Yajilin Instructions

Rules: The challenge is to draw a single, closed loop and shade some cells, subject to the following rules:

1. Numbered cells indicate the amount of shaded cells in the corresponding direction of the arrow.
2. Shaded cells cannot touch horizontally or vertically but may touch diagonally. 
3. All remaining white cells should be traversed by a single closed loop, with no branches and which doesn't cross itself.
4. Empty grey cells are not considered part of the loop, and can be touched by shaded cells.