// MACRO-START * MACRO-START * MACRO-START * MACRO-START * MACRO-START * MACRO-START *
// a detailed explanation how these macros work is given in this tutorial
// https://forum.arduino.cc/t/comfortable-serial-debug-output-short-to-write-fixed-text-name-and-content-of-any-variable-code-example/888298

#define dbg(myFixedText, variableName) \
  Serial.print( F(#myFixedText " "  #variableName"=") ); \
  Serial.println(variableName);

#define dbgi(myFixedText, variableName,timeInterval) \
  { \
    static unsigned long intervalStartTime; \
    if ( millis() - intervalStartTime >= timeInterval ){ \
      intervalStartTime = millis(); \
      Serial.print( F(#myFixedText " "  #variableName"=") ); \
      Serial.println(variableName); \
    } \
  }

#define dbgc(myFixedText, variableName) \
  { \
    static long lastState; \
    if ( lastState != variableName ){ \
      Serial.print( F(#myFixedText " "  #variableName" changed from ") ); \
      Serial.print(lastState); \
      Serial.print( F(" to ") ); \
      Serial.println(variableName); \
      lastState = variableName; \
    } \
  }

#define dbgcf(myFixedText, variableName) \
  { \
    static float lastState; \
    if ( lastState != variableName ){ \
      Serial.print( F(#myFixedText " "  #variableName" changed from ") ); \
      Serial.print(lastState); \
      Serial.print( F(" to ") ); \
      Serial.println(variableName); \
      lastState = variableName; \
    } \
  }
// MACRO-END * MACRO-END * MACRO-END * MACRO-END * MACRO-END * MACRO-END * MACRO-END *

// C++ code
int ON = 0;
int START = 0;
int STOP = 0;
int TIME = 0;
int SEC = 0;
float SEC_LEFT = 0;
int TONE = 0;
float BEEP = 0.20;

#define bz1 3 

#define bt1 4
#define bt2 5
#define bt3 10

#define lEDG1 6  
#define lEDG2 7  
#define lEDG3 8  
#define lEDP1 9  
//-----------------------------------------------------------------------
void setup(){
  pinMode(lEDG1, OUTPUT);
  pinMode(bz1, OUTPUT);
  pinMode(lEDP1, OUTPUT);
  pinMode(bt2, INPUT);
  Serial.begin(9600);
  pinMode(lEDG3, OUTPUT);
  pinMode(lEDG3, OUTPUT);
  pinMode(bt3, INPUT);
  pinMode(bt1, INPUT);
  ON = 0;
  TIME = 1;
  SEC = 15;
  digitalWrite(lEDG1, HIGH);
}
//-----------------------------------------------------------------------

void loop(){
  TONE = 1;
  SEC_LEFT = SEC;

  while (ON == 1) {
    analogWrite(bz1, TONE);
    delay(300); // Wait for 300 millisecond(s)
    analogWrite(bz1, TONE);
    delay(500); // Wait for 500 millisecond(s)
    //Serial.println(BEEP,2);
    dbgcf("whileOn",BEEP);

    while (BEEP > 0.15) {
      dbgi("whileBeep",BEEP,500);
      SEC_LEFT += -1.0;
      BEEP = (0.1 * (0.9 * (SEC_LEFT / SEC)));
      dbgcf("whileBeep",BEEP);
      //Serial.println(BEEP,2);
      analogWrite(bz1, TONE);
      digitalWrite(lEDP1, HIGH);
      delay(1000); // Wait for 1000 millisecond(s)
      analogWrite(bz1, 0);
      digitalWrite(lEDP1, LOW);
      ON = 0;
      BEEP = 0.20;
    }
  }

  if (digitalRead(bt2) == HIGH) {   // START OF CYCLE THROUGH TIME
    Serial.println("activate bt2" );
    if (TIME == 4) {
       Serial.println(TIME); 
      TIME = 0;
      SEC = 15;
      digitalWrite(lEDG1, HIGH);
      digitalWrite(lEDP1, LOW);
      digitalWrite(lEDG3, LOW);
    }

    if (TIME == 1) {
      SEC = 15;
      digitalWrite(lEDG1, HIGH);
      digitalWrite(lEDP1, LOW);
      digitalWrite(lEDG3, LOW);
    }

    if (TIME == 2) {
      SEC = 15;
      digitalWrite(lEDP1, HIGH);
      digitalWrite(lEDG1, LOW);
      digitalWrite(lEDG3, LOW);
    }

    if (TIME == 3) {
      SEC = 15;
      digitalWrite(lEDG3, HIGH);
      digitalWrite(lEDP1, LOW);
      digitalWrite(lEDG1, LOW);
    }
    // END OF CYCLE THROUGH TIME
    delay(500); // Wait for 500 millisecond(s)
    TIME += 1;
  }

  dbgc("T1",TIME);

  if (digitalRead(bt3) == HIGH) {   // START OF START BUTTON
    Serial.println("activate bt3");
    ON = 1;
    // END OF START BUTTON
    delay(500); // Wait for 500 millisecond(s)
  }

  if (digitalRead(bt1) == HIGH) {   // START OF STOP BUTTON
    Serial.println("activate bt1");
    ON = 0;
    digitalWrite(lEDP1, LOW);
    // END OF STOP BUTTON
    delay(500); // Wait for 500 millisecond(s)
  }

  dbgc("BoL",ON);
}