/*

*/

const int LED_PIN = 12;
const int dot= 200;     // length of the morse code 'dot'
int dash = dot * 3;    // length of the morse code 'dash'
int partpause = dot;  // length of the pause between elements of a character
int characters = dot * 3;     // length of the spaces between characters
int spaces = dot * 7;  // length of the pause between words

void setup() {
  //initialize the digital pin as an output
  pinMode(LED_PIN, OUTPUT);
  
  Serial.begin(9600);
  Serial.println("Welcome!");
  digitalWrite(LED_PIN, HIGH);


}

char inputString[256];

//morse dot code
void morseDot()
{
  digitalWrite(LED_PIN, LOW);
  delay(dot);
}

//morse dash code
void morseDash()
{
  digitalWrite(LED_PIN, LOW);
  delay(dash);
}

//pausing code
void morsePause(int units)
{
  //delay between elements
  if(units == 'elements')
  {
    digitalWrite(LED_PIN, HIGH);
    delay(partpause);
  }
  //delay between letters
  else if(units == 'letters')
  {
    digitalWrite(LED_PIN, HIGH);
    delay(characters);
  }
  //delay between words (its spaces - characters since it already delayed between characters)
  else if(units == 'space')
  {
    digitalWrite(LED_PIN, HIGH);
    delay(spaces-characters);
  }
}


// code to check if a string has been input and if so,
// get the data and put it in inputString
bool getSerialInput()
{
  if (Serial.available())
  {
    size_t size = Serial.readBytesUntil('\n', inputString, 255);
    inputString[size] = 0;
    return true;
  }
  else
  {
  return false;
  }
}

// given a character, blink the corresponding morse code 
void morseCharacter(char ch)
{
  // blink the morse code for ch
  Serial.println(ch);
    // Take the passed character and blink the morse code
  if (ch == 'a') {
    morseDot();
    morsePause('elements');
    morseDash();
    morsePause('letters');
  }
  else if (ch == 'b') {
    morseDash();
    morsePause('elements');
    morseDot();
    morsePause('elements');
    morseDot();
    morsePause('elements');
    morseDot();
    morsePause('letters');
  }
  else if (ch == 'c') {
    morseDash();
    morsePause('elements');
    morseDot();
    morsePause('elements');
    morseDash();
    morsePause('elements');
    morseDot();
    morsePause('letters');
  }
  else if (ch == 'd') {
    morseDash();
    morsePause('elements');
    morseDash();
    morsePause('elements');
    morseDot();
    morsePause('letters');
  }
  else if (ch == 'e') {
    morseDot();
    morsePause('letters');
  }
  else if (ch == 'f') {
    morseDot();
    morsePause('elements');
    morseDot();
    morsePause('elements');
    morseDash();
    morsePause('elements');
    morseDot();
    morsePause('letters');
  }
  else if (ch == 'g') {
    morseDash();
    morsePause('elements');
    morseDash();
    morsePause('elements');
    morseDot();
    morsePause('letters');
  }
  else if (ch == 'h') {
    morseDot();
    morsePause('elements');
    morseDot();
    morsePause('elements');
    morseDot();
    morsePause('elements');
    morseDot();
    morsePause('letters');
  }
  else if (ch == 'i') {
    morseDot();
    morsePause('elements');
    morseDot();
    morsePause('letters');
  }
  else if (ch == 'j') {
    morseDot();
    morsePause('elements');
    morseDash();
    morsePause('elements');
    morseDash();
    morsePause('elements');
    morseDash();
    morsePause('letters');
  }
    else if (ch == 'k') {
    morseDash();
    morsePause('elements');
    morseDot();
    morsePause('elements');
    morseDash();
    morsePause('letters');
  }
  else if (ch == 'l') {
    morseDot();
    morsePause('elements');
    morseDash();
    morsePause('elements');
    morseDot();
    morsePause('elements');
    morseDot();
    morsePause('letters');
  }
    else if (ch == 'm') {
    morseDash();
    morsePause('elements');
    morseDash();
    morsePause('letters');
  }
  else if (ch == 'n') {
    morseDash();
    morsePause('elements');
    morseDot();
    morsePause('letters');
  }
  else if (ch == 'o') {
    morseDash();
    morsePause('elements');
    morseDash();
    morsePause('elements');
    morseDash();
    morsePause('letters');
  }
  else if (ch == 'p') {
    morseDot();
    morsePause('elements');
    morseDash();
    morsePause('elements');
    morseDash();
    morsePause('elements');
    morseDot();
    morsePause('letters');
  }
  else if (ch == 'q') {
    morseDash();
    morsePause('elements');
    morseDash();
    morsePause('elements');
    morseDot();
    morsePause('elements');
    morseDash();
    morsePause('letters');
  }
  else if (ch == 'r') {
    morseDot();
    morsePause('elements');
    morseDash();
    morsePause('elements');
    morseDot();
    morsePause('letters');
  }
  else if (ch == 's') {
    morseDot();
    morsePause('elements');
    morseDot();
    morsePause('elements');
    morseDot();
    morsePause('letters');
  }
  else if (ch == 't') {
    morseDash();
    morsePause('letters');
  }
  else if (ch == 'u') {
    morseDot();
    morsePause('elements');
    morseDot();
    morsePause('elements');
    morseDash();
    morsePause('letters');
  }
  else if (ch == 'v') {
    morseDot();
    morsePause('elements');
    morseDot();
    morsePause('elements');
    morseDot();
    morsePause('elements');
    morseDash();
    morsePause('letters');
  }
  else if (ch == 'w') {
    morseDot();
    morsePause('elements');
    morseDash();
    morsePause('elements');
    morseDash();
    morsePause('letters');
  }
  else if (ch == 'x') {
    morseDash();
    morsePause('elements');
    morseDot();
    morsePause('elements');
    morseDot();
    morsePause('elements');
    morseDash();
    morsePause('letters');
  }
  else if (ch == 'y') {
    morseDash();
    morsePause('elements');
    morseDot();
    morsePause('elements');
    morseDash();
    morsePause('elements');
    morseDash();
    morsePause('letters');
  }
  else if (ch == 'z') {
    morseDash();
    morsePause('elements');
    morseDash();
    morsePause('elements');
    morseDot();
    morsePause('elements');
    morseDot();
    morsePause('letters');
  }
  else if (ch == ' ') {
    morsePause('space');
  } 
}


void loop()
{
  // check to see if string has been input
  bool gotString = getSerialInput();
  // if it has, then print it out
  if (gotString)
  {
    // print out string retrieved from serial input
    Serial.print("string: "); Serial.println(inputString);
    // iterate over each character of string
    for (int i = 0; i < strlen(inputString); i++)
    {
      morseCharacter(inputString[i]);

    }
  }
}