/* Arduino UNO with SSD1306 128x64 I2C OLED display
 * Buttons and function test
 * Martijn May 2024
 */

#include <Wire.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

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
#define OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// Define button pins
#define UP_BUTTON 46
#define DOWN_BUTTON 50
#define LEFT_BUTTON 52
#define RIGHT_BUTTON 48

//Define menu counts
#define menuoptions 4
#define menuitemlen 15
#define lcd_lines 2
const menuitem menu_lines[menuoptions]=
 {{"First menu lin", 0, 1},
  {"Second menu li", 0, lcd_lines},
  {"Third menu lin", 1, lcd_lines},
  {"Fourth menu li", 2, lcd_lines}};

menuitem *menu_lines_ptr;
signed char menu_position;
char user_choice;
int pressed;

void show() { // Often used sequence - Function to simplify code
  display.display(); delay(2000); display.fillScreen(SSD1306_BLACK);
}
void setup() {
  Serial.begin(9600);
  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Old Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }
  
// Initialise variables
  int x0 = 5; // 3 pairs of co-ordinates
  int y0 = 5;
  int x1 = 120;
  int y1 = 23;
  int x2 = 55;
  int y2 = 60;
  int w = 105; // width
  int h = 55;  // height
  int r = 25;  // radius
  int cw = SSD1306_WHITE; // colour white
  int cb = SSD1306_BLACK; // colour black
  int wait = 2000; // 2 second delay
  
// Title screen
  display.clearDisplay();
  display.setTextSize(1);             // Normal 1:1 pixel scale
  display.setTextColor(cw);
  display.setCursor(00,00);
  display.println("HOME");
  display.setCursor(33,00);
  display.println("MEN1");
  display.setCursor(66,00);
  display.println("MEN2");
  display.setCursor(99,00);
  display.println("MEN3");
  display.display(); delay(wait);



}


void loop() {
  // put your main code here, to run repeatedly:

//Button state
{
  bool update_needed = false;
  unsigned long time = millis();
 
  static bool up_state = false;
  static bool down_state = false;
  static bool left_state = false;
  static bool right_state = false;  

  up_state |= (digitalRead(UP_BUTTON) == LOW);
  down_state |= (digitalRead(DOWN_BUTTON) == LOW);
  left_state |= (digitalRead(LEFT_BUTTON) == LOW);
  right_state |= (digitalRead(RIGHT_BUTTON) == LOW);
}
if(digitalRead(1) == true){
  //vul hier de code in die moet draaien wanneer de knop niet is ingedrukt
}else{
  //vul hier de code in die moet draaien wanneer de knop wel is ingedrukt
}
{
  pressed = Number_of_Button();
  if (pressed > 0) user_choice = User_Menu(pressed);
  switch (user_choice)
  {
    case 1:
      //actie 1
      break;
    case 2:
      //actie 2
      break;
    case 3:
      //actie 3
      break;
    case 4:
      //actie 4
      break;
  }
}