// simple project using Arduino UNO and 128x64 OLED Display to display a menu
// created by upir, 2022
// youtube channel: https://www.youtube.com/upir_upir

// YOUTUBE VIDEO: https://youtu.be/HVHVkKt-ldc


#include "U8g2lib.h"
//U8G2_SSD1306_128X32_UNIVISION_1_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);   // Adafruit ESP8266/32u4/ARM Boards + FeatherWing OLED
U8G2_SSD1306_128X64_NONAME_1_HW_I2C u8g2(U8G2_R0, U8X8_PIN_NONE);
//U8G2_SSD1306_128X64_NONAME_1_2ND_HW_I2C u8g2(U8G2_R0, U8X8_PIN_NONE);
//U8X8_SSD1306_128X64_NONAME_HW_I2C display(U8X8_PIN_NONE);


// all the arrays below are generated from images using image2cpp website
// scroll down to see the actual code


// 'icon_3dcube', 16x16px
const unsigned char bitmap_icon_3dcube []  = {
  0x00, 0x00, 0x01, 0x80, 0x07, 0x60, 0x19, 0x18, 0x61, 0x06, 0x51, 0x0a, 0x45, 0xa2, 0x41, 0x02, 
  0x45, 0x22, 0x41, 0x02, 0x45, 0xa2, 0x51, 0x0a, 0x61, 0x06, 0x19, 0x18, 0x07, 0x60, 0x01, 0x80
};
// 'icon_battery', 16x16px
const unsigned char bitmap_icon_battery []  = {
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xf8, 0x40, 0x04, 0x5b, 0x66, 0x5b, 0x66, 
  0x5b, 0x66, 0x40, 0x04, 0x3f, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
// 'icon_dashboard', 16x16px
const unsigned char bitmap_icon_dashboard []  = {
  0x07, 0xe0, 0x18, 0x18, 0x21, 0x24, 0x50, 0x02, 0x48, 0x0a, 0x84, 0x01, 0x83, 0x81, 0xa2, 0x45, 
  0x82, 0x41, 0x81, 0x81, 0xa0, 0x05, 0x40, 0x02, 0x4b, 0xd2, 0x23, 0xc4, 0x18, 0x18, 0x07, 0xe0
};
// 'icon_fireworks', 16x16px
const unsigned char bitmap_icon_fireworks []  = {
  0x00, 0x00, 0x00, 0x08, 0x00, 0x94, 0x10, 0x08, 0x10, 0x00, 0x6c, 0x00, 0x10, 0x10, 0x10, 0x10, 
  0x00, 0x00, 0x00, 0xc6, 0x00, 0x00, 0x00, 0x10, 0x04, 0x10, 0x0a, 0x00, 0x04, 0x00, 0x00, 0x00
};
// 'icon_gps_speed', 16x16px
const unsigned char bitmap_icon_gps_speed []  = {
  0x00, 0x00, 0x03, 0xf0, 0x00, 0x08, 0x01, 0xe4, 0x00, 0x12, 0x00, 0xca, 0x06, 0x2a, 0x07, 0x2a, 
  0x07, 0x8a, 0x07, 0xc2, 0x07, 0xc0, 0x0a, 0x00, 0x1f, 0x00, 0x20, 0x80, 0x7f, 0xc0, 0x00, 0x00
};
// 'icon_knob_over_oled', 16x16px
const unsigned char bitmap_icon_knob_over_oled []  = {
  0x00, 0x00, 0x1f, 0xf0, 0x13, 0x50, 0x1b, 0xb0, 0x11, 0x50, 0x1f, 0xf0, 0x03, 0x80, 0x01, 0x00, 
  0x00, 0x00, 0x09, 0x20, 0x49, 0x24, 0x20, 0x08, 0x00, 0x01, 0x80, 0x02, 0x00, 0x00, 0x00, 0x00
};
// 'icon_parksensor', 16x16px
const unsigned char bitmap_icon_parksensor []  = {
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfc, 0x00, 0x22, 0x00, 0x25, 0x00, 0xf9, 0x00, 0x00, 0x81, 
  0x0c, 0x85, 0x12, 0x95, 0xd2, 0x95, 0x0c, 0x05, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
// 'icon_turbo', 16x16px
const unsigned char bitmap_icon_turbo []  = {
  0x00, 0x0e, 0x07, 0xf1, 0x18, 0x01, 0x20, 0x01, 0x40, 0x01, 0x43, 0xf1, 0x84, 0x4e, 0x8a, 0xa0, 
  0x89, 0x22, 0x8a, 0xa2, 0x84, 0x42, 0x43, 0x84, 0x40, 0x04, 0x20, 0x08, 0x18, 0x30, 0x07, 0xc0
};

// Array of all bitmaps for convenience. (Total bytes used to store images in PROGMEM = 384)
const unsigned char* bitmap_icons[8] = {
  bitmap_icon_3dcube,
  bitmap_icon_battery,
  bitmap_icon_dashboard,
  bitmap_icon_fireworks,
  bitmap_icon_gps_speed,
  bitmap_icon_knob_over_oled,
  bitmap_icon_parksensor,
  bitmap_icon_turbo
};





// 'scrollbar_background', 8x64px
const unsigned char bitmap_scrollbar_background []  = {
  0x00, 0x02, 0x00, 0x02, 0x00, 0x02, 0x00, 0x02, 0x00, 0x02, 0x00, 0x02, 0x00, 0x02, 0x00, 0x02, 
  0x00, 0x02, 0x00, 0x02, 0x00, 0x02, 0x00, 0x02, 0x00, 0x02, 0x00, 0x02, 0x00, 0x02, 0x00, 0x02, 
  0x00, 0x02, 0x00, 0x02, 0x00, 0x02, 0x00, 0x02, 0x00, 0x02, 0x00, 0x02, 0x00, 0x02, 0x00, 0x02, 
  0x00, 0x02, 0x00, 0x02, 0x00, 0x02, 0x00, 0x02, 0x00, 0x02, 0x00, 0x02, 0x00, 0x02, 0x00, 0x00
};

// 'item_sel_outline', 128x21px
const unsigned char bitmap_item_sel_outline []  = {
  0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 
  0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 
  0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 
  0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 
  0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 
  0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 
  0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 
  0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 
  0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 
  0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 
  0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 
  0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 
  0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 
  0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 
  0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 
  0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 
  0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 
  0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 
  0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 
  0x3f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 
  0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0
};



// ------------------ end generated bitmaps from image2cpp ---------------------------------



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" }
 };
// note - when changing the order of items above, make sure the other arrays referencing bitmaps
// also have the same order, for example array "bitmap_icons" for icons, and other arrays for screenshots and QR codes

#define BUTTON_UP_PIN 5 // pin for UP button 
#define BUTTON_SELECT_PIN 6 // pin for SELECT button
#define BUTTON_DOWN_PIN 9 // pin for DOWN button



int button_up_clicked = 0; // only perform action when button is clicked, and wait until another press
int button_select_clicked = 0; // same as above
int button_down_clicked = 0; // same as above

int item_selected = 0; // which item in the menu is selected

int item_sel_previous; // previous item - used in the menu screen to draw the item before the selected one
int item_sel_next; // next item - used in the menu screen to draw next item after the selected one

int current_screen = 0;   // 0 = menu, 1 = screenshot, 2 = qr



void setup() {
  u8g2.begin();
  u8g2.setPowerSave(0);
  u8g2.setColorIndex(1);  // set the color to white

  // define pins for buttons
  // INPUT_PULLUP means the button is HIGH when not pressed, and LOW when pressed
  // since it´s connected between some pin and GND
  pinMode(BUTTON_UP_PIN, INPUT_PULLUP); // up button
  pinMode(BUTTON_SELECT_PIN, INPUT_PULLUP); // select button
  pinMode(BUTTON_DOWN_PIN, INPUT_PULLUP); // down button

  
  
}


void loop() {

  
  if (current_screen == 0) { // MENU SCREEN

      // up and down buttons only work for the menu screen
      if ((digitalRead(BUTTON_UP_PIN) == LOW) && (button_up_clicked == 0)) { // up button clicked - jump to previous menu item
        item_selected = item_selected - 1; // select previous item
        button_up_clicked = 1; // set button to clicked to only perform the action once
        if (item_selected < 0) { // if first item was selected, jump to last item
          item_selected = NUM_ITEMS-1;
        }
      }
      else if ((digitalRead(BUTTON_DOWN_PIN) == LOW) && (button_down_clicked == 0)) { // down button clicked - jump to next menu item
        item_selected = item_selected + 1; // select next item
        button_down_clicked = 1; // set button to clicked to only perform the action once
        if (item_selected >= NUM_ITEMS) { // last item was selected, jump to first menu item
          item_selected = 0;
          }
      } 

      if ((digitalRead(BUTTON_UP_PIN) == HIGH) && (button_up_clicked == 1)) { // unclick 
        button_up_clicked = 0;
      }
      if ((digitalRead(BUTTON_DOWN_PIN) == HIGH) && (button_down_clicked == 1)) { // unclick
        button_down_clicked = 0;
      }

  }


  if ((digitalRead(BUTTON_SELECT_PIN) == LOW) && (button_select_clicked == 0)) { // select button clicked, jump between screens
     button_select_clicked = 1; // set button to clicked to only perform the action once
     if (current_screen == 0) {current_screen = 1;} // menu items screen --> screenshots screen
     else if (current_screen == 1) {current_screen = 2;} // screenshots screen --> qr codes screen
     else {current_screen = 0;} // qr codes screen --> menu items screen
  }
  if ((digitalRead(BUTTON_SELECT_PIN) == HIGH) && (button_select_clicked == 1)) { // unclick 
    button_select_clicked = 0;
  }

  // set correct values for the previous and next items
  item_sel_previous = item_selected - 1;
  if (item_sel_previous < 0) {item_sel_previous = NUM_ITEMS - 1;} // previous item would be below first = make it the last
  item_sel_next = item_selected + 1;  
  if (item_sel_next >= NUM_ITEMS) {item_sel_next = 0;} // next item would be after last = make it the first


  u8g2.firstPage(); // required for page drawing mode for single buffer u8g2 library
  do {

    if (current_screen == 0) { // MENU SCREEN

      // selected item background
      u8g2.drawBitmap(0, 22, 128/8, 21, bitmap_item_sel_outline);

      // draw previous item as icon + label
      u8g2.setFont(u8g2_font_helvR08_tf);
      u8g2.drawStr(25, 15, menu_items[item_sel_previous]); 
      u8g2.drawBitmap( 4, 2, 16/8, 16, bitmap_icons[item_sel_previous]);          

      // draw selected item as icon + label in bold font
      u8g2.setFont(u8g2_font_helvB08_tf);    
      u8g2.drawStr(25, 15+20+2, menu_items[item_selected]);   
      u8g2.drawBitmap( 4, 24, 16/8, 16, bitmap_icons[item_selected]);     

      // draw next item as icon + label
      u8g2.setFont(u8g2_font_helvR08_tf);     
      u8g2.drawStr(25, 15+20+20+2+2, menu_items[item_sel_next]);   
      u8g2.drawBitmap( 4, 46, 16/8, 16, bitmap_icons[item_sel_next]);  

      // draw scrollbar background
      u8g2.drawBitmap(128-8, 0, 8/8, 64, bitmap_scrollbar_background);

      // draw scrollbar handle
      u8g2.drawBox(125, 64/NUM_ITEMS * item_selected, 3, 64/NUM_ITEMS); 

    } 
    else if (current_screen == 1) { // Function Screen(was SCREENSHOTS SCREEN)
      u8g2.drawStr(0,29, "do function");
       // u8g.drawBitmapP( 0, 0, 128/8, 64, bitmap_screenshots[item_selected]); // draw screenshot
    }
    else if (current_screen == 2) { // Sleep screen (was QR SCREEN)
      //u8g2.clearDisplay();
      //  u8g.drawBitmapP( 0, 0, 128/8, 64, bitmap_qr_codes[item_selected]); // draw qr code screenshot
    }   

  } while ( u8g2.nextPage() ); // required for page drawing mode with single buffer u8g2 library


}