using UnityEngine;
using UnityEditor;
using System.IO;

public class ResizeTexturesTool : EditorWindow
{
    private string folderPath = "Assets/"; // Default folder path
    private int width = 512; // Default width
    private int height = 512; // Default height

    [MenuItem("Window/Damarjian/Resize Textures Tool")]
    public static void ShowWindow()
    {
        GetWindow(typeof(ResizeTexturesTool)); // Create or focus the editor window
    }

    private void OnGUI()
    {
        GUILayout.Label("Select Folder and Resize Textures", EditorStyles.boldLabel); // Label

        EditorGUILayout.BeginHorizontal();
        folderPath = EditorGUILayout.TextField("Folder Path", folderPath); // Folder path input field
        if (GUILayout.Button("Browse")) // Browse button
        {
            folderPath = EditorUtility.OpenFolderPanel("Select Folder", folderPath, ""); // Open folder dialog
        }
        EditorGUILayout.EndHorizontal();

        width = EditorGUILayout.IntField("Width", width); // Width input field
        height = EditorGUILayout.IntField("Height", height); // Height input field

        if (GUILayout.Button("Resize Textures")) // Resize button
        {
            ResizeAllTexturesInFolder(); // Call resize method
        }
    }

    private void ResizeAllTexturesInFolder()
    {
        string[] fileEntries = Directory.GetFiles(folderPath); // Get files in the folder
        foreach (string fileName in fileEntries)
        {
            string assetPath = fileName.Replace(Application.dataPath, "Assets"); // Convert path
            Texture2D texture = AssetDatabase.LoadAssetAtPath<Texture2D>(assetPath); // Load texture

            if (texture != null && !AssetDatabase.IsSubAsset(texture)) // Check if texture is valid
            {
                string path = AssetDatabase.GetAssetPath(texture); // Get asset path

                Texture2D resizedTexture = Resize(texture, width, height); // Resize texture

                byte[] bytes = resizedTexture.EncodeToPNG(); // Encode to PNG
                File.WriteAllBytes(path, bytes); // Write to file

                Debug.Log("Resized: " + assetPath); // Log message

                AssetDatabase.ImportAsset(path); // Re-import asset
            }
        }

        AssetDatabase.Refresh(); // Refresh the asset database
    }

private Texture2D Resize(Texture2D texture, int newWidth, int newHeight)
{
    Texture2D result = new Texture2D(newWidth, newHeight, TextureFormat.RGBA32, false); // Explicitly set format to RGBA32

    // Ensure the original texture is readable
    string path = AssetDatabase.GetAssetPath(texture);
    TextureImporter ti = (TextureImporter)TextureImporter.GetAtPath(path);
    ti.isReadable = true;
    ti.SaveAndReimport();

    // Create a temporary render texture
    RenderTexture rt = RenderTexture.GetTemporary(newWidth, newHeight);
    rt.filterMode = FilterMode.Bilinear;

    // Set the current active render texture
    RenderTexture.active = rt;

    // Blit the original texture to the render texture
    Graphics.Blit(texture, rt);

    // Read the pixels from the render texture into the result texture
    result.ReadPixels(new Rect(0, 0, newWidth, newHeight), 0, 0);
    result.Apply();

    // Reset the active render texture
    RenderTexture.active = null;

    // Release the temporary render texture
    RenderTexture.ReleaseTemporary(rt);

    // Return the resized texture
    return result;
}
}