// LCD MANAGEMENT WITH https://github.com/duinoWitchery/hd44780/tree/master
#include <Wire.h>
#include <hd44780.h>                       // main hd44780 header
#include <hd44780ioClass/hd44780_I2Cexp.h> // i2c expander i/o class header
hd44780_I2Cexp lcd;

const int LCD_COLS = 16;
const int LCD_ROWS = 2;

// RTC MANAGEMENT WITH https://github.com/adafruit/RTClib
#include <RTClib.h>
RTC_DS1307 rtc;


// BUTTON MANAGEMENT WITH https://github.com/Dlloydev/Toggle
#include <Toggle.h>


struct Button {
  char * name;
  byte pin;
  Toggle button;
  Button(const char * n, const byte p) : name(n), pin(p), button(p) {}
  void begin() {
    button.begin(pin);
  }
};

enum {SELECT, LEFT, UP, DOWN, RIGHT, RESET}; // the indexes in the buttons array

Button buttons[] = {
  {"select", 4},
  {"left", 5},
  {"up", 6},
  {"down", 7},
  {"right", 8},
  {"reset", 9}
};

enum {STANDARD, CONFIG} mode = STANDARD;
DateTime configDate;

void configure() {
  for (auto&b : buttons) b.begin();
  Serial.begin(115200);

  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    abort();
  }

  int result = lcd.begin(LCD_COLS, LCD_ROWS);
  if (result) {
    Serial.print("LCD initialization failed: ");
    Serial.println(result);
    hd44780::fatalError(result);
  }

}

void displayTime() {
  static char prevTime[9]; // "HH:MM:SS";
  static char prevDate[9]; // "HH:MM:SS";
  char currentTime[9]; // "HH:MM:SS";
  char currentDate[9]; // "DD/MM/YY";
  DateTime now = rtc.now();

  snprintf(currentTime, sizeof currentTime, "%02:%02:%02", now.hour(), now.minute(), now.second());
  snprintf(currentDate, sizeof currentDate, "%02/%02/%02", now.day(), now.month(), now.year());
    Serial.print(currentTime); Serial.write(' '); Serial.println(prevTime);

  if (strcmp(currentTime, prevTime) != 0) {
    lcd.setCursor(0, 0);
    lcd.print(currentTime);
    strcpy(currentTime, prevTime);
  }
  
  if (strcmp(currentDate, prevDate) != 0) {
    lcd.setCursor(0, 1);
    lcd.print(currentDate);
    strcpy(currentDate, prevDate);
  }
}

void poll() {
  for (auto&b : buttons) b.button.poll();
}

void setup() {
  configure();
}

void loop() {
  poll();
  if (mode == STANDARD) {
    displayTime();
    if (buttons[SELECT].button.onPress()) {
      configDate = rtc.now();
      lcd.setCursor(1, 0); // blink cursor under hour
      lcd.blink();
      mode = CONFIG;
    }
    else if (mode == CONFIG) {

    }
    else {
      // we will never get there

    }


    for (auto&b : buttons) {
      if (b.button.onPress()) {
        Serial.print(b.name);
        Serial.println(" pressed.");
      }

      if (b.button.onRelease()) {
        Serial.print(b.name);
        Serial.println(" released.");
      }
    }

  }
}