import shapely
from shapely.geometry import Point, Polygon

with open(r'day9/input.txt', 'r') as input:
    lines = list(map(lambda x: list(map(lambda y: int(y),x.split(','))),input.read().split('\n')[:-1]))

points = []

def surface(a,b):
    return (abs(a.x-b.x)+1)*(abs(a.y-b.y)+1)


for line in lines:
    points.append(Point(line[0],line[1]))

points.append(points[0])

polygon = Polygon([p.x,p.y] for p in points)

bestarea = shapely.area(shapely.box(0,0,0,0))

for i in range(len(points)):
    print(i)
    for j in range(i):
        minx = min(points[i].x,points[j].x)
        miny = min(points[i].y,points[j].y)
        maxx = max(points[i].x,points[j].x)
        maxy = max(points[i].y,points[j].y)
        box = shapely.box(minx,miny,maxx,maxy)
        box_surface = surface(points[i],points[j]) 
        if box_surface > bestarea and shapely.contains(polygon,box):
            bestarea = box_surface
print(bestarea)