#include <ezButton.h>
#include <SD.h>
File file;
int book_num=0;
int book_state=0;
int prev_book_num=-1;
ezButton next(2);
ezButton prev(3);
ezButton select_book(4);
ezButton open_book(5);




void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  SD.begin();
  next.setDebounceTime(50);
  prev.setDebounceTime(50);
  select_book.setDebounceTime(50);
  open_book.setDebounceTime(50);
  if(!SD.begin())Serial.println("SD Card Not Detected! :()");
  else Serial.println("SD Card Successfully Detected! :)");
  /*file=SD.open("harry.txt",FILE_READ);
  Serial.print("Total Characters");
  Serial.println(file.size());
  if(file){
    Serial.println("Harry Potter");
    delay(2000);
    while(file.available()){
      char data=file.read();
      Serial.print(data);
    }
    Serial.println();
    file.close();
  }
  Serial.println("File Read Successfuly!");*/

}

void loop() {
  // put your main code here, to run repeatedly:
  next.loop();
  prev.loop();
  select_book.loop();
  open_book.loop();
  if(next.isPressed()){
    book_num++;
  }
  else if(prev.isPressed()){
    book_num--;
  }
  else if (select_book.isPressed()){
    book_state=0;
    prev_book_num=-1;
  }
  else if (open_book.isPressed()){
   book_state=1;
  }
book_num=constrain(book_num,0,1);
  check_book();
  read_book();
  delay(10);
}

void check_book(){
  if(prev_book_num!=book_num){
    prev_book_num=book_num;
  if(book_num)
  Serial.print("Think & Grow Rich");
  else 
  Serial.print("Harry Potter");
  }
}

void read_book(){
  if(book_state){
    if(book_num)
    file=SD.open("think.txt",FILE_READ);
    else
    file=SD.open("harry.txt",FILE_READ);
    String display_text="";
    if(file){
      while(file.available()){
      char data=file.read();
      Serial.print(data);
      }
    }
  }
  file.close();
}