using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using UnityEditor;
using UnityEngine;

public static class Tool
{
    [MenuItem("KopTools/MakeTexture")]
    public static void MakeTextureArray()
    {
        MakeTexture();
    }

    private static void MakeTexture()
    {
        TextAsset textAsset = Resources.Load<TextAsset>("TerrainInfo");
        string[] terrainInfos = textAsset.text.Split("\n");

        Texture2D texture2D = new Texture2D(2048, 2048);
        for (int i = 0; i < 2048; i++)
        {
            for (int j = 0; j < 2048; j++)
            {
                texture2D.SetPixel(i, j, Color.black);
            }
        }

        for (int i = 0; i < terrainInfos.Length; i++)
        {
            string infoItem = terrainInfos[i];
            if (string.IsNullOrEmpty(infoItem))
                continue;

            string[] infos = infoItem.Split("\t", StringSplitOptions.RemoveEmptyEntries);
            if (infos is { Length: < 2 })
                continue;

            string texName = Path.GetFileNameWithoutExtension(infos[1]);
            string texFilePath = $"Textures/{texName}";

            int startX = i * 256 % 2048;
            int startY = (63 - i) / 8 * 256;

            Texture2D texture = Resources.Load<Texture2D>(texFilePath);
            if (texture)
            {
                var pixels = texture.GetPixels();
                texture2D.SetPixels(startX, startY, texture.width, texture.height, pixels);
            }

            Debug.Log($"i:{i} | startX:{startX} | startY:{startY} | {texFilePath}");
        }

        // save
        File.WriteAllBytes($"Assets/TerrainTex.png", texture2D.EncodeToPNG());
    }
}