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

from sfa.storage.parameter import Parameter, Mixed
from sfa.trust.auth import Auth
from sfa.trust.credential import Credential


class Delete(Method):
    """
    Remove the slice or slivers and free the allocated resources

    @param xrns human readable name of slice to instantiate (hrn or urn)
    @param creds credential string specifying the rights of the caller
    @return 1 is successful, faults otherwise
    """

    interfaces = ['aggregate']

    accepts = [
        Parameter(
            type([str]), "Human readable name of slice to delete (hrn or urn)"),
        Parameter(type([dict]), "Credentials"),
        Parameter(dict, "options"),
    ]

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

    def call(self, xrns, creds, options):
        valid_creds = self.api.auth.checkCredentialsSpeaksFor(
            creds, 'deletesliver', xrns,
            check_sliver_callback=self.api.driver.check_sliver_credentials,
            options=options)

        # log the call
        origin_hrn = Credential(cred=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, xrns, self.name))

        return self.api.manager.Delete(self.api, xrns, creds, options)