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"""Contains UI methods for Nginx operations."""
import logging

import zope.component

from certbot import interfaces

import certbot.display.util as display_util


logger = logging.getLogger(__name__)


def select_vhost_multiple(vhosts):
    """Select multiple Vhosts to install the certificate for
    :param vhosts: Available Nginx VirtualHosts
    :type vhosts: :class:`list` of type `~obj.Vhost`
    :returns: List of VirtualHosts
    :rtype: :class:`list`of type `~obj.Vhost`
    """
    if not vhosts:
        return list()
    tags_list = [vhost.display_repr()+"\n" for vhost in vhosts]
    # Remove the extra newline from the last entry
    if tags_list:
        tags_list[-1] = tags_list[-1][:-1]
    code, names = zope.component.getUtility(interfaces.IDisplay).checklist(
        "Which server blocks would you like to modify?",
        tags=tags_list, force_interactive=True)
    if code == display_util.OK:
        return_vhosts = _reversemap_vhosts(names, vhosts)
        return return_vhosts
    return []

def _reversemap_vhosts(names, vhosts):
    """Helper function for select_vhost_multiple for mapping string
    representations back to actual vhost objects"""
    return_vhosts = list()

    for selection in names:
        for vhost in vhosts:
            if vhost.display_repr().strip() == selection.strip():
                return_vhosts.append(vhost)
    return return_vhosts