# This class implements a thread that handles the networking connection.
# It expects a copy of the board and an open socket to the remote host, which
# it will bind to a GTPSocket.
# This is the only thread that should be calling get(), but send() could be called
# twice, so we wrap it in a mutex.
# The board is also wrapped in a mutex, even though only this thread should modify it
# if it exists.

import threading


class NetworkThread(threading.Thread):
    dispatcher = {
        'quit': do_quit,
        'boardsize': do_boardsize,
        'clear_board': do_clear_board,
        'komi': do_komi,
        'play': do_play,
        'genmove': do_genmove
        }


    def __init__(self, goban, socket):
        self.goban = goban
        self.goban_lock = threading.Lock()
        self.socket = GTPSocket(socket)
        self.send_lock = threading.Lock()

        GTPSocket.known_cmds = GTPSocket.known_cmds & set(NetworkThread.dispatcher.keys())


    def run(self):
        while True:
            gtp = self.socket.get()
            if gtp is not None:
                NetworkThread.dispatcher[gtp.command](gtp)


    def do_quit(self, gtp):
        pass


    def do_boardsize(self, gtp):
        with self.goban_lock:
            self.goban.set_board_size(int(gtp.arguments[0]))


    def do_clear_board(self, gtp):
        with self.goban_lock:
            self.goban.reset()


    def do_komi(self, gtp):
        with self.goban_lock:
            self.goban.komi = float(gtp.arguments[0])


    def do_play(self, gtp):
        if gtp.arguments[0] == 'black':
            color = goban.Goban.BLACK
        elif gtp.arguments[0] == 'white':
            color = goban.Goban.WHITE

        row = int(gtp.arguments[1][1:])
        col = ord(gtp.arguments[1][0]) - 96

        with self.goban_lock:
            self.goban.play_move((row,col), color)


    def do_genmove(self, gtp):
        pass