# Copyright (C) 2012 Team tiramisu (see README for all contributors)
#
# 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# The original `Config` design model is unproudly borrowed from 
# the rough gus of pypy: pypy: http://codespeak.net/svn/pypy/dist/pypy/config/
# the whole pypy projet is under MIT licence
# ____________________________________________________________
"enables us to carry out a calculation and return an option's value"
from tiramisu.error import DisabledOptionError, SpecialOwnersError
# ____________________________________________________________
# automatic Option object
special_owners = ['auto', 'fill']
                  
def special_owner_factory(name, owner, value, 
                          callback, callback_params=None, config=None):
    # in case of an 'auto' and a 'fill' without a value, 
    # we have to carry out a calculation
    return calc_factory(name, callback, callback_params, config)

#g = globals()

def calc_factory(name, callback, callback_params, config):
    # FIXME we have to know the exact status of the config 
    # not to disrupt it
    # config.freeze()
    if callback_params is None:
        callback_params = {}
    tcparams = {}
    for key, value in callback_params.items():
        if type(value) == tuple:
            path, check_disabled = value
            try:
                opt_value = getattr(config, path)
            except DisabledOptionError, e:
                if chek_disabled:
                    continue
                raise DisabledOptionError(e)
            tcparams[key] = opt_value
        else:
            tcparams[key] = value
    try:
        #return getattr(autolib, callback)(name, config)
        #return g[callback](name, config, **callback_params)
        from creole import eosfunc
        return getattr(eosfunc, callback)(**tcparams) 
    except AttributeError:
        import traceback
        traceback.print_exc()
        raise SpecialOwnersError("callback: {0} not found for "
                                           "option: {1}".format(callback, name))