#include <Wire.h>
#include <EEPROM.h>
#include <LiquidCrystal_I2C.h>

#define PULSE_PIN 9
#define MOTOR_PIN 3
#define SPEAKER_PIN 4
#define CALIBRATION_DISTANCE_CM 100
#define MAX_ROLL_OUT_METERS 25

LiquidCrystal_I2C lcd(0x27, 16, 2);

volatile unsigned long pulseCount = 0;
unsigned long pulsesPerMeter;
unsigned long rollOutPulses;
unsigned long targetPulseCount;
bool systemOn = false;
int meters = 0;
int setmeters = 25;
int pulses = 0;
bool buttonPressed = false; // Flag to indicate if the button is pressed
unsigned long startTime; // Variable to store the start time
void handlePulse() {
  pulseCount++;
}

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.print("display ok");
  delay(500);

  pinMode(PULSE_PIN, INPUT_PULLUP);

  pinMode(MOTOR_PIN, OUTPUT);
  pinMode(SPEAKER_PIN, OUTPUT);
  

  digitalWrite(MOTOR_PIN, LOW);
  digitalWrite(SPEAKER_PIN, LOW);
  

  attachInterrupt(digitalPinToInterrupt(PULSE_PIN), handlePulse, FALLING);
  
  // Load the stored pulses per meter value from EEPROM
  pulsesPerMeter = EEPROM.read(0);
  if (pulsesPerMeter == 0) {
    // If the EEPROM value is 0, set a default value
    pulsesPerMeter = 1000;
  }

  // Calculate the number of pulses for the maximum roll-out distance
  rollOutPulses = pulsesPerMeter * MAX_ROLL_OUT_METERS;

  // Display the default value on the LCD
  lcd.setCursor(0, 0);
  lcd.print("Amount of meters?");
  lcd.setCursor(0, 1);
  lcd.print(MAX_ROLL_OUT_METERS);
}

void ready() {
    digitalWrite(MOTOR_PIN, LOW);
    lcd.clear();
    lcd.print("ready");
    tone(SPEAKER_PIN, 1000, 2000); 
    delay (2500); 
    meters = 0;
    loop(); 
    }


  void rollout() {
    while (meters < setmeters) {
        lcd.clear();
        lcd.print(meters);
        delay(50);
        meters++;
        digitalWrite(MOTOR_PIN, HIGH);
    }
    ready();

  
  
  }
  
  void calibrate() {
      lcd.clear();
      lcd.print("Calibrate mode");
      delay (1500);
      lcd.clear();
      lcd.print("press start when ready");
      delay (1500);
      
      while (digitalRead(10) == HIGH) {
      delay(50); // Wait for 50ms before checking again
      // Start the loop when the start button is pressed
      while (digitalRead(10) == LOW) {

      while (pulses < 250) {
        lcd.clear();
        lcd.print(pulses);
        delay(1);
        pulses++;
        digitalWrite(MOTOR_PIN, HIGH);
      }}


      if (pulses >=250) {

        digitalWrite(MOTOR_PIN, LOW);
        lcd.clear();
        lcd.print("ready");
        tone(SPEAKER_PIN, 1000, 2000); 
        delay (2500); 
        meters = 0;
        pulses = 0;
        lcd.clear();
        lcd.print("please input");
        lcd.setCursor(0, 1);
        lcd.print("length");
        delay (1500);
        lcd.clear();
        lcd.blink();
        delay (500);
        lcd.blink();
        


      }





    }
        

  }



  
    
    
  





    



void loop() {

lcd.print("loop");

if (digitalRead(PULSE_PIN) == LOW) {
  delay (100);
     pulseCount++;
     lcd.clear();
     lcd.print(pulseCount);
     }




  //if (digitalRead(10) == LOW) {
  //   pulseCount++;
  // lcd.clear();
  //   lcd.print("ten");
  //   delay (300);
  //   lcd.clear();
   //  }

  if (digitalRead(10) == LOW) {
    lcd.clear();
    lcd.print("roll");
    delay (300);
    lcd.clear();
    rollout(); // Call the rollout function
  }

  
  if (digitalRead(11) == LOW) {
     lcd.clear();
     lcd.print("eleven");
     delay (300);
     lcd.clear();
     }

   if (digitalRead(12) == LOW) {
     lcd.clear();
     lcd.print("twelve");
     delay (300);
     lcd.clear(); 
    }
  
   if (digitalRead(13) == LOW && !buttonPressed) { // If the button is pressed and not already pressed
    buttonPressed = true; // Set the buttonPressed flag
    startTime = millis(); // Store the start time
  }
    if (digitalRead(13) == HIGH) { 
      buttonPressed = false; 
    }
  
  if (buttonPressed && millis() - startTime >= 1000) { // If the button has been held down for 1000ms
    calibrate(); // Jump to calibrate function
    lcd.clear(); 
    buttonPressed = false; // Reset the buttonPressed flag
  }
  }