#if UNITY_EDITOR
using System.Collections.Generic;
using System.IO;
using UnityEditor;
using UnityEditor.AddressableAssets;
using UnityEditor.AddressableAssets.Settings;
using UnityEngine;

namespace BrewMonster
{
	/// <summary>
	/// Assign a parent folder, then register all assets under it into an Addressables group named after that folder.
	/// Addresses are relative to the parent folder, without the file extension (e.g. .png, .wav). Text files are skipped.
	/// </summary>
	public class FolderToAddressablesWindow : EditorWindow
	{
		private const string MenuPath = "Tools/Addressable/Folder To Addressables…";

		private static readonly HashSet<string> TextExtensions = new HashSet<string>(System.StringComparer.OrdinalIgnoreCase)
		{
			".txt", ".md", ".csv", ".json", ".xml", ".yaml", ".yml", ".log", ".ini", ".cfg", ".html", ".htm",
		};

		private DefaultAsset _parentFolder;
		private Vector2 _scroll;
		private string _log = "";

		[MenuItem(MenuPath)]
		public static void Open()
		{
			var w = GetWindow<FolderToAddressablesWindow>(false, "Folder To Addressables", true);
			w.minSize = new Vector2(420, 280);
			w.Show();
		}

		private void OnGUI()
		{
			EditorGUILayout.Space(4);
			EditorGUILayout.LabelField("Folder To Addressables", EditorStyles.boldLabel);

			EditorGUILayout.HelpBox(
				"Group name = last segment of the folder path. Two different paths with the same folder name share one group. " +
				"Address keys omit file extensions (e.g. Sub/Sprite not Sub/Sprite.png). " +
				"If nothing updates, ensure the target group is not Read Only in the Addressables Groups window.",
				MessageType.Info);

			EditorGUILayout.Space(4);

			var newFolder = (DefaultAsset)EditorGUILayout.ObjectField(
				"Parent folder", _parentFolder, typeof(DefaultAsset), false);

			if (newFolder != _parentFolder)
			{
				_parentFolder = newFolder;
				_log = "";
			}

			string parentPath = _parentFolder != null ? AssetDatabase.GetAssetPath(_parentFolder) : null;
			bool validFolder = !string.IsNullOrEmpty(parentPath) && AssetDatabase.IsValidFolder(parentPath);
			if (_parentFolder != null && !validFolder)
			{
				EditorGUILayout.HelpBox("Assign a folder from the Project window (not a file).", MessageType.Warning);
			}

			string groupName = validFolder ? Path.GetFileName(parentPath.TrimEnd('/')) : "";
			EditorGUILayout.LabelField("Addressables group", string.IsNullOrEmpty(groupName) ? "—" : groupName);

			EditorGUILayout.Space(8);

			EditorGUI.BeginDisabledGroup(!validFolder);
			if (GUILayout.Button("Start", GUILayout.Height(28)))
			{
				Run(parentPath, groupName);
			}
			EditorGUI.EndDisabledGroup();

			EditorGUILayout.Space(6);
			EditorGUILayout.LabelField("Log", EditorStyles.boldLabel);
			_scroll = EditorGUILayout.BeginScrollView(_scroll, GUILayout.ExpandHeight(true));
			EditorGUILayout.TextArea(string.IsNullOrEmpty(_log) ? "(empty)" : _log, EditorStyles.textArea, GUILayout.ExpandHeight(true));
			EditorGUILayout.EndScrollView();
		}

		private void Run(string parentPath, string groupName)
		{
			_log = "";

			var settings = AddressableAssetSettingsDefaultObject.Settings;
			if (settings == null)
			{
				AppendLog("ERROR: Addressable settings not found. Install/configure the Addressables package.");
				EditorUtility.DisplayDialog("Folder To Addressables", "Addressable settings not found.", "OK");
				return;
			}

			if (string.IsNullOrEmpty(groupName))
			{
				AppendLog("ERROR: Could not derive group name from folder path.");
				return;
			}

			var group = GetOrCreateGroup(settings, groupName);
			if (group == null)
			{
				AppendLog($"ERROR: Could not find or create group: {groupName}");
				EditorUtility.DisplayDialog("Folder To Addressables", $"Could not find or create group: {groupName}", "OK");
				return;
			}

			if (group.ReadOnly)
			{
				AppendLog(
					"ERROR: The target Addressables group is Read Only. Unity will not apply CreateOrMoveEntry/SetAddress. " +
					"Open Window > Asset Management > Addressables > Groups, select the group, and disable Read Only in the Inspector.");
				EditorUtility.DisplayDialog(
					"Folder To Addressables",
					$"Group \"{groupName}\" is Read Only. Disable Read Only on that group, then run this tool again.",
					"OK");
				return;
			}

			parentPath = parentPath.Replace('\\', '/').TrimEnd('/');
			string parentPrefix = parentPath + "/";

			// Merge GUIDs from the project tree with entries already in this group under the folder.
			// Ensures we refresh addresses for assets that are already addressable (not ignored when the group already existed).
			var guidsToProcess = new HashSet<string>(System.StringComparer.OrdinalIgnoreCase);
			foreach (var g in AssetDatabase.FindAssets("", new[] { parentPath }))
				guidsToProcess.Add(g);

			if (group.entries != null)
			{
				foreach (var existing in group.entries)
				{
					if (existing == null)
						continue;
					string ap = existing.AssetPath;
					if (string.IsNullOrEmpty(ap))
						continue;
					ap = ap.Replace('\\', '/');
					if (AssetDatabase.IsValidFolder(ap))
						continue;
					if (!ap.StartsWith(parentPrefix, System.StringComparison.OrdinalIgnoreCase))
						continue;
					guidsToProcess.Add(existing.guid);
				}
			}

			int processed = 0;
			int skippedText = 0;
			int skippedOther = 0;
			int errors = 0;

			foreach (string guid in guidsToProcess)
			{
				string assetPath = AssetDatabase.GUIDToAssetPath(guid);
				if (string.IsNullOrEmpty(assetPath))
				{
					skippedOther++;
					continue;
				}

				assetPath = assetPath.Replace('\\', '/');
				if (AssetDatabase.IsValidFolder(assetPath))
				{
					skippedOther++;
					continue;
				}

				// Require path under parent folder (avoid matching sibling folders e.g. .../A vs .../AB).
				if (!assetPath.StartsWith(parentPrefix, System.StringComparison.OrdinalIgnoreCase))
				{
					skippedOther++;
					continue;
				}

				if (ShouldSkipAsText(assetPath))
				{
					skippedText++;
					continue;
				}

				string relative = GetRelativeAddress(parentPath, assetPath);
				if (string.IsNullOrEmpty(relative))
				{
					skippedOther++;
					continue;
				}

				try
				{
					var existingEntry = settings.FindAssetEntry(guid);
					if (existingEntry != null && existingEntry.parentGroup != null && existingEntry.parentGroup.ReadOnly)
					{
						AppendLog($"ERROR: Cannot move or edit (source group is Read Only): {assetPath}");
						errors++;
						continue;
					}

					var entry = settings.CreateOrMoveEntry(guid, group, false, false);
					if (entry == null)
					{
						AppendLog($"ERROR: CreateOrMoveEntry failed: {assetPath}");
						errors++;
						continue;
					}

					string newAddress = ToAddressWithoutExtension(relative);
					entry.SetAddress(newAddress, false);
					processed++;
				}
				catch (System.Exception ex)
				{
					AppendLog($"ERROR: {assetPath} — {ex.Message}");
					errors++;
				}
			}

			if (processed > 0)
			{
				settings.SetDirty(AddressableAssetSettings.ModificationEvent.EntryModified, null, true);
				EditorUtility.SetDirty(settings);
				AssetDatabase.SaveAssets();
			}

			AppendLog("");
			AppendLog($"Done. Processed: {processed}, skipped (text): {skippedText}, skipped (other): {skippedOther}, errors: {errors}");

			EditorUtility.DisplayDialog(
				"Folder To Addressables",
				$"Processed: {processed}\nSkipped (text): {skippedText}\nSkipped (other): {skippedOther}\nErrors: {errors}\nGroup: {groupName}",
				"OK");
		}

		private static bool ShouldSkipAsText(string assetPath)
		{
			var mainType = AssetDatabase.GetMainAssetTypeAtPath(assetPath);
			if (mainType == typeof(TextAsset))
				return true;

			string ext = Path.GetExtension(assetPath);
			return !string.IsNullOrEmpty(ext) && TextExtensions.Contains(ext);
		}

		private static string GetRelativeAddress(string parentPath, string assetPath)
		{
			assetPath = assetPath.Replace('\\', '/');
			parentPath = parentPath.Replace('\\', '/').TrimEnd('/');

			if (string.Equals(assetPath, parentPath, System.StringComparison.OrdinalIgnoreCase))
				return null;

			string prefix = parentPath + "/";
			if (!assetPath.StartsWith(prefix, System.StringComparison.OrdinalIgnoreCase))
				return null;

			return assetPath.Substring(prefix.Length);
		}

		/// <summary>
		/// Address key: relative path with the final file extension removed (.png, .wav, .prefab, etc.).
		/// </summary>
		private static string ToAddressWithoutExtension(string relativePath)
		{
			if (string.IsNullOrEmpty(relativePath))
				return relativePath;

			relativePath = relativePath.Replace('\\', '/');
			int lastSlash = relativePath.LastIndexOf('/');
			string filePart = lastSlash >= 0 ? relativePath.Substring(lastSlash + 1) : relativePath;
			string dirPart = lastSlash >= 0 ? relativePath.Substring(0, lastSlash) : "";
			string fileNoExt = Path.GetFileNameWithoutExtension(filePart);
			if (string.IsNullOrEmpty(fileNoExt))
				fileNoExt = filePart;

			if (string.IsNullOrEmpty(dirPart))
				return fileNoExt;
			return dirPart + "/" + fileNoExt;
		}

		private static AddressableAssetGroup GetOrCreateGroup(AddressableAssetSettings settings, string groupName)
		{
			if (settings == null || string.IsNullOrEmpty(groupName))
				return null;

			AddressableAssetGroup group = settings.FindGroup(groupName);
			if (group != null)
				return group;

			try
			{
				group = settings.CreateGroup(groupName, false, false, true, null);
				if (group != null)
				{
					EditorUtility.SetDirty(settings);
					AssetDatabase.SaveAssets();
				}
				return group;
			}
			catch
			{
				return null;
			}
		}

		private void AppendLog(string line)
		{
			if (string.IsNullOrEmpty(_log))
				_log = line;
			else
				_log += "\n" + line;
			Debug.Log($"[Folder To Addressables] {line}");
			Repaint();
		}
	}
}
#endif