#!/usr/bin/python
# -*- coding: utf-8 -*-

# Copyright (c) 2020, Ansible Project
# Copyright (c) 2020, VMware, Inc. All Rights Reserved.
# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
# SPDX-License-Identifier: GPL-3.0-or-later

from __future__ import absolute_import, division, print_function
__metaclass__ = type

DOCUMENTATION = r'''
---
module: iso_create
short_description: Generate ISO file with specified files or folders
description:
  - This module is used to generate ISO file with specified path of files.
author:
  - Diane Wang (@Tomorrow9) <dianew@vmware.com>
requirements:
  - "pycdlib"
version_added: '0.2.0'

extends_documentation_fragment:
  - community.general.attributes

attributes:
  check_mode:
    support: full
  diff_mode:
    support: none

options:
   src_files:
     description:
     - This is a list of absolute paths of source files or folders which will be contained in the new generated ISO file.
     - Will fail if specified file or folder in O(src_files) does not exist on local machine.
     - 'Note: With all ISO9660 levels from 1 to 3, all file names are restricted to uppercase letters, numbers and
       underscores (_). File names are limited to 31 characters, directory nesting is limited to 8 levels, and path
       names are limited to 255 characters.'
     type: list
     required: true
     elements: path
   dest_iso:
     description:
     - The absolute path with file name of the new generated ISO file on local machine.
     - Will create intermediate folders when they does not exist.
     type: path
     required: true
   interchange_level:
     description:
     - The ISO9660 interchange level to use, it dictates the rules on the names of files.
     - Levels and valid values V(1), V(2), V(3), V(4) are supported.
     - The default value is level V(1), which is the most conservative, level V(3) is recommended.
     - ISO9660 file names at interchange level V(1) cannot have more than 8 characters or 3 characters in the extension.
     type: int
     default: 1
     choices: [1, 2, 3, 4]
   vol_ident:
     description:
     - The volume identification string to use on the new generated ISO image.
     type: str
   rock_ridge:
     description:
     - Whether to make this ISO have the Rock Ridge extensions or not.
     - Valid values are V(1.09), V(1.10) or V(1.12), means adding the specified Rock Ridge version to the ISO.
     - If unsure, set V(1.09) to ensure maximum compatibility.
     - If not specified, then not add Rock Ridge extension to the ISO.
     type: str
     choices: ['1.09', '1.10', '1.12']
   joliet:
     description:
     - Support levels and valid values are V(1), V(2), or V(3).
     - Level V(3) is by far the most common.
     - If not specified, then no Joliet support is added.
     type: int
     choices: [1, 2, 3]
   udf:
     description:
     - Whether to add UDF support to this ISO.
     - If set to V(true), then version 2.60 of the UDF spec is used.
     - If not specified or set to V(false), then no UDF support is added.
     type: bool
     default: false
'''

EXAMPLES = r'''
- name: Create an ISO file
  community.general.iso_create:
    src_files:
      - /root/testfile.yml
      - /root/testfolder
    dest_iso: /tmp/test.iso
    interchange_level: 3

- name: Create an ISO file with Rock Ridge extension
  community.general.iso_create:
    src_files:
      - /root/testfile.yml
      - /root/testfolder
    dest_iso: /tmp/test.iso
    rock_ridge: 1.09

- name: Create an ISO file with Joliet support
  community.general.iso_create:
    src_files:
      - ./windows_config/Autounattend.xml
    dest_iso: ./test.iso
    interchange_level: 3
    joliet: 3
    vol_ident: WIN_AUTOINSTALL
'''

RETURN = r'''
source_file:
    description: Configured source files or directories list.
    returned: on success
    type: list
    elements: path
    sample: ["/path/to/file.txt", "/path/to/folder"]
created_iso:
    description: Created iso file path.
    returned: on success
    type: str
    sample: "/path/to/test.iso"
interchange_level:
    description: Configured interchange level.
    returned: on success
    type: int
    sample: 3
vol_ident:
    description: Configured volume identification string.
    returned: on success
    type: str
    sample: "OEMDRV"
joliet:
    description: Configured Joliet support level.
    returned: on success
    type: int
    sample: 3
rock_ridge:
    description: Configured Rock Ridge version.
    returned: on success
    type: str
    sample: "1.09"
udf:
    description: Configured UDF support.
    returned: on success
    type: bool
    sample: false
'''

import os
import traceback

PYCDLIB_IMP_ERR = None
try:
    import pycdlib
    HAS_PYCDLIB = True
except ImportError:
    PYCDLIB_IMP_ERR = traceback.format_exc()
    HAS_PYCDLIB = False

from ansible.module_utils.basic import AnsibleModule, missing_required_lib
from ansible.module_utils.common.text.converters import to_native


def add_file(module, iso_file=None, src_file=None, file_path=None, rock_ridge=None, use_joliet=None, use_udf=None):
    rr_name = None
    joliet_path = None
    udf_path = None
    # In standard ISO interchange level 1, file names have a maximum of 8 characters, followed by a required dot,
    # followed by a maximum 3 character extension, followed by a semicolon and a version
    file_name = os.path.basename(file_path)
    if '.' not in file_name:
        file_in_iso_path = file_path.upper() + '.;1'
    else:
        file_in_iso_path = file_path.upper() + ';1'
    if rock_ridge:
        rr_name = file_name
    if use_joliet:
        joliet_path = file_path
    if use_udf:
        udf_path = file_path
    try:
        iso_file.add_file(src_file, iso_path=file_in_iso_path, rr_name=rr_name, joliet_path=joliet_path, udf_path=udf_path)
    except Exception as err:
        module.fail_json(msg="Failed to add file %s to ISO file due to %s" % (src_file, to_native(err)))


def add_directory(module, iso_file=None, dir_path=None, rock_ridge=None, use_joliet=None, use_udf=None):
    rr_name = None
    joliet_path = None
    udf_path = None
    iso_dir_path = dir_path.upper()
    if rock_ridge:
        rr_name = os.path.basename(dir_path)
    if use_joliet:
        joliet_path = dir_path
    if use_udf:
        udf_path = dir_path
    try:
        iso_file.add_directory(iso_path=iso_dir_path, rr_name=rr_name, joliet_path=joliet_path, udf_path=udf_path)
    except Exception as err:
        module.fail_json(msg="Failed to directory %s to ISO file due to %s" % (dir_path, to_native(err)))


def main():
    argument_spec = dict(
        src_files=dict(type='list', required=True, elements='path'),
        dest_iso=dict(type='path', required=True),
        interchange_level=dict(type='int', choices=[1, 2, 3, 4], default=1),
        vol_ident=dict(type='str'),
        rock_ridge=dict(type='str', choices=['1.09', '1.10', '1.12']),
        joliet=dict(type='int', choices=[1, 2, 3]),
        udf=dict(type='bool', default=False),
    )
    module = AnsibleModule(
        argument_spec=argument_spec,
        supports_check_mode=True,
    )
    if not HAS_PYCDLIB:
        module.fail_json(missing_required_lib('pycdlib'), exception=PYCDLIB_IMP_ERR)

    src_file_list = module.params.get('src_files')
    if src_file_list and len(src_file_list) == 0:
        module.fail_json(msg='Please specify source file and/or directory list using src_files parameter.')
    for src_file in src_file_list:
        if not os.path.exists(src_file):
            module.fail_json(msg="Specified source file/directory path does not exist on local machine, %s" % src_file)

    dest_iso = module.params.get('dest_iso')
    if dest_iso and len(dest_iso) == 0:
        module.fail_json(msg='Please specify the absolute path of the new created ISO file using dest_iso parameter.')

    dest_iso_dir = os.path.dirname(dest_iso)
    if dest_iso_dir and not os.path.exists(dest_iso_dir):
        # will create intermediate dir for new ISO file
        try:
            os.makedirs(dest_iso_dir)
        except OSError as err:
            module.fail_json(msg='Exception caught when creating folder %s, with error %s' % (dest_iso_dir, to_native(err)))

    volume_id = module.params.get('vol_ident')
    if volume_id is None:
        volume_id = ''
    inter_level = module.params.get('interchange_level')
    rock_ridge = module.params.get('rock_ridge')
    use_joliet = module.params.get('joliet')
    use_udf = None
    if module.params['udf']:
        use_udf = '2.60'

    result = dict(
        changed=False,
        source_file=src_file_list,
        created_iso=dest_iso,
        interchange_level=inter_level,
        vol_ident=volume_id,
        rock_ridge=rock_ridge,
        joliet=use_joliet,
        udf=use_udf
    )
    if not module.check_mode:
        iso_file = pycdlib.PyCdlib(always_consistent=True)
        iso_file.new(interchange_level=inter_level, vol_ident=volume_id, rock_ridge=rock_ridge, joliet=use_joliet, udf=use_udf)

        for src_file in src_file_list:
            # if specify a dir then go through the dir to add files and dirs
            if os.path.isdir(src_file):
                dir_list = []
                file_list = []
                src_file = src_file.rstrip('/')
                dir_name = os.path.basename(src_file)
                add_directory(module, iso_file=iso_file, dir_path='/' + dir_name, rock_ridge=rock_ridge,
                              use_joliet=use_joliet, use_udf=use_udf)

                # get dir list and file list
                for path, dirs, files in os.walk(src_file):
                    for filename in files:
                        file_list.append(os.path.join(path, filename))
                    for dir in dirs:
                        dir_list.append(os.path.join(path, dir))
                for new_dir in dir_list:
                    add_directory(module, iso_file=iso_file, dir_path=new_dir.split(os.path.dirname(src_file))[1],
                                  rock_ridge=rock_ridge, use_joliet=use_joliet, use_udf=use_udf)
                for new_file in file_list:
                    add_file(module, iso_file=iso_file, src_file=new_file,
                             file_path=new_file.split(os.path.dirname(src_file))[1], rock_ridge=rock_ridge,
                             use_joliet=use_joliet, use_udf=use_udf)
            # if specify a file then add this file directly to the '/' path in ISO
            else:
                add_file(module, iso_file=iso_file, src_file=src_file, file_path='/' + os.path.basename(src_file),
                         rock_ridge=rock_ridge, use_joliet=use_joliet, use_udf=use_udf)

        iso_file.write(dest_iso)
        iso_file.close()

    result['changed'] = True
    module.exit_json(**result)


if __name__ == '__main__':
    main()