Alien.js

const canvas = document.getElementById("gameCanvas");
const ctx = canvas.getContext("2d");
const scoreElement = document.getElementById("score");
const levelElement = document.getElementById("level");
const livesElement = document.getElementById("lives");
const startButton = document.getElementById("startButton");
const restartButton = document.getElementById("restartButton");
const gameOverElement = document.getElementById("gameOver");
const highScoreElement = document.getElementById("highScoreValue");
const levelSelect = document.getElementById('levelSelect');

// Load audio elements
const backgroundMusic = document.getElementById("backgroundMusic");
const hitSound = document.getElementById("hitSound");
const gameOverSound = document.getElementById("gameOverSound");

// Drop down menu
const instructionsTitle = document.getElementById("instructionsTitle");
const instructionsList = document.getElementById("instructionsList");

//volume icons
const volumeSlider = document.getElementById("volumeSlider");
const volumeIcon = document.querySelector("#volumeControl i"); 

volumeSlider.addEventListener("input", function () {
  backgroundMusic.volume = volumeSlider.value;

  if (volumeSlider.value == 0) {
    volumeIcon.classList.remove("fa-volume-up");
    volumeIcon.classList.add("fa-volume-mute");
    backgroundMusic.pause(); 
  } else {
    volumeIcon.classList.remove("fa-volume-mute");
    volumeIcon.classList.add("fa-volume-up");
    if (backgroundMusic.paused) {
      backgroundMusic.play();  
    }
  }
});

backgroundMusic.volume = volumeSlider.value;

startButton.addEventListener("click", function () {
  backgroundMusic.volume = volumeSlider.value;  // Set volume when game starts
});

// Drop down menu event listeners
instructionsTitle.addEventListener("click", () => {
  instructionsList.style.display = instructionsList.style.display === "block" ? "none" : "block";
});

canvas.width = 800;
canvas.height = 600;

let player, aliens, bullets, particles;
let score = 0;
let lives = 3;
let gameActive = false;
let keys = {};
let shootingInterval = null;
let gamePaused = false;
let previousGameState = null;
let level=1;

function setLevel(difficulty){
  switch(difficulty) {
    case 'easy':
        // Easy level settings
        level=1;
        break;
    case 'medium':
        // Medium level settings
        level=2;
        break;
    case 'hard':
        // Hard level settings
        level=3;
        break;
    default:
        level=1;
  }
}

class Player {
  constructor() {
    this.width = 60;
    this.height = 60;
    this.x = canvas.width / 2 - this.width / 2;
    this.y = canvas.height - this.height - 10;
    this.speed = 5;
  }

  draw() {
    ctx.fillStyle = "#4a4a4a";
    ctx.beginPath();
    ctx.moveTo(this.x + this.width / 2, this.y);
    ctx.lineTo(this.x, this.y + this.height);
    ctx.lineTo(this.x + this.width, this.y + this.height);
    ctx.closePath();
    ctx.fill();

    ctx.fillStyle = "#00ffff";
    ctx.beginPath();
    ctx.arc(
      this.x + this.width / 2,
      this.y + this.height / 3,
      this.width / 6,
      0,
      Math.PI * 2
    );
    ctx.fill();

    ctx.fillStyle = "#ff0000";
    ctx.fillRect(this.x - 10, this.y + this.height - 20, 10, 20);
    ctx.fillRect(this.x + this.width, this.y + this.height - 20, 10, 20);
  }

  move() {
    if ((keys.ArrowLeft || keys["KeyA"]) && this.x > 0)
      this.x -= this.speed;
    if ((keys.ArrowRight || keys["KeyD"]) && this.x < canvas.width - this.width)
      this.x += this.speed;
  }
}

class Alien {
  constructor(x, y, type) {
    this.width = 40;
    this.height = 40;
    this.x = x;
    this.y = y;
    this.speed = 1 + level * 0.5;
    this.type = type; // Assign the type
    this.points = points;
  }

  draw() {
    if (this.type === 'default') {
      ctx.fillStyle = "#32a852"; // Alien green color for the body
      ctx.beginPath();
      ctx.arc(
        this.x + this.width / 2, 
        this.y + this.height / 2, 
        this.width / 2, 
        0,
        Math.PI * 2 // Full circle
      );
      ctx.fill();
  
      // Eyes
      ctx.fillStyle = "#ffffff"; 
      ctx.beginPath();
      ctx.arc(this.x + this.width / 3, this.y + this.height / 3, this.width / 6, 0, Math.PI * 2);
      ctx.fill();
      ctx.beginPath();
      ctx.arc(this.x + (2 * this.width) / 3, this.y + this.height / 3, this.width / 6, 0, Math.PI * 2);
      ctx.fill();
  
      // Pupils
      ctx.fillStyle = "#000000";
      ctx.beginPath();
      ctx.arc(this.x + this.width / 3, this.y + this.height / 3, this.width / 12, 0, Math.PI * 2);
      ctx.fill();
      ctx.beginPath();
      ctx.arc(this.x + (2 * this.width) / 3, this.y + this.height / 3, this.width / 12, 0, Math.PI * 2);
      ctx.fill();
  
      // Antennae
      ctx.strokeStyle = "#ff00ff"; 
      ctx.lineWidth = 2;
      ctx.beginPath();
      ctx.moveTo(this.x + this.width / 3, this.y); 
      ctx.lineTo(this.x + this.width / 3, this.y - this.height / 4);
      ctx.stroke();
  
      ctx.beginPath();
      ctx.moveTo(this.x + (2 * this.width) / 3, this.y);
      ctx.lineTo(this.x + (2 * this.width) / 3, this.y - this.height / 4);
      ctx.stroke();
    } 
    else if (this.type === 'terrific') {
      // Terrific Alien appearance
      ctx.fillStyle = "#8b0000"; // Dark red body
      ctx.beginPath();
      ctx.arc(this.x + this.width / 2, this.y + this.height / 2, this.width / 2, 0, Math.PI * 2);
      ctx.fill();

      // Eyes (one misaligned pupil to look scary)
      ctx.fillStyle = "#ffffff";
      ctx.beginPath();
      ctx.arc(this.x + this.width / 3, this.y + this.height / 3, this.width / 6, 0, Math.PI * 2);
      ctx.fill();

      ctx.beginPath();
      ctx.arc(this.x + (2 * this.width) / 3, this.y + this.height / 3, this.width / 6, 0, Math.PI * 2);
      ctx.fill();

      // Pupils (misaligned one)
      ctx.fillStyle = "#000000";
      // Left pupil
      ctx.beginPath();
      ctx.arc(this.x + this.width / 3, this.y + this.height / 3, this.width / 12, 0, Math.PI * 2);
      ctx.fill();

      // Right pupil (slightly offset)
      ctx.beginPath();
      ctx.arc(this.x + (2 * this.width) / 3 + 5, this.y + this.height / 3 + 5, this.width / 12, 0, Math.PI * 2);
      ctx.fill();

      // Add horns
      ctx.strokeStyle = "#8b0000"; 
      ctx.lineWidth = 3;
      ctx.beginPath();
      ctx.moveTo(this.x + this.width / 4, this.y); 
      ctx.lineTo(this.x + this.width / 5, this.y - this.height / 4); // Left horn
      ctx.stroke();

      ctx.beginPath();
      ctx.moveTo(this.x + (3 * this.width) / 4, this.y); 
      ctx.lineTo(this.x + (4 * this.width) / 5, this.y - this.height / 4); // Left horn
      ctx.stroke();

      // Add jagged teeth
      ctx.fillStyle = "#ffffff";
      ctx.beginPath();
      ctx.moveTo(this.x + this.width / 4, this.y + (2 * this.height) / 3); // Left tooth
      ctx.lineTo(this.x + this.width / 2, this.y + (3 * this.height) / 4); // Middle tooth
      ctx.lineTo(this.x + (3 * this.width) / 4, this.y + (2 * this.height) / 3); // Right tooth
      ctx.closePath();
      ctx.fill();

      // Add scar (diagonal line across face)
      ctx.strokeStyle = "#ff0000";
      ctx.lineWidth = 3;
      ctx.beginPath();
      ctx.moveTo(this.x + this.width / 4, this.y + this.height / 2);
      ctx.lineTo(this.x + (3 * this.width) / 4, this.y + this.height / 3);
      ctx.stroke();
    }
    else if (this.type === 'cute') {
      // Cute Alien appearance
      ctx.fillStyle = "#FF69B4"; 
      ctx.beginPath();
      ctx.arc(this.x + this.width / 2, this.y + this.height / 2, this.width / 2, 0, Math.PI * 2);
      ctx.fill();
      
      // Big round eyes
      ctx.fillStyle = "#ffffff"; 
      ctx.beginPath();
      ctx.arc(this.x + this.width / 4, this.y + this.height / 2.5, this.width / 4, 0, Math.PI * 2);
      ctx.fill();
      ctx.beginPath();
      ctx.arc(this.x + (3 * this.width) / 4, this.y + this.height / 2.5, this.width / 4, 0, Math.PI * 2);
      ctx.fill();
      
      // Big black pupils
      ctx.fillStyle = "#000000";
      ctx.beginPath();
      ctx.arc(this.x + this.width / 4, this.y + this.height / 2.5, this.width / 8, 0, Math.PI * 2);
      ctx.fill();
      ctx.beginPath();
      ctx.arc(this.x + (3 * this.width) / 4, this.y + this.height / 2.5, this.width / 8, 0, Math.PI * 2);
      ctx.fill();
      
      // Cute blushing cheeks (small pink circles)
      ctx.fillStyle = "#FFC0CB";
      ctx.beginPath();
      ctx.arc(this.x + this.width / 4, this.y + (2 * this.height) / 3, this.width / 8, 0, Math.PI * 2);
      ctx.fill();
      ctx.beginPath();
      ctx.arc(this.x + (3 * this.width) / 4, this.y + (2 * this.height) / 3, this.width / 8, 0, Math.PI * 2);
      ctx.fill();

      ctx.fillStyle = "#FF0000";
      ctx.fillStyle = "#FF0000";
      // Horns
      ctx.strokeStyle = "#FF69B4";
      ctx.lineWidth = 2;
      ctx.beginPath();
      ctx.moveTo(this.x + this.width / 4, this.y);
      ctx.lineTo(this.x + this.width / 5, this.y - this.height / 4); // Left horn
      ctx.stroke();

      ctx.beginPath();
      ctx.moveTo(this.x + (3 * this.width) / 4, this.y);
      ctx.lineTo(this.x + (4 * this.width) / 5, this.y - this.height / 4); // Right horn
      ctx.stroke();
      
    } 
    else if (this.type === 'robotic') {
      // Robotic Alien appearance
      ctx.fillStyle = "#808080"; // Gray for metal body
        ctx.beginPath();
        ctx.arc(this.x + this.width / 2, this.y + this.height / 2, this.width / 2, 0, Math.PI * 2);
        ctx.fill();

        // Eyes
        ctx.fillStyle = "#ff0000"; // Red robotic eyes
        ctx.beginPath();
        ctx.arc(this.x + this.width / 3, this.y + this.height / 3, this.width / 6, 0, Math.PI * 2);
        ctx.fill();

        ctx.beginPath();
        ctx.arc(this.x + (2 * this.width) / 3, this.y + this.height / 3, this.width / 6, 0, Math.PI * 2);
        ctx.fill();

        // Pupils
        ctx.fillStyle = "#000000";
        ctx.beginPath();
        ctx.arc(this.x + this.width / 3, this.y + this.height / 3, this.width / 12, 0, Math.PI * 2);
        ctx.fill();

        ctx.beginPath();
        ctx.arc(this.x + (2 * this.width) / 3, this.y + this.height / 3, this.width / 12, 0, Math.PI * 2);
        ctx.fill();

        // antennae with lights
        ctx.strokeStyle = "#ff0000"; 
        ctx.lineWidth = 3;
        // Left antenna
        ctx.beginPath();
        ctx.moveTo(this.x + this.width / 3, this.y);
        ctx.lineTo(this.x + this.width / 3, this.y - this.height / 4);
        ctx.stroke();

        // Red light on top
        ctx.fillStyle = "#ff0000";
        ctx.beginPath();
        ctx.arc(this.x + this.width / 3, this.y - this.height / 4 - 5, 5, 0, Math.PI * 2);
        ctx.fill();

        // Right antenna
        ctx.beginPath();
        ctx.moveTo(this.x + (2 * this.width) / 3, this.y);
        ctx.lineTo(this.x + (2 * this.width) / 3, this.y - this.height / 4);
        ctx.stroke();

        // Red light on top
        ctx.fillStyle = "#ff0000";
        ctx.beginPath();
        ctx.arc(this.x + (2 * this.width) / 3, this.y - this.height / 4 - 5, 5, 0, Math.PI * 2);
        ctx.fill();

        // mouth
        ctx.fillStyle = "#000000";
        ctx.fillRect(this.x + this.width / 3, this.y + (2 * this.height) / 3, this.width / 3, this.height / 6);
    } 
    else if (this.type === 'ghostly') {
      //body
        ctx.fillStyle = "#F8F8FF"; 
        ctx.beginPath();
        ctx.arc(this.x + this.width / 2, this.y + this.height / 2, this.width / 2, 0, Math.PI * 2);
        ctx.fill();
        
        // Eyes 
        ctx.fillStyle = "#000000";
        ctx.beginPath();
        ctx.ellipse(this.x + this.width / 4, this.y + this.height / 3, this.width / 8, this.height / 4, 0, 0, Math.PI * 2);
        ctx.fill();
        ctx.beginPath();
        ctx.ellipse(this.x + (3 * this.width) / 4, this.y + this.height / 3, this.width / 8, this.height / 4, 0, 0, Math.PI * 2);
        ctx.fill();
        
        // Tail
        ctx.fillStyle = "#F8F8FF";
        ctx.beginPath();
        ctx.moveTo(this.x, this.y + this.height);
        ctx.quadraticCurveTo(this.x + this.width / 2, this.y + this.height + 10, this.x + this.width, this.y + this.height);
        ctx.fill();
    }
  }

  move() {
    this.y += this.speed;
  }
}

class Bullet {
  constructor(x, y) {
    this.width = 5;
    this.height = 15;
    this.x = x;
    this.y = y;
    this.speed = 7;
  }

  draw() {
    ctx.fillStyle = "#0ff";
    ctx.fillRect(this.x, this.y, this.width, this.height);
  }

  move() {
    this.y -= this.speed;
  }
}

class Particle {
  constructor(x, y) {
    this.x = x;
    this.y = y;
    this.size = Math.random() * 5 + 1;
    this.speedX = Math.random() * 4 - 2;
    this.speedY = Math.random() * 4 - 2;
    this.color = `hsl(${Math.random() * 360}, 100%, 50%)`;
  }

  draw() {
    ctx.fillStyle = this.color;
    ctx.beginPath();
    ctx.arc(this.x, this.y, this.size, 0, Math.PI * 2);
    ctx.fill();
  }

  update() {
    this.x += this.speedX;
    this.y += this.speedY;
    if (this.size > 0.2) this.size -= 0.1;
  }
}

function initGame() {
  player = new Player();
  aliens = [];
  bullets = [];
  particles = [];
  score = 0;
  let difficulty=levelSelect.value;
  setLevel(difficulty);
  lives = 3;
  scoreElement.textContent = score;
  levelElement.textContent = level;
  livesElement.textContent = lives;
  spawnAliens();
}

function spawnAliens() {
  for (let i = 0; i < 5 + level; i++) {
    const alienType = Math.random(); // Random number between 0 and 1
    
    // Equal probability for all 5 types
    let type;
    let points;

    if (alienType < 1 / 5) {
      type = "default";
      points = 10; // Points for default aliens
    } else if (alienType < 2 / 5) {
      type = "terrific";
      points = 20; // Points for terrific aliens
    } else if (alienType < 3 / 5) {
      type = "cute";
      points = 15; // Points for cute aliens
    } else if (alienType < 4 / 5) {
      type = "robotic";
      points = 25; // Points for robotic aliens
    } else {
      type = "ghostly";
      points = 30; // Points for ghostly aliens
    }

    // Random x position for the alien
    const x = Math.random() * (canvas.width - 40); // Adjust for width of alien
    const y = 0; // Start from the top of the canvas

    // Create a new alien instance
    const alien = new Alien(x, y, type);
    alien.points = points; // Assign points to the alien

    // Store the alien in an array for tracking
    aliens.push(alien);
  }
}


function update() {
  ctx.clearRect(0, 0, canvas.width, canvas.height);

  player.move();
  player.draw();

  aliens.forEach((alien, alienIndex) => {
    alien.draw();
    alien.move();

    if (alien.y > canvas.height) {
      aliens.splice(alienIndex, 1);
      lives--;
      livesElement.textContent = lives;
      if (lives === 1) {
        // Show the warning message
        const warningMessage = document.getElementById("warningMessage");
        warningMessage.style.display = "block"; // Show the message

        // Hide the warning after 1 seconds
        setTimeout(() => {
          warningMessage.style.display = "none";
        }, 1000);
      } else if (lives <= 0) gameOver();
    }

    if (
      player.x < alien.x + alien.width &&
      player.x + player.width > alien.x &&
      player.y < alien.y + alien.height &&
      player.y + player.height > alien.y
    ) {
      lives--;
      livesElement.textContent = lives;
      aliens.splice(alienIndex, 1);
      if (lives <= 0) gameOver();
      else if (lives === 1) {
        // Show the warning message
        const warningMessage = document.getElementById("warningMessage");
        warningMessage.style.display = "block"; // Show the message

        // Hide the warning after 1 seconds
        setTimeout(() => {
          warningMessage.style.display = "none";
        }, 1000);
      }
    }

    bullets.forEach((bullet, bulletIndex) => {
      if (
        bullet.x < alien.x + alien.width &&
        bullet.x + bullet.width > alien.x &&
        bullet.y < alien.y + alien.height &&
        bullet.y + bullet.height > alien.y
      ) {
        // Generate particles for the hit effect
        for (let i = 0; i < 15; i++) {
          particles.push(
            new Particle(alien.x + alien.width / 2, alien.y + alien.height / 2)
          );
        }
    
        // Remove alien and bullet after collision
        aliens.splice(alienIndex, 1);
        bullets.splice(bulletIndex, 1);
    
        // Increase score based on the alien's point value
        score += alien.points; // Update score by alien's point value
        scoreElement.textContent = score; // Update score display
    
        // Play hit sound
        hitSound.currentTime = 0;
        hitSound.play();
      }
    });
  })    

  bullets.forEach((bullet, bulletIndex) => {
    bullet.draw();
    bullet.move();
    if (bullet.y < 0) bullets.splice(bulletIndex, 1);
  });

  particles.forEach((particle, particleIndex) => {
    particle.draw();
    particle.update();
    if (particle.size <= 0.2) particles.splice(particleIndex, 1);
  });

  if (gameActive && !gamePaused) requestAnimationFrame(update);
}

function shootBullet() {
  bullets.push(
    new Bullet(player.x + player.width / 2 - 2.5, player.y)
  );
}

function startGame() {
  gameActive = true;
  gamePaused = false;
  gameOverElement.style.display = "none";
  restartButton.style.display = "none";
  startButton.style.display = "none";
  backgroundMusic.currentTime = 0;
  backgroundMusic.loop = true;
  backgroundMusic.play();
  
  initGame();
  update();
}


// Retrieve the last high score from localStorage or set it to 0 if none exists
let highScore = localStorage.getItem('highScore') ? parseInt(localStorage.getItem('highScore')) : 0;

// Display the initial high score
highScoreElement.textContent = highScore;

function gameOver() {
  gameActive = false;
  gamePaused = true;
  gameOverElement.style.display = "block";
  restartButton.style.display = "block";
  gameOverSound.play();
  backgroundMusic.pause();
  
  // Check if current score is higher than the stored high score
  if (score > highScore) {
    highScore = score;
    highScoreElement.textContent = highScore;

    // Update the high score in localStorage
    localStorage.setItem('highScore', highScore);
  }
}



// Function to restart the game
function restart() {
  gamePaused = false;
  gameActive = true;
  gameOverElement.style.display = "none";
  restartButton.style.display = "none";
  initGame(); // Reinitialize the game state
  backgroundMusic.play(); // Play background music when restarting the game
  update(); // Start updating the game
}

// Event listener for starting the game
startButton.addEventListener("click", startGame);
restartButton.addEventListener("click", restart);

// Shooting control: keydown and keyup consolidated
document.addEventListener("keydown", (e) => {
  keys[e.code] = true;

  // Shooting with spacebar
  if (e.code === "Space" && !shootingInterval) {
    shootBullet(); // Shoot immediately
    shootingInterval = setInterval(shootBullet, 300); // Continuous shooting every 300ms
  }

  // Pause/Resume with "P" key
  if (e.code === "KeyP") {
    togglePause();
  }
});

document.addEventListener("keyup", (e) => {
  keys[e.code] = false;

  // Stop shooting when spacebar is released
  if (e.code === "Space") {
    clearInterval(shootingInterval);
    shootingInterval = null;
  }
});

// Function to toggle pause and resume
function togglePause() {
  if (!gamePaused) {
    gamePaused = true;
    saveGameState(); // Save game state when pausing
    backgroundMusic.pause(); // Pause music when game is paused
  } else {
    gamePaused = false;
    restoreGameState(); // Restore game state when resuming
    backgroundMusic.play(); // Resume music
    update(); // Resume game updates
  }
}

// Function to save the game state
function saveGameState() {
  previousGameState = {
    score,
    level,
    lives,
    aliens: aliens.map((alien) => ({ x: alien.x, y: alien.y })), // Save alien positions
    bullets: bullets.map((bullet) => ({ x: bullet.x, y: bullet.y })), // Save bullet positions
    playerPosition: { x: player.x, y: player.y }, // Save player position
  };
}

// Function to restore the game state
function restoreGameState() {
  if (previousGameState) {
    score = previousGameState.score;
    level = previousGameState.level;
    lives = previousGameState.lives;
    aliens = previousGameState.aliens.map((pos) => new Alien(pos.x, pos.y)); // Restore aliens
    bullets = previousGameState.bullets.map((pos) => new Bullet(pos.x, pos.y)); // Restore bullets
    player.x = previousGameState.playerPosition.x; // Restore player position
    player.y = previousGameState.playerPosition.y;

    scoreElement.textContent = score;
    levelElement.textContent = level;
    livesElement.textContent = lives;
  }
}

// Touch and mouse controls for mobile and desktop
const leftButton = document.getElementById("leftButton");
const rightButton = document.getElementById("rightButton");
const fireButton = document.getElementById("fireButton");

// Movement button event listeners (touch and mouse)
function handleMoveButton(button, direction) {
  button.addEventListener("mousedown", () => {
    keys[direction] = true;
  });
  button.addEventListener("mouseup", () => {
    keys[direction] = false;
  });
  button.addEventListener("touchstart", (e) => {
    e.preventDefault();
    keys[direction] = true;
  });
  button.addEventListener("touchend", () => {
    keys[direction] = false;
  });
}

// Handle left and right movement
handleMoveButton(leftButton, "ArrowLeft");
handleMoveButton(rightButton, "ArrowRight");

// Shooting with fire button (touch and mouse)
fireButton.addEventListener("mousedown", () => {
  if (gameActive && !shootingInterval) {
    shootBullet();
    shootingInterval = setInterval(shootBullet, 300); // Continuous shooting
  }
});
fireButton.addEventListener("mouseup", () => {
  clearInterval(shootingInterval);
  shootingInterval = null;
});
fireButton.addEventListener("touchstart", (e) => {
  e.preventDefault();
  if (gameActive && !shootingInterval) {
    shootBullet();
    shootingInterval = setInterval(shootBullet, 300);
  }
});
fireButton.addEventListener("touchend", () => {
  clearInterval(shootingInterval);
  shootingInterval = null;
});

// Personalized welcome message based on saved name in localStorage
document.addEventListener("DOMContentLoaded", () => {
  const personData = localStorage.getItem("signupData");

  if (personData) {
    const person = JSON.parse(personData);
    const name = person.fullName || "Adventurer";
    document.getElementById("displayName").textContent = `Welcome to the game, ${name}!`;
  } else {
    document.getElementById("displayName").textContent = "Welcome to the game, Adventurer!";
  }
});