#pragma once

#include <thread>
#include <chrono>
#include <stack>

#include "People.h"
#include "Canvas.h"
#include "CollisionContext.h"
#include "PathfindingContext.h"

using namespace std::chrono_literals;

class Museum {
public:
	Museum();
	virtual ~Museum();

public:
	People people;
	Canvas canvas;
	CollisionContext collision;
	PathfindingContext pathfinding;

public:
	bool paused = true;
	void update();
	void skip_forward();
	void skip_backward();

private:
	int jump = 0;

private:
	bool working = true;
	std::thread * worker = nullptr;
	void work();

private:
	unsigned long long tick = 0;
	static constexpr std::chrono::milliseconds tick_interval = 15ms;

private:
	static constexpr unsigned snapshot_ticks = 50;
	struct Snapshot {
		unsigned long long tick;
		Memories memories;
	};
	std::stack<Snapshot, std::vector<Snapshot>> history;
	Snapshot save_snapshot();
	void restore_snapshot(const Snapshot &);
};