using UnityEngine;

namespace Ashwild.Environment
{
    // Pilote la saison globale de tous les shaders qui lisent "_Season" (ex: StylizedGrass).
    // ExecuteAlways : la transition est visible directement dans l'éditeur, sans lancer le jeu.
    [ExecuteAlways]
    [AddComponentMenu("GAME/Environment/Season Manager")]
    public class SeasonManager : MonoBehaviour
    {
        public static SeasonManager Instance { get; private set; }

        public enum Season { Summer = 0, Autumn = 1, Winter = 2 }

        [Header("Saison")]
        [Tooltip("0 = Été (vert), 1 = Automne, 2 = Hiver, 3 = reboucle à l'été.")]
        [Range(0f, 3f)] [SerializeField] private float season = 0f;

        [Header("Cycle automatique")]
        [SerializeField] private bool autoCycle = false;
        [Tooltip("Durée d'une année complète (les 4 saisons) en secondes. N'avance qu'en Play.")]
        [SerializeField] private float yearDuration = 120f;

        private static readonly int SeasonId = Shader.PropertyToID("_Season");

        public float SeasonValue => season;

        void OnEnable()
        {
            Instance = this;
            Apply();
        }

        void OnValidate()
        {
            yearDuration = Mathf.Max(0.01f, yearDuration);
            Apply();
        }

        void Update()
        {
            if (autoCycle && Application.isPlaying)
            {
                season += (3f / yearDuration) * Time.deltaTime;
                if (season >= 3f) season -= 3f;
            }
            Apply();
        }

        void Apply()
        {
            Shader.SetGlobalFloat(SeasonId, season);

    #if UNITY_EDITOR
            // Rafraîchit la Scene view quand on scrute le slider hors Play.
            if (!Application.isPlaying)
                UnityEditor.SceneView.RepaintAll();
    #endif
        }

        // --- API publique (gameplay / calendrier) -------------------------------------

        public void SetSeason(float value)
        {
            season = Mathf.Repeat(value, 3f);
            Apply();
        }

        public void SetSeason(Season s)
        {
            season = (float)s;
            Apply();
        }
    }
}