file-system.h
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file-system.h
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	#ifndef _paintown_file_system_h
	#define _paintown_file_system_h

	#include "exceptions/exception.h"
	#include "pointer.h"
	#include "thread.h"
	#include <string>
	#include <sstream>
	#include <vector>
	#include <map>
	#include <fstream>
	#include <stdint.h>

	struct stat;
	/* path utilities */
	namespace Path{
	class Path{
	public:
	const std::string & path() const;
	const std::string getExtension() const;
	bool isEmpty() const;

	virtual ~Path();

	protected:
	Path();
	Path(const std::string & path);
	Path(const Path & path);

	virtual inline void setPath(const std::string & s){
	mypath = s;
	}

	std::string mypath;
	};

	class InsensitivePath: public Path {
	public:
	InsensitivePath(const Path & what);
	bool operator==(const Path & path) const;
	};

	/* relative path should not have the leading data directory on it, just
	* the path within the paintown system.
	*/
	class RelativePath: public Path {
	public:
	explicit RelativePath();
	explicit RelativePath(const std::string & path);
	RelativePath(const RelativePath & path);

	bool operator<(const RelativePath & path) const;

	virtual RelativePath getDirectory() const;
	virtual RelativePath getFilename() const;

	RelativePath removeFirstDirectory() const;
	RelativePath firstDirectory() const;

	/* true if there are no directory parts to this path
	* foo is a file
	* bar/foo is not a file
	*/
	bool isFile() const;

	/* a/ + b/ = a/b/ */
	RelativePath join(const RelativePath & path) const;
	RelativePath & operator=(const RelativePath & copy);

	bool operator==(const RelativePath & path) const;
	bool operator!=(const RelativePath & path) const;
	};

	/* absolute paths should have the entire filesystem path on it */
	class AbsolutePath: public Path {
	public:
	explicit AbsolutePath();
	explicit AbsolutePath(const std::string & path);
	AbsolutePath(const AbsolutePath & path);
	AbsolutePath & operator=(const AbsolutePath & copy);

	bool operator<(const AbsolutePath & path) const;
	bool operator==(const AbsolutePath & path) const;
	bool operator!=(const AbsolutePath & path) const;

	/* Remove a given path from the start of this path */
	virtual RelativePath remove(const AbsolutePath & path) const;

	virtual AbsolutePath getDirectory() const;
	virtual AbsolutePath getFilename() const;

	AbsolutePath removeFirstDirectory() const;
	std::string firstDirectory() const;
	bool isFile() const;

	/* If the filename is empty then get the name of the directory.
	* a/b -> b
	* a/b/ -> b
	*
	* Otherwise (a/b/).getFilename() will be ""
	*/
	virtual std::string getLastComponent() const;

	AbsolutePath join(const RelativePath & path) const;
	};

	std::string invertSlashes(std::string str);
	std::string sanitize(std::string path);

	/* remove extension. foo.txt -> foo */
	std::string removeExtension(const std::string & str);

	/* basename, just get the filename and remove the directory part */
	std::string stripDir(const std::string & str);

	/* dirname, just get the directory and remove the filename part */
	std::string stripFilename(const std::string & str);
	}

	namespace Storage{
	/* sorry for the crappy abbreviation, but can't collide with the
	* Exception class here
	*/
	namespace Exc = ::Exception;

	class Exception: public Exc::Base {
	public:
	Exception(const std::string & where, int line, const std::string & file);
	Exception(const std::string & where, int line, const Exc::Base & nested, const std::string & file);
	Exception(const Exception & copy);
	virtual ~Exception() throw ();
	virtual void throwSelf() const {
	throw *this;
	}

	protected:
	virtual const std::string getReason() const;

	virtual Exc::Base * copy() const {
	return new Exception(*this);
	}

	private:
	std::string reason;
	};

	class NotFound: public Exception {
	public:
	NotFound(const std::string & where, int line, const std::string & file);
	NotFound(const std::string & where, int line, const Exc::Base & nested, const std::string & file);
	virtual ~NotFound() throw();
	NotFound(const NotFound & copy);
	virtual void throwSelf() const {
	throw *this;
	}
	protected:
	virtual Exc::Base * copy() const {
	return new NotFound(*this);
	}
	};

	class IllegalPath: public Exception {
	public:
	IllegalPath(const std::string & where, int line, const std::string & file);
	IllegalPath(const std::string & where, int line, const Exc::Base & nested, const std::string & file);
	virtual ~IllegalPath() throw();
	IllegalPath(const IllegalPath & copy);
	virtual void throwSelf() const {
	throw *this;
	}
	protected:
	virtual Exc::Base * copy() const {
	return new IllegalPath(*this);
	}
	};

	class Eof: public std::exception {
	public:
	Eof(){
	}

	virtual ~Eof() throw (){
	}
	};

	class EndianReader{
	public:
	EndianReader(std::ifstream & stream):
	stream(stream){
	}

	virtual ~EndianReader(){
	}

	virtual int8_t readByte1(){
	return convert(readBytes(sizeof(int8_t)));
	}

	virtual int16_t readByte2(){
	return convert(readBytes(sizeof(int16_t)));
	}

	virtual int32_t readByte4(){
	return convert(readBytes(sizeof(int32_t)));
	}

	virtual std::string readStringX(int length);
	virtual std::string readString2(int length);
	virtual void readBytes(uint8_t * out, int length);

	virtual void seekEnd(std::streamoff where);
	virtual void seek(std::streampos where);

	virtual int position();

	protected:
	virtual int32_t convert(const std::vector<uint8_t> & bytes) = 0;

	std::vector<uint8_t> readBytes(int length);

	std::ifstream & stream;
	};

	/* combines bytes b0 b1 b2 b3 as b0 + b12^8 + b22^16 + b32^24 /
	class LittleEndianReader: public EndianReader {
	public:
	LittleEndianReader(std::ifstream & stream):
	EndianReader(stream){
	}
	protected:
	virtual int32_t convert(const std::vector<uint8_t> & bytes){
	uint32_t out = 0;
	for (std::vector<uint8_t>::const_reverse_iterator it = bytes.rbegin(); it != bytes.rend(); it++){
	out = (out << 8) + *it;
	}
	return out;
	}
	};

	/* combines bytes b0 b1 b2 b3 as b02^24 + b12^16 + b22^8 + b3 /
	class BigEndianReader: public EndianReader {
	public:
	BigEndianReader(std::ifstream & stream):
	EndianReader(stream){
	}
	protected:
	virtual int32_t convert(const std::vector<uint8_t> & bytes){
	uint32_t out = 0;
	for (std::vector<uint8_t>::const_iterator it = bytes.begin(); it != bytes.end(); it++){
	out = (out << 8) + *it;
	}
	return out;
	}
	};

	/* Abstraction for files. Should be used instead of FILE, ifstream, SDL_RWOps, anything else */
	class File{
	public:
	enum Access{
	Read,
	Write,
	ReadWrite
	};

	File();
	virtual ~File();

	/* Returns the number of bytes read */
	virtual int readLine(char * output, int size) = 0;

	/* true if the underlying object can be streamed. generally
	* this should be true if the object can be kept around for a while.
	* zip files aren't streamable because only one zip entry can be
	* open at a time so it must be closed as soon as possible.
	*/
	virtual bool canStream() = 0;

	/* seek to an absolute position */
	virtual void seek(int position) = 0;

	virtual int getSize() = 0;

	/* if the file is at eof and can't read anymore */
	virtual bool eof() = 0;

	/* if the file can still be read */
	virtual bool good() = 0;

	/* read one unsigned byte */
	virtual File & operator>>(unsigned char &) = 0;
	};

	class ZipContainer;
	class ZipFile: public File {
	public:
	ZipFile(const Path::AbsolutePath & path, const Util::ReferenceCount<ZipContainer> & container);
	virtual ~ZipFile();
	virtual bool eof();
	virtual bool good();
	virtual int getSize();
	virtual bool canStream();
	virtual void seek(int position);
	virtual File & operator>>(unsigned char &);

	virtual int readLine(char * output, int size);

	protected:
	const Path::AbsolutePath path;
	const Util::ReferenceCount<ZipContainer> zip;
	bool atEof;
	};

	class NormalFile: public File {
	public:
	NormalFile(const Path::AbsolutePath & path, Access mode = Read);

	virtual int readLine(char * output, int size);
	virtual bool eof();
	virtual bool good();
	virtual int getSize();
	virtual bool canStream();
	virtual void seek(int position);
	virtual File & operator>>(unsigned char &);

	virtual ~NormalFile();

	protected:
	const Path::AbsolutePath path;
	std::fstream in;
	};

	class StringFile: public File {
	public:
	StringFile(const std::string & start);
	virtual int readLine(char * output, int size);
	virtual bool eof();
	virtual bool good();
	virtual int getSize();
	virtual bool canStream();
	virtual void seek(int position);
	virtual File & operator>>(unsigned char &);
	virtual ~StringFile();

	protected:
	std::string data;
	std::istringstream stream;
	};

	/* Contains information about an abstract File. */
	class Descriptor{
	public:
	Descriptor();

	virtual Util::ReferenceCount<File> open(File::Access mode) = 0;

	virtual ~Descriptor();
	};

	class Traverser;
	class Directory{
	public:
	Directory();
	virtual ~Directory();

	std::vector<Path::AbsolutePath> findFiles(const Path::AbsolutePath & dataPath, const std::string & find, bool caseInsensitive);

	void addFile(const Path::AbsolutePath & path, const Util::ReferenceCount<Descriptor> & file);
	void removeFile(const Path::AbsolutePath & path);

	std::vector<std::string> filenames() const;

	/* Might return NULL if the path can't be found */
	Util::ReferenceCount<Descriptor> lookup(const Path::AbsolutePath & path);

	protected:
	void doTraverse(const Path::AbsolutePath & path, Traverser & traverser);
	void traverse(const Path::AbsolutePath & path, Traverser & traverser);

	// Util::ReferenceCount<File> doLookup(const Path::AbsolutePath & path);

	std::map<std::string, Util::ReferenceCount<Directory> > directories;
	std::map<std::string, Util::ReferenceCount<Descriptor> > files;
	};

	class System{
	public:
	System();
	virtual ~System();

	typedef Path::AbsolutePath AbsolutePath;
	typedef Path::RelativePath RelativePath;

	virtual AbsolutePath find(const RelativePath & path) = 0;
	virtual RelativePath cleanse(const AbsolutePath & path) = 0;
	virtual bool exists(const RelativePath & path) = 0;
	virtual bool exists(const AbsolutePath & path);
	virtual std::vector<AbsolutePath> getFilesRecursive(const AbsolutePath & dataPath, const std::string & find, bool caseInsensitive = false) = 0;

	/* search for a pattern of a single file within a directory */
	virtual std::vector<AbsolutePath> getFiles(const AbsolutePath & dataPath, const std::string & find, bool caseInsensitive = false) = 0;

	/* Container should be a path to a zip file */
	virtual void addOverlay(const AbsolutePath & container, const AbsolutePath & where);
	virtual void removeOverlay(const AbsolutePath & container, const AbsolutePath & where);
	virtual std::vector<std::string> containerFileList(const AbsolutePath & container);

	/* search for some path which may contain wildcards in a directory */
	virtual std::vector<AbsolutePath> getFiles(const AbsolutePath & dataPath, const RelativePath & find, bool caseInsensitive);

	/* Gets all the files in all directories matched by the relative path */
	virtual std::vector<AbsolutePath> getFiles(const RelativePath & dataPath, const RelativePath & find, bool caseInsensitive) = 0;

	virtual AbsolutePath configFile() = 0;
	virtual AbsolutePath userDirectory() = 0;
	virtual std::vector<AbsolutePath> findDirectories(const RelativePath & path) = 0;
	virtual AbsolutePath findInsensitive(const RelativePath & path) = 0;
	virtual AbsolutePath lookupInsensitive(const AbsolutePath & directory, const RelativePath & path) = 0;

	virtual Util::ReferenceCount<File> open(const AbsolutePath & path, File::Access mode = File::Read);
	protected:
	virtual bool systemExists(const AbsolutePath & path) = 0;

	virtual void overlayFile(const AbsolutePath & where, Util::ReferenceCount<ZipContainer> zip);
	virtual void unoverlayFile(const AbsolutePath & where);

	// std::map<AbsolutePath, Util::ReferenceCount<ZipContainer> > overlays;
	Storage::Directory virtualDirectory;
	};

	System & instance();
	bool hasInstance();
	System & setInstance(const Util::ReferenceCount<System> & what);
	}

	/*
	* class Filesystem
	* class NetworkStorage
	* class ZipStorage
	*/
	class Filesystem: public Storage::System {
	public:
	Filesystem(const Path::AbsolutePath & dataPath);

	typedef Path::AbsolutePath AbsolutePath;
	typedef Path::RelativePath RelativePath;
	typedef Path::InsensitivePath InsensitivePath;
	typedef Storage::Exception Exception;
	typedef Storage::NotFound NotFound;

	/* given a relative path like sounds/arrow.png, prepend the proper
	* data path to it to give data/sounds/arrow.png
	*/
	AbsolutePath find(const RelativePath & path);

	/* like `find' but ignores case */
	AbsolutePath findInsensitive(const RelativePath & path);

	/* findInsensitive but starts in the given absolute directory path */
	AbsolutePath lookupInsensitive(const AbsolutePath & directory, const RelativePath & path);

	// void initialize();

	/* whether the file exists at all */
	using System::exists;
	bool exists(const RelativePath & path);

	/* remove the data path from a string
	* data/sounds/arrow.png -> sounds/arrow.png
	*/
	RelativePath cleanse(const AbsolutePath & path);

	/* returns all the directories starting with the given path.
	* will look in the main data directory, the user directory, and
	* the current working directory.
	*/
	std::vector<AbsolutePath> findDirectories(const RelativePath & path);

	/* user specific directory to hold persistent data */
	AbsolutePath userDirectory();

	/* user specific path to store the configuration file */
	AbsolutePath configFile();

	using Storage::System::getFiles;
	/* search a directory for some files matching pattern `find' */
	virtual std::vector<AbsolutePath> getFiles(const AbsolutePath & dataPath, const std::string & find, bool caseInsensitive = false);
	virtual std::vector<AbsolutePath> getFiles(const RelativePath & dataPath, const RelativePath & find, bool caseInsensitive);

	/* same as getFiles but search directories recursively */
	std::vector<AbsolutePath> getFilesRecursive(const AbsolutePath & dataPath, const std::string & find, bool caseInsensitive = false);

	protected:
	virtual bool systemExists(const AbsolutePath & path);
	AbsolutePath lookup(const RelativePath path);
	std::vector<AbsolutePath> findDirectoriesIn(const AbsolutePath & path);
	std::vector<AbsolutePath> getAllDirectories(const AbsolutePath & path);

	protected:
	Util::Thread::LockObject lock;
	AbsolutePath dataPath;
	};

	#endif

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