// LAB 1 ; ADRIANA SARAH 52224123439

int redLight = 13;
int orangeLight = 12;
int yellowLight = 11;
int greenLight = 10;
int babyblueLight = 2;
int blueLight = 3;
int purpleLight = 4;
int magentaLight = 5;
int whiteLight = 9;
int otherRed = 8;

const int ledPins[] = {2, 3, 4, 5};
int currentTask = 0;
unsigned long previousMillis = 0;
const long interval = 5000; // 5 seconds to demonstrate each task

void setup() {
  Serial.begin(9600); // initialize serial communication
  pinMode(redLight, OUTPUT);
  pinMode(orangeLight, OUTPUT);
  pinMode(yellowLight, OUTPUT);
  pinMode(greenLight, OUTPUT);
  pinMode(babyblueLight, OUTPUT);
  pinMode(blueLight, OUTPUT);
  pinMode(purpleLight, OUTPUT);
  pinMode(magentaLight, OUTPUT);
  pinMode(whiteLight, OUTPUT);
  pinMode(otherRed, OUTPUT);
}

void loop() {
  unsigned long currentMillis = millis();

  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;
    turnOffAllLeds(); // ensure all LEDs are turned off before switching tasks
    currentTask = (currentTask + 1) % 6; // cycle through tasks
  }

  switch (currentTask) {
    case 0:
      Serial.println("Task 0: Blink 200ms");
      blink200ms();
      break;
    case 1:
      Serial.println("Task 1: Mimic Heartbeat");
      mimicHeartbeat();
      break;
    case 2:
      Serial.println("Task 2: Fastest Blink A Human Can See");
      fastestBlink();
      break;
    case 3:
      Serial.println("Task 3: Blink Multiple LEDs");
      blinkMultipleLeds();
      break;
    case 4:
      Serial.println("Task 4: SOS Morse Code");
      morseCode();
      break;
    case 5:
      Serial.println("Task 5: Ambulance Siren Lights");
      ambulanceLights();
      break;
  }
}

// function to turn off all LEDs
void turnOffAllLeds() {
  digitalWrite(redLight, LOW);
  digitalWrite(orangeLight, LOW);
  digitalWrite(yellowLight, LOW);
  digitalWrite(greenLight, LOW);
  digitalWrite(babyblueLight, LOW);
  digitalWrite(blueLight, LOW);
  digitalWrite(purpleLight, LOW);
  digitalWrite(magentaLight, LOW);
  digitalWrite(whiteLight, LOW);
  digitalWrite(otherRed, LOW);
}

// task a (200ms second interval)
void blink200ms() {
  digitalWrite(redLight, HIGH);
  delay(200);
  digitalWrite(redLight, LOW);
  delay(200);
}

// task b (mimic heartbeat)
void mimicHeartbeat() {
  digitalWrite(orangeLight, HIGH);
  delay(100);
  digitalWrite(orangeLight, LOW);
  delay(100);
  digitalWrite(orangeLight, HIGH);
  delay(100);
  digitalWrite(orangeLight, LOW);
  delay(300);
}

// task c (fastest blink the human eye can see)
void fastestBlink() {
  digitalWrite(yellowLight, HIGH);
  delay(3); // can adjust to 1ms, 2ms, or 3ms
  digitalWrite(yellowLight, LOW);
  delay(3);
}

// task d (blink 2, 3, or 4 LEDs at once)
void blinkMultipleLeds() {
  // light 2 LEDs
  for (int i = 0; i < 2; i++) {
    digitalWrite(ledPins[i], HIGH);
  }
  delay(500);
  for (int i = 0; i < 2; i++) {
    digitalWrite(ledPins[i], LOW);
  }
  delay(500);

  // light 3 LEDs
  for (int i = 0; i < 3; i++) {
    digitalWrite(ledPins[i], HIGH);
  }
  delay(500);
  for (int i = 0; i < 3; i++) {
    digitalWrite(ledPins[i], LOW);
  }
  delay(500);

  // light 4 LEDs
  for (int i = 0; i < 4; i++) {
    digitalWrite(ledPins[i], HIGH);
  }
  delay(500);
  for (int i = 0; i < 4; i++) {
    digitalWrite(ledPins[i], LOW);
  }
  delay(500);
}

// task e (morse code)
void morseCode() {
  for (int i = 0; i < 3; i++) {
    digitalWrite(greenLight, HIGH);
    delay(200); // dot duration
    digitalWrite(greenLight, LOW);
    delay(200); // space between dots
  }
  delay(600); // space between letters

  for (int i = 0; i < 3; i++) {
    digitalWrite(greenLight, HIGH);
    delay(600); // dash duration
    digitalWrite(greenLight, LOW);
    delay(200); // space between dashes
  }
  delay(600); // space between letters

  for (int i = 0; i < 3; i++) {
    digitalWrite(greenLight, HIGH);
    delay(200); // dot duration
    digitalWrite(greenLight, LOW);
    delay(200); // space between dots
  }
  delay(2000); // pause before repeating
}

// task f (any sort of LED flashing combo)
void ambulanceLights() {
  digitalWrite(whiteLight, HIGH);
  delay(100);
  digitalWrite(whiteLight, LOW);
  delay(100);
  digitalWrite(otherRed, HIGH);
  delay(100);
  digitalWrite(otherRed, LOW);
  delay(100);

  for (int i = 0; i < 10; i++) {
    digitalWrite(whiteLight, HIGH);
    digitalWrite(otherRed, LOW);
    delay(50);
    digitalWrite(whiteLight, LOW);
    digitalWrite(otherRed, HIGH);
    delay(50);
  }
}