using System.IO;
using UnityEditor;
using UnityEngine;

namespace Misaki.ArtToolEditor
{
    internal class CreateTerrainLayerProcessor : IAssetsProcessor
    {
        private const string Terrain_Layer_Extension = ".terrainlayer";

        public void OnPreProcess(AssetsProcessContext context)
        {
        }

        public void OnProcess(UnityEngine.Object source, string outputDirectory, AssetsProcessContext context)
        {
            if (source is not Material mat)
            {
                return;
            }

            var terrainLayer = new TerrainLayer()
            {
                diffuseTexture = mat.GetTexture("_BaseColorMap") as Texture2D,
                normalMapTexture = mat.GetTexture("_NormalMap") as Texture2D,
                maskMapTexture = mat.GetTexture("_MaskMap") as Texture2D,
            };

            var outputPath = Path.Combine(outputDirectory, mat.name + Terrain_Layer_Extension);
            AssetDatabase.CreateAsset(terrainLayer, outputPath);
        }

        public void OnPostProcess(AssetsProcessContext context)
        {
        }
    }
}