# Copyright 2024 VyOS maintainers and contributors <maintainers@vyos.io>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
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# along with this library.  If not, see <http://www.gnu.org/licenses/>.

# T5886: Add support for ACME protocol (LetsEncrypt), migrate https certbot
#        to new "pki certificate" CLI tree
# T5902: Remove virtual-host

import os

from vyos.configtree import ConfigTree
from vyos.defaults import directories
from vyos.utils.process import cmd

vyos_certbot_dir = directories['certbot']

base = ['service', 'https']

def migrate(config: ConfigTree) -> None:
    if not config.exists(base):
        # Nothing to do
        return

    if config.exists(base + ['certificates', 'certbot']):
        # both domain-name and email must be set on CLI - ensured by previous verify()
        domain_names = config.return_values(base + ['certificates', 'certbot', 'domain-name'])
        email = config.return_value(base + ['certificates', 'certbot', 'email'])
        config.delete(base + ['certificates', 'certbot'])

        # Set default certname based on domain-name
        cert_name = 'https-' + domain_names[0].split('.')[0]
        # Overwrite certname from previous certbot calls if available
        # We can not use python code like os.scandir due to filesystem permissions.
        # This must be run as root
        certbot_live = f'{vyos_certbot_dir}/live/' # we need the trailing /
        if os.path.exists(certbot_live):
            tmp = cmd(f'sudo find {certbot_live} -maxdepth 1 -type d')
            tmp = tmp.split() # tmp = ['/config/auth/letsencrypt/live', '/config/auth/letsencrypt/live/router.vyos.net']
            tmp.remove(certbot_live)
            cert_name = tmp[0].replace(certbot_live, '')

        config.set(['pki', 'certificate', cert_name, 'acme', 'email'], value=email)
        config.set_tag(['pki', 'certificate'])
        for domain in domain_names:
            config.set(['pki', 'certificate', cert_name, 'acme', 'domain-name'], value=domain, replace=False)

        # Update Webserver certificate
        config.set(base + ['certificates', 'certificate'], value=cert_name)

    if config.exists(base + ['virtual-host']):
        allow_client = []
        listen_port = []
        listen_address = []
        for virtual_host in config.list_nodes(base + ['virtual-host']):
            allow_path = base + ['virtual-host', virtual_host, 'allow-client', 'address']
            if config.exists(allow_path):
                tmp = config.return_values(allow_path)
                allow_client.extend(tmp)

            port_path = base + ['virtual-host', virtual_host, 'port']
            if config.exists(port_path):
                tmp = config.return_value(port_path)
                listen_port.append(tmp)

            listen_address_path = base + ['virtual-host', virtual_host, 'listen-address']
            if config.exists(listen_address_path):
                tmp = config.return_value(listen_address_path)
                listen_address.append(tmp)

        config.delete(base + ['virtual-host'])
        for client in allow_client:
            config.set(base + ['allow-client', 'address'], value=client, replace=False)

        #  clear listen-address if "all" were specified
        if '*' in listen_address:
            listen_address = []
        for address in listen_address:
            config.set(base + ['listen-address'], value=address, replace=False)