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

/**** 
* Classes
****/ 
// Enemy Cannonball Class
var Cannonball = Container.expand(function () {
	var self = Container.call(this);
	var ball = self.attachAsset('cannonball', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = ball.width;
	self.height = ball.height;
	self.speed = 10;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
// Enemy Ship Class
var EnemyShip = Container.expand(function () {
	var self = Container.call(this);
	var ship = self.attachAsset('enemyShip', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = ship.width;
	self.height = ship.height;
	self.speed = 2 + Math.random() * 2; // Vary speed
	self.fireCooldown = 60 + Math.floor(Math.random() * 60); // Ticks until next shot
	self.dir = Math.random() < 0.5 ? -1 : 1; // -1: left, 1: right
	self.horizSpeed = 3 + Math.random() * 2;
	self.lastX = self.x;
	self.update = function () {
		// Horizontal movement
		self.lastX = self.x;
		self.x += self.horizSpeed * self.dir;
		// Bounce at screen edges
		var halfW = self.width / 2;
		if (self.x - halfW <= 0 && self.dir < 0 || self.x + halfW >= 2048 && self.dir > 0) {
			self.dir *= -1;
			self.x = clamp(self.x, halfW, 2048 - halfW);
		}
		self.y += self.speed;
		self.fireCooldown--;
	};
	return self;
});
// Explosion effect (visual only)
var Explosion = Container.expand(function () {
	var self = Container.call(this);
	var exp = self.attachAsset('explosion', {
		anchorX: 0.5,
		anchorY: 0.5,
		alpha: 0.8
	});
	// Animate: scale up and fade out
	tween(self, {
		scaleX: 1.8,
		scaleY: 1.8,
		alpha: 0
	}, {
		duration: 350,
		easing: tween.easeOut,
		onFinish: function onFinish() {
			self.destroy();
		}
	});
	return self;
});
// Player Cannonball Class
var PlayerCannonball = Container.expand(function () {
	var self = Container.call(this);
	var ball = self.attachAsset('playerCannonball', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = ball.width;
	self.height = ball.height;
	self.speed = -16;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
// Player Ship Class
var PlayerShip = Container.expand(function () {
	var self = Container.call(this);
	var ship = self.attachAsset('playerShip', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = ship.width;
	self.height = ship.height;
	// For hit flash
	self.flash = function () {
		tween(self, {
			alpha: 0.3
		}, {
			duration: 100,
			onFinish: function onFinish() {
				tween(self, {
					alpha: 1
				}, {
					duration: 200
				});
			}
		});
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x1a3a5c // Deep blue sea
});

/**** 
* Game Code
****/ 
// Explosion: red ellipse, 80x80
// Player cannonball: gold ellipse, 60x60
// Cannonball: black ellipse, 60x60
// Enemy ship: dark gray box, 160x100
// Player ship: brown box, 180x120
// --- Globals ---
var playerShip;
var enemyShips = [];
var cannonballs = [];
var playerCannonballs = [];
var explosions = [];
var dragNode = null;
var lastPlayerHit = false;
var scoreTxt;
var spawnTimer = 0;
var enemySpawnInterval = 120; // ticks
var minEnemySpawnInterval = 40;
var difficultyTimer = 0;
// --- Setup background color ---
game.setBackgroundColor(0x1a3a5c);
// --- Score UI ---
scoreTxt = new Text2('0', {
	size: 120,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// --- Player Ship ---
playerShip = new PlayerShip();
playerShip.x = 2048 / 2;
playerShip.y = 2732 - 220;
game.addChild(playerShip);
// --- Touch Controls ---
function clamp(val, min, max) {
	if (val < min) return min;
	if (val > max) return max;
	return val;
}
function handleMove(x, y, obj) {
	if (dragNode === playerShip) {
		// Clamp ship inside screen
		var halfW = playerShip.width / 2;
		var halfH = playerShip.height / 2;
		playerShip.x = clamp(x, halfW, 2048 - halfW);
		playerShip.y = clamp(y, 2732 * 0.5, 2732 - halfH - 20);
	}
}
game.move = handleMove;
game.down = function (x, y, obj) {
	// Only start drag if touch is on player ship
	var local = playerShip.toLocal(game.toGlobal({
		x: x,
		y: y
	}));
	if (local.x >= -playerShip.width / 2 && local.x <= playerShip.width / 2 && local.y >= -playerShip.height / 2 && local.y <= playerShip.height / 2) {
		dragNode = playerShip;
		handleMove(x, y, obj);
	}
};
game.up = function (x, y, obj) {
	dragNode = null;
};
// --- Game Update Loop ---
game.update = function () {
	// --- Difficulty scaling ---
	difficultyTimer++;
	if (difficultyTimer % 600 === 0 && enemySpawnInterval > minEnemySpawnInterval) {
		enemySpawnInterval -= 10;
		if (enemySpawnInterval < minEnemySpawnInterval) enemySpawnInterval = minEnemySpawnInterval;
	}
	// --- Spawn Enemies ---
	spawnTimer++;
	if (spawnTimer >= enemySpawnInterval) {
		spawnTimer = 0;
		var enemy = new EnemyShip();
		// Random x, avoid edges
		var ew = enemy.width / 2;
		enemy.x = ew + Math.random() * (2048 - ew * 2);
		enemy.y = -enemy.height / 2 - 10;
		enemyShips.push(enemy);
		game.addChild(enemy);
	}
	// --- Update Enemies ---
	for (var i = enemyShips.length - 1; i >= 0; i--) {
		var enemy = enemyShips[i];
		enemy.update();
		// Fire cannonball if ready and player is alive
		if (enemy.fireCooldown <= 0 && playerShip && !lastPlayerHit) {
			var cb = new Cannonball();
			cb.x = enemy.x;
			cb.y = enemy.y + enemy.height / 2 + 10;
			cannonballs.push(cb);
			game.addChild(cb);
			enemy.fireCooldown = 90 + Math.floor(Math.random() * 60);
		}
		// Remove if off screen
		if (enemy.y - enemy.height / 2 > 2732 + 100) {
			enemy.destroy();
			enemyShips.splice(i, 1);
		}
	}
	// --- Update Enemy Cannonballs ---
	for (var i = cannonballs.length - 1; i >= 0; i--) {
		var cb = cannonballs[i];
		cb.update();
		// Collision with player
		if (playerShip && cb.intersects(playerShip)) {
			// Hit!
			if (!lastPlayerHit) {
				playerShip.flash();
				LK.effects.flashScreen(0xff0000, 800);
				lastPlayerHit = true;
				// Show game over after short delay for effect
				LK.setTimeout(function () {
					LK.showGameOver();
				}, 600);
			}
		}
		// Remove if off screen
		if (cb.y - cb.height / 2 > 2732 + 60) {
			cb.destroy();
			cannonballs.splice(i, 1);
		}
	}
	// --- Update Player Cannonballs ---
	for (var i = playerCannonballs.length - 1; i >= 0; i--) {
		var pcb = playerCannonballs[i];
		pcb.update();
		// Remove if off screen
		if (pcb.y + pcb.height / 2 < -60) {
			pcb.destroy();
			playerCannonballs.splice(i, 1);
			continue;
		}
		// Check collision with enemy ships
		for (var j = enemyShips.length - 1; j >= 0; j--) {
			var enemy = enemyShips[j];
			if (pcb.intersects(enemy)) {
				// Explosion effect
				var exp = new Explosion();
				exp.x = enemy.x;
				exp.y = enemy.y;
				game.addChild(exp);
				// Remove enemy and cannonball
				enemy.destroy();
				enemyShips.splice(j, 1);
				pcb.destroy();
				playerCannonballs.splice(i, 1);
				// Score
				LK.setScore(LK.getScore() + 1);
				scoreTxt.setText(LK.getScore());
				break;
			}
		}
	}
	// --- Fire player cannonball (auto-fire every 18 ticks) ---
	if (playerShip && !lastPlayerHit && LK.ticks % 18 === 0) {
		var pcb = new PlayerCannonball();
		pcb.x = playerShip.x;
		pcb.y = playerShip.y - playerShip.height / 2 - 10;
		playerCannonballs.push(pcb);
		game.addChild(pcb);
	}
};