using UnityEngine;

namespace ProjectM.Client
{
    /// <summary>
    /// Live-tunable knobs for <see cref="WorldAtmosphereSystem"/> — the per-region fog/ambient cross-fade
    /// between the lush cyan-ordered meadow base (origin) and the hostile orange-wild arid expedition (+1000 X).
    /// Mirrors the <c>WorldFeelConfig</c>/<c>VFXConfig</c> bridge idiom: a MonoBehaviour placed in the gameplay
    /// scene with a static <see cref="Instance"/> the client presentation system reads (falling back to these
    /// same defaults when absent). Pure presentation — never touches the simulation. Colours are sRGB.
    /// </summary>
    public sealed class WorldAtmosphereConfig : MonoBehaviour
    {
        public static WorldAtmosphereConfig Instance;

        [Header("Region boundary (camera world-space X)")]
        [Tooltip("Camera X past this reads as the +1000 expedition region (matches HudSystem's ExpeditionRegionXMin).")]
        public float BoundaryX = 500f;
        [Tooltip("Half-width of the smooth transition band around BoundaryX, in world units.")]
        public float BlendHalfWidth = 80f;

        [Header("Base (meadow) atmosphere")]
        public Color BaseFogColor = new Color(0.784f, 0.878f, 0.824f, 1f);     // #C8E0D2
        public float BaseFogDensity = 0.006f;
        public Color BaseAmbientSky = new Color(0.725f, 0.831f, 0.949f, 1f);    // #B9D4F2

        [Header("Expedition (arid desert) atmosphere")]
        public Color ExpeditionFogColor = new Color(0.851f, 0.549f, 0.227f, 1f);   // #D98C3A
        public float ExpeditionFogDensity = 0.010f;
        public Color ExpeditionAmbientSky = new Color(0.910f, 0.769f, 0.604f, 1f); // #E8C49A

        void OnEnable() { Instance = this; }
        void OnDisable() { if (Instance == this) Instance = null; }

        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.SubsystemRegistration)]
        static void ResetStatics() { Instance = null; }
    }
}