/*
    open source routing machine
    Copyright (C) Dennis Luxen, others 2010

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU AFFERO General Public License as published by
the Free Software Foundation; either version 3 of the License, or
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 Affero General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
or see http://www.gnu.org/licenses/agpl.txt.
 */

#ifndef POLYLINECOMPRESSOR_H_
#define POLYLINECOMPRESSOR_H_

#include "ExtractorStructs.h"

class PolylineCompressor {
private:
	inline string encodeSignedNumber(int number) const {
	    int signedNumber = number << 1;
	    if (number < 0) {
	        signedNumber = ~(signedNumber);
	    }
	    return (encodeNumber(signedNumber));
	}

	inline string encodeNumber(int numberToEncode) const {
	    ostringstream encodeString;

	    while (numberToEncode >= 0x20) {
	        int nextValue = (0x20 | (numberToEncode & 0x1f)) + 63;
	        encodeString << (static_cast<char> (nextValue));
	        numberToEncode >>= 5;
	    }

	    numberToEncode += 63;
	    encodeString << (static_cast<char> (numberToEncode));

	    return encodeString.str();
	}
public:
	inline void printEncodedString(vector<_Coordinate>& polyline, string &output) {
		output += encodeSignedNumber(polyline[0].lat);
		output += encodeSignedNumber(polyline[0].lon);
		for(unsigned i = 1; i < polyline.size(); i++) {
			output += encodeSignedNumber(polyline[i].lat - polyline[i-1].lat);
			output += encodeSignedNumber(polyline[i].lon - polyline[i-1].lon);
		}
	}

	inline void printUnencodedString(vector<_Coordinate> & polyline, string & output) {
		string tmp;
		for(unsigned i = 0; i < polyline.size(); i++) {
			convertLatLon(polyline[i].lat, tmp);
			output += "[";
			output += tmp;
			convertLatLon(polyline[i].lon, tmp);
			output += ", ";
			output += tmp;
			output += "]";
			if( i < polyline.size()-1 ) {
				output += ",";
			}
		}

	}
};

#endif /* POLYLINECOMPRESSOR_H_ */