/*
  Basic Menu for 0.96 I2C OLED displays on Arduino.
*/

#include <Button.h>
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h> 
#include <Fonts/FreeSans9pt7b.h>
//#include <Fonts/FreeSans12pt7b.h>

// make sure the you choose the correct address for your display
#define OLED_ADDR   0x3C
#define OLED_RESET 4
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

Button upBtn(12); // Pin 12
Button selectBtn(3); // Pin 3
Button downBtn(11); // Pin 11

//new manu
const int NUM_ITEMS = 8; // number of items in the list and also the number of screenshots and screenshots with QR codes (other screens)
const int MAX_ITEM_LENGTH = 20; // maximum characters for the item name

char menu_items [NUM_ITEMS] [MAX_ITEM_LENGTH] = {  // array with item names
  { "3D Cube" }, 
  { "Battery" }, 
  { "Dashboard" }, 
  { "Fireworks" }, 
  { "GPS Speed" }, 
  { "Big Knob" },   
  { "Park Sensor" }, 
  { "Turbo Gauge" }
 };


byte menuSelected = 0;
#define MENU_HEIGHT 3 // number of lines in menu
byte shiftMenu=0;

void setup() {
  // setup buttons
	upBtn.begin();
	selectBtn.begin();
	downBtn.begin();
	
	// setup display
	Serial.begin(9600);
  display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR);
  display.display();
  display.clearDisplay(); 
}

void loop() {
  // updates display based on input from the buttons
  getButtonInput();
  showMenu();
  //menuInteract();
  display.clearDisplay();
}

void showMenu() {
  // change text display here
  display.setTextSize(2);
  display.setTextColor(WHITE);

  display.setCursor(10, 0);
  // menu title
  display.println("Menu Test");
  //---------------------------------
  display.setTextSize(1);
  // display menu items
  for (int i=0; i<MENU_HEIGHT; i++)
   {
    display.setCursor(10, (2+i)*10);
    if (i == menuSelected) {
      display.print(">"); // Display ">" before the selected menu item
      display.print(menu_items[i+shiftMenu]);
      display.println("<"); // Display "<" at the end of the line
    } else {
      display.print(" ");
      display.print(menu_items[i+shiftMenu]);
      display.println(" ");
    }
   }
  display.display();
}


void getButtonInput() {
  // handles menu scrolling

	if (downBtn.pressed()) {
    if (menuSelected==0){
      menuSelected++;
    } else {
      if (menuSelected>0 and shiftMenu<5){
        shiftMenu++;
      } else {
        if (menuSelected<2){
          menuSelected++;
        }
      }
      }
  }

  if (upBtn.pressed()) {
    if (menuSelected==2){
      menuSelected--;
    } else {
      if (menuSelected<2 and shiftMenu>0){
        shiftMenu--;
      } else {
        if (menuSelected>=1){
          menuSelected--;
        } 
      }
      }
  }
	

	if (selectBtn.pressed()) {
    Serial.println("select");
    Serial.println(menu_items[menuSelected+shiftMenu] + String(menuSelected+shiftMenu));
    if (menuSelected == 1)
    // menu item 1 clicked
    function_one();
    else if (menuSelected == 2)
    // menu item 2 clicked
    function_two();
    else if (menuSelected == 3)
    // menu item 2 clicked
    function_three();
    else if (menuSelected == 4)
    // menu item 3 clicked
    function_four();
    
  }
}

void function_one() {
  // insert fuction code form menu item 1 here
  Serial.println('Function 1 Ffffiring;');
}

void function_two() {
  // insert fuction code form menu item 2 here
  Serial.println('Function 2 Firing;');
}

void function_three() {
  // insert fuction code form menu item 3 here
  Serial.println('Function 3 Firing;');
}

void function_four() {
  // insert fuction code form menu item 4 here
  Serial.println('Function 4 Firing;');
}