__license__ = """
NML 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.

NML 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 NML; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA."""

from nml import generic, global_constants
from .base_expression import Expression

class CargoExpression(Expression):
    def __init__(self, cargotype, value, pos):
        Expression.__init__(self, pos)
        assert isinstance(value, list)
        self.cargotype = cargotype
        self.value = value

    def cargolabel(self):
        for label, number in global_constants.cargo_numbers.items():
            if number == self.cargotype:
                return label
        assert False, "Cargo expression with unregistered cargotype at " + str(self.pos)

    def debug_print(self, indentation):
        if self.value is None:
            generic.print_dbg(indentation, '{0} cargo {1}'.format(self._debugname, self.cargolabel()))
        else:
            generic.print_dbg(indentation, '{0} cargo {1} with result:'.format(self._debugname, self.cargolabel()))
            self.value.debug_print(indentation + 2)

    def __str__(self):
        return '{0}({1}, {2})'.format(self._fnname, self.cargolabel(), str(self.value))

    def reduce(self, id_dicts = [], unknown_id_fatal = True):
        return self

class AcceptCargo(CargoExpression):
    _fnname = 'accept_cargo'
    _debugname = 'Accept'

class ProduceCargo(CargoExpression):
    _fnname = 'produce_cargo'
    _debugname = 'Produce'
