#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 20, 4); // Set the LCD I2C address

#define Start 4 // start stop button
#define AddMinutesButton 5 // button to add 1 minute

int minutes = 0;
int seconds = 0;
int initialMinutes = 0; // Variable to store the initially set minutes
boolean timeState = false;

void setup() {
    pinMode(Start, INPUT_PULLUP);
    pinMode(AddMinutesButton, INPUT_PULLUP);

    Serial.begin(9600); // output

    lcd.begin(16, 2); // initialize the lcd for 16 chars 2 lines, turn on backlight
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("  SETEAZA TIMP");
    lcd.setCursor(0, 1);
    lcd.print(" SI APASA START");
}

void loop() {
    // Check if the add minutes button is pressed
    if (digitalRead(AddMinutesButton) == LOW) {
        minutes += 1; // Add 1 minute
        if (minutes >= 60) { // Limit to 59 minutes
            minutes = 59;
        }
        initialMinutes = minutes; // Save the initial value of minutes
        updateDisplay();
        delay(1000); // Debounce delay
    }

    // Check if the start button is pressed
    if (digitalRead(Start) == LOW) {
        timeState = true; // Set the timeState to true
    }

    // If timeState is true, start the timer automatically
    if (timeState) {
        timer();
    }
}

void timer() {
    while (timeState) {
        if (seconds == 0 && minutes > 0) {
            seconds = 60;
            minutes -= 1;
        }
        if (seconds == 0 && minutes == 0) { // Countdown alarm
            alarma();  // Trigger the alarm for 30 seconds
            resetTimer(); // Call the function to reset the timer to the previous value
            continue; // Restart the timer
        }

        // Sound alarm when less than 1 minute remains
        if (minutes == 0 && seconds <= 60) {
            if (seconds % 10 == 0 && seconds > 10) {
                tone(11, 1000, 200); // Beep every 10 seconds
            } else if (seconds <= 10) {
                tone(11, 1500, 200); // Beep every second in the last 10 seconds
            }
        }

        delay(992); // Delay for keeping time master setting
        seconds -= 1;
        updateDisplay();

        // Allow stopping the timer with the start button
        if (digitalRead(Start) == LOW) {
            delay(1000);
            timeState = false;
            break;
        }
    }
}

void updateDisplay() {
  lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("TIMP DE RESPAWN");
    lcd.setCursor(0, 1);
    lcd.print("ASTEAPTA: ");
    if (minutes <= 9) {
        lcd.print("0");
    }
    lcd.print(minutes);
    lcd.print(":");
    if (seconds <= 9) {
        lcd.print("0");
    }
    lcd.print(seconds);
}

void alarma() {
    unsigned long startTime = millis();  // Get the current time in milliseconds
    while (millis() - startTime < 30000) { // Run the alarm for 30 seconds (30000 milliseconds)
     lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("  POTI IESI DIN");
    lcd.setCursor(0, 1);
    lcd.print("    RESPAWN !");
        tone(11, 600, 250);  // First beep
        delay(250);
        tone(11, 800, 250);  // Second beep
        delay(250);
    }
}

void resetTimer() {
    // Reset the minutes to the value initially set by the user
    minutes = initialMinutes;   // Use the value saved in initialMinutes
    seconds = 0;   // Reset seconds to 0
    updateDisplay(); // Update the LCD display with the new time
}