/*
 * ViSP, open source Visual Servoing Platform software.
 * Copyright (C) 2005 - 2024 by Inria. All rights reserved.
 *
 * This software 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 2 of the License, or
 * (at your option) any later version.
 * See the file LICENSE.txt at the root directory of this source
 * distribution for additional information about the GNU GPL.
 *
 * For using ViSP with software that can not be combined with the GNU
 * GPL, please contact Inria about acquiring a ViSP Professional
 * Edition License.
 *
 * See https://visp.inria.fr for more information.
 *
 * This software was developed at:
 * Inria Rennes - Bretagne Atlantique
 * Campus Universitaire de Beaulieu
 * 35042 Rennes Cedex
 * France
 *
 * If you have questions regarding the use of this file, please contact
 * Inria at visp@inria.fr
 *
 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 * Description:
 * Read images on the disk.
 */

#include <visp3/core/vpDebug.h>
#include <visp3/core/vpImage.h>
#include <visp3/core/vpIoTools.h>
#include <visp3/io/vpImageIo.h>
#include <visp3/io/vpParseArgv.h>

#include <stdlib.h>

/*!
  \example testReadImage.cpp

  \brief Read images on the disk.

*/

#ifdef ENABLE_VISP_NAMESPACE
using namespace VISP_NAMESPACE_NAME;
#endif

// List of allowed command line options
#define GETOPTARGS "cdi:p:h"

void usage(const char *name, const char *badparam, std::string ipath);
bool getOptions(int argc, const char **argv, std::string &ipath, std::string &ppath);

/*

  Print the program options.

  \param name : Program name.
  \param badparam : Bad parameter name.
  \param ipath : Input image path.

 */
void usage(const char *name, const char *badparam, std::string ipath)
{
  fprintf(stdout, "\n\
Read images on the disk.\n\
\n\
SYNOPSIS\n\
  %s [-i <input image path>] [-p <personal image path>]\n\
     [-h]\n\
",
name);

  fprintf(stdout, "\n\
OPTIONS:                                               Default\n\
  -i <input image path>                                %s\n\
     Set image input path.\n\
     From this path read \"Klimt/Klimt.pgm,\n\
     .ppm, .jpeg and .png images.\n\
     Setting the VISP_INPUT_IMAGE_PATH environment\n\
     variable produces the same behaviour than using\n\
     this option.\n\
\n\
  -p <personal image path>                               \n\
     Path to an image used to test image reading function.\n\
     Example: -p /my_path_to/image.png\n\
\n\
  -h\n\
     Print the help.\n\n",
          ipath.c_str());

  if (badparam)
    fprintf(stdout, "\nERROR: Bad parameter [%s]\n", badparam);
}

/*!

  Set the program options.

  \param argc : Command line number of parameters.
  \param argv : Array of command line parameters.
  \param ipath : Input image path.
  \param ppath : Personal image path.
  \return false if the program has to be stopped, true otherwise.

*/
bool getOptions(int argc, const char **argv, std::string &ipath, std::string &ppath)
{
  const char *optarg_;
  int c;
  while ((c = vpParseArgv::parse(argc, argv, GETOPTARGS, &optarg_)) > 1) {

    switch (c) {
    case 'i':
      ipath = optarg_;
      break;
    case 'p':
      ppath = optarg_;
      break;
    case 'h':
      usage(argv[0], nullptr, ipath);
      return false;

    case 'c':
    case 'd':
      break;

    default:
      usage(argv[0], optarg_, ipath);
      return false;
    }
  }

  if ((c == 1) || (c == -1)) {
    // standalone param or error
    usage(argv[0], nullptr, ipath);
    std::cerr << "ERROR: " << std::endl;
    std::cerr << "  Bad argument " << optarg_ << std::endl << std::endl;
    return false;
  }

  return true;
}

int main(int argc, const char **argv)
{
  try {
    std::string env_ipath;
    std::string opt_ipath;
    std::string opt_ppath;
    std::string ipath;
    std::string filename;

    // Get the visp-images-data package path or VISP_INPUT_IMAGE_PATH
    // environment variable value
    env_ipath = vpIoTools::getViSPImagesDataPath();

    // Set the default input path
    if (!env_ipath.empty())
      ipath = env_ipath;

    // Read the command line options
    if (getOptions(argc, argv, opt_ipath, opt_ppath) == false) {
      return EXIT_FAILURE;
    }

    // Get the option values
    if (!opt_ipath.empty())
      ipath = opt_ipath;

    // Compare ipath and env_ipath. If they differ, we take into account
    // the input path coming from the command line option
    if (!opt_ipath.empty() && !env_ipath.empty()) {
      if (ipath != env_ipath) {
        std::cout << std::endl << "WARNING: " << std::endl;
        std::cout << "  Since -i <visp image path=" << ipath << "> "
          << "  is different from VISP_IMAGE_PATH=" << env_ipath << std::endl
          << "  we skip the environment variable." << std::endl;
      }
    }

    //
    // Here starts really the test
    //

    /////////////////////////////////////////////////////////////////////
    // Create a grey level image
    // vpImage<vpRGBa> I;
    vpImage<unsigned char> I;
    vpImage<vpRGBa> Irgb;

    if (opt_ppath.empty()) {
      filename = vpIoTools::createFilePath(ipath, "Klimt/Klimt.ppm");
      vpImageIo::read(I, filename);
      printf("Read ppm ok\n");
      filename = vpIoTools::createFilePath(ipath, "Klimt/Klimt.pgm");
      vpImageIo::read(I, filename);
      printf("Read pgm ok\n");
      filename = vpIoTools::createFilePath(ipath, "Klimt/Klimt.jpeg");
      vpImageIo::read(I, filename);
      printf("Read jpeg ok\n");
      filename = vpIoTools::createFilePath(ipath, "Klimt/Klimt.png");
      vpImageIo::read(I, filename);
      printf("Read png ok\n");

      filename = vpIoTools::createFilePath(ipath, "Klimt/Klimt.ppm");
      vpImageIo::read(Irgb, filename);
      printf("Read ppm ok\n");
      filename = vpIoTools::createFilePath(ipath, "Klimt/Klimt.pgm");
      vpImageIo::read(Irgb, filename);
      printf("Read pgm ok\n");
      filename = vpIoTools::createFilePath(ipath, "Klimt/Klimt.jpeg");
      vpImageIo::read(Irgb, filename);
      printf("Read jpeg ok\n");
      filename = vpIoTools::createFilePath(ipath, "Klimt/Klimt.png");
      vpImageIo::read(Irgb, filename);
      printf("Read png ok\n");
    }
    else {
      filename = opt_ppath;
      vpImageIo::read(I, filename);
      printf("Image \"%s\" read successfully\n", filename.c_str());
    }
  }
  catch (const vpException &e) {
    std::cout << "Catch an exception: " << e.getMessage() << std::endl;
    return EXIT_FAILURE;
  }
  return EXIT_SUCCESS;
}