// Copyright (C) 2002-2007 Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h

#include "CFileSystem.h"
#include "IReadFile.h"
#include "IWriteFile.h"
#include "CZipReader.h"
#include "CPakReader.h"
#include "CFileList.h"
#include "CXMLReader.h"
#include "CXMLWriter.h"
#include "stdio.h"
#include "os.h"
#include "IrrCompileConfig.h"
#include "CAttributes.h"
#include "CMemoryReadFile.h"

#ifdef _IRR_WINDOWS_API_
#include <direct.h> // for _chdir
#else
#include <unistd.h>
#include <limits.h>
#include <stdlib.h>
#endif

namespace irr
{
namespace io
{


//! constructor
CFileSystem::CFileSystem()
{
	#ifdef _DEBUG
	setDebugName("CFileSystem");
	#endif
}



//! destructor
CFileSystem::~CFileSystem()
{
	u32 i;

	for ( i=0; i<ZipFileSystems.size(); ++i)
		ZipFileSystems[i]->drop();

	for ( i=0; i<PakFileSystems.size(); ++i)
		PakFileSystems[i]->drop();

	for ( i= 0; i<UnZipFileSystems.size(); ++i)
		UnZipFileSystems[i]->drop();
}



//! opens a file for read access
IReadFile* CFileSystem::createAndOpenFile(const c8* filename)
{
	IReadFile* file = 0;
	u32 i;

	for ( i=0; i<ZipFileSystems.size(); ++i)
	{
		file = ZipFileSystems[i]->openFile(filename);
		if (file)
			return file;
	}

	for ( i = 0; i<PakFileSystems.size(); ++i)
	{
		file = PakFileSystems[i]->openFile(filename);
		if (file)
			return file;
	}

	for ( i = 0; i<UnZipFileSystems.size(); ++i)
	{
		file = UnZipFileSystems[i]->openFile(filename);
		if (file)
			return file;
	}

	file = createReadFile(filename);
	return file;
}

//! Creates an IReadFile interface for treating memory like a file.
IReadFile* CFileSystem::createMemoryReadFile(void* memory, s32 len, 
											const c8* fileName, bool deleteMemoryWhenDropped)
{
	if (!memory)
		return 0;
	else
		return new CMemoryReadFile(memory, len, fileName, deleteMemoryWhenDropped);
}

//! Opens a file for write access.
IWriteFile* CFileSystem::createAndWriteFile(const c8* filename, bool append)
{
	return createWriteFile(filename, append);
}


bool CFileSystem::addFolderFileArchive(const c8* filename, bool ignoreCase, bool ignorePaths)
{
	bool ret = false;

	CUnZipReader* zr = new CUnZipReader( this, filename, ignoreCase, ignorePaths);
	if (zr)
	{
		UnZipFileSystems.push_back(zr);
		ret = true;
	}

	#ifdef _DEBUG
	if ( false == ret )
	{
		os::Printer::log("Could not open file. UnZipfile not added", filename, ELL_ERROR);
	}
	#endif

	return ret;

}


//! adds an zip archive to the filesystem
bool CFileSystem::addZipFileArchive(const c8* filename, bool ignoreCase, bool ignorePaths)
{
	IReadFile* file = createReadFile(filename);
	if (file)
	{
		CZipReader* zr = new CZipReader(file, ignoreCase, ignorePaths);
		if (zr)
			ZipFileSystems.push_back(zr);

		file->drop();

		bool ret = (zr != 0);
		_IRR_IMPLEMENT_MANAGED_MARSHALLING_BUGFIX;
		return ret;
	}

	#ifdef _DEBUG
	os::Printer::log("Could not open file. Zipfile not added", filename, ELL_ERROR);
	#endif

	_IRR_IMPLEMENT_MANAGED_MARSHALLING_BUGFIX;
	return false;
}


//! adds an pak archive to the filesystem
bool CFileSystem::addPakFileArchive(const c8* filename, bool ignoreCase, bool ignorePaths)
{
	IReadFile* file = createReadFile(filename);
	if (file)
	{
		CPakReader* zr = new CPakReader(file, ignoreCase, ignorePaths);
		if (zr)
			PakFileSystems.push_back(zr);

		file->drop();

		bool ret = (zr != 0);
		_IRR_IMPLEMENT_MANAGED_MARSHALLING_BUGFIX;
		return ret;
	}

	#ifdef _DEBUG
	os::Printer::log("Could not open file. Pakfile not added", filename, ELL_ERROR);
	#endif

	_IRR_IMPLEMENT_MANAGED_MARSHALLING_BUGFIX;
	return false;
}


//! Returns the string of the current working directory
const c8* CFileSystem::getWorkingDirectory()
{
#ifdef _IRR_WINDOWS_API_
	_getcwd(WorkingDirectory, FILE_SYSTEM_MAX_PATH);
#endif

#if (defined(_IRR_POSIX_API_) || defined(MACOSX))
	getcwd(WorkingDirectory, (size_t)FILE_SYSTEM_MAX_PATH);
#endif
	return WorkingDirectory;
}


//! Changes the current Working Directory to the given string.
//! The string is operating system dependent. Under Windows it will look
//! like this: "drive:\directory\sudirectory\"
//! \return Returns true if successful, otherwise false.
bool CFileSystem::changeWorkingDirectoryTo(const c8* newDirectory)
{
	bool success=false;
#ifdef _MSC_VER
	success=(_chdir(newDirectory) == 0);
#else
	success=(chdir(newDirectory) == 0);
#endif
	return success;
}

irr::core::stringc CFileSystem::getAbsolutePath(irr::core::stringc &filename)
{
	c8 *p=0;
	irr::core::stringc ret;

#ifdef _IRR_WINDOWS_API_

	c8 fpath[_MAX_PATH];
	p = _fullpath( fpath, filename.c_str(), _MAX_PATH);
	ret = p;

#elif (defined(_IRR_POSIX_API_) || defined(MACOSX))

	c8 fpath[4096];
	p = realpath(filename.c_str(), fpath);
	ret = p;

#endif

	return ret;
}

irr::core::stringc CFileSystem::getFileDir(irr::core::stringc &filename)
{
	irr::core::stringc ret;
 
	// find last forward or backslash
	s32 lastSlash = filename.findLast('/');
	s32 lastBackSlash = filename.findLast('\\');
	lastSlash = lastSlash > lastBackSlash ? lastSlash : lastBackSlash;

	if (lastSlash >= 0 && lastSlash < (s32)filename.size())
		ret = filename.subString(0, lastSlash);
	else
		ret = ".";

	return ret;
}

//! Creates a list of files and directories in the current working directory 
IFileList* CFileSystem::createFileList()
{
	return new CFileList();
}


//! determines if a file exists and would be able to be opened.
bool CFileSystem::existFile(const c8* filename)
{
	u32 i;

	for (i=0; i<ZipFileSystems.size(); ++i)
		if (ZipFileSystems[i]->findFile(filename)!=-1)
			return true;

	for (i=0; i<PakFileSystems.size(); ++i)
		if (PakFileSystems[i]->findFile(filename)!=-1)
			return true;

	for (i=0; i<UnZipFileSystems.size(); ++i)
		if (UnZipFileSystems[i]->findFile(filename)!=-1)
			return true;

	FILE* f = fopen(filename, "rb");
	if (f) 
	{
		fclose(f);
		return true;
	}

	_IRR_IMPLEMENT_MANAGED_MARSHALLING_BUGFIX;
	return false;
}


//! Creates a XML Reader from a file.
IXMLReader* CFileSystem::createXMLReader(const c8* filename)
{
	IReadFile* file = createAndOpenFile(filename);
	if (!file)
		return 0;

	IXMLReader* reader = createXMLReader(file);
	file->drop();
	return reader;
}


//! Creates a XML Reader from a file.
IXMLReader* CFileSystem::createXMLReader(IReadFile* file)
{
	if (!file)
		return 0;

	return createIXMLReader(file);
}

//! Creates a XML Reader from a file.
IXMLReaderUTF8* CFileSystem::createXMLReaderUTF8(const c8* filename)
{
	IReadFile* file = createAndOpenFile(filename);
	if (!file)
		return 0;

	IXMLReaderUTF8* reader = createIXMLReaderUTF8(file);
	file->drop();
	return reader;
}

//! Creates a XML Reader from a file.
IXMLReaderUTF8* CFileSystem::createXMLReaderUTF8(IReadFile* file)
{
	if (!file)
		return 0;

	return createIXMLReaderUTF8(file);
}


//! Creates a XML Writer from a file.
IXMLWriter* CFileSystem::createXMLWriter(const c8* filename)
{
	IWriteFile* file = createAndWriteFile(filename);
	IXMLWriter* writer = createXMLWriter(file);
	file->drop();
	return writer;
}


//! Creates a XML Writer from a file.
IXMLWriter* CFileSystem::createXMLWriter(IWriteFile* file)
{
	return new CXMLWriter(file);
}


//! creates a filesystem which is able to open files from the ordinary file system,
//! and out of zipfiles, which are able to be added to the filesystem.
IFileSystem* createFileSystem()
{
	return new CFileSystem();
}

//! Creates a new empty collection of attributes, usable for serialization and more.
IAttributes* CFileSystem::createEmptyAttributes(video::IVideoDriver* driver)
{
	return new CAttributes(driver);
}

} // end namespace irr
} // end namespace io