/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");

/**** 
* Classes
****/ 
// Enemy class
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemySprite = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = enemySprite.width;
	self.height = enemySprite.height;
	self.speed = 6 + Math.random() * 3;
	self.shootTimer = 60 + Math.floor(Math.random() * 60);
	self.hp = 1;
	// Update
	self.update = function () {
		self.y += self.speed;
		self.shootTimer--;
		if (self.shootTimer <= 0) {
			self.shoot();
			self.shootTimer = 90 + Math.floor(Math.random() * 60);
		}
	};
	// Shoot
	self.shoot = function () {
		var bullet = new EnemyBullet();
		bullet.x = self.x;
		bullet.y = self.y + self.height / 2 + bullet.height / 2;
		enemyBullets.push(bullet);
		game.addChild(bullet);
	};
	return self;
});
// Enemy bullet class
var EnemyBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletSprite = self.attachAsset('enemyBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = bulletSprite.width;
	self.height = bulletSprite.height;
	self.speed = 18;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
// Hero class
var Hero = Container.expand(function () {
	var self = Container.call(this);
	var heroSprite = self.attachAsset('hero', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = heroSprite.width;
	self.height = heroSprite.height;
	self.shootCooldown = 0;
	self.poweredUp = false;
	self.powerupTimer = 0;
	// Shoot method
	self.shoot = function () {
		if (self.shootCooldown > 0) return;
		var bullet = new HeroBullet();
		bullet.x = self.x;
		bullet.y = self.y - self.height / 2 - bullet.height / 2;
		heroBullets.push(bullet);
		game.addChild(bullet);
		LK.getSound('shoot').play();
		self.shootCooldown = self.poweredUp ? 10 : 20; // Faster shooting if powered up
	};
	// Powerup method
	self.activatePowerup = function () {
		self.poweredUp = true;
		self.powerupTimer = 300; // 5 seconds at 60fps
		tween(self, {
			scaleX: 1.3,
			scaleY: 1.3
		}, {
			duration: 200,
			easing: tween.elasticOut
		});
	};
	// Remove powerup
	self.deactivatePowerup = function () {
		self.poweredUp = false;
		tween(self, {
			scaleX: 1,
			scaleY: 1
		}, {
			duration: 200,
			easing: tween.elasticIn
		});
	};
	// Update
	self.update = function () {
		if (self.shootCooldown > 0) self.shootCooldown--;
		if (self.poweredUp) {
			self.powerupTimer--;
			if (self.powerupTimer <= 0) {
				self.deactivatePowerup();
			}
		}
	};
	return self;
});
// Hero bullet class
var HeroBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletSprite = self.attachAsset('heroBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = bulletSprite.width;
	self.height = bulletSprite.height;
	self.speed = -28;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
// Powerup class
var Powerup = Container.expand(function () {
	var self = Container.call(this);
	var powerupSprite = self.attachAsset('powerup', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = powerupSprite.width;
	self.height = powerupSprite.height;
	self.speed = 10;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x222a36
});

/**** 
* Game Code
****/ 
// Music
// Sound effects
// Powerup: green ellipse
// Hero bullet: yellow box
// Enemy bullet: orange box
// Enemy asset: red ellipse
// Hero asset: blue box
// Play music
LK.playMusic('battlefieldMusic');
// Score
var score = 0;
var scoreTxt = new Text2('0', {
	size: 120,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Hero lives
var heroLives = 5;
var livesTxt = new Text2("♥ x" + heroLives, {
	size: 110,
	fill: 0xFF4444,
	font: "Impact, Arial Black, Tahoma"
});
livesTxt.anchor.set(1, 0);
livesTxt.x = LK.gui.width - 40;
livesTxt.y = 0;
LK.gui.top.addChild(livesTxt);
// Hero instance
var hero = new Hero();
game.addChild(hero);
hero.x = 2048 / 2;
hero.y = 2732 - 350;
// Arrays for game objects
var enemies = [];
var heroBullets = [];
var enemyBullets = [];
var powerups = [];
// Dragging
var dragNode = null;
// Difficulty
var spawnTimer = 0;
var spawnInterval = 60;
var difficultyTimer = 0;
// Powerup spawn
var powerupTimer = 600;
// Move handler
function handleMove(x, y, obj) {
	if (dragNode) {
		// Clamp hero inside game area, avoid top 100px and bottom 100px
		var minX = hero.width / 2;
		var maxX = 2048 - hero.width / 2;
		var minY = 100 + hero.height / 2;
		var maxY = 2732 - hero.height / 2 - 100;
		hero.x = Math.max(minX, Math.min(maxX, x));
		hero.y = Math.max(minY, Math.min(maxY, y));
	}
}
game.move = handleMove;
game.down = function (x, y, obj) {
	// Only start drag if touch is on hero
	var dx = x - hero.x;
	var dy = y - hero.y;
	if (dx * dx + dy * dy < hero.width / 2 * (hero.width / 2)) {
		dragNode = hero;
		handleMove(x, y, obj);
	}
};
game.up = function (x, y, obj) {
	dragNode = null;
};
// Main update loop
game.update = function () {
	// Hero update
	hero.update();
	// Hero auto-shoot
	if (LK.ticks % (hero.poweredUp ? 6 : 12) === 0) {
		hero.shoot();
	}
	// Spawn enemies
	spawnTimer--;
	if (spawnTimer <= 0) {
		var enemy = new Enemy();
		var margin = 120;
		enemy.x = margin + Math.random() * (2048 - 2 * margin);
		enemy.y = -enemy.height / 2;
		enemies.push(enemy);
		game.addChild(enemy);
		spawnTimer = spawnInterval;
	}
	// Increase difficulty over time
	difficultyTimer++;
	if (difficultyTimer % 600 === 0 && spawnInterval > 20) {
		spawnInterval -= 5;
	}
	// Powerup spawn
	powerupTimer--;
	if (powerupTimer <= 0) {
		var powerup = new Powerup();
		powerup.x = 200 + Math.random() * (2048 - 400);
		powerup.y = -powerup.height / 2;
		powerups.push(powerup);
		game.addChild(powerup);
		powerupTimer = 900 + Math.floor(Math.random() * 600);
	}
	// Update and cleanup hero bullets
	for (var i = heroBullets.length - 1; i >= 0; i--) {
		var b = heroBullets[i];
		b.update();
		if (b.y < -b.height / 2) {
			b.destroy();
			heroBullets.splice(i, 1);
			continue;
		}
		// Collision with enemies
		for (var j = enemies.length - 1; j >= 0; j--) {
			var e = enemies[j];
			if (b.intersects(e)) {
				e.hp--;
				if (e.hp <= 0) {
					LK.getSound('enemyDown').play();
					score += 10;
					scoreTxt.setText(score);
					e.destroy();
					enemies.splice(j, 1);
				}
				b.destroy();
				heroBullets.splice(i, 1);
				break;
			}
		}
	}
	// Update and cleanup enemy bullets
	for (var i = enemyBullets.length - 1; i >= 0; i--) {
		var eb = enemyBullets[i];
		eb.update();
		if (eb.y > 2732 + eb.height / 2) {
			eb.destroy();
			enemyBullets.splice(i, 1);
			continue;
		}
		// Collision with hero
		if (eb.intersects(hero)) {
			LK.effects.flashScreen(0xff0000, 800);
			heroLives--;
			livesTxt.setText("♥ x" + heroLives);
			eb.destroy();
			enemyBullets.splice(i, 1);
			if (heroLives <= 0) {
				LK.showGameOver();
				return;
			}
			continue;
		}
	}
	// Update and cleanup enemies
	for (var i = enemies.length - 1; i >= 0; i--) {
		var e = enemies[i];
		e.update();
		if (e.y > 2732 + e.height / 2) {
			e.destroy();
			enemies.splice(i, 1);
			continue;
		}
		// Collision with hero
		if (e.intersects(hero)) {
			LK.effects.flashScreen(0xff0000, 800);
			heroLives--;
			livesTxt.setText("♥ x" + heroLives);
			e.destroy();
			enemies.splice(i, 1);
			if (heroLives <= 0) {
				LK.showGameOver();
				return;
			}
			continue;
		}
	}
	// Update and cleanup powerups
	for (var i = powerups.length - 1; i >= 0; i--) {
		var p = powerups[i];
		p.update();
		if (p.y > 2732 + p.height / 2) {
			p.destroy();
			powerups.splice(i, 1);
			continue;
		}
		// Collision with hero
		if (p.intersects(hero)) {
			LK.getSound('powerup').play();
			hero.activatePowerup();
			p.destroy();
			powerups.splice(i, 1);
			continue;
		}
	}
	// Win condition: score 500
	if (score >= 500) {
		LK.showYouWin();
		return;
	}
};