using System;
using UnityEngine;

namespace Game.WorldGen
{
    /// <summary>
    /// One height/slope texture band. Paints <see cref="layer"/> where the terrain height
    /// (in world meters) and slope fall in range, with a smooth fade at the edges so adjacent
    /// bands blend instead of hard-cutting. Rules are weighted + normalised per pixel.
    /// You can still refine everything by hand with Unity's paint tool afterwards.
    /// </summary>
    [Serializable]
    public class SplatRule
    {
        public TerrainLayer layer;

        [Tooltip("Lowest terrain height (world meters) where this layer appears.")]
        public float minHeightMeters = 0f;
        [Tooltip("Highest terrain height (world meters) where this layer appears.")]
        public float maxHeightMeters = 1000f;
        [Tooltip("Soft fade width at the height edges, in meters. 0 = hard cut. Bigger = smoother blend.")]
        public float heightFadeMeters = 10f;

        [Range(0f, 90f), Tooltip("Min slope in degrees (0 = flat).")]
        public float minSlopeDeg = 0f;
        [Range(0f, 90f), Tooltip("Max slope in degrees (90 = vertical).")]
        public float maxSlopeDeg = 90f;
        [Range(0f, 45f), Tooltip("Soft fade width at the slope edges, in degrees.")]
        public float slopeFadeDeg = 6f;

        [Range(0.01f, 4f), Tooltip("Relative strength when competing with other rules on the same pixel.")]
        public float weight = 1f;
    }
}