using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;
using OHM.UnityToolkit;
using UnityEngine.Serialization;

namespace Ambiance
{
	public class AmbianceController : UniqueInstance<AmbianceController>
	{
		[SerializeField]
		public AmbiancesDef ambiancesDef;

		[SerializeField]
		[FormerlySerializedAs("skyMatRef")]
		private Material _skyMatRef;

		[SerializeField]
		[FormerlySerializedAs("dirLight")]
		private Light _dirLight;

		private Camera camera;

		public Dictionary<string, Color> debugColors = new Dictionary<string, Color>();

		public int changeAmbianceSectionCount = 1;

		private AmbianceDef _forcedAmbiance;

		private bool currentlyOnFire;

		public UnityEvent OnAmbianceChange;

		public AmbianceDef CurrentAmbiance { get; private set; }

		public AmbianceDef CurrentAmbianceToUse { get; private set; }

		public int CurrentLevelIdx { get; private set; }

		public int CurrentAmbianceIdx { get; private set; }

		public int CurrentAmbianceRealIdx { get; private set; }

		public Material SkyMat { get; private set; }

		public Dictionary<string, Material> SpecialMats { get; private set; }

		public bool Flip { get; set; }

		public string _debugSkyColorKey { get; private set; } = "debug_sky_color";

		public string GetFlippedId(string id)
		{
			return id + "_f";
		}

		protected override void AwakeInstance()
		{
			SpecialMats = new Dictionary<string, Material>();
			foreach (SpecialMatDef def in ambiancesDef.specialsMatRef)
			{
				var mat = new Material(def.materialRef);
				mat.name = mat.name + "_" + def.id;
				SpecialMats[def.id] = mat;
				if (!def.flippable)
				{
					continue;
				}

				var flipped = new Material(def.materialRef);
				string flippedId = GetFlippedId(def.id);
				flipped.name = flipped.name + "_" + flippedId;
				flipped.mainTextureScale = new Vector2(flipped.mainTextureScale.x, 0f - flipped.mainTextureScale.y);
				SpecialMats[flippedId] = flipped;
			}
			if (_skyMatRef != null)
			{
				SkyMat = new Material(_skyMatRef);
				RenderSettings.skybox = SkyMat;
			}
		}

		public void UpdateCameraAmbiance(Camera camera)
		{
			this.camera = camera;
			SetAmbiance(CurrentAmbiance, currentlyOnFire);
		}

		public void ForceAmbiance(AmbianceDef amb)
		{
			_forcedAmbiance = amb;
			SetLevelIdx(CurrentLevelIdx, currentlyOnFire, forceReload: true);
		}

		public void SetLevelIdx(int levelIdx, bool onFire, bool forceReload)
		{
			if (!forceReload && CurrentLevelIdx == levelIdx && currentlyOnFire == onFire)
			{
				return;
			}
			CurrentLevelIdx = levelIdx;
			currentlyOnFire = onFire;
			if (_forcedAmbiance != null)
			{
				SetAmbiance(_forcedAmbiance, onFire);
				return;
			}
			CurrentAmbianceIdx = levelIdx / changeAmbianceSectionCount;
			List<AmbianceDef> ambiances = ambiancesDef.GetAmbiancesList();
			CurrentAmbianceRealIdx = CurrentAmbianceIdx % ambiances.Count;
			SetAmbiance(ambiances[CurrentAmbianceRealIdx], onFire);
		}

		public void TryAmbiance(AmbianceDef ambianceDef, bool onFire)
		{
			SetAmbiance(ambianceDef, onFire);
		}

		public Material GetSpecialMat(string id, bool allowFlip = false)
		{
			if (SpecialMats == null)
			{
				return null;
			}
			if (Flip && allowFlip)
			{
				string flippedId = GetFlippedId(id);
				if (SpecialMats.ContainsKey(flippedId))
				{
					return SpecialMats[flippedId];
				}
			}
			if (SpecialMats.ContainsKey(id))
			{
				return SpecialMats[id];
			}
			return null;
		}

		private void SetAmbiance(AmbianceDef def, bool fire)
		{
			CurrentAmbiance = def;
			AmbianceDef toUse = (fire && def != null && def.fireAmbiance != null) ? def.fireAmbiance : def;
			CurrentAmbianceToUse = toUse;
			if (toUse == null)
			{
				return;
			}
			RenderSettings.fogColor = toUse.fogColor;
			ApplySpecialColor(toUse);
			if (SkyMat != null)
			{
				if (debugColors.ContainsKey(_debugSkyColorKey))
				{
					Color debugColor = debugColors[_debugSkyColorKey];
					SkyMat.SetColor("_SkyColor1", debugColor);
					SkyMat.SetColor("_SkyColor2", debugColor);
					SkyMat.SetColor("_SkyColor3", debugColor);
				}
				else
				{
					SkyMat.SetTexture("_MainTex", def.skyPano);
				}
			}
			FogDistance fog = (def.fogDistance != null) ? def.fogDistance : ambiancesDef.defaultFogDistance;
			RenderSettings.fogStartDistance = fog.start;
			RenderSettings.fogEndDistance = fog.end;
			OnAmbianceChange.Invoke();
		}

		private void ApplySpecialColor(AmbianceDef def)
		{
			if (def == null || def.specialColors == null)
			{
				return;
			}
			foreach (SpecialColorDef sc in def.specialColors)
			{
				Material mat = GetSpecialMat(sc.id);
				if (mat != null)
				{
					ApplySpecialColorToMat(mat, sc);
				}
				else
				{
					Debug.LogErrorFormat(
						"Ambiance {0} is trying to set undefined special material {1}. Please check ambiance or def",
						def.name, sc.id);
				}
				Material flipped = GetSpecialMat(GetFlippedId(sc.id));
				if (flipped != null)
				{
					ApplySpecialColorToMat(flipped, sc);
				}
			}
		}

		private void ApplySpecialColorToMat(Material specMat, SpecialColorDef sc)
		{
			if (debugColors.ContainsKey(sc.id))
			{
				Color debugColor = debugColors[sc.id];
				specMat.SetColor("_TintColor", debugColor);
				specMat.SetColor("_ColorAdd", debugColor);
				specMat.SetColor("_EmissionColor", debugColor);
				specMat.mainTexture = null;
				return;
			}
			specMat.color = sc.color;
			if (specMat.HasProperty("_TintColor"))
			{
				specMat.SetColor("_TintColor", sc.color);
			}
			if (specMat.HasProperty("_ColorAdd"))
			{
				specMat.SetColor("_ColorAdd", sc.colorAdd);
			}
			if (specMat.HasProperty("_EmissionColor"))
			{
				specMat.EnableKeyword("_EMISSION");
				specMat.SetColor("_EmissionColor", sc.colorEmission);
			}
			if (specMat.HasProperty("_EmissionMap") && sc.textureEmission != null)
			{
				specMat.SetTexture("_EmissionMap", sc.textureEmission);
			}
			if (sc.texture != null)
			{
				specMat.mainTexture = sc.texture;
				return;
			}

			SpecialMatDef matDef = ambiancesDef.specialsMatRef.Find((SpecialMatDef d) => d.id == sc.id);
			if (matDef != null)
			{
				specMat.mainTexture = matDef.materialRef.mainTexture;
			}
		}
	}
}