DYN-9357: Installed packages list on Package Manager shows the latest version of the package

src/DynamoCoreWpf/Properties/Resources.en-US.resx

@@ -3034,10 +3034,22 @@ This package will be unloaded after the next Dynamo restart.</value>
     <value>Install</value>
     <comment>Used on the package manager search result card. If the package is not installed, the button will say 'Install'.</comment>
   </data>
+  <data name="PackageManagerUpdate" xml:space="preserve">
+    <value>Update</value>
+    <comment>Used on the package manager search result card when a different version is selected.</comment>
+  </data>
+  <data name="PackageManagerUninstall" xml:space="preserve">
+    <value>Uninstall</value>
+    <comment>Used on the package manager search result card when the installed version is selected.</comment>
+  </data>
   <data name="PackageManagerPackageUpdated" xml:space="preserve">
     <value>Updated</value>
     <comment>Displays next to the package name in the Package Search window if the package has been updated in the last 30 days.</comment>
   </data>
+  <data name="PackageManagerPackageUpdateAvailable" xml:space="preserve">
+    <value>New version available</value>
+      <comment>Displays next to the package name in the Package Search window if a newer version of the package is available.</comment>
+  </data>
   <data name="PackageManagerPackageNew" xml:space="preserve">
     <value>New</value>
     <comment>Displays next to the package name in the Package Search window if the package has been added in the last 30 days.</comment>

src/DynamoCoreWpf/Properties/Resources.resx

@@ -1291,10 +1291,22 @@ Don't worry, you'll have the option to save your work.</value>
     <value>Install</value>
     <comment>Used on the package manager search result card. If the package is not installed, the button will say 'Install'.</comment>
   </data>
+  <data name="PackageManagerUpdate" xml:space="preserve">
+    <value>Update</value>
+    <comment>Used on the package manager search result card when a different version is selected.</comment>
+  </data>
+  <data name="PackageManagerUninstall" xml:space="preserve">
+    <value>Uninstall</value>
+    <comment>Used on the package manager search result card when the installed version is selected.</comment>
+  </data>
   <data name="PackageManagerPackageUpdated" xml:space="preserve">
     <value>Updated</value>
     <comment>Displays next to the package name in the Package Search window if the package has been updated in the last 30 days.</comment>
   </data>
+  <data name="PackageManagerPackageUpdateAvailable" xml:space="preserve">
+    <value>New version available</value>
+      <comment>Displays next to the package name in the Package Search window if a newer version of the package is available.</comment>
+  </data>
   <data name="PackageManagerPackageNew" xml:space="preserve">
     <value>New</value>
     <comment>Displays next to the package name in the Package Search window if the package has been added in the last 30 days.</comment>

src/DynamoCoreWpf/PublicAPI.Unshipped.txt

@@ -1364,13 +1364,20 @@ Dynamo.PackageManager.ViewModels.PackageManagerSearchElementViewModel.DownloadLa
 Dynamo.PackageManager.ViewModels.PackageManagerSearchElementViewModel.DownloadLatestToCustomPathCommand.set -> void
 Dynamo.PackageManager.ViewModels.PackageManagerSearchElementViewModel.Downloads.get -> int
 Dynamo.PackageManager.ViewModels.PackageManagerSearchElementViewModel.Equals(Dynamo.PackageManager.ViewModels.PackageManagerSearchElementViewModel other) -> bool
+Dynamo.PackageManager.ViewModels.PackageManagerSearchElementViewModel.HasUpdateAvailable.get -> bool
+Dynamo.PackageManager.ViewModels.PackageManagerSearchElementViewModel.HasUpdateAvailable.set -> void
 Dynamo.PackageManager.ViewModels.PackageManagerSearchElementViewModel.HasUpvote.get -> bool
 Dynamo.PackageManager.ViewModels.PackageManagerSearchElementViewModel.Hosts.get -> System.Collections.Generic.List<string>
+Dynamo.PackageManager.ViewModels.PackageManagerSearchElementViewModel.InstallActionCommand.get -> System.Windows.Input.ICommand
+Dynamo.PackageManager.ViewModels.PackageManagerSearchElementViewModel.InstallActionText.get -> string
 Dynamo.PackageManager.ViewModels.PackageManagerSearchElementViewModel.IsDeprecated.get -> bool
 Dynamo.PackageManager.ViewModels.PackageManagerSearchElementViewModel.IsEnabledForInstall.get -> bool
+Dynamo.PackageManager.ViewModels.PackageManagerSearchElementViewModel.IsInstalledFallback.get -> bool
+Dynamo.PackageManager.ViewModels.PackageManagerSearchElementViewModel.IsInstalledVersionSelected.get -> bool
 Dynamo.PackageManager.ViewModels.PackageManagerSearchElementViewModel.IsOnwer.get -> bool
 Dynamo.PackageManager.ViewModels.PackageManagerSearchElementViewModel.IsSelectedVersionCompatible.get -> bool?
 Dynamo.PackageManager.ViewModels.PackageManagerSearchElementViewModel.IsSelectedVersionCompatible.set -> void
+Dynamo.PackageManager.ViewModels.PackageManagerSearchElementViewModel.IsUninstallState.get -> bool
 Dynamo.PackageManager.ViewModels.PackageManagerSearchElementViewModel.LatestVersion.get -> string
 Dynamo.PackageManager.ViewModels.PackageManagerSearchElementViewModel.LatestVersionCreated.get -> string
 Dynamo.PackageManager.ViewModels.PackageManagerSearchElementViewModel.Maintainers.get -> string
@@ -5160,6 +5167,9 @@ static Dynamo.Wpf.Properties.Resources.NodeAutoCompleteToolTip.get -> string
 static Dynamo.Wpf.Properties.Resources.OfflineStatusTooltip.get -> string
 static Dynamo.Wpf.Properties.Resources.OnlineStatusTooltip.get -> string
 static Dynamo.Wpf.Properties.Resources.PackageDuplicateAssembliesFoundMessage.get -> string
+static Dynamo.Wpf.Properties.Resources.PackageManagerPackageUpdateAvailable.get -> string
+static Dynamo.Wpf.Properties.Resources.PackageManagerUninstall.get -> string
+static Dynamo.Wpf.Properties.Resources.PackageManagerUpdate.get -> string
 static Dynamo.Wpf.Properties.Resources.PreferencesViewEnableNodeAutoCompleteNewUI.get -> string
 static Dynamo.Wpf.Properties.Resources.PreferencesViewEnableNodeAutoCompleteNewUITooltipText.get -> string
 static Dynamo.Wpf.Properties.Resources.NodeContextMenuEnablePeriodicUpdate.get -> string

src/DynamoCoreWpf/ViewModels/PackageManager/PackageManagerSearchElementViewModel.cs

@@ -7,6 +7,7 @@
 using System.Windows.Data;
 using System.Windows.Input;
 using Dynamo.ViewModels;
+using Dynamo.Wpf.Properties;
 using Dynamo.Wpf.ViewModels;
 using Greg.Responses;
 using Prism.Commands;
@@ -20,6 +21,10 @@ public class PackageManagerSearchElementViewModel : BrowserItemViewModel, IEquat
         public ICommand VisitSiteCommand { get; set; }
         public ICommand VisitRepositoryCommand { get; set; }
         public ICommand DownloadLatestToCustomPathCommand { get; set; }
+        public ICommand InstallActionCommand
+        {
+            get { return IsInstalledVersionSelected ? uninstallCommand : DownloadLatestCommand; }
+        }
 
         /// <summary>
         /// VM IsDeprecated property
@@ -69,6 +74,24 @@ public class PackageManagerSearchElementViewModel : BrowserItemViewModel, IEquat
         /// The currently selected version of a package
         /// </summary>
         private VersionInformation selectedVersion;
+        private string installedVersion;
+        private bool hasUpdateAvailable;
+        private readonly DelegateCommand uninstallCommand;
+        private Func<bool> canUninstall;
+        private bool HasInstalledVersion => !string.IsNullOrEmpty(installedVersion);
+
+        /// <summary>
+        /// True when the selected version is installed.
+        /// </summary>
+        public bool IsInstalledVersionSelected => SelectedVersion?.IsInstalled == true;
+        /// <summary>
+        /// True when the selected installed version cannot be uninstalled.
+        /// </summary>
+        public bool IsInstalledFallback => IsInstalledVersionSelected && canUninstall == null;
+        /// <summary>
+        /// True when the selected installed version can be uninstalled.
+        /// </summary>
+        public bool IsUninstallState => IsInstalledVersionSelected && canUninstall != null;
 
         public bool? IsSelectedVersionCompatible
         {
@@ -96,8 +119,71 @@ public VersionInformation SelectedVersion
                     selectedVersion = value;
 
                     // Update the compatibility info so the icon of the currently selected version is updated
-                    IsSelectedVersionCompatible = selectedVersion.IsCompatible;
+                    IsSelectedVersionCompatible = selectedVersion?.IsCompatible;
                     SearchElementModel.SelectedVersion = selectedVersion;
+                    RaisePropertyChanged(nameof(SelectedVersion));
+                    RaisePropertyChanged(nameof(InstallActionText));
+                    RaisePropertyChanged(nameof(InstallActionCommand));
+                    RaisePropertyChanged(nameof(IsInstalledVersionSelected));
+                    RaisePropertyChanged(nameof(IsInstalledFallback));
+                    RaisePropertyChanged(nameof(IsUninstallState));
+                    RefreshUninstallCommandCanExecute();
+                }
+            }
+        }
+
+        /// <summary>
+        /// The text to display for the install action button, which changes based on the package's installation state.
+        /// </summary>
+        public string InstallActionText
+        {
+            get
+            {
+                if (HasInstalledVersion)
+                {
+                    if (IsInstalledVersionSelected)
+                    {
+                        return IsInstalledFallback
+                            ? Resources.PackageDownloadStateInstalled
+                            : Resources.PackageManagerUninstall;
+                    }
+
+                    return Resources.PackageManagerUpdate;
+                }
+
+                return Resources.PackageManagerInstall;
+            }
+        }
+
+        /// <summary>
+        /// True if newer version is available for an installed package
+        /// </summary>
+        public bool HasUpdateAvailable
+        {
+            get { return hasUpdateAvailable; }
+            set
+            {
+                if (hasUpdateAvailable != value)
+                {
+                    hasUpdateAvailable = value;
+                    RaisePropertyChanged(nameof(HasUpdateAvailable));
+                }
+            }
+        }
+
+        internal ICommand UninstallCommand => uninstallCommand;
+        internal Func<bool> CanUninstall
+        {
+            get { return canUninstall; }
+            set
+            {
+                if (canUninstall != value)
+                {
+                    canUninstall = value;
+                    RaisePropertyChanged(nameof(InstallActionText));
+                    RaisePropertyChanged(nameof(IsInstalledFallback));
+                    RaisePropertyChanged(nameof(IsUninstallState));
+                    RefreshUninstallCommandCanExecute();
                 }
             }
         }
@@ -116,6 +202,7 @@ public PackageManagerSearchElementViewModel(PackageManagerSearchElement element,
             this.SearchElementModel = element;
             CanInstall = install;
             IsEnabledForInstall = isEnabledForInstall;
+            uninstallCommand = new DelegateCommand(OnRequestUninstall, () => CanUninstall?.Invoke() == true);
 
             // Attempts to show the latest compatible version. If no compatible, will return the latest instead.
             this.SelectedVersion = this.SearchElementModel.LatestCompatibleVersion;
@@ -128,7 +215,7 @@ public PackageManagerSearchElementViewModel(PackageManagerSearchElement element,
 
             this.DownloadLatestCommand = new DelegateCommand(
                 () => OnRequestDownload(false),
-                () => !SearchElementModel.IsDeprecated && CanInstall);
+                () => !SearchElementModel.IsDeprecated);
             this.DownloadLatestToCustomPathCommand = new DelegateCommand(() => OnRequestDownload(true));
 
             this.UpvoteCommand = new DelegateCommand(SearchElementModel.Upvote, () => canLogin);
@@ -143,11 +230,11 @@ private void OnSearchElementModelPropertyChanged(object sender, PropertyChangedE
         {
             if (e.PropertyName == nameof(SearchElementModel.LatestCompatibleVersion))
             {
-                this.SelectedVersion = this.SearchElementModel.LatestCompatibleVersion;
+                SetDefaultSelectedVersion();
             }
             if (e.PropertyName == nameof(SearchElementModel.VersionDetails))
             {
-                this.VersionInformationList = this.SearchElementModel.VersionDetails;
+                SetDefaultSelectedVersion();
             }
         }
 
@@ -191,8 +278,11 @@ public bool CanInstall
 
             internal set
             {
-                canInstall = value;
-                RaisePropertyChanged(nameof(CanInstall));
+                if (canInstall != value)
+                {
+                    canInstall = value;
+                    RaisePropertyChanged(nameof(CanInstall));
+                }
             }
         }
 
@@ -262,6 +352,7 @@ public List<VersionInformation> VersionInformationList
                 {
                     versionInformationList = value;
                     RaisePropertyChanged(nameof(VersionInformationList));
+                    UpdateInstalledVersionFlags();
                 }
             }
         }
@@ -278,13 +369,75 @@ public ICollectionView ReversedVersionInformationList
             }
         }
 
+        internal void UpdateInstalledVersion(string version, bool setDefaultSelection)
+        {
+            installedVersion = version;
+            UpdateInstalledVersionFlags();
+
+            if (setDefaultSelection)
+            {
+                SetDefaultSelectedVersion();
+            }
+            RaisePropertyChanged(nameof(InstallActionText));
+            RaisePropertyChanged(nameof(InstallActionCommand));
+            RaisePropertyChanged(nameof(IsInstalledVersionSelected));
+            RaisePropertyChanged(nameof(IsInstalledFallback));
+            RaisePropertyChanged(nameof(IsUninstallState));
+            RefreshUninstallCommandCanExecute();
+        }
+
+        private void SetDefaultSelectedVersion()
+        {
+            var defaultVersion = GetDefaultSelectedVersion();
+            if (defaultVersion != null && SelectedVersion != defaultVersion)
+            {
+                SelectedVersion = defaultVersion;
+            }
+        }
+
+        private VersionInformation GetDefaultSelectedVersion()
+        {
+            if (!string.IsNullOrEmpty(installedVersion))
+            {
+                var installedInfo = VersionInformationList?.FirstOrDefault(v => v.Version == installedVersion);
+                if (installedInfo != null)
+                {
+                    return installedInfo;
+                }
+            }
+
+            return SearchElementModel?.LatestCompatibleVersion;
+        }
+
+        private void UpdateInstalledVersionFlags()
+        {
+            if (VersionInformationList == null) return;
+
+            foreach (var versionInfo in VersionInformationList)
+            {
+                versionInfo.IsInstalled = !string.IsNullOrEmpty(installedVersion) &&
+                                          string.Equals(versionInfo.Version, installedVersion, StringComparison.OrdinalIgnoreCase);
+            }
+
+            RaisePropertyChanged(nameof(ReversedVersionInformationList));
+        }
+
+        private void RefreshUninstallCommandCanExecute()
+        {
+            if (uninstallCommand is DelegateCommand delegateCommand)
+            {
+                delegateCommand.RaiseCanExecuteChanged();
+            }
+        }
+
         private List<String> CustomPackageFolders;
         private bool? isSelectedVersionCompatible;
 
         public delegate void PackageSearchElementDownloadHandler(
             PackageManagerSearchElement element, PackageVersion version, string downloadPath = null);
         public event PackageSearchElementDownloadHandler RequestDownload;
-
+        internal event Action<PackageManagerSearchElementViewModel> RequestUninstall;
+
         public void OnRequestDownload(PackageVersion version, bool downloadToCustomPath)
         {
             string downloadPath = String.Empty;
@@ -301,9 +454,19 @@ public void OnRequestDownload(PackageVersion version, bool downloadToCustomPath)
                 RequestDownload(this.SearchElementModel, version, downloadPath);
         }
 
+        private void OnRequestUninstall()
+        {
+            if (RequestUninstall != null)
+            {
+                RequestUninstall(this);
+            }
+        }
+
         private void OnRequestDownload(bool downloadToCustomPath)
         {
-            var version = this.SearchElementModel.Header.versions.First(x => x.version.Equals(SelectedVersion.Version));
+            var version = this.SearchElementModel?.Header?.versions
+                ?.FirstOrDefault(x => x.version.Equals(SelectedVersion.Version));
+            if (version == null) return;
 
             string downloadPath = String.Empty;