/*
Autore: Ivan Selva
Data 0430/03/2023
Nome: Progetto: prove di menù
Scopo: Provare a creare un menu 
*/

#include <Adafruit_SSD1306.h>
#include <Adafruit_GFX.h>
#include <SPI.h>
#include <Wire.h>
#include "displayshield.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);

int stato = 0;
bool FIRST = true;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600); // attivo il monitor seriale
  
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C); // avvio il display oled
  display.display(); // visualizzio 
  Serial.println("CIAO");

}

void loop() {
  // put your main code here, to run repeatedly:
  switch(stato) {
    case 0:
      mainloop();
    break;
    case 10:
      mainmenu1();
    break;
    case 20:
      mainmenu2();
    break;
    case 30:
      mainmenu3();
    break;
    case 40:
      mainmenuexit();
    break;
    case 100:
      sub1();
    break;
  }
}

void setStato(int s){
  stato = s;
  FIRST = true;
  int stato = 0;
  display.clearDisplay();
  display.display();
  delay(300);
}

void mainloop() {
  if (FIRST) {
    display.print("running");
    display.setCursor(0,1);
    display.print("S:menu");
    display.display();  
    Serial.println("running");
    FIRST = false;
  }

  int key = readKeys();
  switch (key) {
    case KY_SEL:
      setStato(10);
    break;
  }
}

void mainmenu1() {
  if (FIRST) {
    display.print("menu 1");
    display.setCursor(0,1);
    display.print("DN:next R:sub1");
    display.display();
    Serial.println("menu 1");  
    FIRST = false;
  }

  int key = readKeys();
  switch (key) {
    case KY_DOWN:
      setStato(20);
    break;
    case KY_RIGHT:
      setStato(100);
    break;
  }  
}

void mainmenu2() {
 if (FIRST) {
    display.print("menu 2");
    display.setCursor(0,1);
    display.print("DN:next");
    display.display();
    Serial.println("menu 2");
    FIRST = false;
  }

  int key = readKeys();
  switch (key){
    case KY_DOWN:    
      setStato(30);
      break;          
  }  
}
void mainmenu3() {
  if (FIRST) {
    display.print("menu 3");
    display.setCursor(0,1);
    display.print("DN:next");
    display.display();
    Serial.println("menu 3");
    FIRST = false;
  }

  int key = readKeys();
  switch (key){
    case KY_DOWN:    
      setStato(40);
      break;          
  }   
}

void mainmenuexit() {
  if (FIRST) {
    display.print("exit menu?");
    display.setCursor(0,1);
    display.print("DN:next S:back");
    display.display();
    Serial.println("menu exit");
    FIRST = false;
  }

  int key = readKeys();
  switch (key){
    case KY_DOWN:    
      setStato(10);
      break;          
    case KY_SEL:    
      setStato(0);
      break;          
  }   
}

int x = 0;

void sub1() {
  if (FIRST) {
    display.print("sub1 x=");
    display.setCursor(7,0);
    display.print(x);
    display.setCursor(0,1);
    display.print("L:back U/D:chg");
    display.display();
    Serial.println("menu sub1");
    FIRST = false;
  }

  int key = readKeys();
  switch (key){
    case KY_LEFT:    
      setStato(10);
      break;          
    case KY_UP:    
      x++;
      display.setCursor(7,0);
      display.print("    ");
      display.setCursor(7,0);
      display.print(x);
      display.display();
      delay(100);
      break;          
    case KY_DOWN:    
      x--;
      display.setCursor(7,0);
      display.print("    ");
      display.setCursor(7,0);
      display.print(x);
      display.display();
      delay(100);
      break;          
  }    
}