#include "Configuration.hpp"

#include <iostream>
#include <stdexcept>

#include "MpiEnvironment.hpp"
#include <boost/format.hpp>
#include <boost/program_options.hpp>

auto Configuration::parseArgs(int argc, char* argv[], const MpiEnvironment& env)
    -> Configuration {
	// parse cmd args
	namespace po = boost::program_options;
	Configuration cfg;
	po::options_description desc{"Allowed options"};
	desc.add_options()("help,h", "produce help message") //
	    ("gridrows,r", po::value<std::size_t>(&cfg.GridRows)->default_value(0),
	     "number of rows in the grid") //
	    ("gridcols,c",
	     po::value<std::size_t>(&cfg.GridColumns)->default_value(0),
	     "number of columns in the grid") //
	    ("file,f", po::value<std::string>(&cfg.InputFilePath)->required(),
	     "path to wireworld file"); //

	po::variables_map vm;
	po::store(po::parse_command_line(argc, argv, desc), vm);

	if (vm.count("help") > 0 && env.isMaster()) { std::cout << desc << "\n"; }
	po::notify(vm);

	// if no dimensions given, use MPI_Dims_create
	if (cfg.GridColumns < 1 || cfg.GridRows < 1) {
		std::array<int, 2> dims{static_cast<int>(cfg.GridColumns),
		                        static_cast<int>(cfg.GridRows)};
		MPI_Dims_create(env.worldSize(), // nnodes
		                2,               // ndims
		                dims.data()      // dims
		                );
		cfg.GridColumns = dims[0];
		cfg.GridRows = dims[1];
	}

	// validate
	const auto& totalCellCount = cfg.GridColumns * cfg.GridRows;
	const auto& worldSize = env.worldSize();
	if (totalCellCount != worldSize) {
		std::cerr << boost::format("Total number of cells (%d) does not match "
		                           "the MPI World size (%d)") %
		                 totalCellCount % worldSize;
		MPI_Abort(MPI_COMM_WORLD, EXIT_FAILURE);
	}
	return cfg;
}