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In the beginning, the code starts by identifying the stepper, variables, and sensors.
Then, the code initializes the serial port. 
After that, the code starts with the if statements. The code asks the stepper to rotate in a certain direction at a certain speed depending on the value the light sensor measures.
So basically, the stepper closes if there is no light and opens depending on the light intensity.

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CODE

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#include <Stepper.h>

  // change this to fit the number of steps per revolution

// for your motor
int stepsPerRevolution=32;
const int sensorpin = 0;
int execute=0;
int execute1=0;
int execute2=0;
int execute3=0;
int execute4=0;
int lightcal;
Stepper myStepper(stepsPerRevolution, 8, 10, 9, 11);

// initialize the stepper library pins:

void setup() {
 
 
  // initialize the serial port:
  Serial.begin(9600);
}

void loop() {
  // step one revolution  in one direction:
  lightcal = analogRead(sensorpin);
  delay(500);
   Serial.println(lightcal);
   if(lightcal <250 && lightcal>100 && execute==0){
    stepsPerRevolution = 150;
   //Stepper myStepper(stepsPerRevolution, 8, 9, 10, 11);
   myStepper.setSpeed(100);
   myStepper.step(stepsPerRevolution);
   Serial.println("clockwise");
   execute++;
   }
   if(lightcal<500 && lightcal>250 && execute1==0){
    
   stepsPerRevolution = 150;
   myStepper.setSpeed(100);
   myStepper.step(stepsPerRevolution);
   Serial.println("clockwise");
   execute1++;
    }
    if(lightcal<750 && lightcal>500 && execute2==0){
    
   stepsPerRevolution = 150;
   myStepper.setSpeed(100);
   myStepper.step(stepsPerRevolution);
   Serial.println("clockwise");
   execute2++;
    }
    if(lightcal<1023 && lightcal>750 && execute3==0){
    
   stepsPerRevolution = 150;
   myStepper.setSpeed(100);
   myStepper.step(stepsPerRevolution);
   Serial.println("clockwise");
   execute3++;
    }
    
   if(lightcal<100 ){
   Serial.println("counterclockwise");
   int steps=450;
   myStepper.step(-steps);
   delay(500);
 
    }