/* 21/10/2021
    joinSketchv3_sosbuttons

    This version fixes the issues in joinSketchv2_sosbuttons
    as an example of what to look for when joining sketches.

    Although it works it is not perfect, if you put "show timestamp"
    in serial monitor you will see that when pressing and especially releasing the button
    You can get multiple press releases...the button is bouncing as the contact is made/broken

    Goals of the sketch

    Pressing the button and holding it down starts the sequence
    Releasing the button stops the sequence at any point
    seril print button state one...pressed or released.

    As usual I list any pins used in the sketch, this prevents duplicates
    pins used:

    pin 13 built in LED
    pin 8 button
*/
//LED_BUILTIN not used because it does not work on some boards sich as the ESP32
//So stops bad habits developing
const int ledPin = 13;  //set the LED pin
const int buttonPin = 8;//push button pin

//global variables used to control the system
int lastbuttonState;
int ledSequencePosition = 100;//keeps track of our position in the led sequence
unsigned long ledTimer;//the timer to alter the state of the led
//array to keep the sequence data first part will store the time delay, 2nd the led state
int ledSequenceArray[18][2] = {
  //dots
  {200, 1}, //HIGH for 0.2 seconds
  {200, 0}, //LOW for 0.2 seconds
  {200, 1},
  {200, 0},
  {200, 1},
  {600, 0}, //LOW for 0.6 seconds
  //dashes
  {600, 1}, //HIGH for 0.6 seconds
  {200, 0}, //LOW for 0.2 seconds
  {600, 1},
  {200, 0},
  {600, 1},
  {600, 0}, //LOW for 0.6 seonds
  //second set of dots
  {200, 1}, //HIGH for 0.2 seconds
  {200, 0}, //LOW for 0.2 seconds
  {200, 1},
  {200, 0},
  {200, 1},
  {2000, 0}, //LOW for 2 seconds, end of sequence
};


void setup() {
  Serial.begin(9600);
  Serial.println("joinSketchv3_sosbuttons");

  //set the pin mode for the LED pin
  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT);
}


void loop() {
  //sketch is broken into 2 sections,
  //the first constantly checks the state of the buttons
  int buttonState;
  buttonState = digitalRead(buttonPin);
  //has the button been pressed or stopped being pressed since we last checked
  if (buttonState != lastbuttonState) {
    lastbuttonState = buttonState;//update lastbuttonState
    //As the state has changed let's respond to the change
    if (buttonState > 0) { //button is HIGH...pressed so start sequence
      //Serial.println() the state
      Serial.println("button pressed");
      ledSequencePosition = 0;//starts the first part of the sequence
      ledTimer = 0;//start the timer now
    } else { //button LOW released so stop sequence
      //Serial.println() the state
      Serial.println("button released");
      digitalWrite(ledPin, LOW);//turn LED off
      ledSequencePosition = 100;//set value outside the routine so nothing gets processed
    }
  }



  
  if(millis() > ledTimer && ledSequencePosition < 18){
    //set the led to the next state
    digitalWrite(ledPin, ledSequenceArray[ledSequencePosition][1]);
    //set the millis() timer for the next change
    ledTimer = millis() + ledSequenceArray[ledSequencePosition][0];
    //incremement the ledSequencePosition for the next event
    ledSequencePosition++;   
  }
}