from turtle import *

def main():
#Instruction for the main loop.
    home()
    delay(25)
    gotostart(map)
    debuginfo()
    drawmap(map)
    done()

#Define cardinal directions.
direct = {
    'NORTH': 90,
    'EAST': 0,
    'SOUTH': 270,
    'WEST': 180}

#Define box size (boxes are squares).
boxsize = 50

#Define box colors.
tileset = {
    'GRASS': 0,
    'WATER': 1,
    'SAND': 2,
    'ROCK': 3}

#Define our map to draw.
map = [3,           #Set row width.
        3, 0, 0,    #Row data.
        0, 2, 1,
        2, 1, 1]

#Used to keep track of the last box drawn.
lastbox = 0

def draw_tile(tile):
#Draws a singular tile.

    #Set color of tile
    if tile == tileset['GRASS']:
        color('brown', 'green')
    elif tile == tileset['WATER']:
        color('blue', 'aqua')
    elif tile == tileset['SAND']:
        color('brown', 'yellow')
    elif tile == tileset['ROCK']:
        color('gray', 'gray')
    else:
        unknown_tile()

    #Draw a box.
    down()
    begin_fill()
    seth(direct['NORTH'])
    forward(boxsize)
    seth(direct['WEST'])
    forward(boxsize)
    seth(direct['SOUTH'])
    forward(boxsize)
    seth(direct['EAST'])
    forward(boxsize)
    end_fill()
    up()

def move(m, lastbox):
#Determines where to begin drawing the next box.
    w = m[0]                    #Make a copy of the map's width value.
    forward(boxsize)            #Always start by moving forward one box.
    if lastbox < (w + 1):       #If the box is in the first row...
        pass                    #Do nothing.
    if lastbox % w == 0:        #If the last box was the last in the row...
        right(90)               #Turn toward the bottom of the current box.
        forward(boxsize)        #Go to the bottom of the current box.
        right(90)               #Turn to the left of the current box.
        forward(boxsize * w)    #Move all the way down te row.
        right(90)               #Get in position for next row.

def drawmap(m):
#Print the entire map.
    for x in range (0, len(m)):
        if x == 0:
            print("Reading map data....") #Not really, just skipping index 0.
        else:
            draw_tile(map[x])
            lastbox = x
            tileinfo(x)
            move(m, lastbox)

def gotostart(m):
#Go to the top left of the map.
#Makes maps more or less centered.
    up()
    topleft = ((m[0] * boxsize) / 2) #Row width * box size in px, halfed.
    setpos (-topleft, topleft)
    down()

def debuginfo():
#Numbers and stats that help me develop.
#Printed into sysout.
    print ("Animation delay: ", end='')
    print (delay())
    print ("Tile size: ", end='')
    print (boxsize)
    print ("Tileset: ", end='')
    print (tileset)
    print ("Map Width: " , end='')
    print (map[0])
    print ("Map Data: ", end='')
    print (map[1:])
    print ("Turtle Start Point: ", end='')
    print (position(), end = '')
    print (heading())

def tileinfo(index):
    print ("Drew tile ", end='')
    print (index, end='')
    print (getcoords(index), end='')
    print (" as color ", end='')
    print (map[index])

def getcoords(index):
    print (" (", end='')
    print ((index // map[0]) + 1, end='')
    print (",", end='')
    if (index % map[0]) == 0:
        print (map[0], end='')
    else:
        print (index % map[0], end='')
    print (")")

#Run the main program loop.
main()