fixed GSA writing, added always-edit button and search in file and for file

GsaEditor/ViewModels/MainWindowViewModel.cs

@@ -1,6 +1,7 @@
 using System.Collections.ObjectModel;
 using System.Reflection;
 using System.Text;
+using System.Text.RegularExpressions;
 using Avalonia.Controls;
 using Avalonia.Media.Imaging;
 using Avalonia.Platform.Storage;
@@ -84,8 +85,24 @@ public partial class MainWindowViewModel : ViewModelBase
     [ObservableProperty]
     private bool _isEditingText;
 
+    [ObservableProperty]
+    private string? _searchQuery;
+
+    [ObservableProperty]
+    private bool _searchInContents;
+
+    [ObservableProperty]
+    private string? _searchStatus;
+
+    [ObservableProperty]
+    private SearchResultViewModel? _selectedSearchResult;
+
     public ObservableCollection<EntryTreeNodeViewModel> TreeRoots { get; } = new();
 
+    public ObservableCollection<SearchResultViewModel> SearchResults { get; } = new();
+
+    public bool HasSearchResults => SearchResults.Count > 0;
+
     // --- Derived properties ---
 
     public string Title => ArchivePath != null
@@ -255,6 +272,8 @@ public partial class MainWindowViewModel : ViewModelBase
             _archive = archive;
             ArchivePath = path;
             IsDirty = false;
+            SearchQuery = null;
+            ClearSearchResults();
             BuildTree();
             NotifyStatusChanged();
         }
@@ -347,6 +366,8 @@ public partial class MainWindowViewModel : ViewModelBase
         TreeRoots.Clear();
         SelectedEntry = null;
         SelectedNode = null;
+        SearchQuery = null;
+        ClearSearchResults();
         ClearPreview();
         NotifyStatusChanged();
     }
@@ -663,6 +684,215 @@ public partial class MainWindowViewModel : ViewModelBase
         }
     }
 
+    [RelayCommand]
+    private async Task OpenAsText()
+    {
+        if (SelectedNode?.Entry == null) return;
+
+        var data = SelectedNode.Entry.GetDecompressedData();
+
+        try
+        {
+            new UTF8Encoding(encoderShouldEmitUTF8Identifier: false, throwOnInvalidBytes: true).GetString(data);
+        }
+        catch (DecoderFallbackException)
+        {
+            if (_window != null)
+            {
+                var confirmed = await Dialogs.ConfirmAsync(_window, "Not a Text File",
+                    "This file is not valid UTF-8 text. Editing and saving it as text will corrupt its content.\n\nOpen as text anyway?");
+                if (!confirmed) return;
+            }
+        }
+
+        PreviewMode = PreviewMode.Text;
+        PreviewText = Encoding.UTF8.GetString(data);
+        PreviewImage?.Dispose();
+        PreviewImage = null;
+        HexDumpText = null;
+    }
+
+    // =========================================================================
+    // Search
+    // =========================================================================
+
+    private const int MaxNameResults = 200;
+    private const int MaxContentResults = 1000;
+
+    partial void OnSearchQueryChanged(string? value)
+    {
+        // Name search is live; content search only runs on Enter / the Search button
+        if (!SearchInContents)
+            RunNameSearch();
+        else if (string.IsNullOrWhiteSpace(value))
+            ClearSearchResults();
+    }
+
+    partial void OnSearchInContentsChanged(bool value)
+    {
+        if (!value)
+            RunNameSearch();
+        else
+            ClearSearchResults();
+    }
+
+    partial void OnSelectedSearchResultChanged(SearchResultViewModel? value)
+    {
+        if (value != null && value.Alias.Length > 0)
+            SelectEntryNode(value.Alias);
+    }
+
+    [RelayCommand]
+    private async Task Search()
+    {
+        if (_archive == null) return;
+
+        if (!SearchInContents)
+        {
+            RunNameSearch();
+            return;
+        }
+
+        if (string.IsNullOrEmpty(SearchQuery)) return;
+
+        Regex regex;
+        try
+        {
+            regex = new Regex(SearchQuery, RegexOptions.None, TimeSpan.FromSeconds(5));
+        }
+        catch (ArgumentException ex)
+        {
+            if (_window != null)
+                await Dialogs.ShowMessageAsync(_window, "Invalid Regex", $"Invalid regular expression:\n{ex.Message}");
+            return;
+        }
+
+        IsLoading = true;
+        try
+        {
+            var entries = _archive.Entries.ToList();
+            var results = await Task.Run(() =>
+            {
+                var found = new List<SearchResultViewModel>();
+                foreach (var entry in entries)
+                {
+                    string text;
+                    try
+                    {
+                        text = Encoding.UTF8.GetString(entry.GetDecompressedData());
+                    }
+                    catch
+                    {
+                        continue;
+                    }
+
+                    int lineNo = 0;
+                    foreach (var rawLine in text.Split('\n'))
+                    {
+                        lineNo++;
+                        var line = rawLine.TrimEnd('\r');
+
+                        bool isMatch;
+                        try
+                        {
+                            isMatch = regex.IsMatch(line);
+                        }
+                        catch (RegexMatchTimeoutException)
+                        {
+                            break;
+                        }
+
+                        if (!isMatch) continue;
+
+                        var snippet = line.Trim();
+                        if (snippet.Length > 120) snippet = snippet.Substring(0, 120) + "…";
+                        found.Add(new SearchResultViewModel
+                        {
+                            Alias = entry.Alias,
+                            Detail = $"line {lineNo}: {snippet}"
+                        });
+
+                        if (found.Count >= MaxContentResults)
+                            return found;
+                    }
+                }
+                return found;
+            });
+
+            SearchResults.Clear();
+            foreach (var r in results)
+                SearchResults.Add(r);
+            OnPropertyChanged(nameof(HasSearchResults));
+
+            SearchStatus = results.Count >= MaxContentResults
+                ? $"{results.Count} matches (stopped at {MaxContentResults})"
+                : $"{results.Count} match(es)";
+        }
+        finally
+        {
+            IsLoading = false;
+        }
+    }
+
+    private void RunNameSearch()
+    {
+        SearchResults.Clear();
+
+        var query = SearchQuery;
+        if (_archive == null || string.IsNullOrWhiteSpace(query))
+        {
+            SearchStatus = null;
+            OnPropertyChanged(nameof(HasSearchResults));
+            return;
+        }
+
+        int total = 0;
+        foreach (var entry in _archive.Entries)
+        {
+            if (!entry.Alias.Contains(query, StringComparison.OrdinalIgnoreCase)) continue;
+            total++;
+            if (SearchResults.Count < MaxNameResults)
+                SearchResults.Add(new SearchResultViewModel { Alias = entry.Alias });
+        }
+
+        SearchStatus = total > MaxNameResults
+            ? $"{total} file(s) (showing first {MaxNameResults})"
+            : $"{total} file(s)";
+        OnPropertyChanged(nameof(HasSearchResults));
+    }
+
+    private void ClearSearchResults()
+    {
+        SearchResults.Clear();
+        SearchStatus = null;
+        SelectedSearchResult = null;
+        OnPropertyChanged(nameof(HasSearchResults));
+    }
+
+    /// <summary>
+    /// Selects the tree node matching the given alias, expanding parent folders along the way.
+    /// </summary>
+    private void SelectEntryNode(string alias)
+    {
+        var parts = alias.Split('/');
+        var level = TreeRoots;
+        EntryTreeNodeViewModel? node = null;
+
+        foreach (var part in parts)
+        {
+            node = level.FirstOrDefault(n => n.Name == part);
+            if (node == null) return;
+            if (node.IsFolder)
+            {
+                node.IsExpanded = true;
+                level = node.Children;
+            }
+        }
+
+        if (node != null && !node.IsFolder)
+            SelectedNode = node;
+    }
+
     // =========================================================================
     // About
     // =========================================================================