"""All decorators, that are created by this package.

Imports:

- :func:`.user.vUser` -- a validator for apikeys.
- :func:`.pool.runInDBPool` -- runs a actual function in dbpool.
"""
import types

from .user import vUser
from .schema import Offer
from .dbdefer import  dbdefer
from .pool import runInDBPool

from ..error import ValidateException

@dbdefer
def vRoute(session, value, field, typ, allowString=True, allowList=True):
    """ a validator to test a valid route. use with :func:`iro.validate.validate`. 

    :param session: a valid session object (is created by decorator :func:`iro.model.dbdefer.dbdefer`)
    :param value: the value to test
    :param string field: the field that is tested (only used to get a propper error message).
    :param string typ: a typ to test the route in
    :param boolean allowString: a single route is allowd.
    :param boolean allowList: a list of routes is allowed.
    :return: *value*, if value is a valid route for a given typ.
    :raises: :exc:`iro.error.ValidateException`
    """
    str_ = False
    ret = []

    if type(value) is types.StringType:
        if not allowString:
            raise ValidateException(field=field,msg='%s must be a list of routes.'%field)
        str_=True
        value=[value]
    elif not allowList:
        raise ValidateException(field=field,msg='%s must be a route - No list of routes.'%field)

    routes = [o.name for o in Offer.routes(session,typ)]
    providers =  [o.provider for o in Offer.providers(session,typ)]
    for v in value:
        if v not in routes and v not in providers and v != "default":
            raise ValidateException(field=field,msg='Route %s is not valid.'%v)
        if v not in ret:
            ret.append(v)
    if str_:
        return ret[0]
    return ret

@dbdefer
def vTyp(value,field, session):
    """ a validator to test a valid typ. use with :func:`iro.validate.validate`. 

    :param session: a valid session object (is created by decorator :func:`iro.model.dbdefer.dbdefer`)
    :param value: the value to test
    :param string field: the field that is tested (only used to get a propper error message).
    :return: *value*, if value is a valid typ.
    :raises: :exc:`iro.error.ValidateException`
    """

    for typ in Offer.typs(session):
        if value == typ[0]:
            break
    else:
        raise ValidateException(field=field,msg='Typ %s is not valid.'%value)
    return value