// video switch control panel
// https://wokwi.com/projects/348441099924144723

const byte MAXBUTTONS = 18;  // room for 18
const byte REALBUTTONS = 4;  // only four actually in the tables and wired

const byte buttonPin[MAXBUTTONS] =
{
  25, 27, 29, 31,             // and so forth, the pins where the buttons are
};

const char letterToSend[MAXBUTTONS] =
{
  's', 'd', 'v', 'k',         // the character to send
};
 
const byte ledPin[MAXBUTTONS] = 
{
  2, 3, 4, 5,                 // the pins where the LEDs are
};

const unsigned long videoDuration[MAXBUTTONS] = {
  4000, 5000, 6000, 77000UL,  // the duration in ms of the videos
};

const int stupidTurnOnDelayFactor = 2000;  // waaaaay too long!

void doCheckButtons()
{
  for (unsigned char buttonN = 0; buttonN < REALBUTTONS; buttonN++) {
    if (digitalRead(buttonPin[buttonN]) == 0)  // if button is pressed
    {
// I don't have a Leonardo or Due, so no   
//      Keyboard.write(letterToSend[buttonN]); // send a single letter

Serial.print("launching '");
Serial.print(letterToSend[buttonN]);
Serial.println("'...");

      delay(stupidTurnOnDelayFactor);
      digitalWrite(ledPin[buttonN], HIGH); //turn on the led
      delay(videoDuration[buttonN]);
      digitalWrite(ledPin[buttonN], LOW); //turn off the led after duration + stupidFactor

Serial.println("        and back waiting...");
    }
  }
}

void setup() {
  Serial.begin(115200);
  Serial.println("hello world!\n");

  for (unsigned char buttonN = 0; buttonN < REALBUTTONS; buttonN++) {
    pinMode(buttonPin[buttonN], INPUT_PULLUP);

    pinMode(ledPin[buttonN], OUTPUT);
    digitalWrite(ledPin[buttonN], LOW);
  }
}

void loop() {
  doCheckButtons();
}