#!/usr/bin/python

# (c) 2018-2021, NetApp, Inc
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)

'''
na_ontap_export_policy
'''

from __future__ import absolute_import, division, print_function

__metaclass__ = type

DOCUMENTATION = '''
module: na_ontap_export_policy
short_description: NetApp ONTAP manage export-policy
extends_documentation_fragment:
    - netapp.ontap.netapp.na_ontap
version_added: 2.6.0
author: NetApp Ansible Team (@carchi8py) <ng-ansibleteam@netapp.com>
description:
- Create or destroy or rename export-policies on ONTAP
options:
  state:
    description:
    - Whether the specified export policy should exist or not.
    choices: ['present', 'absent']
    type: str
    default: present
  name:
    description:
    - The name of the export-policy to manage.
    type: str
    required: true
  from_name:
    description:
    - The name of the export-policy to be renamed.
    type: str
    version_added: 2.7.0
  vserver:
    required: true
    type: str
    description:
    - Name of the vserver to use.
'''

EXAMPLES = """
    - name: Create Export Policy
      na_ontap_export_policy:
        state: present
        name: ansiblePolicyName
        vserver: vs_hack
        hostname: "{{ netapp_hostname }}"
        username: "{{ netapp_username }}"
        password: "{{ netapp_password }}"
    - name: Rename Export Policy
      na_ontap_export_policy:
        action: present
        from_name: ansiblePolicyName
        vserver: vs_hack
        name: newPolicyName
        hostname: "{{ netapp_hostname }}"
        username: "{{ netapp_username }}"
        password: "{{ netapp_password }}"
    - name: Delete Export Policy
      na_ontap_export_policy:
        state: absent
        name: ansiblePolicyName
        vserver: vs_hack
        hostname: "{{ netapp_hostname }}"
        username: "{{ netapp_username }}"
        password: "{{ netapp_password }}"
"""

RETURN = """
"""

import traceback
from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils._text import to_native
import ansible_collections.netapp.ontap.plugins.module_utils.netapp as netapp_utils
from ansible_collections.netapp.ontap.plugins.module_utils.netapp import OntapRestAPI
from ansible_collections.netapp.ontap.plugins.module_utils.netapp_module import NetAppModule
from ansible_collections.netapp.ontap.plugins.module_utils import rest_generic

HAS_NETAPP_LIB = netapp_utils.has_netapp_lib()


class NetAppONTAPExportPolicy():
    """
    Class with export policy methods
    """

    def __init__(self):
        self.use_rest = False
        self.argument_spec = netapp_utils.na_ontap_host_argument_spec()
        self.argument_spec.update(dict(
            state=dict(required=False, type='str', choices=['present', 'absent'], default='present'),
            name=dict(required=True, type='str'),
            from_name=dict(required=False, type='str', default=None),
            vserver=dict(required=True, type='str')
        ))
        self.module = AnsibleModule(
            argument_spec=self.argument_spec,
            supports_check_mode=True
        )

        self.na_helper = NetAppModule()
        self.parameters = self.na_helper.set_parameters(self.module.params)

        self.rest_api = OntapRestAPI(self.module)
        if self.rest_api.is_rest():
            self.use_rest = True
        elif HAS_NETAPP_LIB is False:
            self.module.fail_json(msg="the python NetApp-Lib module is required")
        else:
            self.server = netapp_utils.setup_na_ontap_zapi(module=self.module, vserver=self.parameters['vserver'])

    def get_export_policy(self, name=None):
        """
        Return details about the export-policy
        :param:
            name : Name of the export-policy
        :return: Details about the export-policy. None if not found.
        :rtype: dict
        """
        if name is None:
            name = self.parameters['name']
        if self.use_rest:
            return self.get_export_policy_rest(name)
        else:
            export_policy_iter = netapp_utils.zapi.NaElement('export-policy-get-iter')
            export_policy_info = netapp_utils.zapi.NaElement('export-policy-info')
            export_policy_info.add_new_child('policy-name', name)
            export_policy_info.add_new_child('vserver', self.parameters['vserver'])
            query = netapp_utils.zapi.NaElement('query')
            query.add_child_elem(export_policy_info)
            export_policy_iter.add_child_elem(query)
            result = self.server.invoke_successfully(export_policy_iter, True)
            return_value = None
            # check if query returns the expected export-policy
            if result.get_child_by_name('num-records') and \
                    int(result.get_child_content('num-records')) == 1:
                export_policy = result.get_child_by_name('attributes-list').get_child_by_name(
                    'export-policy-info').get_child_by_name('policy-name')
                return_value = {
                    'policy-name': export_policy
                }
            return return_value

    def create_export_policy(self):
        """
        Creates an export policy
        """
        if self.use_rest:
            return self.create_export_policy_rest()
        export_policy_create = netapp_utils.zapi.NaElement.create_node_with_children(
            'export-policy-create', **{'policy-name': self.parameters['name']})
        try:
            self.server.invoke_successfully(export_policy_create,
                                            enable_tunneling=True)
        except netapp_utils.zapi.NaApiError as error:
            self.module.fail_json(msg='Error on creating export-policy %s: %s'
                                      % (self.parameters['name'], to_native(error)),
                                  exception=traceback.format_exc())

    def delete_export_policy(self, current):
        """
        Delete export-policy
        """
        if self.use_rest:
            return self.delete_export_policy_rest(current)
        export_policy_delete = netapp_utils.zapi.NaElement.create_node_with_children(
            'export-policy-destroy', **{'policy-name': self.parameters['name'], })
        try:
            self.server.invoke_successfully(export_policy_delete,
                                            enable_tunneling=True)
        except netapp_utils.zapi.NaApiError as error:
            self.module.fail_json(msg='Error on deleting export-policy %s: %s'
                                      % (self.parameters['name'],
                                         to_native(error)), exception=traceback.format_exc())

    def rename_export_policy(self):
        """
        Rename the export-policy.
        """
        export_policy_rename = netapp_utils.zapi.NaElement.create_node_with_children(
            'export-policy-rename', **{'policy-name': self.parameters['from_name'],
                                       'new-policy-name': self.parameters['name']})
        try:
            self.server.invoke_successfully(export_policy_rename,
                                            enable_tunneling=True)
        except netapp_utils.zapi.NaApiError as error:
            self.module.fail_json(msg='Error on renaming export-policy %s:%s'
                                      % (self.parameters['name'], to_native(error)),
                                  exception=traceback.format_exc())

    def get_export_policy_rest(self, name):
        options = {'fields': 'name,id',
                   'svm.name': self.parameters['vserver'],
                   'name': name}
        api = 'protocols/nfs/export-policies/'
        record, error = rest_generic.get_one_record(self.rest_api, api, options)
        if error:
            self.module.fail_json(msg="Error on fetching export policy: %s" % error)
        if record:
            return {
                'name': record['name'],
                'id': record['id']
            }
        else:
            return record

    def create_export_policy_rest(self):
        params = {'name': self.parameters['name'],
                  'svm.name': self.parameters['vserver']}
        api = 'protocols/nfs/export-policies'
        dummy, error = rest_generic.post_async(self.rest_api, api, params)
        if error is not None:
            self.module.fail_json(msg="Error on creating export policy: %s" % error)

    def delete_export_policy_rest(self, current):
        policy_id = current['id']
        api = 'protocols/nfs/export-policies'
        dummy, error = rest_generic.delete_async(self.rest_api, api, policy_id)
        if error is not None:
            self.module.fail_json(msg=" Error on deleting export policy: %s" % error)

    def rename_export_policy_rest(self, current):
        policy_id = current['id']
        params = {'name': self.parameters['name']}
        api = 'protocols/nfs/export-policies'
        dummy, error = rest_generic.patch_async(self.rest_api, api, policy_id, params)
        if error is not None:
            self.module.fail_json(msg="Error on renaming export policy: %s" % error)

    def apply(self):
        """
        Apply action to export-policy
        """
        cd_action, rename, from_current = None, None, None

        if not self.use_rest:
            netapp_utils.ems_log_event("na_ontap_export_policy", self.server)

        current = self.get_export_policy()
        if self.parameters.get('from_name'):
            from_current = self.get_export_policy(self.parameters['from_name'])
            rename = self.na_helper.is_rename_action(from_current, current)
            if rename is None:
                self.module.fail_json(
                    msg="Error renaming: export policy %s does not exist" % self.parameters['from_name'])
        else:
            cd_action = self.na_helper.get_cd_action(current, self.parameters)

        if self.na_helper.changed and not self.module.check_mode:
            if rename:
                if self.use_rest:
                    self.rename_export_policy_rest(from_current)
                else:
                    self.rename_export_policy()
            elif cd_action == 'create':
                self.create_export_policy()
            elif cd_action == 'delete':
                self.delete_export_policy(current)
        self.module.exit_json(changed=self.na_helper.changed)


def main():
    """
    Execute action
    """
    export_policy = NetAppONTAPExportPolicy()
    export_policy.apply()


if __name__ == '__main__':
    main()