// ==++==
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--==
//============================================================
//
// Class:  DirectoryInfo
//
// Purpose: Exposes routines for enumerating through a
// directory.
//
//===========================================================  

using System;
using System.Collections;
using System.Diagnostics;
using Microsoft.Singularity;
using System.Text;
using System.Runtime.InteropServices;
using System.Globalization;

//@TODO: Add a static SystemDirectoryInfo property returning a URI
namespace System.IO
{
    //| <include file='doc\DirectoryInfo.uex' path='docs/doc[@for="DirectoryInfo"]/*' />
    public sealed class DirectoryInfo : FileSystemInfo {
        private DirectoryInfo() {
        }


        //| <include file='doc\DirectoryInfo.uex' path='docs/doc[@for="DirectoryInfo.DirectoryInfo"]/*' />
        public DirectoryInfo(String path)
        {
            if (path == null)
                throw new ArgumentNullException("path");

            OriginalPath = path;

            // Must fully qualify the path for the security check
            String fullPath = Path.GetFullPathInternal(path);
            FullPath = fullPath;

        }

        internal DirectoryInfo(String! fullPath, bool junk)
        {
            Debug.Assert(Path.GetRootLength(fullPath) > 0, "fullPath must be fully qualified!");
            // Fast path when we know a DirectoryInfo exists.
            OriginalPath = Path.GetFileName(fullPath);
            FullPath = fullPath;
        }

        //| <include file='doc\DirectoryInfo.uex' path='docs/doc[@for="DirectoryInfo.Name"]/*' />
        public override String Name {
            get {
                // FullPath might be either "c:\bar" or "c:\bar\".  Handle
                // those cases, as well as avoiding mangling "c:\".
                String s = FullPath;
                if (s.Length > 3) {
                    if (s.EndsWith(Path.DirectorySeparatorChar))
                        s = FullPath.Substring(0, FullPath.Length - 1);
                    return Path.GetFileName(s);
                }
                return FullPath;  // For rooted paths, like "c:\"
            }
        }

        //| <include file='doc\DirectoryInfo.uex' path='docs/doc[@for="DirectoryInfo.Parent"]/*' />
        public DirectoryInfo Parent {
            get {
                String parentName;
                // FullPath might be either "c:\bar" or "c:\bar\".  Handle
                // those cases, as well as avoiding mangling "c:\".
                String s = FullPath;
                if (s.Length > 3 && s.EndsWith(Path.DirectorySeparatorChar))
                    s = FullPath.Substring(0, FullPath.Length - 1);
                parentName = Path.GetDirectoryName(s);
                if (parentName == null)
                    return null;
                DirectoryInfo dir = new DirectoryInfo(parentName,false);
                return dir;
            }
        }



        //| <include file='doc\DirectoryInfo.uex' path='docs/doc[@for="DirectoryInfo.CreateSubdirectory"]/*' />
        public DirectoryInfo CreateSubdirectory(String path) {
            if (path == null)
                throw new ArgumentNullException("path");

            String newDirs = Path.InternalCombine(FullPath, path);
            String fullPath = Path.GetFullPathInternal(newDirs);

            if (0 != String.Compare(FullPath,0,fullPath,0, FullPath.Length,true))
                throw new ArgumentException(String.Format("Argument_InvalidSubPath",path,OriginalPath));

            Directory.InternalCreateDirectory(fullPath,path);
            return new DirectoryInfo(fullPath, false);
        }

        //| <include file='doc\DirectoryInfo.uex' path='docs/doc[@for="DirectoryInfo.Create"]/*' />
        public void Create()
        {
            Directory.InternalCreateDirectory(FullPath,OriginalPath);
        }

        // Tests if the given path refers to an existing DirectoryInfo on disk.
        //
        // Your application must have Read permission to the directory's
        // contents.
        //
        //| <include file='doc\DirectoryInfo.uex' path='docs/doc[@for="DirectoryInfo.Exists"]/*' />
        public override bool Exists {
            get
            {
                try {
                    if (_dataInitialised == -1)
                        Refresh();
                    if (_dataInitialised != 0) // Refresh was unable to initialise the data
                        return false;

                    return _data.fileAttributes != -1 && (_data.fileAttributes & Native.FILE_ATTRIBUTE_DIRECTORY) != 0;
                }
                catch (Exception) {
                    return false;
                }
            }
        }




        // Returns an array of Files in the current DirectoryInfo matching the
        // given search criteria (ie, "*.txt").
        //| <include file='doc\DirectoryInfo.uex' path='docs/doc[@for="DirectoryInfo.GetFiles"]/*' />
        public FileInfo[] GetFiles(String searchPattern)
        {
            if (searchPattern == null)
                throw new ArgumentNullException("searchPattern");

            searchPattern = searchPattern.TrimEnd();
            if (searchPattern.Length == 0)
                return new FileInfo[0];

            String path = FullPath;

            String searchPath = Path.GetDirectoryName(searchPattern);

            if (searchPath != null && searchPath != String.Empty) // For filters like foo\*.cs we need to verify if the directory foo is not denied access.
            {
                path = Path.Combine(path,searchPath);
            }

            String[] fileNames = Directory.InternalGetFiles(FullPath, OriginalPath, searchPattern);
            for (int i = 0; i < fileNames.Length; i++)
                fileNames[i] = Path.InternalCombine(path, fileNames[i]);
            FileInfo[] files = new FileInfo[fileNames.Length];
            for (int i = 0; i < fileNames.Length; i++)
                files[i] = new FileInfo((!)fileNames[i], false);
            return files;
        }



       // Returns an array of Files in the DirectoryInfo specified by path
        //| <include file='doc\DirectoryInfo.uex' path='docs/doc[@for="DirectoryInfo.GetFiles1"]/*' />
        public FileInfo[] GetFiles()
        {
            return GetFiles("*");
        }




        // Returns an array of Directories in the current directory.
        //| <include file='doc\DirectoryInfo.uex' path='docs/doc[@for="DirectoryInfo.GetDirectories"]/*' />
        public DirectoryInfo[] GetDirectories()
        {
            return GetDirectories("*");
        }






        // Returns an array of strongly typed FileSystemInfo entries in the path with the
        // given search criteria (ie, "*.txt").
        //| <include file='doc\DirectoryInfo.uex' path='docs/doc[@for="DirectoryInfo.GetFileSystemInfos"]/*' />
        public FileSystemInfo[] GetFileSystemInfos(String searchPattern)
        {
            if (searchPattern == null)
                throw new ArgumentNullException("searchPattern");

            searchPattern = searchPattern.TrimEnd();
            if (searchPattern.Length == 0)
                return new FileSystemInfo[0];

            String path = FullPath;

            String searchPath = Path.GetDirectoryName(searchPattern);
            if (searchPath != null && searchPath != String.Empty) // For filters like foo\*.cs we need to verify if the directory foo is not denied access.
            {
                path = Path.Combine(path,searchPath);
            }

            String [] dirNames = Directory.InternalGetDirectories(FullPath, OriginalPath, searchPattern);
            String [] fileNames = Directory.InternalGetFiles(FullPath, OriginalPath, searchPattern);
            FileSystemInfo [] fileSystemEntries = new FileSystemInfo[dirNames.Length + fileNames.Length];
            String[] permissionNames = new String[dirNames.Length];

            for (int i = 0; i < dirNames.Length; i++) {
                dirNames[i] = Path.InternalCombine(path, dirNames[i]);
                permissionNames[i] = dirNames[i] +  "\\.";
            }

            for (int i = 0; i < fileNames.Length; i++)
                fileNames[i] = Path.InternalCombine(path, fileNames[i]);

            int count = 0;
            for (int i = 0; i < dirNames.Length; i++)
                fileSystemEntries[count++] = new DirectoryInfo((!)dirNames[i], false);

            for (int i = 0; i < fileNames.Length; i++)
                fileSystemEntries[count++] = new FileInfo((!)fileNames[i], false);

            return fileSystemEntries;
        }



        // Returns an array of strongly typed FileSystemInfo entries which will contain a listing
        // of all the files and directories.
        //| <include file='doc\DirectoryInfo.uex' path='docs/doc[@for="DirectoryInfo.GetFileSystemInfos1"]/*' />
        public FileSystemInfo[] GetFileSystemInfos()
        {
           return GetFileSystemInfos("*");
        }

        // Returns an array of Directories in the current DirectoryInfo matching the
        // given search criteria (ie, "System*" could match the System & System32
        // directories).
        //| <include file='doc\DirectoryInfo.uex' path='docs/doc[@for="DirectoryInfo.GetDirectories1"]/*' />
        public DirectoryInfo[] GetDirectories(String searchPattern)
        {
            if (searchPattern == null)
                throw new ArgumentNullException("searchPattern");

            searchPattern = searchPattern.TrimEnd();
            if (searchPattern.Length == 0)
                return new DirectoryInfo[0];

            String path = FullPath;

            String searchPath = Path.GetDirectoryName(searchPattern);
            if (searchPath != null && searchPath != String.Empty) // For filters like foo\*.cs we need to verify if the directory foo is not denied access.
            {
                path = Path.Combine(path,searchPath);
            }

            String fullPath = Path.InternalCombine(FullPath, searchPattern);

            String[] dirNames = Directory.InternalGetFileDirectoryNames(fullPath, OriginalPath, false);
            String[] permissionNames = new String[dirNames.Length];
            for (int i = 0; i < dirNames.Length; i++) {
                dirNames[i] = Path.InternalCombine(path, dirNames[i]);
                permissionNames[i] = dirNames[i] + "\\."; // these will never have a slash at end
            }
            DirectoryInfo[] dirs = new DirectoryInfo[dirNames.Length];
            for (int i = 0; i < dirNames.Length; i++)
                dirs[i] = new DirectoryInfo((!)dirNames[i], false);
            return dirs;
        }





        // Returns the root portion of the given path. The resulting string
        // consists of those rightmost characters of the path that constitute the
        // root of the path. Possible patterns for the resulting string are: An
        // empty string (a relative path on the current drive), "\" (an absolute
        // path on the current drive), "X:" (a relative path on a given drive,
        // where X is the drive letter), "X:\" (an absolute path on a given drive),
        // and "\\server\share" (a UNC path for a given server and share name).
        // The resulting string is null if path is null.
        //

        //| <include file='doc\DirectoryInfo.uex' path='docs/doc[@for="DirectoryInfo.Root"]/*' />
        public DirectoryInfo Root {
            get
            {
                int rootLength = Path.GetRootLength(FullPath);
                String rootPath = FullPath.Substring(0, rootLength);
                return new DirectoryInfo(rootPath);
            }
        }


        //| <include file='doc\DirectoryInfo.uex' path='docs/doc[@for="DirectoryInfo.MoveTo"]/*' />
        public void MoveTo(String destDirName) {
            if (destDirName == null)
                throw new ArgumentNullException("destDirName");
            if (destDirName.Length == 0)
                throw new ArgumentException("Argument_EmptyFileName", "destDirName");

            String fullDestDirName = Path.GetFullPathInternal(destDirName);
            if (!fullDestDirName.EndsWith('\\'))
                fullDestDirName = fullDestDirName + "\\";

            String fullSourcePath;
            if (FullPath.EndsWith('\\'))
                fullSourcePath = FullPath;
            else
                fullSourcePath = FullPath + "\\";

            if (CompareInfo.Compare(fullSourcePath, fullDestDirName, CompareOptions.IgnoreCase) == 0)
                throw new IOException("IO.IO_SourceDestMustBeDifferent");

            String sourceRoot = Path.GetPathRoot(fullSourcePath);
            String destinationRoot = Path.GetPathRoot(fullDestDirName);

            if (CompareInfo.Compare(sourceRoot, destinationRoot, CompareOptions.IgnoreCase) != 0)
                throw new IOException("IO.IO_SourceDestMustHaveSameRoot");

            if (!Native.MoveFile(FullPath, destDirName)) {
                __Error.WinIOError(Native.ERROR_PATH_NOT_FOUND, OriginalPath);
            }
            FullPath = fullDestDirName;
            OriginalPath = destDirName;

            // Flush any cached information about the directory.
            _dataInitialised = -1;
        }


        //| <include file='doc\DirectoryInfo.uex' path='docs/doc[@for="DirectoryInfo.Delete"]/*' />
        public override void Delete()
        {
            Directory.Delete(FullPath, OriginalPath, false);
        }

        //| <include file='doc\DirectoryInfo.uex' path='docs/doc[@for="DirectoryInfo.Delete1"]/*' />
        public void Delete(bool recursive)
        {
            Directory.Delete(FullPath, OriginalPath, recursive);
        }





        // Returns the fully qualified path
        //| <include file='doc\DirectoryInfo.uex' path='docs/doc[@for="DirectoryInfo.ToString"]/*' />
#if false
        public override String ToString()
        {
            return OriginalPath;
        }
#endif


        // Constants defined in WINBASE.H
        private const int GetFileExInfoStandard = 0;

        // Defined in WinError.h
        private const int ERROR_SUCCESS = 0;
    }

}