# -*- coding: UTF-8 -*-
# Copyright 2007-2008 One Laptop Per Child
# Copyright 2008 Andrés Ambrois <andresambrois@gmail.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

from subprocess import Popen, PIPE
import logging

logger = logging.getLogger('PlayGo')

class gnugo:
    ''' A wrapper for talking to gnugo over GTP '''
    def __init__(self, boardsize=19, color='black', handicap=0, komi=5.5, level=3):
        ''' Start the gnugo subprocess '''
        self.color = color
        try: 
            self.gnugo = Popen(['gnugo', '--mode', 'gtp', '--boardsize', str(boardsize),
                                '--handicap', str(handicap), '--komi', str(komi), '--level', str(level) ], 
                                stdout=PIPE, stdin=PIPE)
        except:
            logger.error('Could not start gnugo subprocess')
        else:
            logger.debug('Successfuly loaded gnugo!')
            self.stdin = self.gnugo.stdin
            self.stdout = self.gnugo.stdout
    
    def __del__(self):
        self.stdin.write('quit \n')
    
    def _xy_to_coords(self, x, y):
        return dict(zip(range(0, 26), 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'))[x] + str(y)
        
    def _coords_to_xy(self, coords):
        return int(dict(zip('ABCDEFGHIJKLMNOPQRSTUVWXYZ', range(0, 26)))[coords[0]]), int(coords[1:])
    
    def make_play(self, x, y):
        self.stdin.write('play %s %s\n' % (self.color, self._xy_to_coords(x, y)))
        self.stdin.flush()
        output = self.stdout.readline()
        self.stdout.readline()
        if output[0] == '?':
            return False
        return True
    
    def get_move(self, color):
        self.stdin.write('genmove %s\n' % color)
        self.stdin.flush()
        output = self.stdout.readline()
        self.stdout.readline()
        if output[0] == '?':
            # FIXME: Handle error
            return False
        return self._coords_to_xy(output[2:])