from sfa.util.method import Method
from sfa.util.sfalogging import logger

from sfa.trust.credential import Credential

from sfa.storage.parameter import Parameter


class Update(Method):
    """
    Update an object in the registry. Currently, this only updates the
    PLC information associated with the record. The SFA fields (name, type,
    GID) are fixed.

    @param cred credential string specifying rights of the caller
    @param record a record dictionary to be updated

    @return 1 if successful, faults otherwise
    """

    interfaces = ['registry']

    accepts = [
        Parameter(dict, "Record dictionary to be updated"),
        Parameter(str, "Credential string"),
    ]

    returns = Parameter(int, "1 if successful")

    def call(self, record_dict, creds):
        # validate the cred
        valid_creds = self.api.auth.checkCredentials(creds, "update")

        # verify permissions
        hrn = record_dict.get('hrn', '')
        self.api.auth.verify_object_permission(hrn)

        # log
        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, hrn, self.name))

        return self.api.manager.Update(self.api, record_dict)