var Tile = require('../Tile'); 
var IsInLayerBounds = require('./IsInLayerBounds'); 
var RecalculateFacesAt = require('./RecalculateFacesAt'); 
var RemoveTileAt = function (tileX, tileY, replaceWithNull, recalculateFaces, layer){ 
if (replaceWithNull === undefined) { 
replaceWithNull = false ; 
} 
if (recalculateFaces === undefined) { 
recalculateFaces = true ; 
} 
if (!IsInLayerBounds(tileX, tileY, layer)) { 
return null ; 
} 
var tile = layer.data[tileY][tileX]; 
if (tile === null ) { 
return null ; 
} 
 else { 
layer.data[tileY][tileX] = replaceWithNull? null : new Tile(layer, -1, tileX, tileY, tile.width, tile.height); 
} 
if (recalculateFaces && tile && tile.collides) { 
RecalculateFacesAt(tileX, tileY, layer); 
} 
return tile; 
} 
; 
module.exports = RemoveTileAt;