#include <Wire.h>
#include "SdFat.h"
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128 // OLED display width,  in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define SPI_SPEED SD_SCK_MHZ(4)
#define CS_PIN 4

SdFat sd;

Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

void bootscreen(int,int);

const int button1 = 3,
button2 = 5,
button3 = 6;

class modes{

private: 

float grades[21];

void webAssign (int pause){


}


public: 


};


void setup() {
  // put your setup code here, to run once:
  if (!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
  Serial.println(F("SSD1306 allocation failed"));
  while (true);
 
}

 Serial.begin(115200);
  if (!sd.begin(CS_PIN, SPI_SPEED)) {
    if (sd.card()->errorCode()) {
      Serial.println("SD initialization failed.");
    } else if (sd.vol()->fatType() == 0) {
      Serial.println("Can't find a valid FAT16/FAT32 partition.");
    } else {
      Serial.println("Can't determine error type");
    }
    return;
  }

  Serial.println("Files on card:");
  Serial.println("   Size    Name");

  sd.ls(LS_R | LS_SIZE);
bootscreen(50,6);
Serial.begin(9600);

pinMode(button1, INPUT);
pinMode(button2, INPUT);
pinMode(button3, INPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
int button1State = digitalRead(button1);
int button2State = digitalRead(button2);
int button3State = digitalRead(button3);


Serial.print("Button 1: ");
Serial.print(button1State);
Serial.print("    ");
Serial.print("Button 2: ");
Serial.print(button2State);
Serial.print("    ");
Serial.print("Button 3: ");
Serial.print(button3State);
Serial.println("    ");


}




void bootscreen(int x, int size){

delay(2000);         // wait for initializing
  oled.clearDisplay(); // clear display

  oled.setTextSize(3);          // text size
  oled.setTextColor(WHITE);     // text color
  oled.setCursor(0, 10);        // position to display
  oled.println("Hello,");
  oled.println("Booting"); // text to display
  oled.display();               // show on OLED
  delay(1000);
  oled.clearDisplay();
  oled.setTextSize(5); 

  for(int i = 0; i < 5; i++){
  oled.setCursor(0, 0);
  for(int i = 0; i < 4; i++){ 
  oled.print(".");
  oled.display(); 
  delay(x);
  }
delay(10);
oled.clearDisplay();   


}
}