Smartest and fastest collision detection and stopping

#include "pch.h"
#include <iostream>
#include <SFML/Graphics.hpp>
#include <SFML/Window.hpp>

using namespace std;

int width = 800, height = 600;

int main()
{
    sf::RenderWindow window(sf::VideoMode(width, height), "In Development");
    window.setFramerateLimit(70);
    window.setVerticalSyncEnabled(true);

    sf::RectangleShape player;
    player.setFillColor(sf::Color::Cyan);
    player.setSize(sf::Vector2f(40, 40));
    player.setPosition(width / 2, height / 2);

    sf::RectangleShape bigBlock;
    bigBlock.setSize(sf::Vector2f(100, 100));
    bigBlock.setFillColor(sf::Color::Black);
    bigBlock.setPosition((width / 2) - 300, height / 2);

    int direction = 0;

    sf::Event event;
    while (window.isOpen())
    {
        while (window.pollEvent(event))
        {
            if (event.type == sf::Event::Closed)
                window.close();
            else if (event.type == sf::Event::KeyPressed)
            {
                if (event.key.code == sf::Keyboard::Right)
                {
                    player.move(5, 0);
                    direction = 1;
                }
                else if (event.key.code == sf::Keyboard::Left)
                {
                    player.move(-5, 0);
                    direction = 2;
                }
                else if (event.key.code == sf::Keyboard::Up)
                {
                    player.move(0, -5);
                    direction = 3;
                }
                else if (event.key.code == sf::Keyboard::Down)
                {
                    player.move(0, 5);
                    direction = 4;
                }
            }
        }

        sf::FloatRect player_boundingBox = player.getGlobalBounds();
        if (player_boundingBox.intersects(bigBlock.getGlobalBounds()))
        {
            if (direction == 1)
                player.setPosition(bigBlock.getPosition().x - 40, player.getPosition().y);
            else if(direction == 2)
                player.setPosition(bigBlock.getPosition().x + 100, player.getPosition().y);
            else if(direction == 3)
                player.setPosition(player.getPosition().x, bigBlock.getPosition().y + 100);
            else if(direction == 4)
                player.setPosition(player.getPosition().x, bigBlock.getPosition().y - 40);
        }

        window.clear(sf::Color::White); //Clear

        window.draw(bigBlock);
        window.draw(player);

        window.display(); //Display
    }

    int pause; cin >> pause; //Pause the program
    return 0;
}