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

/**** 
* Classes
****/ 
// Player character controlled by face
var FaceChar = Container.expand(function () {
	var self = Container.call(this);
	var _char = self.attachAsset('faceChar', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// For hit flash
	self.flash = function () {
		tween(self, {
			alpha: 0.3
		}, {
			duration: 80,
			onFinish: function onFinish() {
				tween(self, {
					alpha: 1
				}, {
					duration: 120
				});
			}
		});
	};
	return self;
});
// Obstacle class
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	var obs = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// For possible future animation
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
// Point collectible class
var PointItem = Container.expand(function () {
	var self = Container.call(this);
	var pt = self.attachAsset('point', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x181c2c
});

/**** 
* Game Code
****/ 
/*
We use simple shapes for the character, obstacles, and points.
- character: ellipse, bright color
- obstacle: box, dark color
- point: ellipse, gold color
*/
// Game constants
var GAME_WIDTH = 2048;
var GAME_HEIGHT = 2732;
var CHAR_START_X = GAME_WIDTH / 2;
var CHAR_START_Y = GAME_HEIGHT * 0.8;
var OBSTACLE_MIN_X = 180;
var OBSTACLE_MAX_X = GAME_WIDTH - 180;
var OBSTACLE_MIN_GAP = 400;
var OBSTACLE_MAX_GAP = 900;
var OBSTACLE_MIN_SPEED = 12;
var OBSTACLE_MAX_SPEED = 32;
var POINT_MIN_GAP = 600;
var POINT_MAX_GAP = 1400;
var POINT_SPEED_FACTOR = 1.0;
// Game state
var faceChar;
var obstacles = [];
var points = [];
var score = 0;
var scoreTxt;
var lastObstacleY = 0;
var lastPointY = 0;
var gameSpeed = 1.0;
var ticksSinceStart = 0;
var isGameOver = false;
// Score display
scoreTxt = new Text2('0', {
	size: 140,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Create player character
faceChar = new FaceChar();
game.addChild(faceChar);
faceChar.x = CHAR_START_X;
faceChar.y = CHAR_START_Y;
// Helper: Clamp value
function clamp(val, min, max) {
	return Math.max(min, Math.min(max, val));
}
// Helper: Generate random integer in [min, max]
function randInt(min, max) {
	return min + Math.floor(Math.random() * (max - min + 1));
}
// Helper: Place new obstacle at top
function spawnObstacle() {
	var obs = new Obstacle();
	obs.x = randInt(OBSTACLE_MIN_X, OBSTACLE_MAX_X);
	obs.y = -100;
	obs.speed = OBSTACLE_MIN_SPEED + (OBSTACLE_MAX_SPEED - OBSTACLE_MIN_SPEED) * Math.min(1, gameSpeed / 3);
	obstacles.push(obs);
	game.addChild(obs);
}
// Helper: Place new point at top
function spawnPoint() {
	var pt = new PointItem();
	pt.x = randInt(OBSTACLE_MIN_X, OBSTACLE_MAX_X);
	pt.y = -80;
	pt.speed = (OBSTACLE_MIN_SPEED + (OBSTACLE_MAX_SPEED - OBSTACLE_MIN_SPEED) * Math.min(1, gameSpeed / 3)) * POINT_SPEED_FACTOR;
	points.push(pt);
	game.addChild(pt);
}
// Main update loop
game.update = function () {
	if (isGameOver) return;
	ticksSinceStart++;
	// Increase speed over time
	if (ticksSinceStart % 120 === 0) {
		gameSpeed += 0.08;
	}
	// Face tracking: Use mouth center if available, else nose tip
	var fx = facekit.mouthCenter && facekit.mouthCenter.x ? facekit.mouthCenter.x : facekit.noseTip && facekit.noseTip.x ? facekit.noseTip.x : CHAR_START_X;
	var fy = facekit.mouthCenter && facekit.mouthCenter.y ? facekit.mouthCenter.y : facekit.noseTip && facekit.noseTip.y ? facekit.noseTip.y : CHAR_START_Y;
	// Clamp to game area, avoid top 100px (menu)
	faceChar.x = clamp(fx, 100 + faceChar.width / 2, GAME_WIDTH - faceChar.width / 2);
	faceChar.y = clamp(fy, 200 + faceChar.height / 2, GAME_HEIGHT - faceChar.height / 2);
	// Spawn obstacles
	if (obstacles.length === 0 || obstacles[obstacles.length - 1].y > randInt(OBSTACLE_MIN_GAP, OBSTACLE_MAX_GAP)) {
		spawnObstacle();
	}
	// Spawn points
	if (points.length === 0 || points[points.length - 1].y > randInt(POINT_MIN_GAP, POINT_MAX_GAP)) {
		spawnPoint();
	}
	// Update obstacles
	for (var i = obstacles.length - 1; i >= 0; i--) {
		var obs = obstacles[i];
		obs.y += obs.speed * gameSpeed;
		if (obs.y > GAME_HEIGHT + 100) {
			obs.destroy();
			obstacles.splice(i, 1);
			continue;
		}
		// Collision with player
		if (faceChar.intersects(obs)) {
			isGameOver = true;
			faceChar.flash();
			LK.effects.flashScreen(0xff2222, 800);
			LK.showGameOver();
			return;
		}
	}
	// Update points
	for (var j = points.length - 1; j >= 0; j--) {
		var pt = points[j];
		pt.y += pt.speed * gameSpeed;
		if (pt.y > GAME_HEIGHT + 80) {
			pt.destroy();
			points.splice(j, 1);
			continue;
		}
		// Collect point
		if (faceChar.intersects(pt)) {
			score += 1;
			scoreTxt.setText(score);
			// Flash effect
			LK.effects.flashObject(faceChar, 0xffd700, 200);
			pt.destroy();
			points.splice(j, 1);
			continue;
		}
	}
};
// Reset state on game restart
game.on('reset', function () {
	// Remove all obstacles and points
	for (var i = 0; i < obstacles.length; i++) {
		obstacles[i].destroy();
	}
	for (var j = 0; j < points.length; j++) {
		points[j].destroy();
	}
	obstacles = [];
	points = [];
	score = 0;
	scoreTxt.setText(score);
	faceChar.x = CHAR_START_X;
	faceChar.y = CHAR_START_Y;
	gameSpeed = 1.0;
	ticksSinceStart = 0;
	isGameOver = false;
});