7 files changed, 232 insertions, 1 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 278d57e..616ab2d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,7 +5,10 @@ set(CMAKE_CXX_STANDARD 20)
 
 project(game-of-life CXX)
 
-file(GLOB SOURCES src/game_of_life.cpp)
+file(GLOB SOURCES
+	src/game_of_life.cpp
+	src/conversion.cpp
+	src/randomization.cpp)
 
 add_executable(${PROJECT_NAME} ${SOURCES})
 
diff --git a/src/conversion.cpp b/src/conversion.cpp
new file mode 100644
index 0000000..79b3587
--- /dev/null
+++ b/src/conversion.cpp
@@ -0,0 +1,41 @@
+#include "conversion.hpp"
+
+#include <climits>
+#include <stdexcept>
+
+unsigned int str_to_uint(const std::string_view &str)
+{
+	if (str.at(0) == '-')
+	{
+		throw "Less than 0";
+	}
+
+	std::size_t waste_pos = 0;
+
+	uint64_t num = 0;
+
+	try
+	{
+		num = std::stoul(str.data(), &waste_pos, NUMBER_BASE);
+	}
+	catch (const std::invalid_argument &exc)
+	{
+		throw "Not a number";
+	}
+	catch (const std::out_of_range &exc)
+	{
+		throw "Out of range";
+	}
+
+	if (waste_pos != str.length())
+	{
+		throw "Not a number";
+	}
+
+	if (num > UINT_MAX)
+	{
+		throw "Out of range";
+	}
+
+	return static_cast<unsigned int>(num);
+}
diff --git a/src/conversion.hpp b/src/conversion.hpp
new file mode 100644
index 0000000..4ae5b7c
--- /dev/null
+++ b/src/conversion.hpp
@@ -0,0 +1,13 @@
+#pragma once
+
+#include <string_view>
+
+constexpr unsigned int NUMBER_BASE = 10U;
+
+/**
+ * Converts a string to a unsigned integer.
+ *
+ * @param str A string that possibly is a unsigned integer
+ * @returns A unsigned integer
+ */
+unsigned int str_to_uint(const std::string_view &str);
diff --git a/src/game/options.hpp b/src/game/options.hpp
new file mode 100644
index 0000000..98360b8
--- /dev/null
+++ b/src/game/options.hpp
@@ -0,0 +1,10 @@
+#pragma once
+
+#include "randomization.hpp"
+
+#include <memory>
+
+struct GameOptions
+{
+	std::shared_ptr<RandomNumberGenerator> random_gen;
+};
diff --git a/src/game_of_life.cpp b/src/game_of_life.cpp
index e69de29..32d393e 100644
--- a/src/game_of_life.cpp
+++ b/src/game_of_life.cpp
@@ -0,0 +1,108 @@
+#include "conversion.hpp"
+#include "game/options.hpp"
+#include "randomization.hpp"
+
+#include <getopt.h>
+#include <iostream>
+#include <memory>
+#include <string_view>
+#include <vector>
+
+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)
+{
+	unsigned int num = 0;
+
+	try
+	{
+		num = str_to_uint(get_str_optarg());
+
+		if (check_zero && num == 0)
+		{
+			throw "It should not be 0";
+		}
+	}
+	catch (const char *error)
+	{
+		optarg_error(arg, std::string_view(error));
+	}
+
+	return num;
+}
+} // namespace
+
+constexpr std::array<option, 8> options = {
+	option({"seed", required_argument, nullptr, 's'}),
+	option({"help", no_argument, nullptr, 0}), option({nullptr, 0, nullptr, 0})};
+
+int main(int argc, char *argv[])
+{
+	auto args = std::vector<std::string_view>(argv, argv + argc);
+
+	GameOptions game_options;
+
+	char arg = 0;
+	while ((arg = static_cast<char>(
+				getopt_long(argc, argv, "s:", options.data(), nullptr))) != -1)
+	{
+		switch (arg)
+		{
+		case 's':
+		{
+			auto seed = get_uint_optarg(arg, true);
+
+			game_options.random_gen = std::make_shared<RandomNumberGenerator>(seed);
+			break;
+		}
+		case 0:
+		{
+			std::cout << "Usage: " << args[0]
+					  << " [OPTION]...\n\n"
+						 "Options:\n"
+					  << "  -s, --seed SEED         The randomization seed used\n"
+						 "      --help              Displays usage information"
+					  << std::endl;
+			return EXIT_SUCCESS;
+		}
+		case '?':
+		{
+			std::cout << "\nTry '" << args[0] << " --help' for more information"
+					  << std::endl;
+			return EXIT_FAILURE;
+		}
+		default:
+			abort();
+		}
+	}
+
+	if (game_options.random_gen == nullptr)
+	{
+		game_options.random_gen = std::make_shared<RandomNumberGenerator>();
+	}
+
+	// auto game = Game(game_options);
+
+	// game.run();
+}
diff --git a/src/randomization.cpp b/src/randomization.cpp
new file mode 100644
index 0000000..8f233d2
--- /dev/null
+++ b/src/randomization.cpp
@@ -0,0 +1,21 @@
+#include "randomization.hpp"
+
+RandomNumberGenerator::RandomNumberGenerator(const unsigned int &seed)
+{
+	this->_generator = std::make_unique<std::mt19937>(seed);
+}
+
+RandomNumberGenerator::RandomNumberGenerator()
+{
+	std::random_device random_device;
+
+	this->_generator = std::make_unique<std::mt19937>(random_device());
+}
+
+unsigned int RandomNumberGenerator::in_range(const unsigned int &a,
+											 const unsigned int &b) const
+{
+	auto random_distribution = std::uniform_int_distribution<unsigned int>(a, b);
+
+	return random_distribution(*this->_generator);
+}
diff --git a/src/randomization.hpp b/src/randomization.hpp
new file mode 100644
index 0000000..b4931d7
--- /dev/null
+++ b/src/randomization.hpp
@@ -0,0 +1,35 @@
+#pragma once
+
+#include <memory>
+#include <random>
+
+/**
+ * Pseudo-random unsigned integer generator.
+ */
+class RandomNumberGenerator
+{
+public:
+	/**
+	 * Creates a pseudo-random number generator.
+	 *
+	 * @param seed A number generation seed
+	 */
+	explicit RandomNumberGenerator(const unsigned int &seed);
+
+	/**
+	 * Creates a pesudo-random number generator.
+	 */
+	RandomNumberGenerator();
+
+	/**
+	 * Generates a number in the range of a to b.
+	 *
+	 * @param a A number lower than b
+	 * @param b A number greater than a
+	 */
+	[[nodiscard]] unsigned int in_range(const unsigned int &a,
+										const unsigned int &b) const;
+
+private:
+	std::unique_ptr<std::mt19937> _generator;
+};