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

/**** 
* Classes
****/ 
// Bullet Class
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bullet = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Direction vector
	self.dirX = 0;
	self.dirY = -1;
	// Speed
	self.speed = 38;
	// For collision
	self.radius = 30;
	// Update
	self.update = function () {
		self.x += self.dirX * self.speed;
		self.y += self.dirY * self.speed;
	};
	// Set direction
	self.setDirection = function (dx, dy) {
		var len = Math.sqrt(dx * dx + dy * dy);
		if (len > 0.01) {
			self.dirX = dx / len;
			self.dirY = dy / len;
		}
	};
	return self;
});
// Enemy Car Class
var EnemyCar = Container.expand(function () {
	var self = Container.call(this);
	var car = self.attachAsset('enemyCar', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Target position (player car)
	self.targetX = 2048 / 2;
	self.targetY = 2732 / 2;
	// Speed (pixels per tick)
	self.speed = 7;
	// Direction vector
	self.dirX = 0;
	self.dirY = 1;
	// For collision
	self.radius = 90;
	// Update method
	self.update = function () {
		// Move toward target (player car)
		var dx = self.targetX - self.x;
		var dy = self.targetY - self.y;
		var len = Math.sqrt(dx * dx + dy * dy);
		if (len > 0.01) {
			self.dirX = dx / len;
			self.dirY = dy / len;
			// Enemy car speed is always self.speed, never boosted
			self.x += self.dirX * self.speed;
			self.y += self.dirY * self.speed;
			// Rotate car to face movement
			car.rotation = Math.atan2(self.dirY, self.dirX) + Math.PI / 2;
		}
	};
	// Set target (player car position)
	self.setTarget = function (x, y) {
		self.targetX = x;
		self.targetY = y;
	};
	return self;
});
// Player Car Class
var PlayerCar = Container.expand(function () {
	var self = Container.call(this);
	// Attach car asset, anchor center
	var car = self.attachAsset('playerCar', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// For visual orientation, add a "gun" at the top (optional)
	// Not required for MVP
	// Movement speed (pixels per tick)
	self.baseSpeed = 12;
	self.boostSpeed = 24;
	self.currentSpeed = self.baseSpeed;
	// Direction vector (normalized)
	self.dirX = 0;
	self.dirY = -1;
	// Set initial position to center
	self.x = 2048 / 2;
	self.y = 2732 / 2;
	// For auto-shoot cooldown
	self.shootCooldown = 0;
	// Update method: called every tick
	self.update = function () {
		// Move in direction of pointer
		self.x += self.dirX * self.currentSpeed;
		self.y += self.dirY * self.currentSpeed;
		// Clamp to game area (keep inside bounds)
		if (self.x < 90) self.x = 90;
		if (self.x > 2048 - 90) self.x = 2048 - 90;
		if (self.y < 160) self.y = 160;
		if (self.y > 2732 - 160) self.y = 2732 - 160;
		// Cooldown for shooting
		if (self.shootCooldown > 0) self.shootCooldown--;
	};
	// Set direction toward pointer
	self.setDirection = function (targetX, targetY) {
		var dx = targetX - self.x;
		var dy = targetY - self.y;
		var len = Math.sqrt(dx * dx + dy * dy);
		if (len > 0.01) {
			self.dirX = dx / len;
			self.dirY = dy / len;
			// Rotate car to face direction
			car.rotation = Math.atan2(self.dirY, self.dirX) + Math.PI / 2;
		}
	};
	// Boost on press
	self.setBoost = function (boosting) {
		self.currentSpeed = boosting ? self.boostSpeed : self.baseSpeed;
	};
	return self;
});
// SkillBox Class
var SkillBox = Container.expand(function () {
	var self = Container.call(this);
	// Use a yellow box for skill box
	var box = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 1.2,
		scaleY: 1.2
	});
	self.radius = 40;
	self.type = "multiShot";
	// Animate (optional): pulse
	if (typeof tween === "function" && typeof box !== "undefined" && box !== null) {
		var tw = tween(box);
		if (tw && typeof tw.to === "function") {
			tw.to({
				scaleX: 1.5,
				scaleY: 1.5
			}, 400).yoyo(true).repeat(Infinity).start();
		}
	}
	// Update: can float up a bit
	self.floatDir = 1;
	self.floatTicks = 0;
	self.update = function () {
		self.floatTicks++;
		if (self.floatTicks % 30 === 0) self.floatDir *= -1;
		self.y += self.floatDir * 0.7;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x222222
});

/**** 
* Game Code
****/ 
// --- Global variables ---
// Player car: blue box
// Enemy car: red box
// Bullet: yellow ellipse
var player = new PlayerCar();
game.addChild(player);
var enemies = [];
var bullets = [];
var skillBoxes = [];
// Skill state
var multiShotActive = false;
var multiShotTicks = 0;
var MULTISHOT_DURATION = 600; // 10 seconds at 60fps
// Score
var score = 0;
var scoreTxt = new Text2('0', {
	size: 120,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(1, 0); // right align score
// Timer text (elapsed time in seconds, right of score)
var timerTxt = new Text2('0:00', {
	size: 90,
	fill: 0xFFFFFF
});
timerTxt.anchor.set(0, 0); // left align timer
// Position score and timer with more space between them
scoreTxt.x = LK.gui.top.width / 2 - 120; // move score further left of center for more space
scoreTxt.y = 0;
timerTxt.x = LK.gui.top.width / 2 + 120; // move timer further right of center for more space
timerTxt.y = 20;
LK.gui.top.addChild(scoreTxt);
LK.gui.top.addChild(timerTxt);
// For pointer tracking
var pointerX = 2048 / 2;
var pointerY = 2732 / 2;
// Track last pointer position and idle ticks
var lastPointerX = pointerX;
var lastPointerY = pointerY;
var pointerIdleTicks = 0;
// For boost
var boosting = false;
// For enemy spawn timer
var enemySpawnTicks = 0;
// Dynamic spawn interval variables
var ENEMY_SPAWN_INTERVAL_START = 180; // 3 seconds at 60fps
var ENEMY_SPAWN_INTERVAL_END = 60; // 1 second at 60fps
var ENEMY_SPAWN_INTERVAL = ENEMY_SPAWN_INTERVAL_START;
// Timer for game progression (in ticks)
var gameTimerTicks = 0;
var GAME_TIMER_MAX = 60 * 60; // 60 seconds to reach max difficulty
// --- Event Handlers ---
// Move: update pointer position and direction
function handleMove(x, y, obj) {
	// Clamp pointer to game area (avoid top left 100x100)
	if (x < 100) x = 100;
	if (y < 100) y = 100;
	if (x > 2048 - 100) x = 2048 - 100;
	if (y > 2732 - 100) y = 2732 - 100;
	pointerX = x;
	pointerY = y;
	player.setDirection(pointerX, pointerY);
}
game.move = handleMove;
// Down: boost on press
game.down = function (x, y, obj) {
	boosting = true;
	// Only boost the player's car, not enemy cars
	player.setBoost(true);
	handleMove(x, y, obj);
};
// Up: stop boost
game.up = function (x, y, obj) {
	boosting = false;
	// Only stop boost for the player's car, not enemy cars
	player.setBoost(false);
};
// --- Main Game Loop ---
game.update = function () {
	// Update pointer idle ticks
	if (pointerX === lastPointerX && pointerY === lastPointerY) {
		pointerIdleTicks++;
	} else {
		pointerIdleTicks = 0;
		lastPointerX = pointerX;
		lastPointerY = pointerY;
	}
	// If pointer hasn't moved for 6 frames (~0.1s), stop player car
	if (pointerIdleTicks > 5) {
		player.dirX = 0;
		player.dirY = 0;
	}
	// Update player
	player.update();
	// --- Timer and Dynamic Enemy Spawning ---
	gameTimerTicks++;
	// Update timer text (show mm:ss)
	var elapsedSec = Math.floor(gameTimerTicks / 60);
	var min = Math.floor(elapsedSec / 60);
	var sec = elapsedSec % 60;
	timerTxt.setText(min + ':' + (sec < 10 ? '0' : '') + sec);
	// Calculate progression (0 to 1)
	var progress = Math.min(gameTimerTicks / GAME_TIMER_MAX, 1);
	// Linearly interpolate spawn interval from start to end
	ENEMY_SPAWN_INTERVAL = Math.round(ENEMY_SPAWN_INTERVAL_START + (ENEMY_SPAWN_INTERVAL_END - ENEMY_SPAWN_INTERVAL_START) * progress);
	enemySpawnTicks++;
	// Determine how many enemies to spawn this cycle (1 + extra for every 10 kills)
	var spawnCount = 1 + Math.floor(score / 10);
	if (enemySpawnTicks >= ENEMY_SPAWN_INTERVAL) {
		enemySpawnTicks = 0;
		for (var spawnIdx = 0; spawnIdx < spawnCount; spawnIdx++) {
			// Spawn enemy at random edge
			var edge = Math.floor(Math.random() * 4); // 0:top, 1:right, 2:bottom, 3:left
			var ex, ey;
			if (edge === 0) {
				// top
				ex = 200 + Math.random() * (2048 - 400);
				ey = -160;
			} else if (edge === 1) {
				// right
				ex = 2048 + 160;
				ey = 200 + Math.random() * (2732 - 400);
			} else if (edge === 2) {
				// bottom
				ex = 200 + Math.random() * (2048 - 400);
				ey = 2732 + 160;
			} else {
				// left
				ex = -160;
				ey = 200 + Math.random() * (2732 - 400);
			}
			var enemy = new EnemyCar();
			enemy.x = ex;
			enemy.y = ey;
			enemy.setTarget(player.x, player.y);
			enemies.push(enemy);
			game.addChild(enemy);
		}
	}
	// --- Update Enemies ---
	for (var i = enemies.length - 1; i >= 0; i--) {
		var enemy = enemies[i];
		enemy.setTarget(player.x, player.y);
		enemy.update();
		// Check collision with player (circle collision)
		var dx = enemy.x - player.x;
		var dy = enemy.y - player.y;
		var dist = Math.sqrt(dx * dx + dy * dy);
		if (dist < 160) {
			// Game over
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
			return;
		}
	}
	// --- Auto-shoot at nearest enemy ---
	// Only if there are enemies and cooldown is 0
	if (enemies.length > 0 && player.shootCooldown === 0) {
		// Find nearest enemy
		var minDist = 999999;
		var nearest = null;
		for (var i = 0; i < enemies.length; i++) {
			var dx = enemies[i].x - player.x;
			var dy = enemies[i].y - player.y;
			var d = dx * dx + dy * dy;
			if (d < minDist) {
				minDist = d;
				nearest = enemies[i];
			}
		}
		if (nearest) {
			// Multi-shot: fire 3 bullets in a spread if skill is active
			var numBullets = multiShotActive ? 3 : 1;
			var spread = multiShotActive ? Math.PI / 8 : 0; // 22.5 deg spread
			var carDir = Math.atan2(player.dirY, player.dirX);
			for (var b = 0; b < numBullets; b++) {
				var bullet = new Bullet();
				// Place bullet at top of car (offset in direction of car)
				var offsetX = Math.cos(carDir) * 180;
				var offsetY = Math.sin(carDir) * 180;
				bullet.x = player.x + offsetX;
				bullet.y = player.y + offsetY;
				// Direction: from bullet to enemy, with spread
				var angle = Math.atan2(nearest.y - bullet.y, nearest.x - bullet.x);
				if (numBullets > 1) {
					angle += spread * (b - (numBullets - 1) / 2);
				}
				var bdx = Math.cos(angle);
				var bdy = Math.sin(angle);
				bullet.setDirection(bdx, bdy);
				bullets.push(bullet);
				game.addChild(bullet);
			}
			player.shootCooldown = 30; // 0.5s cooldown
		}
	}
	// --- Update Skill Boxes ---
	for (var s = skillBoxes.length - 1; s >= 0; s--) {
		var box = skillBoxes[s];
		box.update && box.update();
		// Collect if player overlaps
		var dx = box.x - player.x;
		var dy = box.y - player.y;
		var dist = Math.sqrt(dx * dx + dy * dy);
		if (dist < 120) {
			// Activate multi-shot
			multiShotActive = true;
			multiShotTicks = MULTISHOT_DURATION;
			box.destroy();
			skillBoxes.splice(s, 1);
			continue;
		}
		// Remove if out of bounds
		if (box.x < -200 || box.x > 2048 + 200 || box.y < -200 || box.y > 2732 + 200) {
			box.destroy();
			skillBoxes.splice(s, 1);
			continue;
		}
	}
	// --- Update Bullets ---
	for (var i = bullets.length - 1; i >= 0; i--) {
		var bullet = bullets[i];
		bullet.update();
		// Remove if out of bounds
		if (bullet.x < -100 || bullet.x > 2048 + 100 || bullet.y < -100 || bullet.y > 2732 + 100) {
			bullet.destroy();
			bullets.splice(i, 1);
			continue;
		}
		// Check collision with enemies
		var hit = false;
		for (var j = enemies.length - 1; j >= 0; j--) {
			var enemy = enemies[j];
			var dx = bullet.x - enemy.x;
			var dy = bullet.y - enemy.y;
			var dist = Math.sqrt(dx * dx + dy * dy);
			if (dist < 100) {
				// Hit!
				hit = true;
				// Remove enemy
				// --- Skill box spawn logic ---
				var spawnSkill = false;
				if (score >= 10 && Math.random() < 0.5) {
					// 50% chance after 10 kills
					spawnSkill = true;
				}
				var skillBoxSpawned = false;
				if (spawnSkill) {
					var skillBox = new SkillBox();
					skillBox.x = enemy.x;
					skillBox.y = enemy.y;
					skillBoxes.push(skillBox);
					game.addChild(skillBox);
					skillBoxSpawned = true;
				}
				// Remove enemy
				enemy.destroy();
				enemies.splice(j, 1);
				// Remove bullet
				bullet.destroy();
				bullets.splice(i, 1);
				// Score
				score++;
				scoreTxt.setText(score);
				break;
			}
		}
		if (hit) continue;
	}
	// --- Camera: keep player centered ---
	// (In LK, the game area is fixed, so we simulate by keeping player in center and moving everything else if needed)
	// For MVP, player always stays in center, so no need to move camera.
	// --- Decrement player shoot cooldown ---
	if (player.shootCooldown > 0) player.shootCooldown--;
	// --- Decrement multi-shot skill duration ---
	if (multiShotActive) {
		multiShotTicks--;
		if (multiShotTicks <= 0) {
			multiShotActive = false;
		}
	}
};
// --- Initial pointer direction ---
player.setDirection(pointerX, pointerY);