from turtle import Turtle
import random

STARTING_POSITION = [(0, 0), (-20, 0), (-40, 0)]
MOVE_DISTANCE = 20
UP = 90
DOWN = 270
LEFT = 180
RIGHT = 0

color_list = ['#d4955f', '#d7503e', '#2f5e8e', '#e7da5c', '#94425b', '#7aa7c3',
              '#d14659', '#c08c9f', '#27835b', '#4ba460', '#333766',
              '#e9dc0c', '#9fb136', '#23a4c4', '#a4d1bb', '#97cedc', 'white', 'blue', 'red']


class Snake:
    def __init__(self):
        self.segments = []
        self.create_snake()
        self.head = self.segments[0]

    def create_snake(self):
        for position in STARTING_POSITION:
            self.add_segment(position)

    def add_segment(self, position):
        new_segment = Turtle('circle')
        new_segment.color(random.choice(color_list))
        new_segment.penup()
        new_segment.goto(position)
        self.segments.append(new_segment)

    def extend(self):
        self.add_segment(self.segments[-1].position())

    def move(self):
        for seg_num in range(len(self.segments) - 1, 0, -1):
            new_x = self.segments[seg_num - 1].xcor()
            new_y = self.segments[seg_num - 1].ycor()
            self.segments[seg_num].goto(new_x, new_y)
        self.head.forward(MOVE_DISTANCE)
        # self.segments[0].fd(20)

    def reset(self):
        for seg in self.segments:
            seg.goto(1000, 1000)
        self.segments.clear()
        self.create_snake()
        self.head = self.segments[0]

    def up(self):
        if self.head.heading() != DOWN:
            self.head.setheading(UP)

    def down(self):
        if self.head.heading() != UP:
            self.head.setheading(DOWN)

    def right(self):
        if self.head.heading() != LEFT:
            self.head.setheading(RIGHT)

    def left(self):
        if self.head.heading() != RIGHT:
            self.head.setheading(LEFT)
