#pragma once

#include <chrono>
#include <cmath>
#include <vector>
#include <algorithm>

#include "basics.h"

struct App{
	std::vector<User*> people_online;
	int uid{0};

	void update_positions(){
		const float speed = 0.4;

		typedef std::chrono::duration<double, std::ratio<1,1>> fseconds;
		static auto start = std::chrono::steady_clock::now();
		auto end = std::chrono::steady_clock::now();
		double time = std::chrono::duration_cast<fseconds>(end-start).count();

		//std::cout << time << std::endl;
		auto n = people_online.size();
		for(int i = 0; i < n; ++i){
			User& user = *people_online[i];
			double x = cos(speed * time + 2*M_PI*i/double(n));
			double y = sin(speed * time + 2*M_PI*i/double(n));

			user.position.x = 200 + 200*x;
			user.position.y = 200 + 200*y;
		}
	}

	void login(User& user){
		user.index = uid++;
		people_online.push_back(&user);
	}

	void logout(User& user){
		people_online.erase(std::remove(people_online.begin(), people_online.end(), &user), people_online.end());
	}
};