#   This file is part of PARPG.

#   PARPG 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 3 of the License, or
#   (at your option) any later version.

#   PARPG 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 PARPG.  If not, see <http://www.gnu.org/licenses/>.

import sys
import character

ENTITIES = [character.Character]

def getAllEntities ():
    """Returns a dictionary with the names of the entity classes
       mapped to the classes themselves"""
    result = {}
    for entity in ENTITIES:
        result[entity.__name__] = entity
    return result

def createEntity(info, extra = None):
    """Called when we need to get an actual object.
       @type info: dict
       @param info: stores information about the object we want to create
       @type extra: dict
       @param extra: stores additionally required attributes
       @return: the object"""
    # First, we try to get the type and world, which every game_obj needs.
    extra = extra or {}
    try:
        ent_type = info.pop('type')
        world = info.pop('world')
    except KeyError:
        sys.stderr.write("Error: Game object missing type or world.")
        sys.exit(False)

    # add the extra info
    for key, val in extra.items():
        info[key] = val

    # this is for testing purposes
    try:
        return getAllEntities()[ent_type](world, **info)
    except KeyError:
        return None