DYN-1874: I want to download missing graph package dependencies easily

src/DynamoCore/Graph/Workspaces/PackageDependencyInfo.cs

@@ -6,7 +6,7 @@ namespace Dynamo.Graph.Workspaces
     /// <summary>
     /// Enum containing the different types of package dependency states.
     /// </summary>
-    internal enum PackageDependencyState
+    public enum PackageDependencyState
     {
         Loaded,            // Correct package and version loaded.
         IncorrectVersion,  // Correct package but incorrect version. 
@@ -15,20 +15,36 @@ internal enum PackageDependencyState
         RequiresRestart    // Restart needed inorder to complete the uninstall of some package. 
     }
 
+    /// <summary>
+    /// Interface for types containing info about a package
+    /// </summary>
+    public interface IPackageInfo
+    {
+        /// <summary>
+        /// Name of the package
+        /// </summary>
+        string Name { get; }
+
+        /// <summary>
+        /// Version of the package
+        /// </summary>
+        Version Version { get; }
+    }
+
     /// <summary>
     /// Class containing info about a package
     /// </summary>
-    public class PackageInfo
+    public class PackageInfo : IPackageInfo
     {
         /// <summary>
         /// Name of the package
         /// </summary>
-        internal string Name { get; set; }
+        public string Name { get; private set; }
 
         /// <summary>
         /// Version of the package
         /// </summary>
-        internal Version Version { get; set; }
+        public Version Version { get; private set; }
 
         /// <summary>
         /// Create a package info object from the package name and version
@@ -85,7 +101,7 @@ public override string ToString()
         }
     }
 
-    internal enum ReferenceType
+    public enum ReferenceType
     {
         NodeModel,
         Package,
@@ -100,7 +116,7 @@ internal enum ReferenceType
     /// <summary>
     /// An interface that describes a dependency a workspace can have on other code.
     /// </summary>
-    interface INodeLibraryDependencyInfo
+    public interface INodeLibraryDependencyInfo
     {
         /// <summary>
         /// The type of reference this dependency is.
@@ -133,12 +149,17 @@ interface INodeLibraryDependencyInfo
         /// </summary>
         [Obsolete("This property is obsolete", false)]
         bool IsLoaded { get; set; }
+
+        /// <summary>
+        /// The state of this dependency
+        /// </summary>
+        PackageDependencyState State { get; }
     }
 
     /// <summary>
     /// Class containing info about a workspace package dependency
     /// </summary>
-    internal class PackageDependencyInfo : INodeLibraryDependencyInfo
+    internal class PackageDependencyInfo : INodeLibraryDependencyInfo, IPackageInfo
     {
         private PackageDependencyState _state;
         /// <summary>

src/DynamoCoreWpf/DynamoCoreWpf.csproj

@@ -295,6 +295,7 @@
     <Compile Include="ViewModels\Core\GalleryViewModel.cs" />
     <Compile Include="ViewModels\Core\HomeWorkspaceViewModel.cs" />
     <Compile Include="ViewModels\Core\SerializationExtensions.cs" />
+    <Compile Include="ViewModels\PackageManager\IPackageDownloader.cs" />
     <Compile Include="ViewModels\PackageManager\PackagePathViewModel.cs" />
     <Compile Include="ViewModels\Preview\CompactBubbleViewModel.cs" />
     <Compile Include="ViewModels\RunSettingsViewModel.cs" />

src/DynamoCoreWpf/Extensions/ViewLoadedParams.cs

@@ -49,6 +49,14 @@ public IRenderPackageFactory RenderPackageFactory
             get { return dynamoViewModel.RenderPackageFactoryViewModel.Factory; }
         }
 
+        /// <summary>
+        /// A reference to package install operations on the package manager
+        /// </summary>
+        public IPackageInstaller PackageInstaller
+        {
+            get { return dynamoViewModel.PackageManagerClientViewModel; }
+        }
+
         /// <summary>
         /// A reference to the Dynamo Window object. Useful for correctly setting the parent of a 
         /// newly created window.

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

@@ -2224,8 +2224,14 @@ Uninstall the following packages: {0}?</value>
   </data>
   <data name="PackageHostDependencyFilterContextItem" xml:space="preserve">
     <value>Packages requires the specified host to run.</value>
- </data>
+  </data>
   <data name="MessageUninstallSamePackage" xml:space="preserve">
     <value>"The package {0} is already installed. To reinstall it, you must first uninstall it and restart to complete the uninstall. Would you like to mark {0} for uninstall?"</value>
   </data>
+  <data name="MessagePackageNotFound" xml:space="preserve">
+    <value>{0} was not found and could not be downloaded.</value>
+  </data>
+  <data name="MessagePackageVersionNotFound" xml:space="preserve">
+    <value>Version {0} of {1} could not be found.</value>
+  </data>
 </root>

src/DynamoCoreWpf/Properties/Resources.resx

@@ -2231,4 +2231,10 @@ Uninstall the following packages: {0}?</value>
   <data name="MessageUninstallSamePackage" xml:space="preserve">
     <value>"The package {0} is already installed. To reinstall it, you must first uninstall it and restart to complete the uninstall. Would you like to mark {0} for uninstall?"</value>
   </data>
+  <data name="MessagePackageNotFound" xml:space="preserve">
+    <value>{0} was not found and could not be downloaded.</value>
+  </data>
+  <data name="MessagePackageVersionNotFound" xml:space="preserve">
+    <value>Version {0} of {1} could not be found.</value>
+  </data>
 </root>

src/DynamoCoreWpf/ViewModels/PackageManager/IPackageDownloader.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Dynamo.Graph.Workspaces;
+
+namespace Dynamo.ViewModels
+{
+    /// <summary>
+    /// An interface containing operations for installing Dynamo packages
+    /// </summary>
+    public interface IPackageInstaller
+    {
+        /// <summary>
+        /// Initiates download and install of a package
+        /// </summary>
+        /// <param name="package"></param>
+        /// <param name="downloadPath"></param>
+        void DownloadAndInstallPackage(IPackageInfo package, string downloadPath = null);
+    }
+}