// Libraries for OLED and Stepper
#include <Wire.h>//Used for I2C communication, which is needed to control the OLED display
#include <Adafruit_GFX.h>//These are the libraries for controlling the OLED screen. 

#include <Adafruit_SSD1306.h>//They help display text and graphics

// Define A4988 Pins
#define DIR_PIN 25//This pin controls the direction of the stepper motor (clockwise or counterclockwise).
#define STEP_PIN 26//This pin is used to generate step signals to the stepper motor driver, controlling its movement.


// OLED Display Setup
#define SCREEN_WIDTH 128//Define the size of the OLED screen
#define SCREEN_HEIGHT 64//Define the size of the OLED screen
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);//Initializes the OLED display using I2C communication.


// Motor Configuration
const int STEPS_PER_REV = 200;  //The number of steps the motor takes to complete one full revolution. // Steps per revolution
const int MOTOR_SPEED = 500;  //The delay between each step of the motor, controlling how fast the motor moves. // Step delay in microseconds

void setup() {
  // Setup Motor Pins
  pinMode(DIR_PIN, OUTPUT);//Set the motor pins as outputs.
  pinMode(STEP_PIN, OUTPUT);//Set the motor pins as outputs.

  // Initialize Serial Monitor
  Serial.begin(115200);//Starts the serial communication to output debugging or status messages to the Serial Monitor.


  // Initialize OLED Display
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {  // Directly use the I2C address 0x3C//Initializes the OLED display with the I2C address 0x3C.
    Serial.println("OLED initialization failed");
    while (true);  // Stop here if initialization fails
  }
  display.clearDisplay();//.Clears the OLED screen.
  display.setTextSize(1);//Sets the text size for the display.
  display.setTextColor(SSD1306_WHITE);//Sets the text color to white.
  display.setCursor(0, 0);// Sets the cursor position on the display to the top-left corner.
  display.println("DOOR TO STORE THE BAGGAGE");//Displays a startup message on the OLED screen
  display.display();
  delay(2000);
}

void loop() {
  // Open the Door
  displayMessage("Door is Opening...");
  digitalWrite(DIR_PIN, HIGH);  // Clockwise//It moves the motor forward to open the door
  moveStepper(STEPS_PER_REV * 5);  // Rotate the motor forward

  delay(5000);  // Wait 2 seconds

  // Close the Door
  displayMessage("Door is Closed");
  digitalWrite(DIR_PIN, LOW);  // Counterclockwise//It moves the motor backward to close it
  moveStepper(STEPS_PER_REV * 5);  // Rotate the motor backward

  delay(2000);  // Pause before next cycle
}

// Function to Move Stepper Motor
void moveStepper(int steps) {
  for (int i = 0; i < steps; i++) {
    digitalWrite(STEP_PIN, HIGH);
    delayMicroseconds(MOTOR_SPEED);
    digitalWrite(STEP_PIN, LOW);
    delayMicroseconds(MOTOR_SPEED);
  }
}

// Function to Display Messages
void displayMessage(const char* message) {
  display.clearDisplay();
  display.setCursor(0, 0);
  display.println(message);
  display.display();
  Serial.println(message);
}