from tkinter import *


WIDTH = 400
HEIGHT = 400
SEG_SIZE = 20


class Segment:
    def __init__(self, x, y):
        self.instance = \
            c.create_rectangle(
                x, y, x + SEG_SIZE, \
                y + SEG_SIZE, fill='white')


class Snake:
    def __init__(self, segments):
        self.segments = segments
        self.dir = {
            "Down": (0, 1),
            "Right": (1, 0),
            "Up": (0, -1),
            "Left": (-1, 0)
        }
        self.vector = self.dir["Down"]

    def move(self):
        for i in range(len(self.segments) - 1):
            segment = self.segment[i].instance
            x1, y1, x2, y2 = c.coords(
                self.segments[i+1].instance)
            c.coords(segment, x1, y1, x2, y2)

        x1, y1, x2, y2 = c.coords(
            self.segments[-2].instance)
        c.coords(self.segments[-1].instance,
                 x1 + self.vector[0] * SEG_SIZE,
                 y1 + self.vector[1] * SEG_SIZE,
                 x2 + self.vector[0] * SEG_SIZE,
                 y2 + self.vector[1] * SEG_SIZE)

root = Tk()
root.title("Snake")

c = Canvas(root, width=WIDTH, \
           height=HEIGHT, bg="#4169e1")
c.grid()
c.focus_set()

root.mainloop()