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

/**** 
* Classes
****/ 
// Collectible class
var Collectible = Container.expand(function () {
	var self = Container.call(this);
	var colSprite = self.attachAsset('collectible', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 10; // Will be set dynamically
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
// Obstacle class
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	var obsSprite = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 12; // Will be set dynamically
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
// Player class
var Player = Container.expand(function () {
	var self = Container.call(this);
	var playerSprite = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// For collision, use the container itself
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x181818
});

/**** 
* Game Code
****/ 
// Collectible: gold ellipse
// Obstacle: red ellipse
// Player character: blue box
// Game area: 2048x2732
// Player start position: bottom center
var player = new Player();
player.x = 2048 / 2;
player.y = 2732 - 220;
game.addChild(player);
// Score display
var scoreTxt = new Text2('0', {
	size: 120,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Arrays for obstacles and collectibles
var obstacles = [];
var collectibles = [];
// Difficulty variables
var obstacleInterval = 60; // ticks between obstacles
var collectibleInterval = 180; // ticks between collectibles
var minObstacleInterval = 20;
var minCollectibleInterval = 80;
var obstacleSpeed = 12;
var collectibleSpeed = 10;
var maxObstacleSpeed = 32;
var maxCollectibleSpeed = 24;
var ticksSinceLastObstacle = 0;
var ticksSinceLastCollectible = 0;
var difficultyTimer = 0;
// Dragging
var dragNode = null;
// For collision detection
var lastPlayerHit = false;
// Move handler for dragging player
function handleMove(x, y, obj) {
	if (dragNode) {
		// Clamp player within game area
		var px = Math.max(player.width / 2, Math.min(2048 - player.width / 2, x));
		var py = Math.max(player.height / 2 + 100, Math.min(2732 - player.height / 2, y));
		player.x = px;
		player.y = py;
	}
}
game.move = handleMove;
game.down = function (x, y, obj) {
	// Only start drag if touch is on player
	var local = player.toLocal(game.toGlobal({
		x: x,
		y: y
	}));
	if (Math.abs(local.x) <= player.width / 2 && Math.abs(local.y) <= player.height / 2) {
		dragNode = player;
		handleMove(x, y, obj);
	}
};
game.up = function (x, y, obj) {
	dragNode = null;
};
// Main game update loop
game.update = function () {
	// Difficulty increases over time
	difficultyTimer++;
	if (difficultyTimer % 300 === 0) {
		// every 5 seconds
		if (obstacleInterval > minObstacleInterval) obstacleInterval -= 4;
		if (collectibleInterval > minCollectibleInterval) collectibleInterval -= 4;
		if (obstacleSpeed < maxObstacleSpeed) obstacleSpeed += 1.5;
		if (collectibleSpeed < maxCollectibleSpeed) collectibleSpeed += 1;
	}
	// Spawn obstacles
	ticksSinceLastObstacle++;
	if (ticksSinceLastObstacle >= obstacleInterval) {
		ticksSinceLastObstacle = 0;
		var obs = new Obstacle();
		obs.x = Math.random() * (2048 - 180) + 90;
		obs.y = -80;
		obs.speed = obstacleSpeed + Math.random() * 2;
		obstacles.push(obs);
		game.addChild(obs);
	}
	// Spawn collectibles
	ticksSinceLastCollectible++;
	if (ticksSinceLastCollectible >= collectibleInterval) {
		ticksSinceLastCollectible = 0;
		var col = new Collectible();
		col.x = Math.random() * (2048 - 140) + 70;
		col.y = -60;
		col.speed = collectibleSpeed + Math.random() * 2;
		collectibles.push(col);
		game.addChild(col);
	}
	// Update obstacles
	for (var i = obstacles.length - 1; i >= 0; i--) {
		var obs = obstacles[i];
		obs.update();
		// Remove if off screen
		if (obs.y - obs.height / 2 > 2732 + 40) {
			obs.destroy();
			obstacles.splice(i, 1);
			continue;
		}
		// Collision with player
		var hit = player.intersects(obs);
		if (!lastPlayerHit && hit) {
			// Flash screen red
			LK.effects.flashScreen(0xff0000, 800);
			// Game over
			LK.showGameOver();
			return;
		}
		lastPlayerHit = hit;
	}
	// Update collectibles
	for (var j = collectibles.length - 1; j >= 0; j--) {
		var col = collectibles[j];
		col.update();
		// Remove if off screen
		if (col.y - col.height / 2 > 2732 + 40) {
			col.destroy();
			collectibles.splice(j, 1);
			continue;
		}
		// Collision with player
		if (player.intersects(col)) {
			// Add score
			LK.setScore(LK.getScore() + 5);
			scoreTxt.setText(LK.getScore());
			// Flash collectible
			LK.effects.flashObject(col, 0xffffff, 200);
			col.destroy();
			collectibles.splice(j, 1);
			continue;
		}
	}
	// Update score display
	scoreTxt.setText(LK.getScore());
};
// Reset score on game start
LK.setScore(0);
scoreTxt.setText('0');