using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.Linq; // used for Sum of array

public class ProceduralTextureScript : MonoBehaviour
{
    public float snowHeight;
    public float rockSlope;

    // Start is called before the first frame update
    void Start()
    {

    }

    float transition(float start, float end, float value)
    {
        if (start > end)
        {
            return 1 - transition(end, start, value);
        }
        if (value < start)
        {
            return 0;
        }
        if (value >= end)
        {
            return 1;
        }
        var scaledValue = (value - start) / (end - start);
        return scaledValue;
    }

    public void runProcedrualTexturing()
    {
        var terrain = gameObject.GetComponent<Terrain>();
        var layers = terrain.terrainData.alphamapLayers;
        var height = terrain.terrainData.alphamapWidth;
        var width = terrain.terrainData.alphamapHeight;


        Debug.Log(layers);
        Debug.Log(height);
        Debug.Log(width);

        Debug.Log(terrain.terrainData.GetInterpolatedHeight(0.5f, 0.5f));

        var newSplatMap = new float[width, height, layers];
        //for (int i=0; i<)

        for (int i = 0; i < width; i++)
        {
            for (int j = 0; j < width; j++)
            {
                float x = j / (float)height;
                float y = i / (float)width;
                var splatWeights = new float[layers];
                var terrainSteepness = terrain.terrainData.GetSteepness(x, y);
                for (int k = 0; k < layers; k++)
                {
                    splatWeights[k] = terrainSteepness;
                }

                float sum = splatWeights.Sum();

                for (int k = 0; k < layers; k++)
                {
                    newSplatMap[i, j, k] = splatWeights[k] / sum;
                }
            }
        }
        terrain.terrainData.SetAlphamaps(0, 0, newSplatMap);
    }

    // Update is called once per frame
    void Update()
    {

    }
}