changing the order of blinking leds with push button

Other Hardware LEDs and Multiplexing
1

I am new to Arduino and I have written a code that makes 3 LEDs blink while the push button is off so the light are blinking from left to right (1,0,0)(0,1,0)(0,0,1) and then repeat from left to right. Now I am trying to modify this code so that whenever the system receives a High from the switch it reverse the order so it should start blinking from right to left and keeps blinking that way until I press the push button and then return to left to right order. I hope my issue is clear. I only know how to use if & else.

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this is the initial code ( from left to right only ):

 int switchState = 0;
int switchst = LOW;

void setup(){

pinMode(3,OUTPUT);
pinMode(4,OUTPUT);
pinMode(5,OUTPUT);
pinMode(2,INPUT);}

void loop(){    

switchState = digitalRead(2);

 if (switchState == switchst){
 digitalWrite(3,~switchst);
 digitalWrite(4,switchst);
 digitalWrite(5,switchst);
 delay(200);
 digitalWrite(3,switchst);
 digitalWrite(4,~switchst);
 digitalWrite(5,switchst);
 delay(200);
 digitalWrite(3,switchst);
 digitalWrite(4,switchst);
 digitalWrite(5,~switchst);
 delay(200);}

 else {
 digitalWrite(3,switchst);
 digitalWrite(4,switchst);
 digitalWrite(5,switchst);}}

this is the modified one: (if I press the push button it reverse the order but it only blinks for once and then stops)

int switchState;
int switchst = LOW;
int d=LOW;
void setup(){

pinMode(3,OUTPUT);
pinMode(4,OUTPUT);
pinMode(5,OUTPUT);
pinMode(2,INPUT);}

void loop(){    
switchState = digitalRead(2);

if (switchState == HIGH){
d= ~d;

if(d==LOW){
  digitalWrite(3,~switchst);
  digitalWrite(4,switchst);
  digitalWrite(5,switchst);
  delay(200);
  digitalWrite(3,switchst);
  digitalWrite(4,~switchst);
  digitalWrite(5,switchst);
  delay(200);
  digitalWrite(3,switchst);
  digitalWrite(4,switchst);
  digitalWrite(5,~switchst);
  delay(200);}

else {
  digitalWrite(3,switchst);
  digitalWrite(4,switchst);
  digitalWrite(5,~switchst);
  delay(200);
  digitalWrite(3,switchst);
  digitalWrite(4,~switchst);
  digitalWrite(5,switchst);
  delay(200);
  digitalWrite(3,~switchst);
  digitalWrite(4,switchst);
  digitalWrite(5,switchst);
  delay(200);}}}
2

You need to check when a button becomes pressed and is not just held down. This is known as a state detection and their is an example of this in the basic examples of the IDE.

Then use the state in an if statement to chose one or other blocks of code to do your blinking.