptionsOverrideComponent.active = false;
#endif
			
			foreach (var service in _services)
			{
				service.Cleanup();
			}
			_services.Clear();
			HTraceWSGIRendererFeature.UnregisterSettings(this);
			
			VoxelizationRuntimeData.OnReallocTextures = null;
		}
		
		private void VolumeSetup()
		{
#if UNITY_6000_0_OR_NEWER
			CreateSSGIOverrideComponent();
			SetSSGIOverrideComponentSettings();
			ChangeObjectWithSerialization_ONLYEDITOR();
#endif
		}

#if UNITY_6000_0_OR_NEWER
		private void CreateSSGIOverrideComponent()
		{
			_volumeComponent = gameObject.GetComponent<Volume>();
			if (_volumeComponent == null)
			{
				_volumeComponent = gameObject.AddComponent<Volume>();
				_volumeComponent.enabled = false;
			}

			if (_volumeComponent.sharedProfile == null || _volumeComponent.sharedProfile.name.Contains("HTrace") == false)
			{
				//We can't crate it in runtime, because after build it will break.
				//it will call only in editor, but if someone changes it in runtime, we will override.
				_volumeComponent.sharedProfile = Resources.Load<VolumeProfile>($"{HNames.ASSET_NAME}/Volume Profile HTrace WSGI URP");
			}

			_volumeComponent.sharedProfile.TryGet(out _probeVolumesOptionsOverrideComponent);
		}

		private void SetSSGIOverrideComponentSettings()
		{
			_volumeComponent.hideFlags = HSettings.DebugSettings.ShowBowels ? HideFlags.None : HideFlags.HideInInspector | HideFlags.DontSave;
			
			bool isEnable = HSettings.GeneralSettings != null && HSettings.GeneralSettings.AmbientOverride;
			_volumeComponent.enabled = isEnable;
#if UNITY_6000_0_OR_NEWER
			_probeVolumesOptionsOverrideComponent.active = isEnable;
#endif
			_volumeComponent.weight   = 1;
			_volumeComponent.priority = 100;
#if UNITY_EDITOR
			_volumeComponent.runInEditMode = true;
#endif
			if (_probeVolumesOptionsOverrideComponent != null)
			{
				_probeVolumesOptionsOverrideComponent.normalBias.overrideState    = true;
				_probeVolumesOptionsOverrideComponent.viewBias.overrideState      = true;
				_probeVolumesOptionsOverrideComponent.samplingNoise.overrideState = true;
			}
		}

		private void ChangeObjectWithSerialization_ONLYEDITOR()
		{
#if UNITY_EDITOR
			if (_probeVolumesOptionsOverrideComponent == null)
				return;

			SerializedObject probeVolumesOptionsObject = new SerializedObject(_probeVolumesOptionsOverrideComponent);

			var normalBias = probeVolumesOptionsObject.FindProperty("normalBias");
			var m_OverrideState_normalBias = normalBias.FindPropertyRelative("m_OverrideState");
			var m_Value_normalBias = normalBias.FindPropertyRelative("m_Value");
			m_OverrideState_normalBias.boolValue = true;
			m_Value_normalBias.floatValue = 0.0f;

			var viewBias = probeVolumesOptionsObject.FindProperty("viewBias");
			var m_OverrideState_viewBias = viewBias.FindPropertyRelative("m_OverrideState");
			var m_Value_viewBias = viewBias.FindPropertyRelative("m_Value");
			m_OverrideState_viewBias.boolValue = true;
			m_Value_viewBias.floatValue = 0.0f;

			var samplingNoise = probeVolumesOptionsObject.FindProperty("samplingNoise");
			var m_OverrideState_samplingNoise = samplingNoise.FindPropertyRelative("m_OverrideState");
			var m_Value_samplingNoise = samplingNoise.FindPropertyRelative("m_Value");
			m_OverrideState_samplingNoise.boolValue = true;
			m_Value_samplingNoise.floatValue = 0.0f;

			probeVolumesOptionsObject.ApplyModifiedProperties();
#endif
		}
#endif
	}
}