/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011 Cyan Worlds, Inc.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.

Additional permissions under GNU GPL version 3 section 7

If you modify this Program, or any covered work, by linking or
combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK,
NVIDIA PhysX SDK, Microsoft DirectX SDK, OpenSSL library, Independent
JPEG Group JPEG library, Microsoft Windows Media SDK, or Apple QuickTime SDK
(or a modified version of those libraries),
containing parts covered by the terms of the Bink SDK EULA, 3ds Max EULA,
PhysX SDK EULA, DirectX SDK EULA, OpenSSL and SSLeay licenses, IJG
JPEG Library README, Windows Media SDK EULA, or QuickTime SDK EULA, the
licensors of this Program grant you additional
permission to convey the resulting work. Corresponding Source for a
non-source form of such a combination shall include the source code for
the parts of OpenSSL and IJG JPEG Library used as well as that of the covered
work.

You can contact Cyan Worlds, Inc. by email legal@cyan.com
 or by snail mail at:
      Cyan Worlds, Inc.
      14617 N Newport Hwy
      Mead, WA   99021

*==LICENSE==*/
/////////////////////////////////////////////////////////////////////////////
//
//	plFileUtils - Namespace of fun file utilities
//
//// History /////////////////////////////////////////////////////////////////
//
//	5.7.2002 mcn	- Created
//	4.8.2003 chip	- added FileCopy and FileMove for Unix
//
//////////////////////////////////////////////////////////////////////////////

#include "hsTypes.h"
#include "hsStlUtils.h"
#include "plFileUtils.h"
#include "hsFiles.h"
#include "hsStringTokenizer.h"
#include "hsWindows.h"

#include "plUnifiedTime/plUnifiedTime.h"

#include "plSecureStream.h" // for the default key

#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>


#if HS_BUILD_FOR_WIN32
#include <direct.h>
#include <io.h>
#endif

#if HS_BUILD_FOR_UNIX
#include <unistd.h>
#include <utime.h>
#endif


//// CreateDir ///////////////////////////////////////////////////////////////
//	Creates the directory specified. Returns false if unsuccessful or 
//	directory already exists

hsBool	plFileUtils::CreateDir( const char *path )
{
	// Create our directory
#if HS_BUILD_FOR_WIN32
	return ( mkdir( path ) == 0 ) ? true : ( errno==EEXIST );
#elif HS_BUILD_FOR_UNIX
	return ( mkdir( path, 0777 ) == 0 ) ? true : ( errno==EEXIST );
#endif
}

hsBool	plFileUtils::CreateDir( const wchar *path )
{
	// Create our directory
#if HS_BUILD_FOR_WIN32
	return ( _wmkdir( path ) == 0 ) ? true : ( errno==EEXIST );
#elif HS_BUILD_FOR_UNIX
	return ( mkdir( path, 0777 ) == 0 ) ? true : ( errno==EEXIST );
#endif
}

hsBool plFileUtils::RemoveDir(const char* path)
{
	return (rmdir(path) == 0);
}

hsBool plFileUtils::RemoveDirTree(const char * path)
{
	hsFolderIterator it(path);
	while (it.NextFile())
	{
		const char * fname = it.GetFileName();
		if ( fname[0]=='.' )
			continue;
		char pathAndName[128];
		it.GetPathAndName(pathAndName);
		if ( it.IsDirectory() )
		{
			RemoveDirTree( pathAndName );
			RemoveDir( pathAndName );
		}
		else
		{
			RemoveFile( pathAndName );
		}
	}
	RemoveDir( path );

	return 1;
}

//// RemoveFile ////////////////////////////////////////////////////////////

bool plFileUtils::RemoveFile(const char* filename, bool delReadOnly)
{
	if (delReadOnly)
		chmod(filename, S_IWRITE);
	return (unlink(filename) == 0);
}

bool plFileUtils::RemoveFile(const wchar* filename, bool delReadOnly)
{
	if (delReadOnly)
		_wchmod(filename, S_IWRITE);
	return (_wunlink(filename) == 0);
}

bool plFileUtils::FileCopy(const char* existingFile, const char* newFile)
{
	wchar* wExisting = hsStringToWString(existingFile);
	wchar* wNew = hsStringToWString(newFile);
	bool ret = FileCopy(wExisting, wNew);
	delete [] wExisting;
	delete [] wNew;
	return ret;
}

bool plFileUtils::FileCopy(const wchar* existingFile, const wchar* newFile)
{
#if HS_BUILD_FOR_WIN32
	return (::CopyFileW(existingFile, newFile, FALSE) != 0);
#elif HS_BUILD_FOR_UNIX
	char data[1500];
	FILE* fp = fopen(existingFile, "rb");
	FILE* fw = fopen(newFile, "w");
	int num = 0;
	bool retVal =  true;
	if (fp && fw){
		while(!feof(fp)){
			num = fread(data, sizeof( char ), 1500, fp);
			if( ferror( fp ) ) {
				retVal = false;
				break;
			}
			fwrite(data, sizeof( char ), num, fw);
		}
		fclose(fp);
		fclose(fw);
	} else {
		retVal = false;
	}
	return retVal;
#else
	hsAssert(0, "Not implemented");
	return false;
#endif
}

bool plFileUtils::FileMove(const char* existingFile, const char* newFile)
{
#if HS_BUILD_FOR_WIN32
	return (::MoveFile(existingFile, newFile) != 0);
#elif HS_BUILD_FOR_UNIX
	FileCopy(existingFile,newFile);
	return( RemoveFile( existingFile )==0);
#else
	hsAssert(0, "Not implemented");
	return false;
#endif
}

bool plFileUtils::FileMove(const wchar* existingFile, const wchar* newFile)
{
#if HS_BUILD_FOR_WIN32
	return (::MoveFileW(existingFile, newFile) != 0);
#elif HS_BUILD_FOR_UNIX
	FileCopy(existingFile,newFile);
	return( RemoveFile( existingFile )==0);
#else
	hsAssert(0, "Not implemented");
	return false;
#endif
}

bool plFileUtils::FileExists(const wchar* file)
{
	FILE* fp = _wfopen(file, L"rb");
	bool retVal = (fp != nil);
	if (fp)
		fclose(fp);
	return retVal;
}

bool plFileUtils::FileExists(const char* file)
{
	FILE* fp = fopen(file, "rb");
	bool retVal = (fp != nil);
	if (fp)
		fclose(fp);
	return retVal;
}

//// EnsureFilePathExists ////////////////////////////////////////////////////
//	Given a filename with path, makes sure the file's path exists

hsBool	plFileUtils::EnsureFilePathExists( const char *filename )
{
	wchar* wFilename = hsStringToWString(filename);
	hsBool ret = EnsureFilePathExists(wFilename);
	delete [] wFilename;
	return ret;
}

hsBool	plFileUtils::EnsureFilePathExists( const wchar *filename )
{
	hsWStringTokenizer	izer( filename, L"\\/" );

	hsBool	lastWorked = false;
	wchar	token[ kFolderIterator_MaxPath ];


	while( izer.Next( token, arrsize( token ) ) && izer.HasMoreTokens() )
	{
		// Want the full path from the start of the string
		lastWorked = CreateDir( izer.fString );
		izer.RestoreLastTerminator();
	}

	return lastWorked;
}

//// GetFileTimes ////////////////////////////////////////////////////////////
//	Gets the creation and modification dates of the file specified. Returns 
//	false if unsuccessful

hsBool	plFileUtils::GetFileTimes( const char *path, plUnifiedTime *createTimeOut, plUnifiedTime *modifyTimeOut )
{
	struct stat	fileInfo;

	int result = stat( path, &fileInfo );
	if( result != 0 )
		return false;

	if( createTimeOut != nil )
		*createTimeOut = plUnifiedTime( fileInfo.st_ctime );
	if( modifyTimeOut != nil )
		*modifyTimeOut = plUnifiedTime( fileInfo.st_mtime );

	return true;
}

plFileUtils::Modify plFileUtils::CompareModifyTimes(const char* file1, const char* file2)
{
	plUnifiedTime modTime1, modTime2;
	if (GetFileTimes(file1, nil, &modTime1) &&
		GetFileTimes(file2, nil, &modTime2))
	{
		double diff = plUnifiedTime::GetTimeDifference(modTime1, modTime2);

		if (hsABS(diff) <= 2)
			return kFilesEqual;
		else if (diff > 0)
			return kFile1Newer;
		else
			return kFile2Newer;
	}

	return kFileError;
}

bool plFileUtils::SetModifyTime( const char * filename, const plUnifiedTime & timestamp )
{
#ifdef HS_BUILD_FOR_WIN32
	HANDLE hFile = CreateFile(filename,
		GENERIC_WRITE,FILE_SHARE_READ|FILE_SHARE_WRITE,
		nil,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,nil);
	if (hFile==INVALID_HANDLE_VALUE)
		return false;
	SYSTEMTIME systime;
	systime.wDay = timestamp.GetDay();
	systime.wDayOfWeek = timestamp.GetDayOfWeek();
	systime.wHour = timestamp.GetHour();
	systime.wMilliseconds = 0;
	systime.wMinute = timestamp.GetMinute();
	systime.wMonth = timestamp.GetMonth();
	systime.wSecond = timestamp.GetSecond();
	systime.wYear = timestamp.GetYear();
	FILETIME localFileTime, filetime;
	SystemTimeToFileTime(&systime,&localFileTime);
	LocalFileTimeToFileTime(&localFileTime,&filetime);
	SetFileTime(hFile,nil,nil,&filetime);
	CloseHandle(hFile);
	return true;

#elif HS_BUILD_FOR_UNIX
	struct stat	sbuf;
	int result = stat( filename, &sbuf );
	if( result )
		return false;
	struct utimbuf utb;
	utb.actime = sbuf.st_atime;
	utb.modtime = timestamp.GetSecs();
	result = utime( filename, &utb );
	if( result )
		return false;
	return true;

#endif
}

//// StripPath ///////////////////////////////////////////////////////////////

const char* plFileUtils::GetFileName(const char* path)
{
	const char* c = strrchr(path, '/');
	if (c == nil)
		c = strrchr(path, '\\');

	if (c == nil)
		c = path;
	else
		c++;

	return c;
}

const wchar* plFileUtils::GetFileName(const wchar* path)
{
	const wchar* c = wcsrchr(path, L'/');
	if (c == nil)
		c = wcsrchr(path, L'\\');

	if (c == nil)
		c = path;
	else
		c++;

	return c;
}

void plFileUtils::StripFile(char* pathAndName)
{
	char* fileName = (char*)GetFileName(pathAndName);
	if (fileName != pathAndName)
		*fileName = '\0';
}

void plFileUtils::StripFile(wchar* pathAndName)
{
	wchar* fileName = (wchar*)GetFileName(pathAndName);
	if (fileName != pathAndName)
		*fileName = L'\0';
}

void plFileUtils::StripExt(char* fileName)
{
	char* ext = (char*)GetFileExt(fileName);
	if (ext)
		*(ext-1) = '\0';
}

const char* plFileUtils::GetFileExt(const char* pathAndName)
{
	const char* fileName = GetFileName(pathAndName);
	if (fileName)
	{
		const char* ext = strrchr(fileName, '.');
		if (ext)
			return ext+1;
	}

	return nil;
}

const wchar* plFileUtils::GetFileExt(const wchar* pathAndName)
{
	const wchar* fileName = GetFileName(pathAndName);
	if (fileName)
	{
		const wchar* ext = wcsrchr(fileName, L'.');
		if (ext)
			return ext+1;
	}

	return nil;
}

void plFileUtils::AddSlash(char* path)
{
	char lastChar = path[strlen(path)-1];
	if (lastChar != '\\' && lastChar != '/')
		strcat(path, "\\");
}

void plFileUtils::ConcatFileName(char* path, const char* fileName)
{
	AddSlash(path);
	strcat(path, fileName);
}

//// GetFileSize /////////////////////////////////////////////////////////////

UInt32	plFileUtils::GetFileSize( const char *path )
{
	wchar* wPath = hsStringToWString(path);
	UInt32 ret = GetFileSize(wPath);
	delete [] wPath;
	return ret;
}

UInt32	plFileUtils::GetFileSize( const wchar *path )
{
	UInt32 len = 0;

	hsUNIXStream str;
	if (str.Open(path, L"rb"))
	{
		len = str.GetEOF();
		str.Close();
	}

	return len;
}

//// GetSecureEncryptionKey //////////////////////////////////////////////////

bool plFileUtils::GetSecureEncryptionKey(const char* filename, UInt32* key, unsigned length)
{
	wchar* wFilename = hsStringToWString(filename);
	bool ret = GetSecureEncryptionKey(wFilename, key, length);
	delete [] wFilename;
	return ret;
}

bool plFileUtils::GetSecureEncryptionKey(const wchar* filename, UInt32* key, unsigned length)
{
	// looks for an encryption key file in the same directory, and reads it
	std::wstring sFilename = filename;

	// grab parent directory
	unsigned loc = sFilename.rfind(L"\\");
	if (loc == std::wstring::npos)
		loc = sFilename.rfind(L"/");

	std::wstring sDir;
	if (loc != std::wstring::npos)
		sDir = sFilename.substr(0, loc);
	else // no directory
		sDir = L"./";
	if ((sDir[sDir.length()-1] != L'/') && (sDir[sDir.length()-1] != L'\\'))
		sDir += L'/'; // add the slash, if it doesn't has one

	// now add the key filename
	std::wstring keyFile = sDir + kWKeyFilename;

	if (FileExists(keyFile.c_str()))
	{
		// file exists, read from it
		hsUNIXStream file;
		file.Open(keyFile.c_str(), L"rb");

		unsigned bytesToRead = length * sizeof(UInt32);
		byte* buffer = (byte*)ALLOC(bytesToRead);
		unsigned bytesRead = file.Read(bytesToRead, buffer);

		file.Close();

		unsigned memSize = min(bytesToRead, bytesRead);
		memcpy(key, buffer, memSize);
		FREE(buffer);

		return true;
	}
	else
	{
		// file doesn't exist, use default key
		unsigned memSize = min(length, arrsize(plSecureStream::kDefaultKey));
		memSize *= sizeof(UInt32);
		memcpy(key, plSecureStream::kDefaultKey, memSize);

		return false;
	}
}