#include "input_parsing.h"
#include "constants.h"

#include <getopt.h>
#include <stdlib.h>
#include <iostream> 

ProgramOptions get_params(int argc, char *argv[])
{
	int max_range = MAX_VALUES, num_entries = DEFAULT_NR_ENTRIES;
    bool is_seed_specified = false;

	static struct option long_options[] = {
                   {"max-range",     required_argument, 0,  'm' },
                   {"num-entries",  required_argument, 0,  'n' },
                   {"seed",  required_argument, 0,  's' },
                   {0,         0,                 0,  0 }
               };
	
	int option, option_index, seed = 0;
	while (( option = getopt_long(argc, argv, "m:n:s:", long_options, &option_index)))
	{
		if (option == -1)
		{
			break;
		}

		switch (option)
		{
			case 'm':
			max_range = atoi(optarg);
			break;

			case 'n':
			num_entries = atoi(optarg);
			break;

			case 's':
			is_seed_specified = true;
			seed = atoi(optarg);
			break;

			default:
			std::cerr << "Incorrect character code returned: %d" << option;
		}
	}

	using return_type = std::optional<int>;

	return {max_range, num_entries, is_seed_specified ? return_type(seed): std::nullopt};
}