/*************************************************************************
** SVGOutput.hpp                                                        **
**                                                                      **
** This file is part of dvisvgm -- a fast DVI to SVG converter          **
** Copyright (C) 2005-2023 Martin Gieseking <martin.gieseking@uos.de>   **
**                                                                      **
** 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/>. **
*************************************************************************/

#ifndef SVGOUTPUT_HPP
#define SVGOUTPUT_HPP

#include <memory>
#include <ostream>
#include <string>
#include "FilePath.hpp"


struct SVGOutputBase {
	class HashTriple {
		public:
			HashTriple () =default;
			HashTriple (std::string dviHash, std::string optHash, std::string cmbHash)
				: _dviHash(std::move(dviHash)), _optHash(std::move(optHash)), _cmbHash(std::move(cmbHash)) {}
			std::string dviHash () const {return _dviHash;}
			std::string optHash () const {return _optHash;}
			std::string cmbHash () const {return _cmbHash;}
			bool empty () const {return _dviHash.empty();}

		private:
			std::string _dviHash;  ///< hash of plain DVI data
			std::string _optHash;  ///< hash of options affecting the SVG document
			std::string _cmbHash;  ///< combined hash of DVI data and options
	};

	virtual ~SVGOutputBase () =default;
	virtual std::ostream& getPageStream (int page, int numPages, const HashTriple &hashes=HashTriple()) const =0;
	virtual FilePath filepath (int page, int numPages, const HashTriple &hashes= HashTriple()) const =0;
	virtual void finish () =0;
	virtual bool ignoresHashes () const {return true;}
};


class SVGOutput : public SVGOutputBase {
	public:
		SVGOutput () =default;
		explicit SVGOutput (const std::string &base) : SVGOutput(base, "", 0) {}
		SVGOutput (const std::string &base, const std::string &pattern) : SVGOutput(base, pattern, 0) {}
		SVGOutput (const std::string &base, std::string pattern, int zipLevel);
		std::ostream& getPageStream (int page, int numPages, const HashTriple &hash=HashTriple()) const override;
		FilePath filepath (int page, int numPages, const HashTriple &hash=HashTriple()) const override;
		void finish () override {_osptr.reset();}
		bool ignoresHashes () const override;
		void setFileNumbers (int fileNumber, int fileCount) {_fileNumber = fileNumber; _fileCount = fileCount;}

	protected:
		std::string expandFormatString (std::string str, int page, int numPages, const HashTriple &hashes) const;

	private:
		FilePath _path;
		std::string _pattern;
		bool _stdout=true;    ///< write to STDOUT?
		int _zipLevel=0;      ///< compression level
		int _fileNumber=1;    ///< current number of file in sequence of files
		int _fileCount=1;     ///< number of files in sequence
		mutable int _page=-1; ///< number of current page being written
		mutable std::unique_ptr<std::ostream> _osptr;
};

#endif
