// g2o - General Graph Optimization
// Copyright (C) 2011 R. Kuemmerle, G. Grisetti, W. Burgard
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright notice,
//   this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
//   notice, this list of conditions and the following disclaimer in the
//   documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
// PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
// TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef G2O_COMMAND_ARGS_H
#define G2O_COMMAND_ARGS_H

#include <iostream>
#include <string>
#include <vector>

#include "g2o_stuff_api.h"

namespace g2o {

/**
 * \brief Command line parsing of argc and argv.
 *
 * Parse the command line to get the program options. Additionally,
 * we can store the config in a file and reload a parameter set from
 * this file.
 */
class G2O_STUFF_API CommandArgs {
 public:
  struct CommandArgument {
    std::string name;
    std::string description;
    int type = 0;
    void* data = nullptr;
    bool parsed = false;
    bool optional = false;
    CommandArgument() = default;
  };

  virtual ~CommandArgs() = default;

  /**
   * parse the command line for the requested parameters.
   * @param argc the number of params
   * @param argv the value array
   * @param exitOnError call exit() if the parsing fails
   * @return true, if parsing was correct
   */
  bool parseArgs(int argc, char** argv, bool exitOnError = true);

  /** add a bool parameter, if found on the command line, will toggle defValue
   */
  void param(const std::string& name, bool& p, bool defValue,
             const std::string& desc);
  /** add a int parameter */
  void param(const std::string& name, int& p, int defValue,
             const std::string& desc);
  /** add a float parameter */
  void param(const std::string& name, float& p, float defValue,
             const std::string& desc);
  /** add a float parameter */
  void param(const std::string& name, double& p, double defValue,
             const std::string& desc);
  /** add a string parameter */
  void param(const std::string& name, std::string& p,
             const std::string& defValue, const std::string& desc);
  /** add an int vector parameter */
  void param(const std::string& name, std::vector<int>& p,
             const std::vector<int>& defValue, const std::string& desc);
  /** add an vector of doubles as a parameter */
  void param(const std::string& name, std::vector<double>& p,
             const std::vector<double>& defValue, const std::string& desc);
  /** add a param which is specified as a plain argument */
  void paramLeftOver(const std::string& name, std::string& p,
                     const std::string& defValue, const std::string& desc,
                     bool optional = false);

  /**
   * print the value of all params to an ostream
   */
  void printParams(std::ostream& os);

  //! return the banner string
  [[nodiscard]] const std::string& getBanner() const { return banner_; }
  void setBanner(const std::string& banner);

  /**
   * print the help
   */
  void printHelp(std::ostream& os);

  /**
   * returns true, if the param was parsed via the command line
   */
  [[nodiscard]] bool parsedParam(const std::string& paramFlag) const;

 protected:
  std::vector<CommandArgument> args_;
  std::vector<CommandArgument> leftOvers_;
  std::vector<CommandArgument> leftOversOptional_;
  std::string banner_;
  std::string progName_;

  static const char* type2str(int t);
  static void str2arg(const std::string& input, CommandArgument& ca);
  static std::string arg2str(const CommandArgument& ca);
};

}  // namespace g2o

#endif