/*
  Red Button (4) not used in this case!
*/

#include <RTClib.h>
#include <U8g2lib.h>
#include <Bounce2.h>


byte button_pins[] = {23, 22, 24, 25}; // button pins, 23,22 = up/down, 24 = select, 25 = Home
#define NUMBUTTONS sizeof(button_pins)
Bounce * buttons = new Bounce[NUMBUTTONS];


U8X8_SSD1306_128X64_NONAME_HW_I2C display(U8X8_PIN_NONE);
RTC_DS1307 rtc;


#define MENU_SIZE_1 5        // Menu 1
char *menu1[MENU_SIZE_1] = { "Home", "Option 2", "Option 3", "Option 4", "Option 5" };
#define MENU_SIZE_HOME 2     // Home
char *home[MENU_SIZE_HOME] = { "Menu 1", "Option 2"};

String OPEN_MENU = "Home";
int cursor = 0;

int TARGET_TIME[] = {9, 48, 0}; // Alarm Time
int targethour = TARGET_TIME[0];
int targetminute = TARGET_TIME[1];
int targetsecond = TARGET_TIME[2];

const int LOCKSCREEN_DELAY = 1; // Delay until the lockscreen comes back in in Minutes after last Button press

void setup() {

  Serial.begin(9600); // Start Serial Monitor

  for (int i = 0; i < NUMBUTTONS; i++) {
    buttons[i].attach( button_pins[i], INPUT_PULLUP); // setup the bounce instance for the current button
    buttons[i].interval(25); // interval in ms
  }

  if ( ! display.begin()) { // Start Display
    Serial.println("Couldn't find Display");
    Serial.flush();
    abort(); // Stop the Program
  } else {
    display.setPowerSave(0);
    display.setFont(u8x8_font_pxplusibmcgathin_f);
  }

  if (! rtc.begin()) { // Start Conection to RTC
    Serial.println("Couldn't find RTC");
    Serial.flush();
    abort(); // Stop the Program
  }

  showLockScreen();

}

int hour;
int minute;
int second;

int CurrentTimecodecooldown = 0;
int CurrentTimecode = 0;

void loop() {
  DateTime now = rtc.now(); // Setting up RTC

  hour = now.hour();
  minute = now.minute();
  second = now.second();

  CurrentTimecode = hour * 60 + minute;

  if (targethour == hour && targetminute == minute && targetsecond == second) {
    Alarm();
  }

  for (int i = 0; i < NUMBUTTONS; i++) {
    buttons[i].update(); // Update the Bounce instance
    if ( buttons[i].fell() ) { // If it fell
      if (OPEN_MENU == "Lockscreen") {
        showHome(); // show Home if last window was Lockscreen
        CurrentTimecodecooldown = CurrentTimecode + LOCKSCREEN_DELAY; // Update Delay
      } else { // Do not execute the buttons  when the menu is not showen
        CurrentTimecodecooldown = CurrentTimecode + LOCKSCREEN_DELAY; // Update Delay
        if (i == 3) {
          if (OPEN_MENU != "Home") {
            showHome(); // show Home if it is not already open
          }
        }
        else if (i == 2) {
          // goto select
          button_select();
        } else {
          // erase previous cursor:
          display.setCursor(0, cursor);
          display.print(' ');
          if (i == 0) { // up
            button_up();
          }
          else { // down
            button_down();
          }
          // show cursor at new line:
          display.setCursor(0, cursor);
          display.print('>');
        }
      }
    } else if (CurrentTimecodecooldown <= CurrentTimecode && OPEN_MENU != "Lockscreen") {
      showLockScreen(); // Show Lockscreen
    }
  }
}



void button_select() {

  if ( OPEN_MENU == "Home") {

    //execute choise
    if (cursor == 0) {
      showMenu1();
    }

    //print selection
    display.clearLine(7);
    display.setCursor(0, 7);
    display.print(">>");
    display.print(home[cursor]);

  } else if (OPEN_MENU == "Menu_1") {

    // execute choice
    if (cursor == 0) {
      showHome();
    }//else if (cursor == 1) {}

    display.clearLine(7);
    display.setCursor(0, 7);
    display.print(">>");
    display.print(menu1[cursor]);
  }
}
void button_up() {
  cursor++;
  if (OPEN_MENU == "Home") {
    if (cursor > (MENU_SIZE_HOME - 1)) cursor = 0;
  } else if (OPEN_MENU == "Menu_1") {
    if (cursor > (MENU_SIZE_1 - 1)) cursor = 0;
  }
}
void button_down() {
  cursor--;
  if (OPEN_MENU == "Home") {
    if (cursor < 0) cursor = (MENU_SIZE_HOME - 1);
  } else if (OPEN_MENU == "Menu_1") {
    if (cursor < 0) cursor = (MENU_SIZE_1 - 1);
  }
}

// Menus (OLED - Display)
void showMenu1() {
  display.clearDisplay();
  Serial.println("Opening Menu1");
  OPEN_MENU = "Menu_1";
  // show menu items:
  for (int i = 0; i < MENU_SIZE_1; i++) {
    display.drawString(2, i, menu1[i]);
  }
  display.setCursor(0, 0);
  display.print('>');
}
void showHome() {
  display.clearDisplay();
  Serial.println("Opening Home");
  OPEN_MENU = "Home";
  // show menu items:
  for (int i = 0; i < MENU_SIZE_HOME; i++) {
    display.drawString(2, i, home[i]);
  }
  display.setCursor(0, 0);
  display.print('>');
}
void showLockScreen() {
  display.clearDisplay();
  Serial.println("Opening Lockscreen");
  OPEN_MENU = "Lockscreen";
  cursor = 0;
  display.setCursor(2, 2);
  display.print("Hey,");
  display.setCursor(2, 3);
  display.print("How are You?");
}
void Alarm() {
  Serial.print("Alarm");
  display.clearDisplay();
  OPEN_MENU = "Alarm";
  display
}