#include <LiquidCrystal_I2C.h>
#include <Servo.h>
#include <Stepper.h>
#include <TimeLib.h>

const int buttonFR = 53;
const int buttonBK = 51;
const int buttonLH = 49;
const int buttonRH = 47;
const int buttonUP = 45;

const int buttonStepperRPMspeed = 43;
const int buttonCoin = 45;
const int buttonStart = 47;
const int servoPower = 8;

const int ledPin = 12;
const int ledPinCoin = 11;

// setup 3 speeds for the stepper motors
int StepperRPM = 60;
int StepperRPMFast = 90;
int StepperRPMSlow = 60;

// create a state of LED and turn it off
int ledStateStart = LOW;
int ledStateCoin = LOW;

// create a state for each button
int buttonStateFR = HIGH;
int buttonStateBK = HIGH;
int buttonStateLH = HIGH;
int buttonStateRH = HIGH;
int buttonStateUP = HIGH;
int buttonStateDN = HIGH;
int buttonStateSPEED = HIGH;
int buttonStateCOIN = HIGH;
int buttonStateSTART = HIGH;

// usually we use int for variables but sometimes the value for the variable can be very long, in such case we need to use (long)
long intervalStart = 500;
long intervalIdle = 2000;
long previousMillis = 0;

// coordination variables
int x = 0;
int y = 0;

// stepper setup
const int stepsPerRevolution = 200;
Stepper Xstepper(stepsPerRevolution, 30, 32, 34, 36);
Stepper Ystepper(stepsPerRevolution, 22, 24, 26, 28);
Stepper Zstepper(stepsPerRevolution, 38, 40, 42, 44);

//setup the servo and the analog POT
Servo myServo;
int potPin = 5;

//timing
unsigned int timelimit = 5;

//setup the LED
LiquidCrystal_12C LCD = LiquidCrystal_12C(0x27, 20, 4);

void setup() {
  // put your setup code here, to run once:
LCD.begin(20, 4)
pinMode(buttonFR, INPUT_PULLUP);
pinMode(buttonBK, INPUT_PULLUP);
pinMode(buttonLH, INPUT_PULLUP);
pinMode(buttonRH, INPUT_PULLUP);
pinMode(buttonUP, INPUT_PULLUP);
pinMode(buttonDN, INPUT_PULLUP);

pinMode(buttonStepperRPMSpeed, INPUT_PULLUP);
pinMode(buttonCoin, INPUT_PULLUP);
pinMode(buttonStart, INPUT_PULLUP);

pinMode(servoPower, OUTPUT);
pinMode(ledPin, OUTPUT);
pinMode(ledPinCoin, OUTPUT);

//set all pins to LOW
digitalWrite(buttonFR, LOW)
digitalWrite(buttonBK, LOW)
digitalWrite(buttonLH, LOW)
digitalWrite(buttonRH, LOW)
digitalWrite(buttonUP, LOW)
digitalWrite(buttonDN, LOW)
digitalWrite(buttonStepperRPMSpeed, LOW)
digitalWrite(buttonCoin, LOW)
digitalWrite(buttonStart, LOW)
digitalWrite(servoPower, LOW)
digitalWrite(ledPin, LOW)
digitalWrite(ledPinCoin, LOW)

// assign pin name for the servo
myServo.attach(13);

}

void loop() {
  // game idle (waiting state)
  buttonStateCoin = digitalRead(buttonCoin);

  unsigned long currentMillis = millis(); // used for refreshing the game states

  if (currentMillis - previousMillis > intervalIdle){
    previousMillis = currentMillis;
    if (y == 0){
      y = y+1;
      x = x+1;
      lcd.clear();
      lcd.setCursor(5, y);
      lcd.print("GameOver");
      lcd.setCursor(0, y+1);
      lcd.print("Insert a coin to play");
      lcd.setCursor(0, y+1);
    }
  else{
    lcd.clear();
    lcd.setCursor(5, y+1);
    lcd.print("GameOver");
    lcd.setCursor(0, y);
    lcd.print("Insert a coin to play");
    lcd.setCursor(0, 3); 
    y = y=1;
    x = x=1;

    }
  }

  if(second() == timelimit){
    lcd.clear();
    lcd.setCursor(2, 1);
    lcd.print("Time Expired");
    myServo.write(0);  // will release the claw
    delay(500);
    digitalWrite(servoPower, LOW); // turn off the servo power
  }


  // when coin been inserted
  if(buttonStateCoin == LOW){ // this means a coin has been inserted
    lcd.clear();
    do {
      unsigned long currentMillis = millis();
      lcd.setCursor(2,0);
      lcd.print("coin inserted");
      lcd.setCursor(1, 1);
      lcd.print("Push Start to play");
      lcd.setCursor(5, 2);
      lcd.print("Good Luck");
    }
    if (currentMillis - previousMillis > intervalIdle){
      previousMillis = currentMillis;
      if(ledStateStart == LOW){
        ledStateStart = HIGH;
      }
      else{
        ledStateStart = LOW;
        digitalWrite(ledPin = ledStateState);
      }
    }
    buttonStateStart = digitalWrite(buttonStart); // wait for player to push start
  }
  while(buttonStateStart == HIGH);  
  runGame(); // exit the loop and call custom function RUNGAME
}