#!/usr/bin/python
# -*- coding: utf-8 -*-

#Maze Generator using unicode line drawing chars
#by Vidar 'koala_man' Holen
#www.vidarholen.net

#See the online demo on 
#http://www.vidarholen.net/~vidar/generatemaze.py

from random import *
from sys import *

picwidth=20
picheight=20
if len(argv)>1:
    picwidth=int(argv[1])
    if len(argv)>2:
        picheight=int(argv[2])
        
width=picwidth #(picwidth)/2+1
height=picheight #(picheight)/2+1

#print "Generating %dx%d maze" % (width,height)

map=[] # map[x][y]
for i in range(width):
    n=[]
    for j in range(height):
        n.append([1,1,0,0,0]) #right, bottom, captured, backtrack, color
    map.append(n)
    
for y in range(height):
    map[0][y]=[1,0,1,0,0];
    map[width-1][y]=[1,0,1,0,0];

for x in range(width):
    map[x][0]=[0,1,1,0,0]
    map[x][height-1]=[0,1,1,0,0]

map[0][0]=[0,0,1,0,0]
map[width-1][0]=[0,0,1,0,0]


playerstart=(1,1)
playerexit=(width-1,height-1)
mazestart=playerstart

x,y=mazestart
backtrack=1
captures=0
solutiontrack=0

while 1:
    if (x,y)==playerexit:
        solutiontrack=backtrack

    if solutiontrack>0 and solutiontrack==map[x][y][3]:
        solutiontrack=solutiontrack-1
        map[x][y][4]=2

    if map[x][y][2]==0:
        map[x][y][2]=1
        captures=captures+1
        if captures%10000==0:
            print >> stderr, 100*captures/(width*height), "%" 

#    map[x][y][2]=1 
    map[x][y][3]=backtrack
    possibilities=[]
    for a,b in [(x+1,y),(x-1,y),(x,y+1),(x,y-1)]:
        if a>=0 and a<width and b>=0 and b<height:
            if map[a][b][2]==0:
                possibilities.append((a,b))

    if len(possibilities)==0:
        map[x][y][3]=0
        backtrack=backtrack-1
        if backtrack==0:
            break
        for a,b in [(x+1,y),(x-1,y),(x,y+1),(x,y-1),(-1,-1)]:
            if a>=0 and a<width and b>=0 and b<height:
                if map[a][b][3]==backtrack:
                    break
                
        x=a
        y=b
        continue
    
    pos=randint(0,len(possibilities)-1)
    a,b=possibilities[pos]
    if a<x: map[a][b][0]=0
    if a>x: map[x][y][0]=0
    if b<y: map[a][b][1]=0
    if b>y: map[x][y][1]=0
    x=a
    y=b
    backtrack=backtrack+1
 
print >> stderr, "Done,", captures, "visited"

pixmap=[] 
for i in range(width):
    pixmap.append([0]*height)

#chars=[' ','╶','╷','╭','╴','─','╮','┬','╵','╰','│','├','╯','┴','┤','┼']
chars=[' ','╶','╷','┌','╴','─','┐','┬','╵','└','│','├','┘','┴','┤','┼']

for y in range(0,height-1):
    for x in range(0,width-1):
        u=map[x][y][0]
        l=map[x][y][1]
        d=map[x][y+1][0]
        r=map[x+1][y][1]
        char=u*8+l*4+d*2+r;
        stdout.write(chars[char])
        if r==0:
            stdout.write(chars[0]);
        else:
            stdout.write(chars[5]);
    stdout.write('\n')

exit(0)
for y in range(-1,picheight):
    for x in range(-1,picwidth):
        n=pixmap[x][y]
        if n==0: stdout.write('\xFF\xFF\xFF')
        elif n==1: stdout.write('\x00\x00\x00')
        elif n==2: stdout.write('\xFF\xFF\xFF') #show solution
        elif n==3: stdout.write('\x00\x00\xFF')
        else: stdout.write('\xFF\x00\xFF')