/**** 
* Classes
****/ 
// Ammo class
var Ammo = Container.expand(function () {
	var self = Container.call(this);
	var ammoGraphics = self.attachAsset('ammo', {
		anchorX: 0.5,
		anchorY: 0.5
	});
});
// Define constants for ammo UI positioning and spacing
// AmmoUI class
var AmmoUI = Container.expand(function () {
	var self = Container.call(this);
	self.ammoCount = 10;
	self.ammoDisplay = [];
	self.init = function () {
		for (var i = 0; i < self.ammoCount; i++) {
			var ammo = new Ammo();
			ammo.x = AMMO_X_POSITION; // Position to the left
			ammo.y = AMMO_Y_START_POSITION - i * AMMO_SPACING; // Stack vertically from bottom to top
			self.ammoDisplay.push(ammo);
			self.addChild(ammo);
		}
	};
	self.decreaseAmmo = function () {
		if (self.ammoCount > 0) {
			self.ammoCount--;
			var ammoToRemove = self.ammoDisplay.pop();
			ammoToRemove.destroy();
		}
	};
	self.increaseAmmo = function () {
		if (self.ammoCount < 10) {
			self.ammoCount++;
			var newAmmoDisplay = new Ammo();
			newAmmoDisplay.x = AMMO_X_POSITION; // Position to the left
			newAmmoDisplay.y = AMMO_Y_START_POSITION - (self.ammoCount - 1) * AMMO_SPACING; // Stack vertically from bottom to top
			self.ammoDisplay.push(newAmmoDisplay);
			self.addChild(newAmmoDisplay);
		}
	};
	self.init();
});
// BackgroundContainer class
var BackgroundContainer = Container.expand(function () {
	var self = Container.call(this);
});
//<Assets used in the game will automatically appear here>
// Bullet class
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 10;
	self.direction = {
		x: 0,
		y: -1
	}; // Default direction
	self.targetedEnemy = null; // Add a flag to store the targeted enemy
	self.update = function () {
		self.x += self.direction.x * self.speed;
		self.y += self.direction.y * self.speed;
	};
});
// Enemy class
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 1;
	self.acceleration = 0.0075; // Increase acceleration property
	self.scoreIncreased = false; // Add a flag to check if the score has been increased
	self.update = function () {
		var dx = player.x - self.x;
		var dy = player.y - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		if (distance > self.speed) {
			self.speed += self.acceleration; // Increase speed by acceleration
			self.x += dx * self.speed / distance;
			self.y += dy * self.speed / distance;
		}
	};
});
// Explosion class
var Explosion = Container.expand(function () {
	var self = Container.call(this);
	var explosionGraphics = self.attachAsset('explosion', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 0.01,
		scaleY: 0.01
	});
	self.expandTime = 150; // 150 milliseconds
	self.startTime = Date.now();
	self.hitboxIntersects = function (target) {
		var selfBounds = self.getBounds();
		var targetBounds = target.getBounds();
		return selfBounds.x < targetBounds.x + targetBounds.width && selfBounds.x + selfBounds.width > targetBounds.x && selfBounds.y < targetBounds.y + targetBounds.height && selfBounds.y + selfBounds.height > targetBounds.y;
	};
	self.update = function () {
		var elapsedTime = Date.now() - self.startTime;
		var scale = Math.min(1, elapsedTime / self.expandTime);
		explosionGraphics.scale.set(scale, scale);
		if (scale >= 1) {
			// Check for collisions with enemies
			for (var i = enemySpawners.length - 1; i >= 0; i--) {
				if (self.hitboxIntersects(enemySpawners[i])) {
					var newExplosion = new Explosion();
					newExplosion.x = enemySpawners[i].x;
					newExplosion.y = enemySpawners[i].y;
					midgroundContainer.addChild(newExplosion);
					if (!enemySpawners[i].scoreIncreased) {
						LK.setScore(LK.getScore() + 1);
						scoreTxt.setText(LK.getScore());
						enemySpawners[i].scoreIncreased = true;
					}
					enemySpawners[i].destroy();
					enemySpawners.splice(i, 1);
				}
			}
			LK.setScore(LK.getScore() + 1);
			scoreTxt.setText(LK.getScore());
			self.destroy();
		}
	};
});
// ForegroundContainer class
var ForegroundContainer = Container.expand(function () {
	var self = Container.call(this);
});
// MidgroundContainer class
var MidgroundContainer = Container.expand(function () {
	var self = Container.call(this);
});
// Obstacle class
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	var obstacleGraphics = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 5;
	self.update = function () {
		self.x += self.direction.x * self.speed;
		self.y += self.direction.y * self.speed;
	};
});
// Player class
var Player = Container.expand(function () {
	var self = Container.call(this);
	var playerGraphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.shoot = function () {
		var newBullet = new Bullet();
		newBullet.x = self.x;
		newBullet.y = self.y;
		// Find the closest enemy that hasn't been targeted
		var closestEnemy = null;
		var closestDistance = Infinity;
		for (var i = 0; i < enemySpawners.length; i++) {
			// Check if the enemy is within the screen bounds
			if (enemySpawners[i].x < 0 || enemySpawners[i].x > 2048 || enemySpawners[i].y < 0 || enemySpawners[i].y > 2732) {
				continue; // Skip enemies outside the screen area
			}
			var alreadyTargeted = bullets.some(function (bullet) {
				return bullet.targetedEnemy === enemySpawners[i];
			});
			if (alreadyTargeted) {
				continue; // Skip already targeted enemies
			}
			var distance = Math.sqrt(Math.pow(enemySpawners[i].x - self.x, 2) + Math.pow(enemySpawners[i].y - self.y, 2));
			if (distance < closestDistance) {
				closestEnemy = enemySpawners[i];
				closestDistance = distance;
			}
		}
		if (closestEnemy === null) {
			return; // No enemies to target
		}
		if (ammoUI.ammoCount <= 0) {
			console.log("Out of ammo!");
			return; // Out of ammo
		}
		ammoUI.decreaseAmmo();
		// Set the bullet's direction towards the closest enemy
		var dx = closestEnemy.x - self.x;
		var dy = closestEnemy.y - self.y;
		var magnitude = Math.sqrt(dx * dx + dy * dy);
		newBullet.direction = {
			x: dx / magnitude,
			y: dy / magnitude
		};
		newBullet.targetedEnemy = closestEnemy; // Mark the enemy as targeted
		bullets.push(newBullet);
		midgroundContainer.addChild(newBullet);
	};
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000000 //Init game with black background 
});

/**** 
* Game Code
****/ 
// Initialize arrays and variables
// Define constants for ammo UI positioning and spacing
var AMMO_X_POSITION = 100;
var AMMO_Y_START_POSITION = 2732 - 60;
var AMMO_SPACING = 80;
var AMMO_PADDING_X = 200;
var AMMO_PADDING_Y = 400;
var AMMO_SPAWN_WIDTH = 2048 - 1200;
var AMMO_SPAWN_HEIGHT = 2732 - 1600;
var AMMO_MIN_DISTANCE = 700;
var bullets = [];
var obstacles = [];
var enemySpawners = [];
var ammos = [];
var backgroundContainer = game.addChild(new BackgroundContainer());
var foregroundContainer = game.addChild(new ForegroundContainer());
var ammoUI = foregroundContainer.addChild(new AmmoUI());
var midgroundContainer = game.addChild(new MidgroundContainer());
var player = midgroundContainer.addChild(new Player());
player.x = 2048 / 2;
player.y = 2732 - 200;
for (var i = 0; i < bullets.length; i++) {
	midgroundContainer.addChild(bullets[i]);
}
for (var i = 0; i < enemySpawners.length; i++) {
	midgroundContainer.addChild(enemySpawners[i]);
}
var scoreTxt = new Text2('0', {
	size: 150,
	fill: "#ffffff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Handle touch down event
game.down = function (x, y, obj) {
	player.shoot();
};
// Update game state
game.update = function () {
	// Player moves towards the closest Ammo
	if (ammos.length > 0) {
		var closestAmmo = null;
		var closestDistance = Infinity;
		for (var i = 0; i < ammos.length; i++) {
			var dx = ammos[i].x - player.x;
			var dy = ammos[i].y - player.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance < closestDistance) {
				closestAmmo = ammos[i];
				closestDistance = distance;
			}
		}
		if (closestAmmo !== null) {
			var dx = closestAmmo.x - player.x;
			var dy = closestAmmo.y - player.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			var speed = 7;
			if (distance > speed) {
				player.x += dx * speed / distance;
				player.y += dy * speed / distance;
			}
		}
	}
	// Update bullets
	for (var i = bullets.length - 1; i >= 0; i--) {
		bullets[i].update();
		if (bullets[i].y < -50) {
			bullets[i].destroy();
			bullets.splice(i, 1);
		}
	}
	// Update obstacles
	for (var j = obstacles.length - 1; j >= 0; j--) {
		obstacles[j].update();
		if (obstacles[j].y > 2732 + 50) {
			obstacles[j].destroy();
			obstacles.splice(j, 1);
		}
	}
	// Update explosions
	for (var e = midgroundContainer.children.length - 1; e >= 0; e--) {
		if (midgroundContainer.children[e] instanceof Explosion) {
			midgroundContainer.children[e].update();
		}
	}
	// Check for collisions
	for (var k = bullets.length - 1; k >= 0; k--) {
		for (var l = enemySpawners.length - 1; l >= 0; l--) {
			// Check if the enemy is within the screen bounds
			if (enemySpawners[l].x >= 0 && enemySpawners[l].x <= 2048 && enemySpawners[l].y >= 0 && enemySpawners[l].y <= 2732 && bullets[k].intersects(enemySpawners[l])) {
				bullets[k].destroy();
				var explosion = new Explosion();
				explosion.x = enemySpawners[l].x;
				explosion.y = enemySpawners[l].y;
				midgroundContainer.addChild(explosion);
				enemySpawners[l].destroy();
				bullets.splice(k, 1);
				enemySpawners.splice(l, 1);
				// Score update removed from bullet collision
				break;
			}
		}
	}
	// Spawn new enemy spawners
	if (LK.ticks % Math.max(10, 40 - Math.floor(LK.getScore() * 0.25)) == 0) {
		var newEnemy = new Enemy();
		var edge = Math.floor(Math.random() * 4);
		switch (edge) {
			case 0:
				// Top edge
				newEnemy.x = Math.random() * 2048;
				newEnemy.y = -50;
				break;
			case 1:
				// Right edge
				newEnemy.x = 2048 + 50;
				newEnemy.y = Math.random() * 2732;
				break;
			case 2:
				// Bottom edge
				newEnemy.x = Math.random() * 2048;
				newEnemy.y = 2732 + 50;
				break;
			case 3:
				// Left edge
				newEnemy.x = -50;
				newEnemy.y = Math.random() * 2732;
				break;
		}
		enemySpawners.push(newEnemy);
		midgroundContainer.addChild(newEnemy);
	}
	// Generate new ammo to maintain 2 on the screen
	if (ammos.length < 2) {
		while (ammos.length < 2) {
			var newAmmo = new Ammo();
			var validPosition = false;
			while (!validPosition) {
				newAmmo.x = AMMO_PADDING_X + Math.random() * AMMO_SPAWN_WIDTH;
				newAmmo.y = AMMO_PADDING_Y + Math.random() * AMMO_SPAWN_HEIGHT;
				validPosition = true;
				for (var i = 0; i < ammos.length; i++) {
					var dx = newAmmo.x - ammos[i].x;
					var dy = newAmmo.y - ammos[i].y;
					var distance = Math.sqrt(dx * dx + dy * dy);
					if (distance < AMMO_MIN_DISTANCE) {
						validPosition = false;
						break;
					}
				}
			}
			ammos.push(newAmmo);
			midgroundContainer.addChild(newAmmo);
		}
	}
	// Check for game over
	for (var m = obstacles.length - 1; m >= 0; m--) {
		if (obstacles[m].intersects(player)) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
	}
	for (var n = enemySpawners.length - 1; n >= 0; n--) {
		if (enemySpawners[n].intersects(player)) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
	}
	// Check for Ammo collection
	for (var n = ammos.length - 1; n >= 0; n--) {
		if (ammos[n].intersects(player)) {
			ammos[n].destroy();
			ammos.splice(n, 1);
			ammoUI.increaseAmmo();
			// Generate new ammo to maintain 3 on the screen
			var newAmmo = new Ammo();
			var validPosition = false;
			while (!validPosition) {
				newAmmo.x = AMMO_PADDING_X + Math.random() * AMMO_SPAWN_WIDTH;
				newAmmo.y = AMMO_PADDING_Y + Math.random() * AMMO_SPAWN_HEIGHT;
				validPosition = true;
				for (var i = 0; i < ammos.length; i++) {
					var dx = newAmmo.x - ammos[i].x;
					var dy = newAmmo.y - ammos[i].y;
					var distance = Math.sqrt(dx * dx + dy * dy);
					if (distance < 400) {
						validPosition = false;
						break;
					}
				}
			}
			ammos.push(newAmmo);
			midgroundContainer.addChild(newAmmo);
		}
	}
};