# Copyright (c) 2015 SUSE Linux GmbH.  All rights reserved.
#
# This file is part of kiwi.
#
# kiwi 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.
#
# kiwi 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 kiwi.  If not, see <http://www.gnu.org/licenses/>
#
"""
usage: kiwi-ng system create -h | --help
       kiwi-ng system create --root=<directory> --target-dir=<directory>
           [--signing-key=<key-file>...]
       kiwi-ng system create help

commands:
    create
        create a system image from the specified root directory
        the root directory is the result of a system prepare
        command
    create help
        show manual page for create command

options:
    --root=<directory>
        the path to the root directory, usually the result of
        a former system prepare call
    --target-dir=<directory>
        the target directory to store the system image file(s)
    --signing-key=<key-file>
        includes the key-file as a trusted key for package manager validations
"""
import os
import logging

# project
from kiwi.tasks.base import CliTask
from kiwi.help import Help
from kiwi.builder import ImageBuilder
from kiwi.system.setup import SystemSetup
from kiwi.privileges import Privileges
from kiwi.path import Path

log = logging.getLogger('kiwi')


class SystemCreateTask(CliTask):
    """
    Implements creation of system images

    Attributes

    * :attr:`manual`
        Instance of Help
    """
    def process(self):
        """
        Create a system image from the specified root directory
        the root directory is the result of a system prepare
        command
        """
        self.manual = Help()
        if self._help():
            return

        Privileges.check_for_root_permissions()

        abs_target_dir_path = os.path.abspath(
            self.command_args['--target-dir']
        )
        abs_root_path = os.path.abspath(self.command_args['--root'])

        self.load_xml_description(
            abs_root_path, self.global_args['--kiwi-file']
        )

        self.run_checks(
            {
                'check_target_directory_not_in_shared_cache':
                    [abs_root_path],
                'check_dracut_module_versions_compatible_to_kiwi':
                    [abs_root_path],
                'check_target_dir_on_unsupported_filesystem':
                    [abs_root_path]
            }
        )

        log.info('Creating system image')
        if not os.path.exists(abs_target_dir_path):
            Path.create(abs_target_dir_path)

        setup = SystemSetup(
            xml_state=self.xml_state,
            root_dir=abs_root_path
        )
        setup.call_image_script()

        image_builder = ImageBuilder.new(
            self.xml_state,
            abs_target_dir_path,
            abs_root_path,
            custom_args={
                'signing_keys': self.command_args['--signing-key'],
                'xz_options': self.runtime_config.get_xz_options()
            }
        )
        result = image_builder.create()
        result.print_results()
        result.dump(
            os.sep.join([abs_target_dir_path, 'kiwi.result'])
        )

    def _help(self):
        if self.command_args['help']:
            self.manual.show('kiwi::system::create')
        else:
            return False
        return self.manual
