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#!/opt/cloudlinux/venv/bin/python3 -bb
# -*- coding: utf-8 -*-

# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2019 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENSE.TXT

# check /var/lve/PANEL
# if FILE absent - create
# if FILE empty - work as if FILE absent
# read panel name from FILE
# if panel name changed = check panel process end and reinstall lvemanager cagefs lve-utils
import argparse
import logging
import os
import sys
from logging.handlers import RotatingFileHandler
from subprocess import CalledProcessError, check_output

from clcommon.const import Feature
from clcommon.cpapi import is_panel_feature_supported
from clcommon.utils import is_ubuntu, run_command
from cldetectlib import getCPName

PANEL_FILE_DIR = '/var/lve'
PANEL_FILE = os.path.join(PANEL_FILE_DIR, 'PANEL')
LOG = '/var/log/package_reinstaller.log'


def is_panel_change():
    """
    :return: True if names are different and new panel name
    """
    panel_name = getCPName()
    logging.info('Current panel is %s', panel_name)
    try:
        with open(PANEL_FILE, encoding="utf-8") as f:
            old_panel_name = f.read()
        logging.info('Old panel is %s', old_panel_name)
        if old_panel_name != panel_name:
            return True, panel_name
        return False, panel_name
    except (OSError, IOError) as e:
        # if the file doesn't exist - panel doesn't change
        logging.warning('Panel file %s not found!, error: %s', PANEL_FILE, str(e))
        return False, panel_name


def write_panel_file(panel_name):
    """
    Save the given panel name to /var/lve/PANEL.

    :param panel_name: The panel name to save.
    :type panel_name: str
    """
    try:
        os.mkdir(PANEL_FILE_DIR)
    except OSError:
        pass  # directory already exists
    with open(PANEL_FILE, 'w', encoding="utf8") as f:
        f.write(panel_name)


def is_panel_process_active(panel_name):
    """
    :param panel_name:
    :return: True if panel is already detected but not installed yet
    """
    process_active = False
    if panel_name == 'cPanel':
        # Expect installation in progress if installer.lock file present
        process_active = os.path.isfile('/root/installer.lock')
    elif panel_name == 'Plesk':
        process_active = True
        not_running_pattern = 'Plesk Installer is not running'
        plesk_bin = '/usr/sbin/plesk'
        # Plesk is installing if we detect it and plesk bin doesn't exist
        if not os.path.exists(plesk_bin):
            return process_active
        try:
            result = check_output(
                [
                    plesk_bin,
                    'installer',
                    '--query-status',
                ],
                text=True,
            )
            process_active = not_running_pattern not in result
        except (CalledProcessError, FileNotFoundError):
            return process_active
    elif panel_name == 'DirectAdmin':
        # Location changed in DirectAdmin 1.659
        # https://docs.directadmin.com/changelog/version-1.659.html#migrate-scripts-setup-txt-to-conf-setup-txt
        new_da_setup_txt = '/usr/local/directadmin/conf/setup.txt'
        old_da_setup_txt = '/usr/local/directadmin/scripts/setup.txt'
        process_active = not os.path.exists(old_da_setup_txt) and not os.path.exists(new_da_setup_txt)

    return process_active


def packages_to_reinstall():
    """
    Gather packages to reinstall depending on the features supported by the panel.

    :return: List of package names.
    :rtype: list[str]
    """
    packages = ['lvemanager', 'lve-utils', 'alt-python27-cllib']
    if is_panel_feature_supported(Feature.CAGEFS):
        packages.append('cagefs')
    if is_panel_feature_supported(Feature.XRAY):
        packages.append("lvemanager-xray")
    if is_panel_feature_supported(Feature.WPOS):
        packages.append("cloudlinux-awp-plugin")
    return packages


def package_reinstall_apt(pkgs):
    """
    Invokes the package reinstallation command with apt.
    """
    cmd_env = os.environ.copy()
    # For debconf to avoid making any interactive queries.
    cmd_env['DEBIAN_FRONTEND'] = 'noninteractive'
    cmd_env['DEBCONF_NONINTERACTIVE_SEEN'] = 'true'

    return run_command(
        ['/usr/bin/apt-get', 'install', '--reinstall', '--yes'] + pkgs,
        env_data=cmd_env,
        return_full_output=True,
    )


def package_reinstall_yum(pkgs):
    """
    Invokes the package reinstallation command with yum.
    """
    return run_command(
        ['/usr/bin/yum', 'reinstall', '-y'] + pkgs,
        return_full_output=True,
    )


def perform_package_reinstallation():
    """
    Perform the actuall package reinstallation, invoking the package manager.
    Uses apt-get on Ubuntu-based machines, and yum otherwise.

    :return: Tuple of (return code, stdout, stderr)
    :rtype: tuple[int, str, str]
    """
    to_reinstall = packages_to_reinstall()
    if is_ubuntu():
        return package_reinstall_apt(to_reinstall)
    return package_reinstall_yum(to_reinstall)


def check():
    """
    Check if control panel name equals to the cached one
    and reinstall packages if not so
    :return: None
    """
    (panel_changed, new_panel_name) = is_panel_change()
    if not panel_changed:
        logging.warning('The panel was not changed, skipping package reinstallation')
        return

    logging.info('The control panel has changed, reinstalling packages')

    if new_panel_name in ['cPanel', 'Plesk', 'DirectAdmin']:
        if not is_panel_process_active(new_panel_name):
            retcode, std_out, std_err = perform_package_reinstallation()
            if retcode == 0 or (retcode == 1 and std_err.find('Nothing to do')):
                write_panel_file(new_panel_name)
            logging.info(
                'Packages have been reinstalled!\nSTDOUT: \n%s\nSTDERR: \n%s\n',
                std_out,
                std_err,
            )
        else:
            logging.warning(
                'The panel is currently being installed, skipping package reinstallation!'
            )
    else:
        write_panel_file(new_panel_name)


def init():
    """
    Save the current control panel name to cache if it's not saved yet.
    :return: None
    """
    if not os.path.exists(PANEL_FILE):
        write_panel_file(getCPName())


if __name__ == '__main__':
    logging.basicConfig(
        handlers=[RotatingFileHandler(LOG, maxBytes=1024 * 1024, backupCount=2)],
        level=logging.INFO,
        format='%(asctime)s %(levelname)s:%(name)s:%(message)s',
    )

    parser = argparse.ArgumentParser()

    subparsers = parser.add_subparsers(dest='subparser')
    subparsers.add_parser(
        'init',
        help="Init the panel name cache file; "
        f"works only once and creates the {PANEL_FILE} file",
    )
    subparsers.add_parser(
        'check',
        help="Check for control panel change; "
        "Reinstall packages if control panel name doesn't match the one in the cache file.",
    )
    args = parser.parse_args()

    if args.subparser == 'init':
        init()
    elif args.subparser == 'check':
        check()
    else:
        parser.print_help()
        # print(f'Command {args.subparser} is not implemented')
        sys.exit(1)