// for the display
#include <Wire.h> //wire library responsible for the I2C communication
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

// for the display
#define SCREEN_WIDTH 128 //OLED display width in pixels
#define SCREEN_HEIGHT 64 //OLED dispaly height in pixels
#define OLED_RESET -1 //reset pin for the display is same as the esp32 board
#define SCREEN_ADDRESS 0x3C //see datasheet for the adddress //this is I3C address of the OLED display

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET); //creating a object for the OLED display
//we have to specify screen width, screen height, wire libry and reset pin

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600); //initialize the serial communication

  //to initialize the oled display we are using the begin function
  //the input we have to provide in the documentation of the libry
  //then we have to give the address of the display
  if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); //dont proceed loop forever
  }
  //if clause is there to show us whether the oled is display is initialized properly
  //exclamation mark is logical not operator
  //when the display is not properly initialized the condition will become false and print the line 
  //because of the infinite for loop without any input...so the code will not execute beyond when the oled isplay is not working.


  //show initial display buffer contents on the screen
  //the library initializes this with an adafruit splash screen
  display.display();
  delay(2000); //pause for 3 seconds

  //clear the buffer 
  //buffer is like the logo of the company
  display.clearDisplay(); //here we are starting the display

  display.setTextSize(1); //adding a text size for the display
  display.setTextColor(SSD1306_WHITE); //adding a text color
  display.setCursor(0,0); //getting the cursor to the origin
  display.println(F("welcome to medibox"));
  display.display();
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
}