import gnubg

def playMatchSeries( statsFile = None, # log file
                     matchLength = 7,
                     noOfMatches = 100,
                     sgfBasePath = None,  # optional
                     matBasePath = None): # optional
    """Starts noOfMatches matchLength pointers. For every match
    the running score, gammoms (g) and backgammons (b) and the match winner
    is written to 'statsFile':
    g       gammon
    b       backgammon
    (g)     gammon, but not relevsnt (end of match)
    (b)     backgammon, but not relevant
    g(b)    backgammon, but gammon would have been enough to win the match

    If the optional parameters 'sgfBasePath' and 'matBasePath' are set to a
    path, the matches are saved as sgf or mat file."""

    for i in range(0, noOfMatches):

        if not statsFile:
            raise ValueError('Parameter "statsFile" is mandatory')

        gnubg.command('new match ' + str(matchLength))

        matchInfo = formatMatchInfo(gnubg.match(analysis=0, boards=0))

        f = open(statsFile, 'a')
        f.write(matchInfo)
        f.close

        if sgfBasePath:
            gnubg.command('save match ' + sgfBasePath +\
                        str(i) + '.sgf')
        if matBasePath:
            gnubg.command('export match mat ' + matBasePath +\
                           str(i) + '.mat')



def formatMatchInfo(matchInfo):
    outString = ''
    tempS = ''
    score = [0,0]
    matchLength = matchInfo['match-info']['match-length']
    for game in matchInfo['games']:
        pw = game['info']['points-won']
        if game['info']['winner'] == 'O':
            oldScore = score[0]
            score[0] += pw
            winner = 0
        else:
            oldScore = score[1]
            score[1] += pw
            winner =1

        cube = getCube(game)
        print 'cube: ', cube

        if pw == cube:
            gammon = ''
        elif pw == 2 * cube:
            gammon = 'g'
            if (cube + oldScore) >= matchLength: # gammon not relevant
                gammon = '(g)'

        elif pw == 3 * cube:
            gammon = 'b'

            if (cube + oldScore) >= matchLength: # backgammon not relevant
                gammon = '(b)'
            elif (2 * cube + oldScore) >= matchLength:
                # backgammon not relevant, but gammon
                gammon = 'g(b)'

        outString += '%d:%d%s ' % (score[0], score[1], gammon)

    outString += str(winner) + '\n'

    return outString

def getCube(game):
    """returns the cube value of the game"""
    doubled = 0
    cube = 1
    for turn in game['game']:
        if turn['action'] == 'double':
            doubled = 1
            continue

        if doubled:
            if turn['action'] == 'take':
                cube *= 2
                doubled = 0
            else: # dropped
                break
    return cube