from sfa.util.xrn import Xrn, urn_to_hrn
from sfa.util.method import Method
from sfa.util.sfalogging import logger

from sfa.trust.credential import Credential

from sfa.storage.parameter import Parameter, Mixed


class Resolve(Method):
    """
    Resolve a record.

    @param cred credential string authorizing the caller
    @param hrn human readable name to resolve (hrn or urn)
    @return a list of record dictionaries or empty list
    """

    interfaces = ['registry']

    # should we not accept an optional 'details' argument ?
    accepts = [
        Mixed(Parameter(str, "Human readable name (hrn or urn)"),
              Parameter(list, "List of Human readable names ([hrn])")),
        Mixed(Parameter(str, "Credential string"),
              Parameter(list, "List of credentials)")),
        Parameter(dict, "options"),
    ]

    # xxx used to be [SfaRecord]
    returns = [Parameter(dict, "registry record")]

    def call(self, xrns, creds, options=None):
        if options is None:
            options = {}
        # use details=False by default, only when explicitly specified do we want
        # to mess with the testbed details
        if 'details' in options:
            details = options['details']
        else:
            details = False
        type = None
        if not isinstance(xrns, list):
            type = Xrn(xrns).get_type()
            xrns = [xrns]
        hrns = [urn_to_hrn(xrn)[0] for xrn in xrns]
        # find valid credentials
        valid_creds = self.api.auth.checkCredentials(creds, 'resolve')

        # log the call
        origin_hrn = Credential(
            string=valid_creds[0]).get_gid_caller().get_hrn()
        logger.info("interface: %s\tcaller-hrn: %s\ttarget-hrn: %s\tmethod-name: %s" %
                    (self.api.interface, origin_hrn, hrns, self.name))

        # send the call to the right manager
        return self.api.manager.Resolve(self.api, xrns, type, details=details)