/*
  State Change and Blink State
  October 26-28, 2023
*/

// circuit connections
const int buttonPin = 2;    // pushbutton to pin 2, to Gnd with 10 kOhm resistor
const int ledPin = 3;       // LED to pin 3 with 220 ohm resistor

int ledState = LOW;
int currentButtonState;     // current state of button
int lastButtonState;    // previous state of the button

int numBlinks = 3;          // set the desired # of blinks here
const long interval = 250;  // interval time for blinking here, in milliseconds

// Below derives stopInterval from numBlinks and interval, so only
// the above need to be adjusted if changes desired
// Note: each blink is an on/off sequence, so multiply numBlinks by two
const long stopInterval = interval * (numBlinks*2) + interval;

unsigned long currentTime = 0;
unsigned long previousTime = 0;

void setup() {
  pinMode(buttonPin, INPUT);
  pinMode(ledPin, OUTPUT);
  Serial.begin(9600);

  currentButtonState = digitalRead(buttonPin);
}

void loop() {
  
  currentButtonState = digitalRead(buttonPin);

  if (lastButtonState == HIGH && currentButtonState == LOW) {
    
    currentTime = millis();
    //Serial.print("currentTime: ");
    //Serial.println(currentTime);
    
    // toggle state of LED
    ledState = !ledState;
    Serial.print("ledState: ");
    Serial.println(ledState);
 
    // control LED according to the toggled state
    //digitalWrite(ledPin, ledState);  //turns the LED on or off based on the variable
    blinkPattern2(ledState);
  }

  lastButtonState = currentButtonState;          // save the last state
}


/*
  // compare the buttonState to its previous state
  if (currentButtonState != lastButtonState) {
    // if the state has changed, increment the counter
    if (currentButtonState == HIGH) {

      unsigned long currentTime = millis();
      
      blinkPattern();

      // save the current state as the last state, for next time through the loop
        lastButtonState = buttonState;

    } else {
      digitalWrite(ledPin, LOW);
      // (buttonState == LOW)
    
    }
    // Delay a little bit to avoid bouncing
    //delay(50);
  }
}
*/

void blinkPattern2(int state) {
  digitalWrite(ledPin, state);
  delay(250);
  digitalWrite(ledPin, LOW);
  delay(250);
  digitalWrite(ledPin, state);
  delay(250);
  digitalWrite(ledPin, LOW);
  delay(250);
  digitalWrite(ledPin, state);
  delay(250);
  digitalWrite(ledPin, LOW);
  delay(250);
  ledState = !ledState;
  Serial.print("ledState: ");
  Serial.println(ledState);
}


void blinkPattern(int state) {
    //previousTime = millis();
    
  //if (state) {

    // for a certain amount of time, blink the LED
    // to work fully, nesting if statements was needed
    if (millis() - currentTime <= stopInterval) {
      if (currentTime - previousTime >= interval) {
        previousTime = currentTime;
        state = !state;
        digitalWrite(ledPin, state);
        // Serial.println(previousTime);
      }
    }
    
    // after a certain time, stop blinking LED
    if (currentTime > stopInterval) {
      state = HIGH;                  // this works for LOW, too
      digitalWrite(ledPin, state);  
    }
  //}
}