#include <Bounce2.h>
const byte m1 = 4;
const byte m2 = 3;
const byte s1 = 7;
const byte s2 = 8;
const byte trigger = 11;    //set trigger to a switch just for example purpose. its originally going to be trigger by time
bool s1State;
bool s2State;
bool triggerState;
bool prevS1State = 0;
bool prevS2State = 0;
bool startMotor = 0;

bool wasGoingLeft;
bool wasGoingRight;
bool motorStopped;

bool high = LOW; //since ONLY switches are inverted. when its low. it will be high
bool low = HIGH;

Bounce debouncer1 = Bounce();
Bounce debouncer2 = Bounce();
Bounce debouncer3 = Bounce();  //trigger for motor

void setup() {
  // put your setup code here, to run once

  pinMode(m1, OUTPUT);
  pinMode(m2, OUTPUT);

  pinMode(s1, INPUT_PULLUP);
  debouncer1.attach(s1);
  debouncer1.interval(25);

  pinMode(s2, INPUT_PULLUP);
  debouncer2.attach(s2);
  debouncer2.interval(25);

  pinMode(trigger, INPUT_PULLUP);
  debouncer3.attach(trigger);
  debouncer3.interval(25);

  Serial.begin(9600);
  //assuming motor is already one one switch
  wasGoingRight = true;
  wasGoingLeft =false;
  delay(2000);


}

void loop() {
  // put your main code here, to run repeatedly:
  Serial.println("in loop");
  bool m1State = digitalRead(m1);
  bool m2State = digitalRead(m2);

  debouncer1.update();
  debouncer2.update();
  debouncer3.update();

  triggerState = debouncer3.read(); //trigger
  s1State = debouncer1.read();   //switch are input pullup. high state is zero
  s2State = debouncer2.read();



  if(debouncer3.fell()) //when trigger button is pressed
   {
    startMotor = true;
    Serial.println("button to trigger start motor has been presssed");
   }
   if(startMotor)
      {

         if(wasGoingLeft) {
          goRight();
          delay(2000);  //wait for both of the switches to be released
          if(s1State == low || s2State == low) {    //if it touches one of the switches
            stopMotor();
            wasGoingRight = true; //to remember next time that it was originally going right
            startMotor = false;  //to get out of function and continue loop
          }

         if(wasGoingRight) {
          goLeft();
          delay(2000);  //wait for both of the switches to be released
          if(s1State == low || s2State == low) {    //if it touches one of the switches
            stopMotor();
            wasGoingLeft = true; //to remember next time that it was originally going right
            startMotor = false;
           }
          }
        }
      }
}

//---------------functions

   void goLeft() {
    digitalWrite(m1, HIGH);
    digitalWrite(m2, LOW);
    Serial.println("going left");
    wasGoingLeft = true;
    wasGoingRight = false;
   }

   void goRight() {
    digitalWrite(m1, LOW);
    digitalWrite(m2, HIGH);
     Serial.println("going right");
     wasGoingLeft = false;
     wasGoingRight = true;
   }

   void stopMotor() {
    digitalWrite(m1, LOW);
    digitalWrite(m2, LOW);
     Serial.println("motor stopped");
     motorStopped = true;
   }