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

/**** 
* Classes
****/ 
// Monster class for AI movement and attack
var Monster = Container.expand(function () {
	var self = Container.call(this);
	self.type = null;
	self.col = 0;
	self.row = 0;
	self.targetCol = 0;
	self.targetRow = 0;
	self.lastCol = 0;
	self.lastRow = 0;
	self.moveSpeed = 8; // px per frame, slower than player
	self.path = null;
	self.pathStepIndex = 0;
	self.isMoving = false;
	self.attackCooldown = 0;
	self.attackDelay = 60; // frames between attacks
	self.asset = null;
	// Set up monster asset
	self.init = function (type, col, row) {
		self.type = type;
		self.col = col;
		self.row = row;
		self.targetCol = col;
		self.targetRow = row;
		var assetId = type;
		self.asset = self.attachAsset(assetId, {
			anchorX: 0.5,
			anchorY: 0.5,
			width: MAZE_CELL_SIZE * 0.8,
			height: MAZE_CELL_SIZE * 0.8
		});
		self.x = col * MAZE_CELL_SIZE + MAZE_CELL_SIZE / 2;
		self.y = row * MAZE_CELL_SIZE + MAZE_CELL_SIZE / 2;
	};
	// Find path to player using BFS
	self.findPathToPlayer = function (playerCol, playerRow) {
		// Defensive: check bounds
		if (playerCol < 0 || playerCol >= MAZE_COLS || playerRow < 0 || playerRow >= MAZE_ROWS) return null;
		if (maze[playerRow][playerCol] === 1) return null;
		var queue = [];
		var visited = [];
		for (var y = 0; y < MAZE_ROWS; y++) {
			visited[y] = [];
			for (var x = 0; x < MAZE_COLS; x++) {
				visited[y][x] = false;
			}
		}
		var prev = [];
		for (var y = 0; y < MAZE_ROWS; y++) {
			prev[y] = [];
			for (var x = 0; x < MAZE_COLS; x++) {
				prev[y][x] = null;
			}
		}
		queue.push({
			col: self.col,
			row: self.row
		});
		visited[self.row][self.col] = true;
		var found = false;
		while (queue.length > 0) {
			var curr = queue.shift();
			if (curr.col === playerCol && curr.row === playerRow) {
				found = true;
				break;
			}
			var dirs = [{
				dc: 0,
				dr: -1
			},
			// up
			{
				dc: 0,
				dr: 1
			},
			// down
			{
				dc: -1,
				dr: 0
			},
			// left
			{
				dc: 1,
				dr: 0
			} // right
			];
			for (var d = 0; d < dirs.length; d++) {
				var nc = curr.col + dirs[d].dc;
				var nr = curr.row + dirs[d].dr;
				if (nc >= 0 && nc < MAZE_COLS && nr >= 0 && nr < MAZE_ROWS && !visited[nr][nc] && maze[nr][nc] !== 1) {
					queue.push({
						col: nc,
						row: nr
					});
					visited[nr][nc] = true;
					prev[nr][nc] = {
						col: curr.col,
						row: curr.row
					};
				}
			}
		}
		if (!found) return null;
		// Reconstruct path
		var path = [];
		var currCol = playerCol,
			currRow = playerRow;
		while (!(currCol === self.col && currRow === self.row)) {
			path.unshift({
				col: currCol,
				row: currRow
			});
			var p = prev[currRow][currCol];
			currCol = p.col;
			currRow = p.row;
		}
		return path;
	};
	// Monster update: move toward player, attack if adjacent
	self.update = function () {
		// Track last position for event logic
		self.lastCol = self.col;
		self.lastRow = self.row;
		// Only recalc path every 15 frames for performance
		if (LK.ticks % 15 === 0 || !self.path || self.path.length === 0) {
			self.path = self.findPathToPlayer(charCol, charRow);
			self.pathStepIndex = 0;
		}
		// If adjacent to player, attack
		var dx = Math.abs(self.col - charCol);
		var dy = Math.abs(self.row - charRow);
		if (dx + dy === 1) {
			// Attack cooldown
			if (self.attackCooldown <= 0) {
				// Show attack effect
				var effect = LK.getAsset('attackEffect', {
					anchorX: 0.5,
					anchorY: 0.5,
					x: charNode.x,
					y: charNode.y,
					width: MAZE_CELL_SIZE * 0.7,
					height: MAZE_CELL_SIZE * 0.7
				});
				effect.alpha = 1;
				game.addChild(effect);
				// Defensive: ensure effect is defined and tween is a function
				if (effect && typeof tween === "function" && typeof tween(effect).to === "function") {
					tween(effect).to({
						alpha: 0
					}, 400).onComplete(function () {
						effect.destroy();
					});
				}
				// Flash screen red and show jump scare before game over
				LK.effects.flashScreen(0xff0000, 800);
				// Create a jump scare overlay (big zombie face in center, fades in/out)
				var jumpScare = LK.getAsset('zombie', {
					anchorX: 0.5,
					anchorY: 0.5,
					x: GAME_WIDTH / 2,
					y: GAME_HEIGHT / 2,
					width: GAME_WIDTH * 0.8,
					height: GAME_WIDTH * 0.8
				});
				jumpScare.alpha = 0;
				game.addChild(jumpScare);
				// Fade in, then out, then game over
				if (typeof tween === "function") {
					tween(jumpScare).to({
						alpha: 1
					}, 120).onComplete(function () {
						tween(jumpScare).to({
							alpha: 0
						}, 400).onComplete(function () {
							jumpScare.destroy();
							LK.showGameOver();
						});
					});
				} else {
					// Fallback: just show game over
					LK.showGameOver();
				}
				self.attackCooldown = self.attackDelay;
			}
		} else if (self.path && self.path.length > 0 && self.pathStepIndex < self.path.length) {
			// Move toward next cell in path
			var next = self.path[self.pathStepIndex];
			var targetX = next.col * MAZE_CELL_SIZE + MAZE_CELL_SIZE / 2;
			var targetY = next.row * MAZE_CELL_SIZE + MAZE_CELL_SIZE / 2;
			var ddx = targetX - self.x;
			var ddy = targetY - self.y;
			var dist = Math.sqrt(ddx * ddx + ddy * ddy);
			if (dist > 2) {
				var step = Math.min(self.moveSpeed, dist);
				self.x += ddx / dist * step;
				self.y += ddy / dist * step;
			} else {
				// Snap to cell
				self.x = targetX;
				self.y = targetY;
				self.col = next.col;
				self.row = next.row;
				self.pathStepIndex++;
			}
		}
		if (self.attackCooldown > 0) self.attackCooldown--;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
// No classes needed for maze logic
var game = new LK.Game({
	backgroundColor: 0x181818
});

/**** 
* Game Code
****/ 
// Game constants
var GAME_WIDTH = 2048;
var GAME_HEIGHT = 2732;
// Maze configuration
// 0 = empty, 1 = wall, 2 = start, 3 = goal
// Each cell is 128x128 px, so 16x21 grid fits in 2048x2688
var MAZE_CELL_SIZE = 128;
var MAZE_COLS = 16;
var MAZE_ROWS = 21;
// Example maze: outer walls, a few inner walls, start at (1,1), goal at (14,19)
var maze = [];
for (var y = 0; y < MAZE_ROWS; y++) {
	maze[y] = [];
	for (var x = 0; x < MAZE_COLS; x++) {
		if (y === 0 || y === MAZE_ROWS - 1 || x === 0 || x === MAZE_COLS - 1) {
			maze[y][x] = 1; // border wall
		} else {
			maze[y][x] = 0; // empty
		}
	}
}
// Add a much harder maze pattern with more inner walls and dead ends
for (var i = 2; i < 14; i++) {
	maze[3][i] = 1;
	maze[7][i] = 1;
	maze[12][i] = 1;
	maze[16][i] = 1;
}
// Add vertical walls and dead ends
for (var i = 2; i < 19; i++) {
	if (i !== 7 && i !== 12) maze[i][4] = 1;
	if (i !== 3 && i !== 16) maze[i][11] = 1;
}
for (var i = 5; i < 11; i++) {
	maze[9][i] = 1;
}
for (var i = 6; i < 15; i++) {
	if (i !== 10) maze[15][i] = 1;
}
for (var i = 2; i < 8; i++) {
	maze[i][7] = 1;
}
for (var i = 13; i < 19; i++) {
	maze[i][8] = 1;
}
maze[5][2] = 1;
maze[6][2] = 1;
maze[8][2] = 1;
maze[10][2] = 1;
maze[14][2] = 1;
maze[18][2] = 1;
maze[2][13] = 1;
maze[4][13] = 1;
maze[6][13] = 1;
maze[8][13] = 1;
maze[10][13] = 1;
maze[14][13] = 1;
maze[18][13] = 1;
maze[1][1] = 2; // start
maze[19][14] = 3; // goal
// Score display
var scoreTxt = new Text2('0', {
	size: 120,
	fill: 0xFFF700
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Draw maze walls and monsters
var wallNodes = [];
var monsterNodes = [];
// Place monsters at specific hard maze locations for challenge
var monsterSpawns = [{
	type: 'skeleton',
	col: 5,
	row: 5
}, {
	type: 'goldenZombie',
	col: 10,
	row: 10
}, {
	type: 'goldenSkeleton',
	col: 7,
	row: 15
}, {
	type: 'goldenZombie',
	col: 12,
	row: 6
}, {
	type: 'goldenZombie',
	col: 3,
	row: 17
}];
for (var y = 0; y < MAZE_ROWS; y++) {
	for (var x = 0; x < MAZE_COLS; x++) {
		if (maze[y][x] === 1) {
			var wall = LK.getAsset('base', {
				anchorX: 0.5,
				anchorY: 0.5,
				x: x * MAZE_CELL_SIZE + MAZE_CELL_SIZE / 2,
				y: y * MAZE_CELL_SIZE + MAZE_CELL_SIZE / 2,
				width: MAZE_CELL_SIZE,
				height: MAZE_CELL_SIZE
			});
			wallNodes.push(wall);
			game.addChild(wall);
		}
		if (maze[y][x] === 3) {
			// Goal marker
			var goalNode = LK.getAsset('goldenZombie', {
				anchorX: 0.5,
				anchorY: 0.5,
				x: x * MAZE_CELL_SIZE + MAZE_CELL_SIZE / 2,
				y: y * MAZE_CELL_SIZE + MAZE_CELL_SIZE / 2,
				width: MAZE_CELL_SIZE,
				height: MAZE_CELL_SIZE
			});
			game.addChild(goalNode);
		}
		// Place monsters at their spawn locations
		for (var mi = 0; mi < monsterSpawns.length; mi++) {
			var m = monsterSpawns[mi];
			if (m.col === x && m.row === y) {
				var monster = new Monster();
				monster.init(m.type, x, y);
				monsterNodes.push(monster);
				game.addChild(monster);
			}
		}
	}
}
// Character
var charNode = LK.getAsset('zombie', {
	anchorX: 0.5,
	anchorY: 0.5,
	width: MAZE_CELL_SIZE * 0.8,
	height: MAZE_CELL_SIZE * 0.8
});
game.addChild(charNode);
// Find start position
var charCol = 1,
	charRow = 1;
for (var y = 0; y < MAZE_ROWS; y++) {
	for (var x = 0; x < MAZE_COLS; x++) {
		if (maze[y][x] === 2) {
			charCol = x;
			charRow = y;
		}
	}
}
charNode.x = charCol * MAZE_CELL_SIZE + MAZE_CELL_SIZE / 2;
charNode.y = charRow * MAZE_CELL_SIZE + MAZE_CELL_SIZE / 2;
// Movement state
var moveTargetCol = charCol;
var moveTargetRow = charRow;
var isMoving = false;
var moveSpeed = 16; // px per frame
// Touch/drag movement: tap or drag to adjacent cell
function getCellFromPos(x, y) {
	var col = Math.floor(x / MAZE_CELL_SIZE);
	var row = Math.floor(y / MAZE_CELL_SIZE);
	return {
		col: col,
		row: row
	};
}
// Simple BFS pathfinding to allow tap-to-move to any reachable cell
function findPath(startCol, startRow, endCol, endRow) {
	// Defensive: check bounds
	if (endCol < 0 || endCol >= MAZE_COLS || endRow < 0 || endRow >= MAZE_ROWS) return null;
	if (maze[endRow][endCol] === 1) return null;
	var queue = [];
	var visited = [];
	for (var y = 0; y < MAZE_ROWS; y++) {
		visited[y] = [];
		for (var x = 0; x < MAZE_COLS; x++) {
			visited[y][x] = false;
		}
	}
	var prev = [];
	for (var y = 0; y < MAZE_ROWS; y++) {
		prev[y] = [];
		for (var x = 0; x < MAZE_COLS; x++) {
			prev[y][x] = null;
		}
	}
	queue.push({
		col: startCol,
		row: startRow
	});
	visited[startRow][startCol] = true;
	var found = false;
	while (queue.length > 0) {
		var curr = queue.shift();
		if (curr.col === endCol && curr.row === endRow) {
			found = true;
			break;
		}
		var dirs = [{
			dc: 0,
			dr: -1
		},
		// up
		{
			dc: 0,
			dr: 1
		},
		// down
		{
			dc: -1,
			dr: 0
		},
		// left
		{
			dc: 1,
			dr: 0
		} // right
		];
		for (var d = 0; d < dirs.length; d++) {
			var nc = curr.col + dirs[d].dc;
			var nr = curr.row + dirs[d].dr;
			if (nc >= 0 && nc < MAZE_COLS && nr >= 0 && nr < MAZE_ROWS && !visited[nr][nc] && maze[nr][nc] !== 1) {
				queue.push({
					col: nc,
					row: nr
				});
				visited[nr][nc] = true;
				prev[nr][nc] = {
					col: curr.col,
					row: curr.row
				};
			}
		}
	}
	if (!found) return null;
	// Reconstruct path
	var path = [];
	var currCol = endCol,
		currRow = endRow;
	while (!(currCol === startCol && currRow === startRow)) {
		path.unshift({
			col: currCol,
			row: currRow
		});
		var p = prev[currRow][currCol];
		currCol = p.col;
		currRow = p.row;
	}
	return path;
}
var pathToFollow = null;
var pathStepIndex = 0;
game.down = function (x, y, obj) {
	// Prevent new move if already moving
	if (isMoving) return;
	var cell = getCellFromPos(x, y);
	// Defensive: check bounds
	if (cell.col < 0 || cell.col >= MAZE_COLS || cell.row < 0 || cell.row >= MAZE_ROWS) return;
	// Don't move if already at that cell
	if (cell.col === charCol && cell.row === charRow) return;
	// Find path
	var path = findPath(charCol, charRow, cell.col, cell.row);
	if (path && path.length > 0) {
		pathToFollow = path;
		pathStepIndex = 0;
		moveTargetCol = pathToFollow[0].col;
		moveTargetRow = pathToFollow[0].row;
		isMoving = true;
	}
};
game.move = function (x, y, obj) {
	// Only allow drag-move if not already moving
	if (!isMoving) {
		game.down(x, y, obj);
	}
};
game.up = function (x, y, obj) {
	// No-op
};
game.update = function () {
	// Move character toward target cell
	var targetX = moveTargetCol * MAZE_CELL_SIZE + MAZE_CELL_SIZE / 2;
	var targetY = moveTargetRow * MAZE_CELL_SIZE + MAZE_CELL_SIZE / 2;
	var dx = targetX - charNode.x;
	var dy = targetY - charNode.y;
	var dist = Math.sqrt(dx * dx + dy * dy);
	if (isMoving && dist > 2) {
		var step = Math.min(moveSpeed, dist);
		charNode.x += dx / dist * step;
		charNode.y += dy / dist * step;
	} else if (isMoving) {
		// Snap to cell
		charNode.x = targetX;
		charNode.y = targetY;
		charCol = moveTargetCol;
		charRow = moveTargetRow;
		// If following a path, advance to next step
		if (typeof pathToFollow !== "undefined" && pathToFollow && pathStepIndex < pathToFollow.length - 1) {
			pathStepIndex++;
			moveTargetCol = pathToFollow[pathStepIndex].col;
			moveTargetRow = pathToFollow[pathStepIndex].row;
			// Remain isMoving = true
		} else {
			isMoving = false;
			pathToFollow = null;
			pathStepIndex = 0;
			// Check for goal
			if (maze[charRow][charCol] === 3) {
				LK.effects.flashScreen(0x00ff00, 800);
				LK.showYouWin();
			}
		}
	}
	// Update all monsters
	for (var i = 0; i < monsterNodes.length; i++) {
		if (monsterNodes[i] && typeof monsterNodes[i].update === "function") {
			monsterNodes[i].update();
		}
	}
	// Show current cell in score text (for debugging movement)
	scoreTxt.setText("Cell: " + charCol + "," + charRow);
};

===================================================================
--- original.js
+++ change.js
@@ -151,9 +151,9 @@
 				});
 				effect.alpha = 1;
 				game.addChild(effect);
 				// Defensive: ensure effect is defined and tween is a function
-				if (effect && typeof tween === "function") {
+				if (effect && typeof tween === "function" && typeof tween(effect).to === "function") {
 					tween(effect).to({
 						alpha: 0
 					}, 400).onComplete(function () {
 						effect.destroy();