#include <LiquidCrystal.h>

//Defining the led pins
int wash_led_pin = 2;
int rinse_led_pin = 3;
int spin_led_pin = 4;

int wash_button_pin = 7;
int rinse_button_pin = 8;
int spin_button_pin = 9;

unsigned long startTime = 0;
unsigned long elapsedTime = 0;
unsigned long countdownTime = 0;
bool isPaused = false;
bool isRunning = false;

int toggle_start_pause_pin = 5;
int last_toggle_start_pause_pin_state = LOW;
int cur_toggle_start_pause_pin_state = LOW;


int toggle_on_off_pin = 6;
int last_toggle_on_off_pin_state = LOW;
int cur_toggle_on_off_pin_state = LOW;

bool stop_flag = false;
bool toggle_start_pause_flag = false ;
bool toggle_on_off_flag = false;
bool is_button_pressed = false;
bool wash_button_flag = false;
bool rinse_button_flag = false;
bool spin_button_flag = false;
unsigned long remainingTime = 0;
unsigned long seconds = 0;
unsigned long minutes = 0;

LiquidCrystal lcd(10, 11, 12, 13, 14, 15);

void setup() {
  //LED pins
pinMode(wash_led_pin, OUTPUT);
digitalWrite(wash_led_pin, LOW);

pinMode(rinse_led_pin, OUTPUT);
digitalWrite(rinse_led_pin, LOW);

pinMode(spin_led_pin, OUTPUT);
digitalWrite(spin_led_pin, LOW);

//Button pins
pinMode(toggle_start_pause_pin, INPUT_PULLUP);
pinMode(toggle_on_off_pin, INPUT_PULLUP);
pinMode(wash_button_pin, INPUT_PULLUP);
pinMode(rinse_button_pin, INPUT_PULLUP);
pinMode(spin_button_pin, INPUT_PULLUP);

//initialize lcd
lcd.begin(16, 2);
lcd.print("START");
}

int debounce(int last, int button_port) 
{
  
    int current = digitalRead(button_port);

    if (last != current) 
    {

        delay(10);

        current = digitalRead(button_port);
    }

    return current;
}

void loop() {
//check if start/pause button is pressed
last_toggle_start_pause_pin_state = cur_toggle_start_pause_pin_state;

cur_toggle_start_pause_pin_state = debounce(last_toggle_start_pause_pin_state, toggle_start_pause_pin);
if (last_toggle_start_pause_pin_state == HIGH && cur_toggle_start_pause_pin_state == LOW) 
{
  isPaused = !isPaused;
  toggle_start_pause_flag = !toggle_start_pause_flag;
  is_button_pressed = !is_button_pressed;
}
if (toggle_start_pause_flag) 
{
  isPaused = false;
  isRunning = true;
}
  // start timer countdown when wash cycle is selected
  if (wash_button_pin == LOW && rinse_button_pin == HIGH && spin_button_pin == HIGH) 
 {
  if (is_button_pressed){
    wash_button_flag = !wash_button_flag;
  }
  else {
    wash_button_flag = true;
  }
  if (wash_button_flag && is_button_pressed) {
    digitalWrite(wash_led_pin, HIGH);
    countdownTime = 300000; //5minutes for regular wash
    startTime = millis();
  }
  }

if (wash_button_pin == HIGH && rinse_button_pin == LOW && spin_button_pin == HIGH) 
{
  //start countdown when rinse cycle is selected
  if (is_button_pressed){
    rinse_button_flag = !rinse_button_flag;
  }
  else {
    rinse_button_flag = true;
  }
  if (rinse_button_flag && is_button_pressed) {
    digitalWrite(rinse_led_pin, HIGH);
    countdownTime = 300000; //5minutes for regular rinse cycle
    startTime = millis();
  }
  digitalWrite(rinse_led_pin, digitalRead(rinse_button_pin));
}
if (wash_button_pin == HIGH && rinse_button_pin == HIGH && spin_button_pin == LOW) 
{
  //start countdown when spin cycle is selected
  if (is_button_pressed){
    spin_button_flag = !spin_button_flag;
  }
  else {
    spin_button_flag = true;
  }
  if (spin_button_flag && is_button_pressed) {
    digitalWrite(spin_led_pin, HIGH);
    countdownTime = 180000;
    startTime = millis();
  } 
  digitalWrite(spin_led_pin, digitalRead(spin_button_pin));
}
//pause button
if (toggle_start_pause_flag && !is_button_pressed) 
{
 if (isPaused) {
  isPaused = true;
  isRunning = false;
  //display "paused"
  lcd.setCursor (0, 1);
  lcd.print("Paused");
  is_button_pressed = true;
 }

//resume operation
if (!isPaused) 
{
  //display timer countdown on lcd
  lcd.setCursor(0, 1);
  lcd.print("Time left: ");
  elapsedTime - millis() - startTime;
  remainingTime = countdownTime - elapsedTime;
  seconds = remainingTime / 1000;
  minutes = seconds / 60;
  seconds = seconds % 60;
  lcd.print(minutes);
  lcd.print(":");
  lcd.print(seconds);
}

else  if (remainingTime <= 0) {
    isRunning = false;
  //turn off all leds and clear lcd when the machine is turned off
  digitalWrite(wash_led_pin, HIGH);
  digitalWrite(rinse_led_pin, HIGH);
  digitalWrite(spin_led_pin, HIGH);
  lcd.clear();
  lcd.print("END");
  isRunning = false;
  isPaused = false; 
}
}
}

//on/off button