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

/**** 
* Classes
****/ 
// Bird class
var Bird = Container.expand(function () {
	var self = Container.call(this);
	// Attach a red ellipse as the bird
	var birdAsset = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Attach a yellow triangle as the bird's nose (beak)
	var beak = self.attachAsset('beakTriangle', {
		anchorX: 0.1,
		// anchor at left base of triangle
		anchorY: 0.5
	});
	// Make the beak look like a triangle by scaling and rotating
	beak.width = birdAsset.width * 0.48;
	beak.height = birdAsset.height * 0.36;
	beak.x = birdAsset.width * 0.56;
	beak.y = 0;
	beak.rotation = Math.PI / 8; // slight angle for style
	beak.mask = undefined; // no mask, but visually it's a triangle by size/position
	// Physics properties
	self.vx = 0;
	self.vy = 0;
	self.launched = false;
	self.radius = birdAsset.width / 2;
	self.gravity = 0.35;
	self.friction = 0.998;
	self.bounce = 0.5;
	self.stopped = false;
	// Called every tick
	self.update = function () {
		// Track lastX and lastY for physics events
		if (typeof self.lastX === "undefined") self.lastX = self.x;
		if (typeof self.lastY === "undefined") self.lastY = self.y;
		if (self.launched && !self.stopped) {
			// Standard projectile physics, no tracking or homing
			self.vy += self.gravity;
			self.x += self.vx;
			self.y += self.vy;
			// Friction
			self.vx *= self.friction;
			self.vy *= self.friction;
			// Floor collision
			if (self.y + self.radius > groundY) {
				self.y = groundY - self.radius;
				if (Math.abs(self.vy) > 2) {
					self.vy = -self.vy * self.bounce;
					self.vx *= 0.8;
					self.stopped = false; // Don't stop if still bouncing
				} else {
					self.vy = 0;
					self.vx *= 0.8;
					// Only stop if both vx and vy are very small and bird is on ground
					if (Math.abs(self.vx) < 1 && Math.abs(self.vy) < 0.5) {
						self.stopped = true;
					} else {
						self.stopped = false;
					}
				}
			}
			// Wall collision
			if (self.x - self.radius < 0) {
				self.x = self.radius;
				self.vx = -self.vx * self.bounce;
			}
			if (self.x + self.radius > 2048) {
				self.x = 2048 - self.radius;
				self.vx = -self.vx * self.bounce;
			}
		}
		// Update lastX and lastY after movement
		self.lastX = self.x;
		self.lastY = self.y;
	};
	// Simple circle collision
	self.intersectsCircle = function (other) {
		var dx = self.x - other.x;
		var dy = self.y - other.y;
		var dist = Math.sqrt(dx * dx + dy * dy);
		return dist < self.radius + other.radius;
	};
	return self;
});
// Block class (rectangular, can be horizontal or vertical)
var Block = Container.expand(function () {
	var self = Container.call(this);
	// Attach a brown box as the block
	var blockAsset = self.attachAsset('block', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = blockAsset.width;
	self.height = blockAsset.height;
	self.vx = 0;
	self.vy = 0;
	self.gravity = 0.7;
	self.friction = 0.98;
	self.bounce = 0.3;
	self.stopped = false;
	// Add health property for wood blocks
	self.health = 100;
	// Called every tick
	self.update = function () {
		// Track lastX and lastY for physics events
		if (typeof self.lastX === "undefined") self.lastX = self.x;
		if (typeof self.lastY === "undefined") self.lastY = self.y;
		if (!self.stopped) {
			// Apply gravity to wood blocks
			self.vy += self.gravity;
			self.x += self.vx;
			self.y += self.vy;
			self.vx *= self.friction;
			self.vy *= self.friction;
			// --- Ragdoll effect: angular physics ---
			if (typeof self.angularVelocity === "undefined") self.angularVelocity = 0;
			if (typeof self.angle === "undefined") self.angle = self.rotation || 0;
			// Apply angular velocity to rotation
			self.angle += self.angularVelocity;
			self.rotation = self.angle;
			// Dampen angular velocity (simulate friction)
			self.angularVelocity *= 0.97;
			// Block-on-block collision (stand or crash)
			for (var i = 0; i < blocks.length; i++) {
				var other = blocks[i];
				if (other === self) continue;
				// Axis-aligned bounding box collision
				var selfLeft = self.x - self.width / 2;
				var selfRight = self.x + self.width / 2;
				var selfBottom = self.y + self.height / 2;
				var selfTop = self.y - self.height / 2;
				var otherLeft = other.x - other.width / 2;
				var otherRight = other.x + other.width / 2;
				var otherTop = other.y - other.height / 2;
				var otherBottom = other.y + other.height / 2;
				// Check if horizontally overlapping and self is falling onto other
				if (selfRight > otherLeft && selfLeft < otherRight && selfBottom > otherTop && selfTop < otherTop && self.vy > 0 && self.y < other.y) {
					// Land on top of the other block
					self.y = otherTop - self.height / 2;
					// If falling fast, bounce/crash
					if (Math.abs(self.vy) > 2) {
						self.vy = -self.vy * self.bounce;
						self.vx *= 0.8;
						// Transfer some force to the block below (crash effect)
						other.vx += self.vx * 0.2;
						other.vy += self.vy * 0.2;
						// --- Ragdoll: add angular velocity based on impact ---
						var impact = self.vx * 0.1 + self.vy * 0.1;
						if (typeof self.angularVelocity === "undefined") self.angularVelocity = 0;
						self.angularVelocity += impact * (Math.random() - 0.5) * 0.2;
						if (typeof other.angularVelocity === "undefined") other.angularVelocity = 0;
						other.angularVelocity += impact * (Math.random() - 0.5) * 0.2;
						// Reduce health for both blocks based on impact
						var damage = Math.min(30, Math.max(5, Math.floor(Math.abs(self.vy) * 2)));
						self.health -= damage;
						other.health -= Math.floor(damage / 2);
						// Destroy self if health <= 0
						if (self.health <= 0) {
							self.destroy();
							return;
						}
						// Destroy other if health <= 0
						if (other.health <= 0) {
							other.destroy();
						}
						// Bird-block collision damage is handled in game.update
					} else {
						self.vy = 0;
						self.vx *= 0.8;
						if (Math.abs(self.vx) < 1) {
							self.stopped = true;
						}
					}
				}
				// Also allow side-to-side collision (prevent overlap horizontally)
				if (selfBottom > otherTop && selfTop < otherBottom) {
					// Check if self is moving right into other's left side
					if (selfRight > otherLeft && selfLeft < otherLeft && self.vx > 0) {
						self.x = otherLeft - self.width / 2;
						self.vx = -self.vx * self.bounce;
						// Transfer some force to the other block (right hit)
						other.vx += self.vx * 0.2;
						// --- Ragdoll: add angular velocity based on side impact ---
						var impact = self.vx * 0.1;
						if (typeof self.angularVelocity === "undefined") self.angularVelocity = 0;
						self.angularVelocity += impact * 0.1;
						if (typeof other.angularVelocity === "undefined") other.angularVelocity = 0;
						other.angularVelocity -= impact * 0.1;
					}
					// Check if self is moving left into other's right side
					if (selfLeft < otherRight && selfRight > otherRight && self.vx < 0) {
						self.x = otherRight + self.width / 2;
						self.vx = -self.vx * self.bounce;
						// Transfer some force to the other block (left hit)
						other.vx += self.vx * 0.2;
						// --- Ragdoll: add angular velocity based on side impact ---
						var impact = self.vx * 0.1;
						if (typeof self.angularVelocity === "undefined") self.angularVelocity = 0;
						self.angularVelocity -= impact * 0.1;
						if (typeof other.angularVelocity === "undefined") other.angularVelocity = 0;
						other.angularVelocity += impact * 0.1;
					}
				}
			}
			// Floor collision
			if (self.y + self.height / 2 > groundY) {
				self.y = groundY - self.height / 2;
				if (Math.abs(self.vy) > 2) {
					self.vy = -self.vy * self.bounce;
					self.vx *= 0.8;
				} else {
					self.vy = 0;
					self.vx *= 0.8;
					if (Math.abs(self.vx) < 1) {
						self.stopped = true;
					}
				}
			}
			// Wall collision
			if (self.x - self.width / 2 < 0) {
				self.x = self.width / 2;
				self.vx = -self.vx * self.bounce;
			}
			if (self.x + self.width / 2 > 2048) {
				self.x = 2048 - self.width / 2;
				self.vx = -self.vx * self.bounce;
			}
		}
		// Update lastX and lastY after movement
		self.lastX = self.x;
		self.lastY = self.y;
	};
	// Simple rectangle collision with circle (bird)
	self.intersectsCircle = function (circle) {
		var cx = circle.x;
		var cy = circle.y;
		var rx = self.x;
		var ry = self.y;
		var hw = self.width / 2;
		var hh = self.height / 2;
		// Closest point on rectangle to circle center
		var closestX = Math.max(rx - hw, Math.min(cx, rx + hw));
		var closestY = Math.max(ry - hh, Math.min(cy, ry + hh));
		var dx = cx - closestX;
		var dy = cy - closestY;
		return dx * dx + dy * dy < circle.radius * circle.radius;
	};
	return self;
});
// Pig class
var Pig = Container.expand(function () {
	var self = Container.call(this);
	// Attach a green ellipse as the pig
	var pigAsset = self.attachAsset('pig', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = pigAsset.width / 2;
	self.alive = true;
	// Physics properties for pigs
	self.vx = 0;
	self.vy = 0;
	self.gravity = 0.7;
	self.friction = 0.98;
	self.bounce = 0.3;
	self.stopped = false;
	// Called every tick
	self.update = function () {
		if (!self.alive) return;
		// Track lastX and lastY for physics events
		if (typeof self.lastX === "undefined") self.lastX = self.x;
		if (typeof self.lastY === "undefined") self.lastY = self.y;
		if (!self.stopped) {
			self.vy += self.gravity;
			self.x += self.vx;
			self.y += self.vy;
			self.vx *= self.friction;
			self.vy *= self.friction;
			// Pig-on-block collision: prevent pig from going inside the wood blocks
			for (var i = 0; i < blocks.length; i++) {
				var block = blocks[i];
				// Axis-aligned bounding box for block
				var blockLeft = block.x - block.width / 2;
				var blockRight = block.x + block.width / 2;
				var blockTop = block.y - block.height / 2;
				var blockBottom = block.y + block.height / 2;
				// Only check if pig is above block and falling
				if (self.y < block.y && self.vy > 0) {
					// Check horizontal overlap
					if (self.x + self.radius > blockLeft && self.x - self.radius < blockRight) {
						// Check if pig's bottom is entering block's top
						if (self.y + self.radius > blockTop && self.y - self.radius < blockBottom) {
							// Place pig on top of block
							self.y = blockTop - self.radius;
							if (Math.abs(self.vy) > 2) {
								self.vy = -self.vy * self.bounce;
								self.vx *= 0.8;
								// Transfer some force to the block below (crash effect)
								block.vx += self.vx * 0.2;
								block.vy += self.vy * 0.2;
							} else {
								self.vy = 0;
								self.vx *= 0.8;
								if (Math.abs(self.vx) < 1) {
									self.stopped = true;
								}
							}
						}
					}
				}
			}
			// Floor collision
			if (self.y + self.radius > groundY) {
				self.y = groundY - self.radius;
				if (Math.abs(self.vy) > 2) {
					self.vy = -self.vy * self.bounce;
					self.vx *= 0.8;
				} else {
					self.vy = 0;
					self.vx *= 0.8;
					if (Math.abs(self.vx) < 1) {
						self.stopped = true;
					}
				}
			}
			// Wall collision
			if (self.x - self.radius < 0) {
				self.x = self.radius;
				self.vx = -self.vx * self.bounce;
			}
			if (self.x + self.radius > 2048) {
				self.x = 2048 - self.radius;
				self.vx = -self.vx * self.bounce;
			}
		}
		// Update lastX and lastY after movement
		self.lastX = self.x;
		self.lastY = self.y;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x87ceeb // Sky blue
});

/**** 
* Game Code
****/ 
// --- Asset Initialization (shapes) ---
// --- Game Variables ---
var birds = [];
var pigs = [];
var blocks = [];
var currentBird = null;
var birdIndex = 0;
var isDragging = false;
var dragStart = {
	x: 0,
	y: 0
};
var dragEnd = {
	x: 0,
	y: 0
};
var slingshotX = 180;
var slingshotY = 2000; // Raised slingshot higher (was 2450)
var slingshotBandLength = 180;
var maxBirds = 3;
var groundY = 2650;
var level = 1;
var launching = false;
var score = 0;
// --- GUI ---
var scoreTxt = new Text2('0', {
	size: 120,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
var birdsLeftTxt = new Text2('', {
	size: 80,
	fill: 0xFFFFFF
});
birdsLeftTxt.anchor.set(0.5, 0);
LK.gui.topRight.addChild(birdsLeftTxt);
// --- Draw Ground ---
var ground = LK.getAsset('ground', {
	anchorX: 0,
	anchorY: 0
});
ground.x = 0;
ground.y = groundY;
game.addChild(ground);
// --- Draw Little Mountain below the slingshot ---
var mountainWidth = 400;
var mountainHeight = 120;
var mountain = LK.getAsset('block', {
	anchorX: 0.5,
	anchorY: 1
});
mountain.width = mountainWidth;
mountain.height = mountainHeight;
mountain.x = slingshotX;
mountain.y = groundY + 10; // Slightly below ground for overlap
mountain.tint = 0x8b7765; // Optional: make it look more like a mountain
game.addChild(mountain);
// --- Draw Slingshot ---
var slingshot = LK.getAsset('slingshot', {
	anchorX: 0.5,
	anchorY: 1
});
slingshot.x = slingshotX;
slingshot.y = slingshotY + 90;
game.addChild(slingshot);
// --- Level Setup ---
function setupLevel() {
	// Clear previous
	for (var i = 0; i < birds.length; i++) birds[i].destroy();
	for (var i = 0; i < pigs.length; i++) pigs[i].destroy();
	for (var i = 0; i < blocks.length; i++) blocks[i].destroy();
	birds = [];
	pigs = [];
	blocks = [];
	birdIndex = 0;
	score = 0;
	LK.setScore(0);
	scoreTxt.setText('0');
	launching = false;
	// Place birds
	for (var i = 0; i < maxBirds; i++) {
		var bird = new Bird();
		bird.x = slingshotX - 120 - i * 80;
		bird.y = slingshotY + 40;
		birds.push(bird);
		game.addChild(bird);
	}
	currentBird = birds[birdIndex];
	// Place blocks to form a house shape
	var houseCenterX = 1500;
	var houseBottomY = groundY - 100;
	var wallW = 180;
	var wallH = 40;
	var wallHeight = 4; // number of vertical wall blocks
	var roofW = 180;
	var roofH = 40;
	// --- House base: two vertical walls (left/right), 4 blocks high ---
	for (var i = 0; i < wallHeight; i++) {
		// Left wall
		var leftWall = new Block();
		leftWall.x = houseCenterX - wallW / 2 + wallH / 2;
		leftWall.y = houseBottomY - i * wallW;
		leftWall.rotation = Math.PI / 2;
		blocks.push(leftWall);
		game.addChild(leftWall);
		// Right wall
		var rightWall = new Block();
		rightWall.x = houseCenterX + wallW / 2 - wallH / 2;
		rightWall.y = houseBottomY - i * wallW;
		rightWall.rotation = Math.PI / 2;
		blocks.push(rightWall);
		game.addChild(rightWall);
	}
	// --- House base: bottom block (floor) ---
	var houseFloor = new Block();
	houseFloor.x = houseCenterX;
	houseFloor.y = houseBottomY + wallH / 2;
	blocks.push(houseFloor);
	game.addChild(houseFloor);
	// --- House base: top block (ceiling) ---
	var houseCeiling = new Block();
	houseCeiling.x = houseCenterX;
	houseCeiling.y = houseBottomY - (wallHeight - 1) * wallW - wallH / 2;
	blocks.push(houseCeiling);
	game.addChild(houseCeiling);
	// --- House roof: two diagonal blocks (left/right) ---
	var roofLeft = new Block();
	roofLeft.x = houseCenterX - wallW / 2 + wallH / 2 + 30;
	roofLeft.y = houseCeiling.y - wallW / 2 + 10;
	roofLeft.rotation = Math.PI / 4; // 45 degrees
	blocks.push(roofLeft);
	game.addChild(roofLeft);
	var roofRight = new Block();
	roofRight.x = houseCenterX + wallW / 2 - wallH / 2 - 30;
	roofRight.y = houseCeiling.y - wallW / 2 + 10;
	roofRight.rotation = -Math.PI / 4; // -45 degrees
	blocks.push(roofRight);
	game.addChild(roofRight);
	// --- House roof: top horizontal block (roof ridge) ---
	var roofRidge = new Block();
	roofRidge.x = houseCenterX;
	roofRidge.y = houseCeiling.y - wallW / 2 - roofH / 2 + 10;
	blocks.push(roofRidge);
	game.addChild(roofRidge);
	// Place pig on the house ceiling
	var pig1 = new Pig();
	pig1.x = houseCeiling.x;
	pig1.y = houseCeiling.y - houseCeiling.height / 2 - pig1.radius - 50;
	pigs.push(pig1);
	game.addChild(pig1);
	// (Second pig inside the house removed)
	// --- Ensure blocks and pigs are not hanging in the air ---
	for (var i = 0; i < blocks.length; i++) {
		var block = blocks[i];
		// Check if block is supported by ground or another block
		var supported = false;
		// Supported by ground
		if (Math.abs(block.y + block.height / 2 - groundY) < 2) {
			supported = true;
		}
		// Supported by another block below
		for (var j = 0; j < blocks.length; j++) {
			if (i === j) continue;
			var other = blocks[j];
			var blockBottom = block.y + block.height / 2;
			var otherTop = other.y - other.height / 2;
			var horizontalOverlap = block.x + block.width / 2 > other.x - other.width / 2 && block.x - block.width / 2 < other.x + other.width / 2;
			if (horizontalOverlap && Math.abs(blockBottom - otherTop) < 2) {
				supported = true;
				break;
			}
		}
		block.stopped = !supported ? false : block.stopped;
	}
	for (var i = 0; i < pigs.length; i++) {
		var pig = pigs[i];
		// Check if pig is supported by ground or a block
		var supported = false;
		// Supported by ground
		if (Math.abs(pig.y + pig.radius - groundY) < 2) {
			supported = true;
		}
		// Supported by a block below
		for (var j = 0; j < blocks.length; j++) {
			var block = blocks[j];
			var pigBottom = pig.y + pig.radius;
			var blockTop = block.y - block.height / 2;
			var horizontalOverlap = pig.x + pig.radius > block.x - block.width / 2 && pig.x - pig.radius < block.x + block.width / 2;
			if (horizontalOverlap && Math.abs(pigBottom - blockTop) < 2) {
				supported = true;
				break;
			}
		}
		pig.stopped = !supported ? false : pig.stopped;
	}
	updateBirdsLeft();
}
// --- Update birds left text ---
function updateBirdsLeft() {
	birdsLeftTxt.setText('Birds: ' + (maxBirds - birdIndex));
}
// --- Drag and Launch Logic ---
function getDistance(x1, y1, x2, y2) {
	var dx = x2 - x1;
	var dy = y2 - y1;
	return Math.sqrt(dx * dx + dy * dy);
}
function getAngle(x1, y1, x2, y2) {
	return Math.atan2(y2 - y1, x2 - x1);
}
// Only allow drag if not launched
game.down = function (x, y, obj) {
	if (launching) return;
	if (!currentBird || currentBird.launched) return;
	// Only allow drag if touch is near the bird
	var dist = getDistance(x, y, currentBird.x, currentBird.y);
	if (dist < currentBird.radius * 1.5) {
		isDragging = true;
		dragStart.x = x;
		dragStart.y = y;
	}
};
game.move = function (x, y, obj) {
	if (isDragging && currentBird && !currentBird.launched) {
		// Limit drag distance
		var dx = x - slingshotX;
		var dy = y - slingshotY;
		var dist = getDistance(x, y, slingshotX, slingshotY);
		if (dist > slingshotBandLength) {
			var angle = getAngle(slingshotX, slingshotY, x, y);
			dx = Math.cos(angle) * slingshotBandLength;
			dy = Math.sin(angle) * slingshotBandLength;
		}
		currentBird.x = slingshotX + dx;
		currentBird.y = slingshotY + dy;
		dragEnd.x = currentBird.x;
		dragEnd.y = currentBird.y;
	}
};
game.up = function (x, y, obj) {
	if (isDragging && currentBird && !currentBird.launched) {
		isDragging = false;
		// Calculate launch velocity
		var dx = slingshotX - currentBird.x;
		var dy = slingshotY - currentBird.y;
		currentBird.vx = dx * 0.18;
		currentBird.vy = dy * 0.18;
		currentBird.launched = true;
		launching = true;
		// Animate slingshot back
		tween(currentBird, {
			x: currentBird.x,
			y: currentBird.y
		}, {
			duration: 80
		});
	}
};
// --- Main Game Loop ---
game.update = function () {
	// Update all birds
	for (var i = 0; i < birds.length; i++) {
		birds[i].update();
	}
	// Update all pigs
	for (var i = 0; i < pigs.length; i++) {
		pigs[i].update();
	}
	// Update all blocks
	for (var i = 0; i < blocks.length; i++) {
		blocks[i].update();
	}
	// --- Check support for each block: if not supported, set stopped = false so it falls ---
	for (var i = 0; i < blocks.length; i++) {
		var block = blocks[i];
		// Check if block is supported by ground or another block
		var supported = false;
		// Supported by ground
		if (Math.abs(block.y + block.height / 2 - groundY) < 2) {
			supported = true;
		}
		// Supported by another block below
		for (var j = 0; j < blocks.length; j++) {
			if (i === j) continue;
			var other = blocks[j];
			var blockBottom = block.y + block.height / 2;
			var otherTop = other.y - other.height / 2;
			var horizontalOverlap = block.x + block.width / 2 > other.x - other.width / 2 && block.x - block.width / 2 < other.x + other.width / 2;
			if (horizontalOverlap && Math.abs(blockBottom - otherTop) < 2) {
				supported = true;
				break;
			}
		}
		// If not supported, set stopped = false so it will fall
		if (!supported) {
			block.stopped = false;
		}
	}
	// Bird-block collision
	for (var i = 0; i < birds.length; i++) {
		var bird = birds[i];
		if (!bird.launched) continue;
		if (bird.stopped) continue;
		// Collide with blocks
		for (var j = 0; j < blocks.length; j++) {
			var block = blocks[j];
			// Remove block.stopped check so birds can always touch wood
			if (block.intersectsCircle(bird)) {
				// Calculate collision angle and force
				var angle = getAngle(bird.x, bird.y, block.x, block.y);
				var force = Math.sqrt(bird.vx * bird.vx + bird.vy * bird.vy) * 0.5;
				// Apply force to block
				block.vx += Math.cos(angle) * force * 0.7;
				block.vy += Math.sin(angle) * force * 0.7;
				// --- Ragdoll: add angular velocity to block based on bird impact ---
				var impact = force * 0.2;
				if (typeof block.angularVelocity === "undefined") block.angularVelocity = 0;
				block.angularVelocity += impact * (Math.random() - 0.5);
				// Apply bounce to bird
				bird.vx = -bird.vx * 0.4;
				bird.vy = -bird.vy * 0.4;
				// Move bird out of block to prevent sticking
				var overlap = bird.radius + Math.max(block.width, block.height) / 2 - getDistance(bird.x, bird.y, block.x, block.y);
				if (overlap > 0) {
					bird.x += Math.cos(angle) * overlap * 0.5;
					bird.y += Math.sin(angle) * overlap * 0.5;
				}
				// Optionally, mark block as not stopped to allow it to move if hit hard
				block.stopped = false;
				// Birds deal damage to woods on collision
				var birdDamage = Math.min(40, Math.max(5, Math.floor(force * 2)));
				block.health -= birdDamage;
				if (block.health <= 0) {
					block.destroy();
					blocks.splice(j, 1);
					j--; // Adjust index since we removed a block
					continue;
				}
			}
		}
	}
	// Bird-pig collision
	for (var i = 0; i < birds.length; i++) {
		var bird = birds[i];
		if (!bird.launched) continue;
		if (bird.stopped) continue;
		for (var j = 0; j < pigs.length; j++) {
			var pig = pigs[j];
			if (!pig.alive) continue;
			if (bird.intersectsCircle(pig)) {
				pig.alive = false;
				pig.visible = false;
				LK.setScore(LK.getScore() + 1000);
				scoreTxt.setText(LK.getScore());
			}
		}
	}
	// Block-pig collision (falling blocks can kill pigs)
	for (var i = 0; i < blocks.length; i++) {
		var block = blocks[i];
		if (block.stopped) continue;
		for (var j = 0; j < pigs.length; j++) {
			var pig = pigs[j];
			if (!pig.alive) continue;
			// Treat pig as circle, block as rectangle
			if (block.intersectsCircle(pig)) {
				// Only kill pig if block is moving fast enough (e.g. falling hard)
				var blockSpeed = Math.sqrt(block.vx * block.vx + block.vy * block.vy);
				if (blockSpeed > 8) {
					pig.alive = false;
					pig.visible = false;
					LK.setScore(LK.getScore() + 1000);
					scoreTxt.setText(LK.getScore());
				}
			}
		}
	}
	// --- Check support for each pig: if not supported, set stopped = false so it falls ---
	for (var i = 0; i < pigs.length; i++) {
		var pig = pigs[i];
		if (!pig.alive) continue;
		var supported = false;
		// Supported by ground
		if (Math.abs(pig.y + pig.radius - groundY) < 2) {
			supported = true;
		}
		// Supported by a block below
		for (var j = 0; j < blocks.length; j++) {
			var block = blocks[j];
			var pigBottom = pig.y + pig.radius;
			var blockTop = block.y - block.height / 2;
			var horizontalOverlap = pig.x + pig.radius > block.x - block.width / 2 && pig.x - pig.radius < block.x + block.width / 2;
			if (horizontalOverlap && Math.abs(pigBottom - blockTop) < 2) {
				supported = true;
				break;
			}
		}
		if (!supported) {
			pig.stopped = false;
		}
	}
	// Remove dead pigs
	var allPigsDead = true;
	for (var i = 0; i < pigs.length; i++) {
		if (pigs[i].alive) {
			allPigsDead = false;
			break;
		}
	}
	// If all pigs dead, win (only if there was at least one pig)
	if (pigs.length > 0 && allPigsDead) {
		LK.showYouWin();
		return;
	}
	// If current bird stopped, move to next bird
	if (currentBird && currentBird.launched && currentBird.stopped && !isDragging && launching) {
		birdIndex++;
		updateBirdsLeft();
		if (birdIndex < birds.length) {
			currentBird = birds[birdIndex];
			// Move next bird to slingshot
			tween(currentBird, {
				x: slingshotX,
				y: slingshotY
			}, {
				duration: 300,
				easing: tween.easeOut,
				onFinish: function onFinish() {
					launching = false;
				}
			});
		} else {
			// Out of birds, game over
			LK.showGameOver();
			return;
		}
		launching = false;
	}
};
// --- Start Game ---
setupLevel();