#include <Arduino.h>
const int green = 12;
const int red = 11;
const int white = 8;
const int tDelay = 500;
const int red_button = 6;
const int white_button = 7;
//const int interrupt_button = 2;
volatile byte red_state = LOW;
volatile byte white_state = LOW;
volatile bool vital = false;
volatile bool reset = false;
volatile unsigned long nominal_start_time = 0;
volatile unsigned long hr_start_time = 0;
volatile unsigned long rr_start_time = 0;
volatile unsigned long temp_start_time = 0;
volatile byte hr_pin = HIGH;

enum State {
  NOMINAL,
  ALARM,
  VITAL_CHECK
};

State current_state = NOMINAL;

void update_leds() {
  switch(current_state) {
    case NOMINAL:
      digitalWrite(red, LOW);
      digitalWrite(green, HIGH);
      digitalWrite(white, LOW);
    case ALARM:
      digitalWrite(red, HIGH);
      digitalWrite(green, LOW);
      digitalWrite(white, LOW);
      break;
    case VITAL_CHECK:
      digitalWrite(red, LOW);
      digitalWrite(green, HIGH);
      while (true) {
        digitalWrite(white, HIGH);
        delay(250);
        digitalWrite(white, LOW);
        delay(250);
      }
  }
}

void setup() {
    pinMode(red, OUTPUT);
    pinMode(green, OUTPUT);
    pinMode(white, OUTPUT);
    pinMode(red_button, INPUT);
    pinMode(white_button, INPUT);
    attachInterrupt(digitalPinToInterrupt(2), interrupt, RISING);
    Serial.begin(9600);
}

void loop() {
  if (!reset || hr_pin == HIGH) {
    current_state = ALARM;
    update_leds();
  } else if (vital || reset || hr_pin == LOW || current_state == NOMINAL) {
    unsigned long now = millis();
    if (now - nominal_start_time < 10000) {
      current_state = NOMINAL;
      update_leds();
      vital = false;
      reset = false;
    } else {
      current_state = VITAL_CHECK;
      update_leds();
      nominal_start_time = 0;
    }
  }
}

void interrupt() {
  if (digitalRead(red_button) == HIGH) {
    //red_state = !red_state;
    //digitalWrite(red, red_state);
    reset = true;
    hr_pin = LOW;
  }
  if (digitalRead(white_button) == HIGH) {
    //green_state = !white_state;
    //digitalWrite(white, white_state);
    vital = true;
  } 
}