#include <LiquidCrystal_I2C.h>
#include <ArduinoJson.h>
#define Main_Page_CNT 3
#define SUB_Page1_CNT 4
#define SUB_Page2_CNT 2



LiquidCrystal_I2C lcd(0x27 , 16,4);

// setup the enum with all the menu pages options
enum pageType {Main_Page, SUBPage1, SUBPage2};

//hold which page is currently selected
enum pageType currPage = Main_Page;

// constants holding pin numbers
const int ARROW_UP = 32;
const int ARROW_DOWN = 35;
const int ENTER_MENU = 34;
const int BACKLIGHT = 33;
const int cancel = 25;




// ========================================================================
// ||                                SETUP                               ||
// ========================================================================

void setup() {
  // INIT THE SERIAL AND THE LCD
  Serial.begin(115200);
  lcd.init();

  // SETUP THE BUTTON I/O'S

 pinMode (ARROW_UP, INPUT_PULLUP);
 pinMode (ARROW_DOWN, INPUT_PULLUP);
 pinMode (ENTER_MENU, INPUT_PULLUP);
 pinMode (BACKLIGHT, INPUT_PULLUP);
  pinMode (CANCEL, INPUT_PULLUP);
  
  }




// ========================================================================
// ||                            MAIN LOOP                               ||
// ========================================================================

void loop() {
  // put your main code here, to run repeatedly:
 switch (currPage){
    case Main_Page:       page_MainPage(); break;
    case SUBPage1:        page_PumpsList(); break;
    case SUBPage2:        page_Confirm(); break;
}
}

// ========================================================================
// ||                          page_MainPage                             ||
// ========================================================================

void page_MainPage(){

//flag for updating the display
 boolean updateDisplay = true;

 // tracks when enter top of loop
 unsigned long loopStart;

 //tracks button states
boolean ARROW_UP_WasDown = false;
boolean ARROW_DOWN_WasDown = false;
boolean ENTER_MENU_WasDown = false;

// selected item pointer
 uint8_t sub_Pos = 1; 


// INNER LOOP
   while (true) {


// capture start time
  loopStart = millis();
  

// print the display
  if (updateDisplay){

// clear the update flag
  updateDisplay = false;

// clear the display
  // lcd.clear();

// print the items
      lcd.setCursor(0,0);
      printSelected(1, sub_Pos);  lcd.print("pump1 = ");
      lcd.setCursor(0,1);
      printSelected(2, sub_Pos);  lcd.print("pump2 = ");
      lcd.setCursor(0,2);
      printSelected(3, sub_Pos);  lcd.print("pump3 = ");
      lcd.setCursor(0,3);
      printSelected(4, sub_Pos);  lcd.print("pump4 = ");

  }

// CAPTURE THE BUTTON DOWN STATES
if (btnIsDown(ARROW_UP)) {ARROW_UP_WasDown = true;}
if (btnIsDown(ARROW_DOWN)) {ARROW_DOWN_WasDown = true;}
if (btnIsDown(ENTER_MENU)) {ENTER_MENU_WasDown = true;}
 
 // move the pointer down
 if (ARROW_DOWN_WasDown && btnIsUp(ARROW_DOWN)){
   if (sub_Pos == Main_Page_CNT) {sub_Pos = 1;} else {sub_Pos ++;}
   updateDisplay = true;
   ARROW_DOWN_WasDown = false;
 }

 // move the pointer up                                                //not working!!!!!!!!
/* if (ARROW_UP_WasDown && btnIsUp(ARROW_UP)){
   if (sub_Pos == SUB_Page2_CNT) {sub_Pos = 4;} else {sub_Pos --;}
   updateDisplay = true;
   ARROW_UP_WasDown = false;
 }
 */
   
// keep a specific pace
while (millis() - loopStart < 25)
{delay (2);}                               // change to wait(2)
  
   }
}



// ========================================================================
// ||                       page_PumpsList                               ||
// ========================================================================

void page_PumpsList(){

}

// ========================================================================
// ||                                SETUP                               ||
// ========================================================================

void page_Confirm() {
  
}

// ========================================================================
// ||                          TOOLS-DISPLAY                             ||
// ========================================================================

void printSelected(int p1, int p2){
  if(p1 == p2){
   // lcd.setCursor(0,0);
    lcd.print ("> ");
  }
  else{
    lcd.print("  ");
  }

}

// ========================================================================
// ||                          TOOLS-BUTTON PRESSING                             ||
// ========================================================================


boolean btnIsDown(int btn){
  return digitalRead(btn) == LOW && digitalRead(btn)== LOW;
}

boolean btnIsUp(int btn){
  return digitalRead(btn) == HIGH && digitalRead(btn)== HIGH;
}