#include <iostream>
#include <iomanip>
#include <compare>
#include <thread>
#include <mutex>
#include <vector>
#include <chrono>
#include <string>

struct SpaceShip {
	int i;

	std::strong_ordering operator<=>(SpaceShip const& rhs) {
		return i <=> rhs.i;
	}
};

void spaceship(int a, int b) {
	std::cout << "a: " << a << "\n";
	std::cout << "b: " << b << "\n";
	auto result = (a <=> b);
	if (result < 0) std::cout << "a <=> b is negative\n";
	if (result > 0) std::cout << "a <=> b is positive\n";
	if (result == 0) std::cout << "a <=> b is equivalent\n";
}

std::mutex cout_mutex;
void print(int taskID, int i, int j) {
	const std::lock_guard<std::mutex> lock(cout_mutex);
	std::cout << "Task i " << taskID << " i: " << i << " " << "j: " << j << "\n";
}

void hardTask(int taskID) {
	constexpr int items = 100;
	for (int i = 0; i < items; i++) {
		for (int j = 0; j < items; j++) {
			if (rand() % 1000 < 2)
				print(taskID, i, j);
			std::sin(i * j);
		}
	}
	const std::lock_guard<std::mutex> lock(cout_mutex);
	std::cout << "Task " << taskID << " done\n";
}

void supercomputer() {
	std::vector<std::thread> threadPool;
	for (int i = 0; i < 32; i++)
		threadPool.push_back(std::thread(hardTask, i));

	for (auto& t : threadPool) {
		t.join();
	}
}

int game_done = 0;
std::string message;
std::mutex game_mutex;

void display_thread() {
	while (!game_done) {
		if (!message.empty()) {
			std::cout << message << "\n";
			const std::lock_guard<std::mutex> lock(game_mutex);
			message.clear();
		}
		using namespace std::chrono_literals;
		std::this_thread::sleep_for(1s);
	}
}

void input_thread() {
	while (!game_done) {
		std::string input;
		std::getline(std::cin, input);
		if (input == "quit") {
			const std::lock_guard<std::mutex> lock(game_mutex);
			game_done = 1;
		}
		else if (!input.empty()) {
			const std::lock_guard<std::mutex> lock(game_mutex);
			message = input;
		}
	}
}

void game() {
	std::thread display(display_thread);
	std::thread input(input_thread);
	input.join();
	display.join();
}

int main() {
	//spaceship(1, 3);
	//spaceship(3, 1);
	//spaceship(1, 1);
	//spaceship(0, 0);

	//supercomputer();

	game();

	return 0;
}