/*
 * PlotTools.hh
 *
 *  Created on: 15 nov. 2013
 *      Author: guillaume
 */

#ifndef PLOTTOOLS_HH_
#define PLOTTOOLS_HH_

#include <string>

#include <boost/filesystem.hpp>
#include <boost/filesystem/path.hpp>
//#include <boost/gil/extension/io/png_dynamic_io.hpp>

class PlotTools {
public:

	/**
	 * @brief Convert SVG, PDF or PS file format to PNG format.
	 * @return Return converted filename which contain input filename without input format( result.svg => result.png).
	 */
	static std::string convert2Png(const std::string pInputFile) {
		// Get input file format
		size_t pos = pInputFile.find_last_of(".");
		std::string lInputFormat = pInputFile.substr(pos + 1);
		// Copy input filename and replace format to "png".
		std::string lOutputFile = pInputFile;
		std::string lOutputFormat = "png";
		lOutputFile.replace(pos + 1, lOutputFormat.size(), lOutputFormat);


		if (lInputFormat == "svg") {
			// rsvg can only convert svg format to png.
			std::system(std::string("rsvg-convert " + pInputFile + " -f png -o " + lOutputFile).c_str());
		} else {
			// Ghostscript can only convert ps and pdf format to png.
			std::system(std::string("gs -r300x300 -sDEVICE=pngalpha -o " + lOutputFile + " " + pInputFile).c_str());
		}

		return lOutputFile;
	}

	/**
	 * @brief Calculate error rate between reference file and result file.
	 * @note Files must be in PNG format and using RGB 8-bit color.
	 * @return Return error rate in percent (it corresponds to proportion of wrong pixel).
	 */
	/*static double calculateErrorRate(std::string pReferenceFile, std::string pResultFile) {
		// Check if file exist
		if ( (access(pReferenceFile.c_str(), F_OK) == 0) && (access(pResultFile.c_str(), F_OK) == 0) ) {
			// Read file
			using namespace boost::gil;
			rgba8_image_t imRef;
			point2<std::ptrdiff_t> lPointRef = png_read_dimensions(pReferenceFile);
			png_read_image(pReferenceFile, imRef);
			rgba8_pixel_t pixelRef;

			rgba8_image_t imRes;
			point2<std::ptrdiff_t> lPointRes = png_read_dimensions(pResultFile);
			png_read_image(pResultFile, imRes);
			rgba8_pixel_t pixelRes;

			// Calculate error rate.
			int invPixel = 0;
			for (int x = 0; x != lPointRef.x; x++) {
				for (int y = 0; y != lPointRef.y; y++) {
					pixelRef = view(imRef)(x, y);
					pixelRes = view(imRes)(x, y);

					// TODO error rate can be improved by saying which element is wrong (Red, Green or blue)
					// and not pixel.
					// TODO error rate can also be improved by not taking into account pixel change from [255, 255, 255] to [0, 0, 0] and vice versa.
					if( ((int)pixelRef[0] != (int)pixelRes[0]) || ((int)pixelRef[1] != (int)pixelRes[1]) || ((int)pixelRef[2] != (int)pixelRes[2])  ) {
						invPixel ++;
						//std::cout<<"pixel {"<<x<<", "<<y<<"}: "<<std::endl;
						//std::cout<<"red = "<<(int)pixelRef[0]<<" green = "<<(int)pixelRef[1]<<" blue = "<<(int)pixelRef[2]<<std::endl;
						//std::cout<<"red = "<<(int)pixelRes[0]<<" green = "<<(int)pixelRes[1]<<" blue = "<<(int)pixelRes[2]<<std::endl;
					}
				}
			}
			std::cout<<invPixel<<" / "<<lPointRef.x * lPointRef.y<<" invalid pixel {"<<(invPixel / (float)(lPointRef.x * lPointRef.y)) * 100<<"%}"<<std::endl;
			return (invPixel / (float)(lPointRef.x * lPointRef.y)) * 100;
		} else {
			return nan(std::string("").c_str());
		}
	}*/
};

#endif /* PLOTTOOLS_HH_ */