#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

//DISP
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");

  // initialize with the I2C addr 0x3C (for the 128x64)
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }

  // Clear the buffer
  display.clearDisplay();

  // Display text
  display.setTextSize(1);      // Normal 1:1 pixel scale
  display.setTextColor(SSD1306_WHITE); // White text
  display.setCursor(0,0);     // Start at top-left corner

  display.println("StockApp");
  display.display();
}

int randomNum(){
  return random(10000000,99999999);        
}


void loop() {
  // put your main code here, to run repeatedly:
  delay(2000); // this speeds up the simulation

    // Clear the buffer
  display.clearDisplay();

  // Display text
  display.setTextSize(1);      // Normal 1:1 pixel scale
  display.setTextColor(SSD1306_WHITE); // White text
  display.setCursor(0,0);     // Start at top-left corner
  
  int code = randomNum();
  String full = "https://ge.fi/secure?l=" + String(code);
  display.println(full);
  const char* fullChar = full.c_str();

  display.display();

}