// Copyright (c) Microsoft Corporation.  All Rights Reserved.  See License.txt in the project root for license information.
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using System.Diagnostics;
using System.ComponentModel;
using System.Globalization;
using System.IO;
using System.Collections;
using System.Xml;
using System.Text;
using System.Text.RegularExpressions;
using System.Net;
using System.Reflection;
using Microsoft.VisualStudio.TextManager.Interop;
using Microsoft.VisualStudio.OLE.Interop;
using Microsoft.VisualStudio.Shell.Interop;
using Microsoft.VisualStudio.Designer.Interfaces;
using Microsoft.VisualStudio.Shell;
using Microsoft.VisualStudio.PlatformUI;
using Microsoft.Win32;
using IOleServiceProvider = Microsoft.VisualStudio.OLE.Interop.IServiceProvider;
using IServiceProvider = System.IServiceProvider;
using ShellConstants = Microsoft.VisualStudio.Shell.Interop.Constants;
using OleConstants = Microsoft.VisualStudio.OLE.Interop.Constants;
using VSRegistry = Microsoft.VisualStudio.Shell.VSRegistry;
using System.Security.Permissions;
using System.Security.Policy;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.Versioning;

namespace Microsoft.VisualStudio.FSharp.ProjectSystem
{
    /// <summary>
    ///  helper class to check the status of the solution pane
    ///  this is a workaround needed because F# cannot reference and use two versions of an
    ///  assembly (Microsoft.VisualStudio.Shell.14 & 15 in this case)
    /// </summary>
    static class SolutionPaneUtil
    {   /// uses the serviceProvider and guid to identify a node in the solution pane and check if it
        /// is currently in rename mode or not. If it is return the pivotTreeView 
        public static HierarchyNode TryRenameAndReturnNode ( ProjectNode root, Guid solutionHierarchyNode, UInt32 id,Func<string> getEditLabel )
        {
            var window = UIHierarchyUtilities.GetUIHierarchyWindow ( root.Site, solutionHierarchyNode );
            if ( window is SolutionNavigatorPane )
            {
                var snp = (SolutionNavigatorPane) window;
                var tree = snp?.Navigator?.TreeView;
                if ( tree != null && tree.IsInRenameMode )
                {
                    var oldName = getEditLabel();
                    // if tree is in rename mode now - commit renaming
                    // since rename is implemented via remove\add set of operations - after renaming we need to fetch node that corresponds to the current one

                    // rename may fail (i.e if new name contains invalid characters), in this case user will see error message and after that failure will be swallowed
                    // if this happens - we need to cancel current transaction,
                    // otherwise it will hold current hierarchy node. After move operation is completed - current node will become invalid => may lead to ObjectDisposedExceptions.
                    // Since error is not appear directly in the code - we check if old and new labels match and if yes - treat it as reason that error happens
                    tree.CommitRename ( Microsoft.Internal.VisualStudio.PlatformUI.RenameItemCompletionFocusBehavior.Refocus );
                    var node = root.ItemIdMap[id];
                    if (node != null && node.GetEditLabel() == oldName )
                    {
                        tree.CancelRename ( Microsoft.Internal.VisualStudio.PlatformUI.RenameItemCompletionFocusBehavior.Refocus );
                    }
                    return node;
                }
            }
            return null;
        }
    }


    internal class FSharpCoreVersion
    {
        public string Version { get; private set; }
        public string Description { get; private set; }

        public FSharpCoreVersion(string version, string description)
        {
            Version = version;
            Description = description;
        }

        public override string ToString()
        {
            return Description;
        }
    }

    internal interface IFSharpCoreVersionLookupService
    {
        FSharpCoreVersion[] ListAvailableFSharpCoreVersions(FrameworkName targetFramework);
    }

    internal static class Utilities
    {
        private const string defaultMSBuildVersion = "2.0";
        public const string FsCorePublicKeyToken = "b03f5f7f11d50a3a";

        /// <summary>
        /// Look in the registry under the current hive for the path
        /// of MSBuild
        /// </summary>
        /// <returns></returns>
        [SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Ms")]
        [SuppressMessage("Microsoft.Naming", "CA1704:IdentifiersShouldBeSpelledCorrectly", MessageId = "msbuild")]
        public static string GetMsBuildPath(IServiceProvider serviceProvider)
        {
            return GetMsBuildPath(serviceProvider, defaultMSBuildVersion);
        }

        /// <summary>
        /// Search the registry for the tools path for MSBuild.
        /// </summary>
        /// <param name="serviceProvider">The service provider.</param>
        /// <param name="version">Msbuild version.</param>
        /// <returns>The msbuild tools path</returns>
        [SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Ms")]
        public static string GetMsBuildPath(IServiceProvider serviceProvider, string version)
        {
            string msBuildPath = null;
            using (RegistryKey root = VSRegistry.RegistryRoot(serviceProvider, __VsLocalRegistryType.RegType_Configuration, false))
            {
                // Get the value from the registry
                using (RegistryKey vsKey = root.OpenSubKey("MSBuild", false))
                {
                    msBuildPath = (string)vsKey.GetValue("MSBuildBinPath", null);
                }
            }
            if (!string.IsNullOrEmpty(msBuildPath))
            {
                return msBuildPath;
            }

            // The path to MSBuild was not found in the VisualStudio's registry hive, so try to
            // find it in the new MSBuild hive.
            string registryPath = string.Format(CultureInfo.InvariantCulture, "Software\\Microsoft\\MSBuild\\ToolsVersions\\{0}", version);
            using (Microsoft.Win32.RegistryKey msbuildKey = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(registryPath, false))
            {
                msBuildPath = (string)msbuildKey.GetValue("MSBuildToolsPath", null);
            }
            if (string.IsNullOrEmpty(msBuildPath))
            {
                string error = SR.GetString(SR.ErrorMsBuildRegistration, CultureInfo.CurrentUICulture);
                throw new FileLoadException(error);
            }
            return msBuildPath;
        }

        /// <summary>
        /// Is Visual Studio in design mode.
        /// </summary>
        /// <param name="site">The service provider.</param>
        /// <returns>true if visual studio is in design mode</returns>
        public static bool IsVisualStudioInDesignMode(IServiceProvider site)
        {
            IVsMonitorSelection selectionMonitor = site.GetService(typeof(IVsMonitorSelection)) as IVsMonitorSelection;
            uint cookie = 0;
            int active = 0;
            Guid designContext = VSConstants.UICONTEXT_DesignMode;
            ErrorHandler.ThrowOnFailure(selectionMonitor.GetCmdUIContextCookie(ref designContext, out cookie));
            ErrorHandler.ThrowOnFailure(selectionMonitor.IsCmdUIContextActive(cookie, out active));
            return active != 0;
        }

        /// <devdoc>
        /// Is an extensibility object executing an automation function.
        /// </devdoc>
        /// <param name="serviceProvider">The service provider.</param>
        /// <returns>true if the extensibility object is executing an automation function.</returns>
        public static bool IsInAutomationFunction(IServiceProvider serviceProvider)
        {
            if (serviceProvider == null)
            {
                throw new ArgumentException("serviceProvider");
            }

            IVsExtensibility3 extensibility = serviceProvider.GetService(typeof(EnvDTE.IVsExtensibility)) as IVsExtensibility3;

            if (extensibility == null)
            {
                return false;
            }
            int inAutomation = 0;
            ErrorHandler.ThrowOnFailure(extensibility.IsInAutomationFunction(out inAutomation));
            return inAutomation != 0;
        }

        /// <summary>
        /// Creates a semicolon delimited list of strings. This can be used to provide the properties for VSHPROPID_CfgPropertyPagesCLSIDList, VSHPROPID_PropertyPagesCLSIDList, VSHPROPID_PriorityPropertyPagesCLSIDList
        /// </summary>
        /// <param name="guids">An array of Guids.</param>
        /// <returns>A semicolon delimited string, or null</returns>
        public static string CreateSemicolonDelimitedListOfStringFromGuids(Guid[] guids)
        {
            if (guids == null || guids.Length == 0)
            {
                return null;
            }

            // Create a StringBuilder with a pre-allocated buffer big enough for the
            // final string. 39 is the length of a GUID in the "B" form plus the final ';'
            StringBuilder stringList = new StringBuilder(39 * guids.Length);
            for (int i = 0; i < guids.Length; i++)
            {
                stringList.Append(guids[i].ToString("B"));
                stringList.Append(";");
            }

            return stringList.ToString().TrimEnd(';');
        }

        private static char[] curlyBraces = new char[] { '{', '}' };
        /// <summary>
        /// Take list of guids as a single string and generate an array of Guids from it
        /// </summary>
        /// <param name="guidList">Semi-colon separated list of Guids</param>
        /// <returns>Array of Guids</returns>
        public static Guid[] GuidsArrayFromSemicolonDelimitedStringOfGuids(string guidList)
        {
            if (guidList == null)
            {
                return null;
            }

            List<Guid> guids = new List<Guid>();
            string[] guidsStrings = guidList.Split(';');
            foreach (string guid in guidsStrings)
            {
                if (!String.IsNullOrEmpty(guid))
                    guids.Add(new Guid(guid.Trim(curlyBraces)));
            }

            return guids.ToArray();
        }

        /// <summary>
        /// Validates a file path by validating all file parts. If the 
        /// the file name is invalid it throws an exception if the project is in automation. Otherwise it shows a dialog box with the error message.
        /// </summary>
        /// <param name="serviceProvider">The service provider</param>
        /// <param name="filePath">A full path to a file name</param>
        /// <exception cref="InvalidOperationException">In case of failure an InvalidOperationException is thrown.</exception>
        public static void ValidateFileName(IServiceProvider serviceProvider, string filePath)
        {
            string errorMessage = String.Empty;
            if (String.IsNullOrEmpty(filePath))
            {
                errorMessage = SR.GetString(SR.ErrorInvalidFileName, CultureInfo.CurrentUICulture);
            }
            else if (filePath.Length > NativeMethods.MAX_PATH)
            {
                errorMessage = String.Format(CultureInfo.CurrentCulture, SR.GetString(SR.PathTooLong, CultureInfo.CurrentUICulture), filePath);
            }
            else if (ContainsInvalidFileNameChars(filePath))
            {
                errorMessage = SR.GetString(SR.ErrorInvalidFileName, CultureInfo.CurrentUICulture);
            }

            if (errorMessage.Length == 0)
            {
                string fileName = Path.GetFileName(filePath);
                if (String.IsNullOrEmpty(fileName) || IsFileNameInvalid(fileName))
                {
                    errorMessage = SR.GetString(SR.ErrorInvalidFileName, CultureInfo.CurrentUICulture);
                }
                else
                {
                    string fileNameWithoutExtension = Path.GetFileNameWithoutExtension(fileName);

                    // If there is no filename or it starts with a leading dot issue an error message and quit.
                    if (String.IsNullOrEmpty(fileNameWithoutExtension) || fileNameWithoutExtension[0] == '.')
                    {
                        errorMessage = SR.GetString(SR.FileNameCannotContainALeadingPeriod, CultureInfo.CurrentUICulture);
                    }
                }
            }

            if (errorMessage.Length > 0)
            {
                // If it is not called from an automation method show a dialog box.
                if (!Utilities.IsInAutomationFunction(serviceProvider))
                {
                    string title = null;
                    OLEMSGICON icon = OLEMSGICON.OLEMSGICON_CRITICAL;
                    OLEMSGBUTTON buttons = OLEMSGBUTTON.OLEMSGBUTTON_OK;
                    OLEMSGDEFBUTTON defaultButton = OLEMSGDEFBUTTON.OLEMSGDEFBUTTON_FIRST;
                    VsShellUtilities.ShowMessageBox(serviceProvider, title, errorMessage, icon, buttons, defaultButton);
                }
                else
                {
                    throw new InvalidOperationException(errorMessage);
                }
            }

        }

        /// <summary>
        /// Creates a CALPOLESTR from a list of strings 
        /// It is the responsibility of the caller to release this memory.
        /// </summary>
        /// <param name="strings"></param>
        /// <returns>A CALPOLESTR that was created from the list of strings.</returns>
        [SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "CALPOLESTR")]
        public static CALPOLESTR CreateCALPOLESTR(IList<string> strings)
        {
            CALPOLESTR calpolStr = new CALPOLESTR();

            if (strings != null)
            {
                // Demand unmanaged permissions in order to access unmanaged memory.
                new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Demand();

                calpolStr.cElems = (uint)strings.Count;

                int size = Marshal.SizeOf(typeof(IntPtr));

                calpolStr.pElems = Marshal.AllocCoTaskMem(strings.Count * size);

                IntPtr ptr = calpolStr.pElems;

                foreach (string aString in strings)
                {
                    IntPtr tempPtr = Marshal.StringToCoTaskMemUni(aString);
                    Marshal.WriteIntPtr(ptr, tempPtr);
                    ptr = new IntPtr(ptr.ToInt64() + size);
                }
            }

            return calpolStr;
        }

        /// <summary>
        /// Creates a CADWORD from a list of tagVsSccFilesFlags. Memory is allocated for the elems. 
        /// It is the responsibility of the caller to release this memory.
        /// </summary>
        /// <param name="flags"></param>
        /// <returns>A CADWORD created from the list of tagVsSccFilesFlags.</returns>
        [SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "CADWORD")]
        public static CADWORD CreateCADWORD(IList<tagVsSccFilesFlags> flags)
        {
            CADWORD cadWord = new CADWORD();

            if (flags != null)
            {
                // Demand unmanaged permissions in order to access unmanaged memory.
                new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Demand();

                cadWord.cElems = (uint)flags.Count;

                int size = Marshal.SizeOf(typeof(UInt32));

                cadWord.pElems = Marshal.AllocCoTaskMem(flags.Count * size);

                IntPtr ptr = cadWord.pElems;

                foreach (tagVsSccFilesFlags flag in flags)
                {
                    Marshal.WriteInt32(ptr, (int)flag);
                    ptr = new IntPtr(ptr.ToInt64() + size);
                }
            }

            return cadWord;
        }

        /// <summary>
        /// Splits a bitmap from a Stream into an ImageList
        /// </summary>
        /// <param name="imageStream">A Stream representing a Bitmap</param>
        /// <returns>An ImageList object representing the images from the given stream</returns>
        public static ImageList GetImageList(Stream imageStream)
        {
            ImageList ilist = new ImageList();

            if (imageStream == null)
            {
                return ilist;
            }
            ilist.ColorDepth = ColorDepth.Depth24Bit;
            ilist.ImageSize = new Size(16, 16);
            Bitmap bitmap = new Bitmap(imageStream);
            ilist.Images.AddStrip(bitmap);
            ilist.TransparentColor = Color.Magenta;
            return ilist;
        }

        /// <summary>
        /// Splits a bitmap from a pointer to an ImageList
        /// </summary>
        /// <param name="imageListAsPointer">A pointer to a bitmap of images to split</param>
        /// <returns>An ImageList object representing the images from the given stream</returns>
        public static ImageList GetImageList(object imageListAsPointer)
        {
            ImageList images = null;

            IntPtr intPtr = new IntPtr((int)imageListAsPointer);
            HandleRef hImageList = new HandleRef(null, intPtr);
            int count = UnsafeNativeMethods.ImageList_GetImageCount(hImageList);

            if (count > 0)
            {
                // Create a bitmap big enough to hold all the images
                Bitmap b = new Bitmap(16 * count, 16);
                Graphics g = Graphics.FromImage(b);

                // Loop through and extract each image from the imagelist into our own bitmap
                IntPtr hDC = IntPtr.Zero;
                try
                {
                    hDC = g.GetHdc();
                    HandleRef handleRefDC = new HandleRef(null, hDC);
                    for (int i = 0; i < count; i++)
                    {
                        UnsafeNativeMethods.ImageList_Draw(hImageList, i, handleRefDC, i * 16, 0, NativeMethods.ILD_NORMAL);
                    }
                }
                finally
                {
                    if (g != null && hDC != IntPtr.Zero)
                    {
                        g.ReleaseHdc(hDC);
                    }
                }

                // Create a new imagelist based on our stolen images
                images = new ImageList();
                images.ColorDepth = ColorDepth.Depth24Bit;
                images.ImageSize = new Size(16, 16);
                images.Images.AddStrip(b);
            }
            return images;
        }

        /// <summary>
        /// Gets the active configuration name.
        /// </summary>
        /// <param name="automationObject">The automation object.</param>
        /// <returns>The name of the active configuration.</returns>        
        public static string GetActiveConfigurationName(EnvDTE.Project automationObject)
        {
            if (automationObject == null)
            {
                throw new ArgumentNullException("automationObject");
            }

            string currentConfigName = string.Empty;
            if (automationObject.ConfigurationManager != null)
            {
                EnvDTE.Configuration activeConfig = automationObject.ConfigurationManager.ActiveConfiguration;
                if (activeConfig != null)
                {
                    currentConfigName = activeConfig.ConfigurationName;
                }
            }
            return currentConfigName;

        }


        /// <summary>
        /// Verifies that two objects represent the same instance of a COM object.
        /// This essentially compares the IUnknown pointers of the 2 objects.
        /// This is needed in scenario where aggregation is involved.
        /// </summary>
        /// <param name="obj1">Can be an object, interface or IntPtr</param>
        /// <param name="obj2">Can be an object, interface or IntPtr</param>
        /// <returns>True if the 2 items represent the same thing</returns>
        [SuppressMessage("Microsoft.Naming", "CA1720:IdentifiersShouldNotContainTypeNames", MessageId = "obj")]
        public static bool IsSameComObject(object obj1, object obj2)
        {
            bool isSame = false;
            IntPtr unknown1 = IntPtr.Zero;
            IntPtr unknown2 = IntPtr.Zero;
            try
            {
                // If we have 2 null, then they are not COM objects and as such "it's not the same COM object"
                if (obj1 != null && obj2 != null)
                {
                    unknown1 = QueryInterfaceIUnknown(obj1);
                    unknown2 = QueryInterfaceIUnknown(obj2);

                    isSame = IntPtr.Equals(unknown1, unknown2);
                }
            }
            finally
            {
                if (unknown1 != IntPtr.Zero)
                {
                    Marshal.Release(unknown1);
                }

                if (unknown2 != IntPtr.Zero)
                {
                    Marshal.Release(unknown2);
                }

            }

            return isSame;
        }

        /// <summary>
        /// Retrieve the IUnknown for the managed or COM object passed in.
        /// </summary>
        /// <param name="objToQuery">Managed or COM object.</param>
        /// <returns>Pointer to the IUnknown interface of the object.</returns>
        public static IntPtr QueryInterfaceIUnknown(object objToQuery)
        {
            bool releaseIt = false;
            IntPtr unknown = IntPtr.Zero;
            IntPtr result;
            try
            {
                if (objToQuery is IntPtr)
                {
                    unknown = (IntPtr)objToQuery;
                }
                else
                {
                    // This is a managed object (or RCW)
                    unknown = Marshal.GetIUnknownForObject(objToQuery);
                    releaseIt = true;
                }

                // We might already have an IUnknown, but if this is an aggregated
                // object, it may not be THE IUnknown until we QI for it.                
                Guid IID_IUnknown = VSConstants.IID_IUnknown;
                ErrorHandler.ThrowOnFailure(Marshal.QueryInterface(unknown, ref IID_IUnknown, out result));
            }
            finally
            {
                if (releaseIt && unknown != IntPtr.Zero)
                {
                    Marshal.Release(unknown);
                }

            }

            return result;
        }

        /// <summary>
        /// Returns true if the name that can represent a path, absolute or relative, or a file name contains invalid filename characters.
        /// </summary>
        /// <param name="name">File name</param>
        /// <returns>true if file name is invalid</returns>
        public static bool ContainsInvalidFileNameChars(string name)
        {
            if (String.IsNullOrEmpty(name))
            {
                return true;
            }

            try
            {
                if (Path.IsPathRooted(name) && !name.StartsWith(@"\\", StringComparison.Ordinal))
                {
                    string root = Path.GetPathRoot(name);
                    name = name.Substring(root.Length);
                }
            }
            // The Path methods used by ContainsInvalidFileNameChars return argument exception if the filePath contains invalid characters.
            catch (ArgumentException)
            {
                return true;
            }

            Microsoft.VisualStudio.Shell.Url uri = new Microsoft.VisualStudio.Shell.Url(name);

            // This might be confusing bur Url.IsFile means that the uri represented by the name is either absolute or relative.
            if (uri.IsFile)
            {
                string[] segments = uri.Segments;
                if (segments != null && segments.Length > 0)
                {
                    foreach (string segment in segments)
                    {
                        if (IsFilePartInValid(segment))
                        {
                            return true;
                        }
                    }

                    // Now the last segment should be specially taken care, since that cannot be all dots or spaces.
                    string lastSegment = segments[segments.Length - 1];
                    string filePart = Path.GetFileNameWithoutExtension(lastSegment);
                    if (IsFileNameAllGivenCharacter('.', filePart) || IsFileNameAllGivenCharacter(' ', filePart))
                    {
                        return true;
                    }
                }
            }
            else
            {
                // The assumption here is that we got a file name.
                string filePart = Path.GetFileNameWithoutExtension(name);
                if (IsFileNameAllGivenCharacter('.', filePart) || IsFileNameAllGivenCharacter(' ', filePart))
                {
                    return true;
                }


                return IsFilePartInValid(name);
            }

            return false;
        }

        /// Checks if a file name is valid.
        /// <param name="fileName">The name of the file</param>
        /// <returns>True if the file is valid.</returns>
        public static bool IsFileNameInvalid(string fileName)
        {
            if (String.IsNullOrEmpty(fileName))
            {
                return true;
            }

            if (IsFileNameAllGivenCharacter('.', fileName) || IsFileNameAllGivenCharacter(' ', fileName))
            {
                return true;
            }


            return IsFilePartInValid(fileName);

        }

        /// <summary>
        /// Helper method to call a converter explicitly to convert to an enum type
        /// </summary>
        /// <typeparam name="T">THe enum to convert to</typeparam>
        /// <param name="value">The enum value to be converted to</param>
        /// <param name="typeToConvert">The type to convert</param>
        /// <param name="culture">The culture to use to read the localized strings</param>
        /// <returns></returns>
        public static object ConvertToType<T>(T value, Type typeToConvert, CultureInfo culture)
            where T : struct
        {
            EnumConverter converter = GetEnumConverter<T>();
            if (converter == null)
            {
                return null;
            }
            if (converter.CanConvertTo(typeToConvert))
            {
                return converter.ConvertTo(null, culture, value, typeToConvert);
            }

            return null;
        }

        /// <summary>
        /// Helper method for converting from a string to an enum using a converter.
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="value"></param>
        /// <param name="culture">The culture to use to read the localized strings</param>
        /// <returns></returns>
        public static Nullable<T> ConvertFromType<T>(string value, CultureInfo culture)
            where T : struct
        {
            Nullable<T> returnValue = new Nullable<T>();

            returnValue = returnValue.GetValueOrDefault();

            if (value == null)
            {
                return returnValue;
            }

            EnumConverter converter = GetEnumConverter<T>();
            if (converter == null)
            {
                return returnValue;
            }

            if (converter.CanConvertFrom(value.GetType()))
            {
                object converted = converter.ConvertFrom(null, culture, value);

                if (converted != null && (converted is T))
                {
                    returnValue = (T)converted;
                }
            }

            return returnValue;
        }


        /// <summary>
        /// Sets a string value from an enum
        /// </summary>
        /// <typeparam name="T">The enum type</typeparam>
        /// <param name="enumValue">The value of the enum.</param>
        /// <returns></returns>
        public static string SetStringValueFromConvertedEnum<T>(T enumValue, CultureInfo culture)
            where T : struct
        {
            object convertToType = ConvertToType<T>(enumValue, typeof(string), culture);
            if (convertToType == null || !(convertToType is string))
            {
                return String.Empty;
            }

            return (string)convertToType;
        }


        /// <summary>
        /// Initializes the in memory project. Sets BuildEnabled on the project to true.
        /// </summary>
        /// <param name="buildEngine">The build engine to use to create a build project.</param>
        /// <param name="fullProjectPath">The full path of the project.</param>
        /// <returns>A loaded msbuild project.</returns>
        public static Microsoft.Build.Evaluation.Project InitializeMsBuildProject(Microsoft.Build.Evaluation.ProjectCollection buildEngine, string fullProjectPath, IDictionary<String,String> globalProperties)
        {
            if (buildEngine == null)
            {
                throw new ArgumentNullException("buildEngine");
            }

            if (String.IsNullOrEmpty(fullProjectPath))
            {
                throw new ArgumentException(SR.GetString(SR.InvalidParameter, CultureInfo.CurrentUICulture), "fullProjectPath");
            }

            // Check if the project already has been loaded with the fullProjectPath. If yes return the build project associated to it.
            var prjs = new List<Microsoft.Build.Evaluation.Project>(buildEngine.GetLoadedProjects(fullProjectPath));
            System.Diagnostics.Debug.Assert(prjs.Count <= 1, string.Format("more than one loaded project with same filename '{0}'", fullProjectPath));
            Microsoft.Build.Evaluation.Project buildProject = prjs.Count == 0 ? null : prjs[0];

            if (buildProject == null)
            {
                var lclGlobalProperties = (null == globalProperties) ? new Dictionary<string, string>() : new Dictionary<string, string>(globalProperties)
                {
                    { "FSharpCompilerPath", Path.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location), "Tools") }
                };
                buildProject = buildEngine.LoadProject(fullProjectPath, lclGlobalProperties, null);
                buildProject.IsBuildEnabled = true;
            }

            return buildProject;
        }

        /// <summary>
        /// Loads a project file for the file. If the build project exists and it was loaded with a different file then it is unloaded first. 
        /// </summary>
        /// <param name="buildEngine">The build engine to use to create a build project.</param>
        /// <param name="fullProjectPath">The full path of the project.</param>
        /// <param name="exitingBuildProject">An Existing build project that will be reloaded.</param>
        /// <returns>A loaded msbuild project.</returns>
        public static Microsoft.Build.Evaluation.Project ReinitializeMsBuildProject(Microsoft.Build.Evaluation.ProjectCollection buildEngine, string fullProjectPath, IDictionary<String,String> globalProperties, Microsoft.Build.Evaluation.Project exitingBuildProject)
        {
            // If we have a build project that has been loaded with another file unload it.
            try
            {
                if (exitingBuildProject != null && exitingBuildProject.ProjectCollection != null) // TODO && !NativeMethods.IsSamePath(exitingBuildProject.FullFileName, fullProjectPath))
                {
                    MSBuildProject.FullyUnloadProject(buildEngine, exitingBuildProject);
                }
            }
            // We  catch Invalid operation exception because if the project was unloaded while we touch the ParentEngine the msbuild API throws. 
            // Is there a way to figure out that a project was unloaded?
            catch (InvalidOperationException)
            {
            }

            return Utilities.InitializeMsBuildProject(buildEngine, fullProjectPath, globalProperties);
        }

        public static Microsoft.Build.Evaluation.ProjectCollection InitializeMsBuildEngine(Microsoft.Build.Evaluation.ProjectCollection existingEngine)
        {
            if (existingEngine == null)
            {
                Microsoft.Build.Evaluation.ProjectCollection buildEngine = Microsoft.Build.Evaluation.ProjectCollection.GlobalProjectCollection;
                return buildEngine;
            }

            return existingEngine;
        }

        /// <summary>
        /// Gets an instance of an EnumConverter for enums that have PropertyPageTypeConverter attribute
        /// </summary>
        /// <typeparam name="T">The type to search for the PropertyPageTypeConverter attribute.</typeparam>
        /// <returns>An instance of an enum converter, or null if none found.</returns>
        private static EnumConverter GetEnumConverter<T>()
            where T : struct
        {
            object[] attributes = typeof(T).GetCustomAttributes(typeof(PropertyPageTypeConverterAttribute), true);

            // There should be only one PropertyPageTypeConverterAttribute defined on T
            if (attributes != null && attributes.Length == 1)
            {

                Debug.Assert(attributes[0] is PropertyPageTypeConverterAttribute, "The returned attribute must be an attribute is PropertyPageTypeConverterAttribute");
                PropertyPageTypeConverterAttribute converterAttribute = (PropertyPageTypeConverterAttribute)attributes[0];

                if (converterAttribute.ConverterType.IsSubclassOf(typeof(EnumConverter)))
                {
                    return Activator.CreateInstance(converterAttribute.ConverterType) as EnumConverter;
                }
            }

            return null;
        }

        /// <summary>>
        /// Checks if the file name is all the given character.
        /// </summary>
        private static bool IsFileNameAllGivenCharacter(char c, string fileName)
        {
            // A valid file name cannot be all "c" .
            int charFound = 0;
            for (charFound = 0; charFound < fileName.Length && fileName[charFound] == c; ++charFound) ;
            if (charFound >= fileName.Length)
            {
                return true;
            }

            return false;
        }

        /// <summary>
        /// Checks whether a file part contains valid characters. The file part can be any part of a non rooted path.
        /// </summary>
        /// <param name="filePart"></param>
        /// <returns></returns>
        private static bool IsFilePartInValid(string filePart)
        {
            if (String.IsNullOrEmpty(filePart))
            {
                return true;
            }
            String reservedName = "(\\b(nul|con|aux|prn)\\b)|(\\b((com|lpt)[0-9])\\b)";
            String invalidChars = @"([/?:&\\*<>|#%" + '\"' + "])";
            String regexToUseForFileName = reservedName + "|" + invalidChars;
            String fileNameToVerify = filePart;

            // Define a regular expression that covers all characters that are not in the safe character sets.
            // It is compiled for performance.

            // The filePart might still be a file and extension. If it is like that then we must check them separately, since different rules apply
            string extension = String.Empty;
            try
            {
                extension = Path.GetExtension(filePart);
            }
            // We catch the ArgumentException because we want this method to return true if the filename is not valid. FilePart could be for example #�&%"�&"% and that would throw ArgumentException on GetExtension
            catch (ArgumentException)
            {
                return true;
            }

            if (!String.IsNullOrEmpty(extension))
            {
                // Check the extension first
                String regexToUseForExtension = invalidChars;
                Regex unsafeCharactersRegex = new Regex(regexToUseForExtension, RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.CultureInvariant);
                bool isMatch = unsafeCharactersRegex.IsMatch(extension);
                if (isMatch)
                {
                    return isMatch;
                }

                // We want to verify here everything but the extension.
                // We cannot use GetFileNameWithoutExtension because it might be that for example (..\\filename.txt) is passed in and that should fail, since that is not a valid filename.
                fileNameToVerify = filePart.Substring(0, filePart.Length - extension.Length);

                if (String.IsNullOrEmpty(fileNameToVerify))
                {
                    return true;
                }
            }

            // We verify CLOCK$ outside the regex since for some reason the regex is not matching the clock\\$ added.
            if (String.Compare(fileNameToVerify, "CLOCK$", StringComparison.OrdinalIgnoreCase) == 0)
            {
                return true;
            }

            Regex unsafeFileNameCharactersRegex = new Regex(regexToUseForFileName, RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.CultureInvariant);
            return unsafeFileNameCharactersRegex.IsMatch(fileNameToVerify);
        }

        /// <summary>
        /// Copy a directory recursively to the specified non-existing directory
        /// </summary>
        /// <param name="source">Directory to copy from</param>
        /// <param name="target">Directory to copy to</param>
        public static void RecursivelyCopyDirectory(string source, string target)
        {
            // Make sure it doesn't already exist
            if (Directory.Exists(target))
                throw new ApplicationException(String.Format(CultureInfo.CurrentCulture, SR.GetString(SR.FileOrFolderAlreadyExists, CultureInfo.CurrentUICulture), target));

            Directory.CreateDirectory(target);
            DirectoryInfo directory = new DirectoryInfo(source);

            // Copy files
            foreach (FileInfo file in directory.GetFiles())
            {
                file.CopyTo(Path.Combine(target, file.Name));
            }

            // Now recurse to child directories
            foreach (DirectoryInfo child in directory.GetDirectories())
            {
                RecursivelyCopyDirectory(child.FullName, Path.Combine(target, child.Name));
            }
        }

        /// <summary>
        /// Canonicalizes a file name, including:
        ///  - determines the full path to the file
        ///  - casts to upper case
        /// Canonicalizing a file name makes it possible to compare file names using simple string comparison.
        /// 
        /// Note: this method does not handle shared drives and UNC drives.
        /// </summary>
        /// <param name="anyFileName">A file name, which can be relative/absolute and contain lower-case/upper-case characters.</param>
        /// <returns>Canonicalized file name.</returns>
        public static string CanonicalizeFileName(string anyFileName)
        {
            // Get absolute path
            // Note: this will not handle UNC paths
            FileInfo fileInfo = new FileInfo(anyFileName);
            string fullPath = fileInfo.FullName;

            // Cast to upper-case
            fullPath = fullPath.ToUpper(CultureInfo.CurrentCulture);

            return fullPath;
        }

        /// <summary>
        /// Attempts a call to CanonicalizeFileName, but returns the input unchanged if that method throws
        /// </summary>
        /// <param name="anyFileName">File name to canonicalize</param>
        /// <returns>Canonicalized file name if possible, otherwise returns input unchanged</returns>
        public static string CanonicalizeFileNameNoThrow(string anyFileName)
        {
            try
            {
                return CanonicalizeFileName(anyFileName);
            }
            catch { }

            return anyFileName;
        }

        /// <summary>
        /// Determines if a file is a template.
        /// </summary>
        /// <param name="fileName">The file to check whether it is a template file</param>
        /// <returns>true if the file is a template file</returns>
        public static bool IsTemplateFile(string fileName)
        {
            if (String.IsNullOrEmpty(fileName))
            {
                return false;
            }

            string extension = Path.GetExtension(fileName);
            return (String.Compare(extension, ".vstemplate", StringComparison.OrdinalIgnoreCase) == 0 || string.Compare(extension, ".vsz", StringComparison.OrdinalIgnoreCase) == 0);
        }

        /// <summary>
        /// Retrieves the configuration and the platform using the IVsSolutionBuildManager2 interface.
        /// </summary>
        /// <param name="serviceProvider">A service provider.</param>
        /// <param name="hierarchy">The hierarchy whose configuration is requested.</param>
        /// <returns>true if successful.</returns>
        public static bool TryGetActiveConfigurationAndPlatform(System.IServiceProvider serviceProvider, Guid projectId, out ConfigCanonicalName configCanonicalName)
        {
            if (serviceProvider == null)
            {
                throw new ArgumentNullException("serviceProvider");
            }

            IVsSolutionBuildManager5 solutionBuildManager = serviceProvider.GetService(typeof(SVsSolutionBuildManager)) as IVsSolutionBuildManager5;

            if (solutionBuildManager == null)
            {
                configCanonicalName = new ConfigCanonicalName();
                return false;
            }

            string canonicalName;
            ErrorHandler.ThrowOnFailure(solutionBuildManager.FindActiveProjectCfgName(projectId, out canonicalName));

            configCanonicalName = new ConfigCanonicalName(canonicalName);

            return true;
        }

        /// <summary>
        /// Retrieves the configuration and the platform using the IVsSolutionBuildManager2 interface.
        /// </summary>
        /// <param name="serviceProvider">A service provider.</param>
        /// <param name="hierarchy">The hierarchy whose configuration is requested.</param>
        /// <returns>true if successful.</returns>
        public static bool TryGetConfigurationAndPlatform(IVsCfg config, out ConfigCanonicalName configCanonicalName)
        {

            string configName = null;
            config.get_DisplayName(out configName);

            if (configName == null)
            {
                configCanonicalName = new ConfigCanonicalName();
                return false;
            }

            configCanonicalName = new ConfigCanonicalName(configName);

            return true;
        }


        /// <summary>
        /// Determines whether the shell is in command line mode.
        /// </summary>
        /// <param name="serviceProvider">A reference to a Service Provider.</param>
        /// <returns>true if the shell is in command line mode. false otherwise.</returns>
        public static bool IsShellInCommandLineMode(System.IServiceProvider serviceProvider)
        {
            if (serviceProvider == null)
            {
                throw new ArgumentNullException("serviceProvider");
            }

            IVsShell shell = serviceProvider.GetService(typeof(SVsShell)) as IVsShell;
            if (shell == null)
            {
                throw new InvalidOperationException();
            }

            object isInCommandLineModeAsObject;
            ErrorHandler.ThrowOnFailure(shell.GetProperty((int)__VSSPROPID.VSSPROPID_IsInCommandLineMode, out isInCommandLineModeAsObject));

			return ((bool)isInCommandLineModeAsObject);
		}
	}


    /// <summary>
    /// Functions for dealing with key tokens like those found in assembly strong names:
    /// 
    ///     System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=x86
    ///     
    /// </summary>
    internal static class KeyToken
    {
        /// <summary>
        /// Convert a public key token into a string of hex digits.
        /// </summary>
        static public string ToHexString(byte[] publicKeyToken)
        {
            StringBuilder builder = new StringBuilder();
            for (int i = 0; i < publicKeyToken.Length; i++)
            {
                builder.AppendFormat("{0:x2}", publicKeyToken[i]);
            }
            return builder.ToString();
        }
    }
}
