#include <LiquidCrystal.h>
#include <Keypad.h>

const byte ROWS = 4;  //four rows
const byte COLS = 4;  //four columns
char keys[ROWS][COLS] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
};
byte rowPins[ROWS] = { 5, 4, 3, 2 };  //connect to the row pinouts of the keypad
byte colPins[COLS] = { 9, 8, 7, 6 };  //connect to the column pinouts of the keypad
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

int buttonState = 0;
int buttonState2 = 0;
int buttonState3 = 0;
int buttonPin = A0;
int buttonPin2 = A1;
int buttonPin3 = A2;

int hour = 0;
int minute = 0;
int second = 0;

int alarmHour = 0;
int alarmMinute = 0;
int alarmSecond = 0;

int alarmStatus = 0;  //0 = off, 1 = on

int mode = 0;       //0 = normal, 1 = set clock, 2 = set alarm
int selection = 0;  //0 = hour, 1 = minute, 2 = second, 3 = alarm status

void setup() {
  lcd.begin(16, 2);
  pinMode(buttonPin, INPUT);
  pinMode(buttonPin2, INPUT);
  pinMode(buttonPin3, INPUT);
}

void loop() {
  buttonState = digitalRead(buttonPin);
  buttonState2 = digitalRead(buttonPin2);
  buttonState3 = digitalRead(buttonPin3);

  char key = keypad.getKey();

  if (key) {
    if (key == 'A') {
      mode++;
      if (mode > 2) {
        mode = 0;
      }
    }
    if (key == 'B') {
      selection++;
      if (selection > 3) {
        selection = 0;
      }
    }
    if (key == 'C') {
      if (mode == 1) {
        if (selection == 0) {
          hour++;
          if (hour > 23) {
            hour = 0;
          }
        }
        if (selection == 1) {
          minute++;
          if (minute > 59) {
            minute = 0;
          }
        }
        if (selection == 2) {
          second++;
          if (second > 59) {
            second = 0;
          }
        }
        if (selection == 3) {
          alarmStatus = !alarmStatus;
        }
      }
      if (mode == 2) {
        if (selection == 0) {
          alarmHour++;
          if (alarmHour > 23) {
            alarmHour = 0;
          }
          if (selection == 1) {
            alarmMinute++;
            if (alarmMinute > 59) {
              alarmMinute = 0;
            }
          }
          if (selection == 2) {
            alarmSecond++;
            if (alarmSecond > 59) {
              alarmSecond = 0;
            }
          }
          if (selection == 3) {
            alarmStatus = !alarmStatus;
          }
        }
      }
      if (key == 'D') {
        if (mode == 1) {
          if (selection == 0) {
            hour--;
            if (hour < 0) {
              hour = 23;
            }
          }
          if (selection == 1) {
            minute--;
            if (minute < 0) {
              minute = 59;
            }
          }
          if (selection == 2) {
            second--;
            if (second < 0) {
              second = 59;
            }
          }
          if (selection == 3) {
            alarmStatus = !alarmStatus;
          }
        }
        if (mode == 2) {
          if (selection == 0) {
            alarmHour--;
            if (alarmHour < 0) {
              alarmHour = 23;
            }
          }
          if (selection == 1) {
            alarmMinute--;
            if (alarmMinute < 0) {
              alarmMinute = 59;
            }
          }
          if (selection == 2) {
            alarmSecond--;
            if (alarmSecond < 0) {
              alarmSecond = 59;
            }
          }
          if (selection == 3) {
            alarmStatus = !alarmStatus;
          }
        }
      }
    }
    if (buttonState == HIGH) {
      if (mode == 1) {
        if (selection == 0) {
          hour++;
          if (hour > 23) {
            hour = 0;
          }
        }
        if (selection == 1) {
          minute++;
          if (minute > 59) {
            minute = 0;
          }
        }
        if (selection == 2) {
          second++;
          if (second > 59) {
            second = 0;
          }
        }
        if (selection == 3) {
          alarmStatus = !alarmStatus;
        }
      }
      if (mode == 2) {
        if (selection == 0) {
          alarmHour++;
          if (alarmHour > 23) {
            alarmHour = 0;
          }
        }
        if (selection == 1) {
          alarmMinute++;
          if (alarmMinute > 59) {
            alarmMinute = 0;
          }
        }
        if (selection == 2) {
          alarmSecond++;
          if (alarmSecond > 59) {
            alarmSecond = 0;
          }
        }
        if (selection == 3) {
          alarmStatus = !alarmStatus;
        }
      }
    }
    if (buttonState2 == HIGH) {
      if (mode == 1) {
        if (selection == 0) {
          hour--;
          if (hour < 0) {
            hour = 23;
          }
        }
        if (selection == 1) {
          minute--;
          if (minute < 0) {
            minute = 59;
          }
        }
        if (selection == 2) {
          second--;
          if (second < 0) {
            second = 59;
          }
        }
      }
      if (mode == 2) {
        if (selection == 0) {
          alarmHour--;
          if (alarmHour < 0) {
            alarmHour = 23;
          }
        }
        if (selection == 1) {
          alarmMinute--;
          if (alarmMinute < 0) {
            alarmMinute = 59;
          }
        }
        if (selection == 2) {
          alarmSecond--;
          if (alarmSecond < 0) {
            alarmSecond = 59;
          }
        }
      }
    }
    if (buttonState3 == HIGH) {
      alarmStatus = 0;
    }
    if (mode == 0) {
      lcd.setCursor(0, 0);
      lcd.print(hour);
      lcd.print(":");
      lcd.print(minute);
      lcd.print(":");
      lcd.print(second);
      lcd.setCursor(0, 1);
      lcd.print(alarmHour);
      lcd.print(":");
      lcd.print(alarmMinute);
      lcd.print(":");
      lcd.print(alarmSecond);
      lcd.print(" ");
      if (alarmStatus == 0) {
        lcd.print("OFF");
      } else {
        lcd.print("ON");
      }
    }
    if (mode == 1) {
      lcd.setCursor(0, 0);
      lcd.print("SET CLOCK");
      lcd.setCursor(0, 1);
      if (selection == 0) {
        lcd.print("HOUR ");
      } else {
        lcd.print(" ");
      }
      if (selection == 1) {
        lcd.print("MINUTE ");
      } else {
        lcd.print(" ");
      }
      if (selection == 2) {
        lcd.print("SECOND ");
      } else {
        lcd.print(" ");
      }
    }
    if (mode == 2) {
      lcd.setCursor(0, 0);
      lcd.print("SET ALARM");
      lcd.setCursor(0, 1);
      if (selection == 0) {
        lcd.print("HOUR ");
      } else {
        lcd.print(" ");
      }
      if (selection == 1) {
        lcd.print("MINUTE ");
      } else {
        lcd.print(" ");
      }
      if (selection == 2) {
        lcd.print("SECOND ");
      } else {
        lcd.print(" ");
      }
      if (selection == 3) {
        lcd.print("ALARM STATUS ");
      } else {
        lcd.print(" ");
      }
      if (alarmStatus == 0) {
        lcd.print("OFF");
      } else {
        lcd.print("ON");
      }
    }

    if (hour == alarmHour && minute == alarmMinute && second == alarmSecond && alarmStatus == 1) {
      //play alarm
    }

    second++;
    if (second > 59) {
      second = 0;
      minute++;
    }
    if (minute > 59) {
      minute = 0;
      hour++;
    }
    if (hour > 23) {
      hour = 0;
    }

    delay(1000);
  }
}