"""The key email command."""

from mailman.interfaces.command import ContinueProcessing, IEmailCommand
from public import public
from zope.interface import implementer


@public
@implementer(IEmailCommand)
class KeyCommand:
    name = 'key'
    argument_description = '<change|revoke|sign>'
    short_description = ''
    description = ''

    def process(mlist, msg, msgdata, arguments, results):
        """See `IEmailCommand`."""
        if len(arguments) == 0:
            print('No sub-command specified,'
                  ' must be one of <change|revoke|sign>.', file=results)
            return ContinueProcessing.no
        if arguments[0] == 'change':
            # New public key in attachment, requires to be signed with current
            # key
            pass
        elif arguments[0] == 'revoke':
            # Current key revocation certificate in attachment, restarts the
            # subscription process, or rather only it's key setup part.
            pass
        elif arguments[0] == 'sign':
            # List public key attached, signed by the users current key.
            pass
        else:
            print('Wrong sub-command specified,'
                  ' must be one of <change|revoke|sign>.', file=results)
            return ContinueProcessing.no