#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SH1106.h>

#define OLED_RESET -1

#define SCREEN_WIDTH 128 // OLED display width,  in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// declare an SH1106 display object connected to I2C
Adafruit_SH1106 display(OLED_RESET);

unsigned long startTime = 0;
unsigned long blinkTime1 = 0;
unsigned long blinkTime2 = 0;
unsigned long interval = 250;
const int countdownDuration = 10; // Countdown duration in seconds
int remainingTime = countdownDuration - (millis() - startTime) / 1000; // Calculate remaining time
int LastremainingTime;

int seq = 1;
int seconds;
long start_time = 0;
String sequence = "stop";

// Buttons
int buttonPin1 = 7;  // Start
int buttonPin2 = 8; // Restart
int buttonPin3 = 9; // Stop
int buttonPin4 = 10;  // Sequence 1 button
int buttonPin5 = 11;  // Sequence 2 button
int buttonPin6 = 12;  // Sequence 3 button
int buttonPin7 = 13;  // Sequence 4 button

int buttonState1 = 0;
int buttonState2 = 0;
int buttonState3 = 0;
int buttonState4 = 0; // For Sequence 1 if button pressed
int buttonState5 = 0; // For Sequence 2 if button pressed
int buttonState6 = 0; // For Sequence 3 if button pressed
int buttonState7 = 0; // For Sequence 4 if button pressed

int lastButtonState1 = 0; // For recording state of button 4
int lastButtonState2 = 0; // For recording state of button 4
int lastButtonState3 = 0; // For recording state of button 4
int lastButtonState4 = 0; // For recording state of button 4
int lastButtonState5 = 0; // For recording state of button 5
int lastButtonState6 = 0; // For recording state of button 6
int lastButtonState7 = 0; // For recording state of button 7

int OLEDState; //OLED

void setup() {
  display.begin(SH1106_SWITCHCAPVCC, 0x3C); // Initialize display
  display.clearDisplay(); // Clear display
  display.setTextColor(WHITE, BLACK); // Set text color
  display.setTextSize(1); // Set text size
  display.setCursor(0,0); // Set cursor position
  display.println("Press button"); // Display message
  display.println("to start timer"); // Display message
  display.display(); // Show message
  pinMode(buttonPin1, INPUT); // Set button pin as input with internal pull-up resistor
  pinMode(buttonPin2, INPUT);
  pinMode(buttonPin3, INPUT);
  pinMode(buttonPin4, INPUT);
  pinMode(buttonPin5, INPUT);
  pinMode(buttonPin6, INPUT);
  pinMode(buttonPin7, INPUT);
}

void loop() 
{
  button4();
  button5();
  button6();
  button7(); 

  
buttonState1 = digitalRead(buttonPin1); // Read button state
if (buttonState1 != lastButtonState1 && buttonState1 == HIGH && sequence == "stop")
  {
  sequence1();
  }
  
  sequence2();
  sequence3();
  sequence4();
  sequence5();
  sequenceReset();
  sequenceEnd();

  seconds = (millis() - start_time) / 1000;

  int buttonState1 = digitalRead(buttonPin1);
  int buttonState2 = digitalRead(buttonPin2);
  int buttonState3 = digitalRead(buttonPin3);
  int buttonState4 = digitalRead(buttonPin4);
  int buttonState5 = digitalRead(buttonPin5);
  int buttonState6 = digitalRead(buttonPin6);
  int buttonState7 = digitalRead(buttonPin7);
}

/*void OLEDblink()
{
 blinkTime1 = millis();
  if ((blinkTime1 - blinkTime2) > interval)
  {
   blinkTime2 = blinkTime1;
    
    if (OLEDState == 0)
    {
      OLEDState = 1;
    }
    
    else
    {
      OLEDState = 0;
    }
    
   if (OLEDState == 1)
   {
    display.setCursor(0,50); // Set cursor position
    display.println("Sequence 5 blinking"); // Display message
    display.display();
   }

   else if (OLEDState == 0)
   {
    display.setCursor(0,50); // Set cursor position
    display.println("                       "); // Display message
    display.display();
   }
  } 
}
*/

void button4()
{
  buttonState4 = digitalRead(buttonPin4); // Read button state
  if (buttonState4 != lastButtonState4 && buttonState4 == HIGH) { // If button state changed from HIGH to LOW
    startTime = millis(); // Record start time
    display.clearDisplay(); // Clear display
    display.setCursor(0,0); // Set cursor position
    display.println("Sequence 1"); // Display message
    display.println("Countdown:"); // Display message
    display.display(); // Show message
  }
  lastButtonState4 = buttonState4; // Update last button state
  timer();
}

void button5()
{
  buttonState5 = digitalRead(buttonPin5); // Read button state
  if (buttonState5 != lastButtonState5 && buttonState5 == HIGH) 
  { // If button state changed from HIGH to LOW
    startTime = millis(); // Record start time
    display.clearDisplay(); // Clear display
    display.setCursor(0,0); // Set cursor position
    display.println("Sequence 2"); // Display message
    display.println("Countdown:"); // Display message
    display.display(); // Show message
  }
  lastButtonState5 = buttonState5; // Update last button state
  timer();
}

void button6()
{
  buttonState6 = digitalRead(buttonPin6); // Read button state
  if (buttonState6 != lastButtonState6 && buttonState6 == HIGH) { // If button state changed from HIGH to LOW
    startTime = millis(); // Record start time
    display.clearDisplay(); // Clear display
    display.setCursor(0,0); // Set cursor position
    display.println("Sequence 3"); // Display message
    display.println("Countdown:"); // Display message
    display.display(); // Show message
  }
  lastButtonState6 = buttonState6; // Update last button state
  timer();
}

void button7()
{
  buttonState7 = digitalRead(buttonPin7); // Read button state
  if (buttonState7 != lastButtonState7 && buttonState7 == HIGH) { // If button state changed from HIGH to LOW
    startTime = millis(); // Record start time
    display.clearDisplay(); // Clear display
    display.setCursor(0,0); // Set cursor position
    display.println("Sequence 4"); // Display message
    display.println("Countdown:"); // Display message
    display.display(); // Show message
  }
  lastButtonState7 = buttonState7; // Update last button state
  timer();
}

void sequence1()
{
     // If button state changed from HIGH to LOW
    startTime = millis(); // Record start time
    start_time = 0;
    display.clearDisplay(); // Clear display
    display.setCursor(0,0); // Set cursor position
    display.println("Sequence 1"); // Display message
    display.println("Countdown:"); // Display message
    display.display(); // Show message
    timer();
    
  seq = 2;
  sequence = "start";

  lastButtonState1 = buttonState1; // Update last button state
}

void sequence2()
{
  if (seq == 2 && (seconds > 10 && seconds <=20))
  {
  startTime = millis();
  display.clearDisplay(); // Clear display
  display.setCursor(0,0); // Set cursor position
  display.println("Sequence 2"); // Display message
  display.println("Countdown:"); // Display message
  display.display(); // Show message
  timer();  

  seq = 3;
  }
}

void sequence3()
{
  if (seq == 3 && (seconds > 20 && seconds <= 30))
  {
  startTime = millis();
  display.clearDisplay(); // Clear display
  display.setCursor(0,0); // Set cursor position
  display.println("Sequence 3"); // Display message
  display.println("Countdown:"); // Display message
  display.display(); // Show message
  timer();
  

  seq = 4;
  }
}

void sequence4()
{
  if (seq == 4 && (seconds > 30 && seconds <= 40))
  {
  startTime = millis();
  display.clearDisplay(); // Clear display
  display.setCursor(0,0); // Set cursor position
  display.println("Sequence 4"); // Display message
  display.println("Countdown:"); // Display message
  display.display(); // Show message
  timer();
  seq = 5;
  }

}

void sequence5()
{
  if (seq == 5 && (seconds > 40 && seconds <= 50))
  {
    startTime = millis();
  display.clearDisplay(); // Clear display
  display.setCursor(0,0); // Set cursor position
  display.println("Sequence 5"); // Display message
  display.println("Countdown:"); // Display message
  display.display(); // Show message
  timer();
  seq = 6;
  }

}
void sequenceEnd()
{
  buttonState3 = digitalRead(buttonPin3); // Read button state
  if (buttonState3 != lastButtonState3 && buttonState3 == HIGH) { // If button state changed from HIGH to LOW
    startTime = 0; // Record start time
    display.clearDisplay(); // Clear display
    display.setCursor(0,0); // Set cursor position
    display.println("Stopped"); // Display message
    display.display(); // Show message
  }
  lastButtonState3 = buttonState3; // Update last button state 
}

void sequenceReset()
{
  buttonState2 = digitalRead(buttonPin2); // Read button state
  if (buttonState2 != lastButtonState2 && buttonState2 == HIGH && sequence == "start")
    {
     // If button state changed from HIGH to LOW
    buttonState1 = HIGH;
    seq = 1;
    sequence = "stop";
    sequence1();
    }

    lastButtonState1 = buttonState1;
    lastButtonState2 = buttonState2; // Update last button state
}

void timer()
{
  if (startTime > 0) { // If countdown has started
    int remainingTime = countdownDuration - (millis() - startTime) / 1000; // Calculate remaining time
    if (remainingTime > 0) 
    { // If countdown not over
      display.setCursor(0, 20); // Set cursor position
      display.print(remainingTime); // Display remaining time
      display.print(" "); // Display remaining time
      display.display(); // Show message
    }

    else if (remainingTime == 0)
    {
      display.clearDisplay();
      display.setCursor(0, 20); // Set cursor position
      display.print("Sequence End"); // Display remaining time
      display.display(); // Show message
    }

    

    if (remainingTime % 2 > 0)
    {
      display.setCursor(0,50); // Set cursor position
      display.println("Sequence 5 blinking"); // Display message
      display.display();
    }

    else
    {
      display.setCursor(0,50); // Set cursor position
      display.println("                   "); // Display message
      display.display();
    }
  }
}