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

# Copyright: (c) 2017, 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_host
version_added: '2.4'
short_description: Manage hosts on Pure Storage FlashArrays
description:
- Create, delete or modify hosts on Pure Storage FlashArrays.
author:
- Pure Storage Ansible Team (@sdodsley) <pure-ansible-team@purestorage.com>
notes:
- If specifying C(lun) option ensure host support requested value
options:
  host:
    description:
    - The name of the host.
    type: str
    required: true
  state:
    description:
    - Define whether the host should exist or not.
    - When removing host all connected volumes will be disconnected.
    type: str
    default: present
    choices: [ absent, present ]
  protocol:
    description:
    - Defines the host connection protocol for volumes.
    type: str
    default: iscsi
    choices: [ fc, iscsi, nvme, mixed ]
  wwns:
    type: list
    description:
    - List of wwns of the host if protocol is fc or mixed.
  iqn:
    type: list
    description:
    - List of IQNs of the host if protocol is iscsi or mixed.
  nqn:
    type: list
    description:
    - List of NQNs of the host if protocol is nvme or mixed.
    version_added: '2.8'
  volume:
    type: str
    description:
    - Volume name to map to the host.
  lun:
    description:
    - LUN ID to assign to volume for host. Must be unique.
    - If not provided the ID will be automatically assigned.
    - Range for LUN ID is 1 to 4095.
    type: int
    version_added: '2.8'
  personality:
    type: str
    description:
    - Define which operating system the host is. Recommend for
      ActiveCluster integration.
    default: ''
    choices: ['hpux', 'vms', 'aix', 'esxi', 'solaris', 'hitachi-vsp', 'oracle-vm-server', 'delete', '']
    version_added: '2.7'
extends_documentation_fragment:
- purestorage.fa
'''

EXAMPLES = r'''
- name: Create new AIX host
  purefa_host:
    host: foo
    personaility: aix
    fa_url: 10.10.10.2
    api_token: e31060a7-21fc-e277-6240-25983c6c4592

- name: Delete host
  purefa_host:
    host: foo
    fa_url: 10.10.10.2
    api_token: e31060a7-21fc-e277-6240-25983c6c4592
    state: absent

- name: Make host bar with wwn ports
  purefa_host:
    host: bar
    protocol: fc
    wwns:
    - 00:00:00:00:00:00:00
    - 11:11:11:11:11:11:11
    fa_url: 10.10.10.2
    api_token: e31060a7-21fc-e277-6240-25983c6c4592

- name: Make host bar with iSCSI ports
  purefa_host:
    host: bar
    protocol: iscsi
    iqn:
    - iqn.1994-05.com.redhat:7d366003913
    fa_url: 10.10.10.2
    api_token: e31060a7-21fc-e277-6240-25983c6c4592

- name: Make host bar with NVMe ports
  purefa_host:
    host: bar
    protocol: nvme
    nqn:
    - nqn.2014-08.com.vendor:nvme:nvm-subsystem-sn-d78432
    fa_url: 10.10.10.2
    api_token: e31060a7-21fc-e277-6240-25983c6c4592

- name: Make mixed protocol host
  purefa_host:
    host: bar
    protocol: mixed
    nqn:
    - nqn.2014-08.com.vendor:nvme:nvm-subsystem-sn-d78432
    iqn:
    - iqn.1994-05.com.redhat:7d366003914
    wwns:
    - 00:00:00:00:00:00:01
    - 11:11:11:11:11:11:12
    fa_url: 10.10.10.2
    api_token: e31060a7-21fc-e277-6240-25983c6c4592

- name: Map host foo to volume bar as LUN ID 12
  purefa_host:
    host: foo
    volume: bar
    lun: 12
    fa_url: 10.10.10.2
    api_token: e31060a7-21fc-e277-6240-25983c6c4592
'''

RETURN = r'''
'''

from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.pure import get_system, purefa_argument_spec


AC_REQUIRED_API_VERSION = '1.14'
NVME_API_VERSION = '1.16'


try:
    from purestorage import purestorage
    HAS_PURESTORAGE = True
except ImportError:
    HAS_PURESTORAGE = False


def _set_host_initiators(module, array):
    """Set host initiators."""
    if module.params['protocol'] in ['nvme', 'mixed']:
        if module.params['nqn']:
            try:
                array.set_host(module.params['host'],
                               nqnlist=module.params['nqn'])
            except Exception:
                module.fail_json(msg='Setting of NVMe NQN failed.')
    if module.params['protocol'] in ['iscsi', 'mixed']:
        if module.params['iqn']:
            try:
                array.set_host(module.params['host'],
                               iqnlist=module.params['iqn'])
            except Exception:
                module.fail_json(msg='Setting of iSCSI IQN failed.')
    if module.params['protocol'] in ['fc', 'mixed']:
        if module.params['wwns']:
            try:
                array.set_host(module.params['host'],
                               wwnlist=module.params['wwns'])
            except Exception:
                module.fail_json(msg='Setting of FC WWNs failed.')


def _update_host_initiators(module, array):
    """Change host initiator if iscsi or nvme or add new FC WWNs"""
    if module.params['protocol'] in ['nvme', 'mixed']:
        if module.params['nqn']:
            try:
                array.set_host(module.params['host'],
                               nqnlist=module.params['nqn'])
            except Exception:
                module.fail_json(msg='Change of NVMe NQN failed.')
    if module.params['protocol'] in ['iscsi', 'mixed']:
        if module.params['iqn']:
            try:
                array.set_host(module.params['host'],
                               iqnlist=module.params['iqn'])
            except Exception:
                module.fail_json(msg='Change of iSCSI IQN failed.')
    if module.params['protocol'] in ['fc', 'mixed']:
        if module.params['wwns']:
            try:
                array.set_host(module.params['host'],
                               addwwnlist=module.params['wwns'])
            except Exception:
                module.fail_json(msg='FC WWN additiona failed.')


def _connect_new_volume(module, array, answer=False):
    """Connect volume to host"""
    api_version = array._list_available_rest_versions()
    if AC_REQUIRED_API_VERSION in api_version and module.params['lun']:
        try:
            array.connect_host(module.params['host'],
                               module.params['volume'],
                               lun=module.params['lun'])
            answer = True
        except Exception:
            module.fail_json(msg='LUN ID {0} invalid. Check for duplicate LUN IDs.'.format(module.params['lun']))
    else:
        array.connect_host(module.params['host'], module.params['volume'])
        answer = True
    return answer


def _set_host_personality(module, array):
    """Set host personality. Only called when supported"""
    if module.params['personality'] != 'delete':
        array.set_host(module.params['host'],
                       personality=module.params['personality'])
    else:
        array.set_host(module.params['host'], personality='')


def _update_host_personality(module, array, answer=False):
    """Change host personality. Only called when supported"""
    personality = array.get_host(module.params['host'], personality=True)['personality']
    if personality is None and module.params['personality'] != 'delete':
        array.set_host(module.params['host'],
                       personality=module.params['personality'])
        answer = True
    if personality is not None:
        if module.params['personality'] == 'delete':
            array.set_host(module.params['host'], personality='')
            answer = True
        elif personality != module.params['personality']:
            array.set_host(module.params['host'],
                           personality=module.params['personality'])
            answer = True
    return answer


def get_host(module, array):
    host = None
    for hst in array.list_hosts():
        if hst["name"] == module.params['host']:
            host = hst
            break
    return host


def make_host(module, array):
    changed = False
    try:
        array.create_host(module.params['host'])
        changed = True
    except Exception:
        module.fail_json(msg='Host {0} creation failed.'.format(module.params['host']))
    try:
        _set_host_initiators(module, array)
        api_version = array._list_available_rest_versions()
        if AC_REQUIRED_API_VERSION in api_version and module.params['personality']:
            _set_host_personality(module, array)
        if module.params['volume']:
            if module.params['lun']:
                array.connect_host(module.params['host'],
                                   module.params['volume'],
                                   lun=module.params['lun'])
            else:
                array.connect_host(module.params['host'], module.params['volume'])
    except Exception:
        module.fail_json(msg='Host {0} configuration failed.'.format(module.params['host']))
    module.exit_json(changed=changed)


def update_host(module, array):
    changed = False
    volumes = array.list_host_connections(module.params['host'])
    if module.params['iqn'] or module.params['wwns']:
        _update_host_initiators(module, array)
        changed = True
    if module.params['volume']:
        current_vols = [vol['vol'] for vol in volumes]
        if not module.params['volume'] in current_vols:
            changed = _connect_new_volume(module, array)
    api_version = array._list_available_rest_versions()
    if AC_REQUIRED_API_VERSION in api_version:
        if module.params['personality']:
            changed = _update_host_personality(module, array)
    module.exit_json(changed=changed)


def delete_host(module, array):
    changed = False
    try:
        for vol in array.list_host_connections(module.params['host']):
            array.disconnect_host(module.params['host'], vol["vol"])
        array.delete_host(module.params['host'])
        changed = True
    except Exception:
        module.fail_json(msg='Host {0} deletion failed'.format(module.params['host']))
    module.exit_json(changed=changed)


def main():
    argument_spec = purefa_argument_spec()
    argument_spec.update(dict(
        host=dict(type='str', required=True),
        state=dict(type='str', default='present', choices=['absent', 'present']),
        protocol=dict(type='str', default='iscsi', choices=['fc', 'iscsi', 'nvme', 'mixed']),
        nqn=dict(type='list'),
        iqn=dict(type='list'),
        wwns=dict(type='list'),
        volume=dict(type='str'),
        lun=dict(type='int'),
        personality=dict(type='str', default='',
                         choices=['hpux', 'vms', 'aix', 'esxi', 'solaris',
                                  'hitachi-vsp', 'oracle-vm-server', 'delete', '']),
    ))

    module = AnsibleModule(argument_spec, supports_check_mode=False)

    if not HAS_PURESTORAGE:
        module.fail_json(msg='purestorage sdk is required for this module in host')

    array = get_system(module)
    api_version = array._list_available_rest_versions()
    if module.params['nqn'] is not None and NVME_API_VERSION not in api_version:
        module.fail_json(msg='NVMe protocol not supported. Please upgrade your array.')
    state = module.params['state']
    host = get_host(module, array)
    if module.params['lun'] and not 1 <= module.params['lun'] <= 4095:
        module.fail_json(msg='LUN ID of {0} is out of range (1 to 4095)'.format(module.params['lun']))
    if module.params['volume']:
        try:
            array.get_volume(module.params['volume'])
        except Exception:
            module.fail_json(msg='Volume {0} not found'.format(module.params['volume']))

    if host is None and state == 'present':
        make_host(module, array)
    elif host and state == 'present':
        update_host(module, array)
    elif host and state == 'absent':
        delete_host(module, array)
    elif host is None and state == 'absent':
        module.exit_json(changed=False)


if __name__ == '__main__':
    main()