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

public class UnusedAssetFinder
{
    [MenuItem("Tools/Find Unused Assets")]
    static void FindUnusedAssets()
    {
        string[] allAssetPaths = AssetDatabase.GetAllAssetPaths()
            .Where(path => path.StartsWith("Assets/") && !AssetDatabase.IsValidFolder(path))
            .ToArray();

        HashSet<string> usedAssets = new HashSet<string>();

        string[] scenes = EditorBuildSettings.scenes
            .Where(s => s.enabled)
            .Select(s => s.path)
            .ToArray();

        string[] prefabPaths = AssetDatabase.FindAssets("t:Prefab")
            .Select(AssetDatabase.GUIDToAssetPath)
            .ToArray();

        string[] dependencies = AssetDatabase.GetDependencies(scenes.Concat(prefabPaths).ToArray(), true);
        foreach (string dep in dependencies)
        {
            usedAssets.Add(dep);
        }

        List<string> unusedAssets = allAssetPaths
            .Where(path => !usedAssets.Contains(path))
            .ToList();

        List<string> reportLines = new List<string>();
        long totalSize = 0;

        reportLines.Add("Assets non utilisés (avec taille en Ko) :\n");

        foreach (string assetPath in unusedAssets)
        {
            string fullPath = Path.Combine(Directory.GetCurrentDirectory(), assetPath);
            if (File.Exists(fullPath))
            {
                long sizeBytes = new FileInfo(fullPath).Length;
                long sizeKB = sizeBytes / 1024;
                totalSize += sizeBytes;

                reportLines.Add($"{assetPath} - {sizeKB} Ko");
            }
            else
            {
                reportLines.Add($"{assetPath} - fichier introuvable");
            }
        }

        reportLines.Add($"\nTaille totale des fichiers non utilisés : {totalSize / 1024} Ko ({totalSize / (1024 * 1024f):F2} Mo)");

        string outputPath = Path.Combine(Directory.GetCurrentDirectory(), "UnusedAssets.txt");
        File.WriteAllLines(outputPath, reportLines);

        Debug.Log($"✔️ Analyse terminée : {unusedAssets.Count} fichiers non utilisés détectés.\n📄 Rapport généré dans : {outputPath}");
    }
}