#!/usr/bin/python3
#
# GPOA - GPO Applier for Linux
#
# Copyright (C) 2019-2022 BaseALT Ltd.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import subprocess
import argparse
import os
from pathlib import Path

class Scripts_runner:
    '''
    A class for an object that iterates over directories with scripts
    in the desired sequence and launches them
    '''
    def __init__(self, work_mode = None,  user_name = None, action = None):
        self.dir_scripts_machine = '/var/cache/gpupdate_scripts_cache/machine/'
        self.dir_scripts_users = '/var/cache/gpupdate_scripts_cache/users/'
        self.user_name = user_name
        self.list_with_all_commands = list()
        stack_dir = None
        if work_mode and work_mode.upper() == 'MACHINE':
            stack_dir = self.machine_runner_fill()
        elif work_mode and work_mode.upper() == 'USER':
            stack_dir = self.user_runner_fill()
        else:
            print('Invalid arguments entered')
            return
        if action:
            self.action = action.upper()
        else:
            print('Action needed')
            return

        self.find_action(stack_dir)
        for it_cmd in self.list_with_all_commands:
            print(self.run_cmd_subprocess(it_cmd))

    def user_runner_fill(self):
        return self.get_stack_dir(self.dir_scripts_users + self.user_name)

    def machine_runner_fill(self):
        return self.get_stack_dir(self.dir_scripts_machine)

    def get_stack_dir(self, path_dir):
        stack_dir = list()
        try:
            dir_script = Path(path_dir)
            for it_dir in dir_script.iterdir():
                stack_dir.append(str(it_dir))
            return stack_dir
        except Exception as exc:
            print(exc)
            return None

    def find_action(self, stack_dir):
        if not stack_dir:
            return
        list_tmp = list()
        while stack_dir:
            path_turn = stack_dir.pop()
            basename = os.path.basename(path_turn)
            if basename == self.action:
                list_tmp = self.get_stack_dir(path_turn)
        if list_tmp:
            self.fill_list_cmd(list_tmp)


    def fill_list_cmd(self, list_tmp):
        list_tmp = sorted(list_tmp)
        for file_in_task_dir in list_tmp:
            suffix = os.path.basename(file_in_task_dir)[-4:]
            if suffix == '.arg':
                try:
                    arg = self.read_args(file_in_task_dir)
                    for it_arg in arg.split():
                        self.list_with_all_commands[-1].append(it_arg)
                except Exception as exc:
                    print('Argument read for {}: {}'.format(self.list_with_all_commands.pop(), exc))
            else:
                cmd = list()
                cmd.append(file_in_task_dir)
                self.list_with_all_commands.append(cmd)


    def read_args(self, path):
        with open(path + '/arg') as f:
            args = f.readlines()
        return args[0]

    def run_cmd_subprocess(self, cmd):
        try:
            subprocess.Popen(cmd)
            return 'Script run: {}'.format(cmd)
        except Exception as exc:
            return exc



if __name__ == '__main__':
    parser = argparse.ArgumentParser(description='Scripts runner')
    parser.add_argument('--mode', type = str, help = 'MACHINE or USER', nargs = '?', default = None)
    parser.add_argument('--user', type = str, help = 'User name ', nargs = '?', default = None)
    parser.add_argument('--action', type = str, help = 'MACHINE : [STARTUP or SHUTDOWN], USER : [LOGON or LOGOFF]', nargs = '?', default = None)

    args = parser.parse_args()
    try:
        Scripts_runner(args.mode, args.user, args.action)
    except Exception as exc:
        print(exc)