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

# (c) 2020, Simon Dodsley (simon@purestorage.com)
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)

from __future__ import absolute_import, division, print_function
__metaclass__ = type

ANSIBLE_METADATA = {'metadata_version': '1.1',
                    'status': ['preview'],
                    'supported_by': 'community'}

DOCUMENTATION = r'''
---
module: purefa_export
version_added: '1.5.0'
short_description: Manage FlashArray File System Exports
description:
- Create/Delete FlashArray File Systems Exports
author:
- Pure Storage Ansible Team (@sdodsley) <pure-ansible-team@purestorage.com>
options:
  name:
    description:
    - Name of the export
    type: str
    required: true
  state:
    description:
    - Define whether the export should exist or not.
    - You must specify an NFS or SMB policy, or both on creation and deletion.
    default: present
    choices: [ absent, present ]
    type: str
  filesystem:
    description:
    - Name of the filesystem the export applies to
    type: str
    required: true
  directory:
    description:
    - Name of the managed directory in the file system the export applies to
    type: str
    required: true
  nfs_policy:
    description:
    - Name of NFS Policy to apply to the export
    type: str
  smb_policy:
    description:
    - Name of SMB Policy to apply to the export
    type: str
extends_documentation_fragment:
- purestorage.flasharray.purestorage.fa
'''

EXAMPLES = r'''
- name: Create NFS and SMB exports for directory foo in filesysten bar
  purefa_export:
    name: export1
    filesystem: bar
    directory: foo
    nfs_policy: nfs-example
    smb_polict: smb-example
    fa_url: 10.10.10.2
    api_token: e31060a7-21fc-e277-6240-25983c6c4592

- name: Delete NFS export for directory foo in filesystem bar
  purefa_export:
    name: export1
    filesystem: bar
    directory: foo
    nfs_policy: nfs-example
    state: absent
    fa_url: 10.10.10.2
    api_token: e31060a7-21fc-e277-6240-25983c6c4592
'''

RETURN = r'''
'''

HAS_PURESTORAGE = True
try:
    from pypureclient import flasharray
except ImportError:
    HAS_PURESTORAGE = False

from ansible.module_utils.basic import AnsibleModule
from ansible_collections.purestorage.flasharray.plugins.module_utils.purefa import get_system, get_array, purefa_argument_spec

MIN_REQUIRED_API_VERSION = '2.3'


def delete_export(module, array):
    """Delete a file system export"""
    changed = True
    if not module.check_mode:
        all_policies = []
        directory = module.params['filesystem'] + ":" + module.params['directory']
        if not module.params['nfs_policy'] and not module.params['smb_policy']:
            module.fail_json(msg="At least one policy must be provided")
        if module.params['nfs_policy']:
            policy_exists = bool(array.get_directory_exports(export_names=[module.params['name']],
                                                             policy_names=[module.params['nfs_policy']],
                                                             directory_names=[directory]).status_code == 200)
            if policy_exists:
                all_policies.append(module.params['nfs_policy'])
        if module.params['smb_policy']:
            policy_exists = bool(array.get_directory_exports(export_names=[module.params['name']],
                                                             policy_names=[module.params['smb_policy']],
                                                             directory_names=[directory]).status_code == 200)
            if policy_exists:
                all_policies.append(module.params['smb_policy'])
        if all_policies:
            res = array.delete_directory_exports(export_names=[module.params['name']], policy_names=all_policies)
            if res.status_code != 200:
                module.fail_json(msg="Failed to delete file system export {0}. {1}".format(module.params['name'],
                                                                                           res.errors[0].message))
        else:
            changed = False
    module.exit_json(changed=changed)


def create_export(module, array):
    """Create a file system export"""
    changed = True
    if not module.check_mode:
        changed = False
        if not module.params['nfs_policy'] and not module.params['smb_policy']:
            module.fail_json(msg="At least one policy must be provided")
        all_policies = []
        if module.params['nfs_policy']:
            if bool(array.get_policies_nfs(names=[module.params['nfs_policy']]).status_code != 200):
                module.fail_json(msg="NFS Policy {0} does not exist.".format(module.params['nfs_policy']))
            if bool(array.get_directory_exports(export_names=[module.params['name']], policy_names=[module.params['nfs_policy']]).status_code != 200):
                all_policies.append(module.params['nfs_policy'])
        if module.params['smb_policy']:
            if bool(array.get_policies_smb(names=[module.params['smb_policy']]).status_code != 200):
                module.fail_json(msg="SMB Policy {0} does not exist.".format(module.params['smb_policy']))
            if bool(array.get_directory_exports(export_names=[module.params['name']], policy_names=[module.params['smb_policy']]).status_code != 200):
                all_policies.append(module.params['smb_policy'])
        if all_policies:
            export = flasharray.DirectoryExportPost(export_name=module.params['name'])
            res = array.post_directory_exports(directory_names=[module.params['filesystem'] + ":" + module.params['directory']],
                                               exports=export,
                                               policy_names=all_policies)
            if res.sttaus_code == 200:
                changed = True
            else:
                module.fail_json(msg="Failed to create file system exports for {0}:{1}. Error: {2}".format(module.params['filesystem'],
                                                                                                           module.params['directory'],
                                                                                                           res.errors[0].message))
    module.exit_json(changed=changed)


def main():
    argument_spec = purefa_argument_spec()
    argument_spec.update(dict(
        state=dict(type='str', default='present', choices=['absent', 'present']),
        filesystem=dict(type='str', required=True),
        directory=dict(type='str', required=True),
        name=dict(type='str', required=True),
        nfs_policy=dict(type='str'),
        smb_policy=dict(type='str'),
    ))

    required_if = [['state', 'present', ['filesystem', 'directory']]]
    module = AnsibleModule(argument_spec,
                           required_if=required_if,
                           supports_check_mode=True)

    if not HAS_PURESTORAGE:
        module.fail_json(msg='py-pure-client sdk is required for this module')

    array = get_system(module)
    api_version = array._list_available_rest_versions()
    if MIN_REQUIRED_API_VERSION not in api_version:
        module.fail_json(msg='FlashArray REST version not supported. '
                             'Minimum version required: {0}'.format(MIN_REQUIRED_API_VERSION))
    array = get_array(module)
    state = module.params['state']

    exists = bool(array.get_directory_exports(export_names=[module.params['name']]).status_code == 200)

    if state == 'present':
        create_export(module, array)
    elif state == 'absent' and exists:
        delete_export(module, array)

    module.exit_json(changed=False)


if __name__ == '__main__':
    main()
