#include <LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

const int PIN_BTN_JUMP = 7;
const int PIN_BTN_RESET = 8;
const int PIN_BUZZER = 9;

byte dinoRun1[8] = { B00000, B00111, B00111, B10110, B11111, B01110, B01010, B00011 };
byte dinoRun2[8] = { B00000, B00111, B00111, B10110, B11111, B01110, B01010, B11000 };
byte dinoJump[8] = { B00111, B00111, B10110, B11111, B01110, B01010, B10001, B00000 };
byte cactus[8]   = { B00100, B00101, B10101, B10111, B11100, B00100, B00100, B00100 };

enum GameState { MENU, PLAYING, GAME_OVER };
GameState currentState = MENU;

int dinoRow = 1;
int obstacleCol = 15;
bool isJumping = false;
unsigned long jumpStartTime = 0;
const unsigned long JUMP_DURATION = 550;

// Μεταβλητές για Edge Detection (ανίχνευση νέου πατήματος)
bool lastJumpState = HIGH;
bool lastResetState = HIGH;

unsigned long lastTickTime = 0;
int gameSpeed = 200;
unsigned long score = 0;
bool legToggle = false;

void playJumpSound() { tone(PIN_BUZZER, 600, 40); }
void playGameOverSound() {
  tone(PIN_BUZZER, 300, 150);
  delay(160);
  tone(PIN_BUZZER, 150, 300);
}

void resetGame() {
  score = 0;
  gameSpeed = 200;
  obstacleCol = 15;
  dinoRow = 1;
  isJumping = false;
  currentState = PLAYING;
  lcd.clear();
}

void setup() {
  pinMode(PIN_BTN_JUMP, INPUT_PULLUP);
  pinMode(PIN_BTN_RESET, INPUT_PULLUP);
  pinMode(PIN_BUZZER, OUTPUT);

  lcd.begin(16, 2);
  lcd.createChar(0, dinoRun1);
  lcd.createChar(1, dinoRun2);
  lcd.createChar(2, dinoJump);
  lcd.createChar(3, cactus);

  lcd.clear();
  lcd.setCursor(1, 0);
  lcd.print("CARDBOARD-BOY");
  lcd.setCursor(1, 1);
  lcd.print("Press to Start");
}

void loop() {
  unsigned long currentMillis = millis();

  int currentJumpReading = digitalRead(PIN_BTN_JUMP);
  int currentResetReading = digitalRead(PIN_BTN_RESET);

  // Edge detection: LOW τώρα και HIGH στο προηγούμενο κύκλο (μόλις πατήθηκε)
  bool jumpJustPressed = (currentJumpReading == LOW && lastJumpState == HIGH);
  bool resetJustPressed = (currentResetReading == LOW && lastResetState == HIGH);

  lastJumpState = currentJumpReading;
  lastResetState = currentResetReading;

  if (currentState == MENU) {
    if (jumpJustPressed || resetJustPressed) resetGame();
    return;
  }

  if (currentState == GAME_OVER) {
    if (resetJustPressed || jumpJustPressed) resetGame();
    return;
  }

  // Άλμα μόνο τη στιγμή που πατιέται το κουμπί
  if (jumpJustPressed && !isJumping) {
    isJumping = true;
    jumpStartTime = currentMillis;
    dinoRow = 0;
    playJumpSound();
  }

  // Επιστροφή στο έδαφος μόλις περάσει ο χρόνος
  if (isJumping && (currentMillis - jumpStartTime >= JUMP_DURATION)) {
    isJumping = false;
    dinoRow = 1;
  }

  // Game Engine Frame Update
  if (currentMillis - lastTickTime >= (unsigned long)gameSpeed) {
    lastTickTime = currentMillis;
    score++;

    if (score % 25 == 0 && gameSpeed > 80) gameSpeed -= 10;

    obstacleCol--;
    if (obstacleCol < 0) obstacleCol = 15;

    // Collision check
    if (obstacleCol == 1 && dinoRow == 1) {
      currentState = GAME_OVER;
      playGameOverSound();
      lcd.clear();
      lcd.setCursor(3, 0);
      lcd.print("GAME OVER!");
      lcd.setCursor(2, 1);
      lcd.print("Score: ");
      lcd.print(score);
      return;
    }

    // Render frame
    lcd.clear();
    lcd.setCursor(1, dinoRow);
    if (isJumping) {
      lcd.write(byte(2));
    } else {
      lcd.write(legToggle ? byte(0) : byte(1));
      legToggle = !legToggle;
    }

    lcd.setCursor(obstacleCol, 1);
    lcd.write(byte(3));

    lcd.setCursor(10, 0);
    lcd.print("S:");
    lcd.print(score);
  }
}