// TM1637 SevenSegment Counter Wokwi Example
//
// https://wokwi.com/projects/339227323398095442

#include <TM1637.h>

const int CLK = 2;
const int DIO = 3;
#define DURATION_IN_MILLIS 3000
#define OUTPUT_LED 6
#define BLINK_LED  7
#define BUTTON1_PIN 8
#define BUTTON2_PIN 9
#define BUTTON3_PIN 10

TM1637 tm(CLK, DIO);

boolean toggle1 = 0;
unsigned int counter = 0;
unsigned int TimerCnt = 0;
int lastState1 = HIGH;
int lastState2 = HIGH;
int lastState3 = HIGH;
long prev = 0;
unsigned long onTime=0;
unsigned long onTime1=0;
int buttonState = 0;
int lastReading = HIGH;
int count;
int startTimer =0;
void setup()
{
  pinMode(BUTTON1_PIN, INPUT_PULLUP);
  pinMode(BUTTON2_PIN, INPUT_PULLUP);
  pinMode(BUTTON3_PIN, INPUT_PULLUP);
  //set pins as outputs
  pinMode(OUTPUT_LED, OUTPUT);
  pinMode(BLINK_LED, OUTPUT);
  pinMode(A0, INPUT);
  tm.init();
  tm.set(BRIGHT_TYPICAL);
  cli();//stop interrupts
  //set timer1 interrupt at 1Hz
  TCCR1A = 0;// set entire TCCR1A register to 0
  TCCR1B = 0;// same for TCCR1B
  TCNT1  = 0;//initialize counter value to 0
  // set compare match register for 1hz increments
  OCR1A = 15624;// = (16*10^6) / (1*1024) - 1 (must be <65536)
  // turn on CTC mode
  TCCR1B |= (1 << WGM12);
  // Set CS12 and CS10 bits for 1024 prescaler
  TCCR1B |= (1 << CS12) | (1 << CS10);  
  // enable timer compare interrupt
  TIMSK1 |= (1 << OCIE1A);
  

  Serial.begin(115200);
  sei();//allow interrupts
}


void loop() 
{
  buttonState = digitalRead(BUTTON1_PIN);

  // Quick presses
  if (buttonState == LOW && lastReading == HIGH) 
  {
    onTime = millis();
     Serial.print("\n");
    Serial.print("old");
    Serial.print(onTime );
    Serial.print("\n");
    counter = counter+1;
    tm.display(0, (counter / 1000) % 10);
    tm.display(1, (counter / 100) % 10);
    tm.display(2, (counter / 10) % 10);
    tm.display(3, counter % 10);
  }

  //button being held for half second 
  if (buttonState == LOW && lastReading == LOW ) 
  { 
    if ((millis() - onTime) > 3000 ) // half second hold time
    {
      delay(200); // this delay is just for "count"
      TimerCnt = counter;
      Serial.println(TimerCnt);
      lastReading = HIGH;
      onTime1 =millis();
      Serial.print("\n");
      Serial.print("new");
      Serial.print(onTime1);
      Serial.print("\n");
      startTimer = 1;
    } 
  }
  lastReading = buttonState;
  int value1 = digitalRead((BUTTON2_PIN));
  if (lastState2 != value1) 
  {
    lastState2 = value1;
    if (value1== LOW) 
    {
      if(counter !=0)
      {
        counter = counter-1;
      }
      tm.display(0, (counter / 1000) % 10);
      tm.display(1, (counter / 100) % 10);
      tm.display(2, (counter / 10) % 10);
      tm.display(3, counter % 10);
    }
  }
  int analogValue = analogRead(A0);
  float Voltage = (analogValue * 5.0)/1023;
  //Serial.print("Voltage: ");
  //Serial.print(Voltage);
  //Serial.print("\n ");
  delay(100);
}

ISR(TIMER1_COMPA_vect)
{//timer1 interrupt 1Hz toggles pin 13 (LED)
//generates pulse wave of frequency 1Hz/2 = 0.5kHz (takes two cycles for full wave- toggle high then toggle low)
  
  if(startTimer !=0)
  {
  if(TimerCnt !=0)
  {
    TimerCnt = TimerCnt-1;
    if (toggle1)
    {
      digitalWrite(BLINK_LED,HIGH);
      toggle1 = 0;
    }
    else
    {
      digitalWrite(BLINK_LED,LOW);
      toggle1 = 1;
    }
  }
  else
  {
    digitalWrite(BLINK_LED,LOW);
    digitalWrite(OUTPUT_LED,HIGH);
    cli();//stop interrupts
  }
  tm.display(0, (TimerCnt / 1000) % 10);
  tm.display(1, (TimerCnt / 100) % 10);
  tm.display(2, (TimerCnt / 10) % 10);
  tm.display(3, TimerCnt % 10);
  }
}