using UnityEngine;
using RPGCreationKit;
using RPGCreationKit.SaveSystem;

namespace RPGCreationKit
{
	[ExecuteAlways]
	public class SunLightManager : MonoBehaviour
	{
		public static SunLightManager instance;
		private bool Loaded = false;
		private float TimeTrigger = 0f;

		[Header("\tReferences")]
		[Tooltip("The Sun.")]
		[SerializeField] private Light DirectionalLight;
		[Tooltip("The preset to use.")]
		[SerializeField] public SunLightPreset Preset;
		[Tooltip("The Stars.")]
		[SerializeField] private Transform StarsSky;
		[Tooltip("The player.")]
		[SerializeField] private Transform Player;
		[Tooltip("The settings to use in an Interior cell.")]
		[SerializeField] private LightingSettings InteriorLS;
		[Tooltip("The settings to use in an Exterior cell.")]
		[SerializeField] private LightingSettings ExteriorLS;

		[Header("\tEnable / Disable")]
		[SerializeField] private bool EnableDirectionalColor = true;
		[SerializeField] private bool EnableFog = true;
		[SerializeField] private bool EnableSunIntensity = true;
		[SerializeField] private bool EnableAmbientLight = true;
		[SerializeField] private bool EnableStars = true;

		[Header("\tCurrent Time")]
		[Tooltip("How many frames need to pass before this script runs again. (Just to save resources)")]
		[SerializeField] private int SlowDown = 2;
		[SerializeField] public int Year = 0;
		[SerializeField] public int Month = 1;
		[SerializeField] public int Day = 1;
		[SerializeField, Range(0, 24)] public float TimeOfDay;

		[Header("\tTime Settings")]
		[Tooltip("How many days are in a month.")]
		[SerializeField] private int MonthLength = 28;
		[Tooltip("How many months are in a year.")]
		[SerializeField] private int YearLength = 13;

		private Material StarsMat;
		public bool IsInterior = false;
		private int SlowDownCount = 1;

		void Start() {
			StarsMat = null;
			StarsMat = StarsSky.GetComponent<ParticleSystem>().GetComponent<Renderer>().sharedMaterial;
			
			Year = SaveSystemManager.instance.saveFile.Environment.Year;
			Month = SaveSystemManager.instance.saveFile.Environment.Month;
			Day = SaveSystemManager.instance.saveFile.Environment.Day;
			TimeOfDay = SaveSystemManager.instance.saveFile.Environment.TimeOfDay;

			Loaded = true;
		}

		// Update is called once per frame
		void Update() {
			if (SlowDownCount < SlowDown) { // this is just to slow down. makes this run every other frame, using only half as much power.
				SlowDownCount += 1;
			} else {
				SlowDownCount = 0;
				
				if (TimeTrigger > TimeOfDay) { // Should only trigger once a day.
					Day += 1;
				}
				
				TimeTrigger = TimeOfDay;

				if (Day > MonthLength) {
					Day = 1;
					Month += 1;
				}

				if (Month > YearLength) {
					Month = 1;
					Year += 1;
				}

				if (Loaded == false) {
					return;
				}

				if (Preset == null) {
					return;
				}

				if (Application.isPlaying) {
					TimeOfDay += (Time.deltaTime / 180f);
					TimeOfDay %= 24;
					float TimePercent = TimeOfDay / 24f;

					//Color WorldBrightness = Preset.WorldBrightness.Evaluate(TimePercent);

					if (IsInterior == false) {

						// Setting the Sun
						if (DirectionalLight.gameObject.activeSelf == true) {
							if (RenderSettings.sun != DirectionalLight) {
								RenderSettings.sun = DirectionalLight;
											
							}
						}
						
						// Setting the Sun
						if (EnableDirectionalColor) {
							Color DirectionalTempColor = Preset.DirectionalColor.Evaluate(TimePercent);
							DirectionalLight.color = DirectionalTempColor;
							RenderSettings.skybox.SetFloat("_Exposure", (DirectionalTempColor.a * 5));
						}

						// Setting the Ambiance Lighting
						//InteriorLS.indirectScale = WorldBrightness.a * 1.5f;
					} else {
						//ExteriorLS.indirectScale = WorldBrightness.a * 1.5f;
					}
					UpdateLighting(TimePercent);
				}
			}
		}
		
		private void UpdateLighting(float TimePercent) {
			if (EnableAmbientLight) {
				RenderSettings.ambientLight = Preset.AmbientColor.Evaluate(TimePercent);
			}

			// Fog
			if (EnableFog) {
				Color FogTempColor = Preset.FogColor.Evaluate(TimePercent);
				RenderSettings.fogColor = FogTempColor;
				RenderSettings.fogDensity = ((FogTempColor.a / 10) * 2);
			}

			// Setting the stars
			if (EnableStars) {
				StarsSky.position = Player.position;
				Color StarsColor = Preset.StarsVisability.Evaluate(TimePercent);
				Color color = StarsMat.color;
				color.a = StarsColor.a;
				StarsMat.color = color;
			}

			// Sun Intensity (Item reflections power)
			if (EnableSunIntensity) {
				Color SunTempInt = Preset.SunIntensity.Evaluate(TimePercent);
				DirectionalLight.intensity = ((SunTempInt.a) * 1.5f);
			}
			
			if (DirectionalLight != null) {
				DirectionalLight.transform.localRotation = Quaternion.Euler(new Vector3((TimePercent * 360f) -90f, 170f, 0f));
				StarsSky.localRotation = Quaternion.Euler(new Vector3((TimePercent * 360f) -90f, -100, 40));
			}
		}

		public string GetMonth(int A) { // Ari, Tau, Gen, Can, Le, Ver, Lib, Sco, Sol, Sag, Cap, Aua, Pis.
			if (A == 0) {
				return "Aries";
			} else if (A == 1) {
				return "Taurus";
			} else if (A == 2) {
				return "Gemini";
			} else if (A == 3) {
				return "Cancer";
			} else if (A == 4) {
				return "Leo";
			} else if (A == 5) {
				return "Virgo";
			} else if (A == 6) {
				return "Libra";
			} else if (A == 7) {
				return "Scorpio";
			} else if (A == 8) {
				return "Sol";
			} else if (A == 9) {
				return "Sagittarius";
			} else if (A == 10) {
				return "Capricorn";
			} else if (A == 11) {
				return "Aquarius";
			} else {
				return "Pisces";
			}
		}
	}
}