#include "argument_parser.hpp"

#include "conversion.hpp"
#include "interfaces/randomization.hpp"

#include <cstdlib>
#include <iostream>
#include <string_view>

namespace
{
void optarg_error(char arg, const std::string_view &error)
{
	std::cout << "Error: Invalid option argument for -" << arg << ". " << error
			  << std::endl;
	exit(EXIT_FAILURE);
}

/**
 * Returns the current optarg as a string view.
 */
std::string_view get_str_optarg()
{
	return std::string_view(optarg);
}

/**
 * Returns the current optarg as a unsigned integer.
 *
 * @param arg The current command-line argument character
 * @param check_zero Whether or not to make sure that the result is not zero
 */
unsigned int get_uint_optarg(char arg, bool check_zero = false)
{
	auto conversion_result = str_to_uint(get_str_optarg());

	if (!conversion_result.success || (check_zero && conversion_result.result == 0))
	{
		optarg_error(arg, conversion_result.fail_reason);
	}

	return conversion_result.result;
}
} // namespace

ArgumentParser::ArgumentParser(
	IRandomNumberGeneratorFactory random_number_generator_factory)
	: _random_number_generator_factory(std::move(random_number_generator_factory))
{
}

ParsedArguments
ArgumentParser::parse(const std::vector<option> &options,
					  const std::string_view &short_options, const int &argc,
					  char *const *argv) // NOLINT(cppcoreguidelines-avoid-c-arrays,
										 // modernize-avoid-c-arrays)
{
	// NOLINTNEXTLINE(cppcoreguidelines-pro-bounds-pointer-arithmetic)
	const auto args = std::vector<std::string_view>(argv, argv + argc);

	const auto program_name = args[0];

	ParsedArguments parsed_arguments;

	char arg = 0;
	while ((arg = static_cast<char>(getopt_long(argc, argv, short_options.data(),
												options.data(), nullptr))) != -1)
	{
		switch (arg)
		{
		case 's':
		{
			auto seed = get_uint_optarg(arg, true);

			parsed_arguments.random_gen = _random_number_generator_factory(seed);
			break;
		}
		case 'h':
		{
			std::cout << "Usage: " << program_name
					  << " [OPTION]...\n\n"
						 "Options:\n"
					  << "  -s, --seed SEED         The randomization seed used\n"
						 "  -h  --help              Displays usage information"
					  << std::endl;
			exit(EXIT_SUCCESS);
		}
		case '?':
		{
			std::cout << "\nTry '" << program_name << " --help' for more information"
					  << std::endl;
			exit(EXIT_FAILURE);
		}
		default:
			abort();
		}
	}

	return parsed_arguments;
}