#!/usr/bin/python

# (c) 2020, NetApp, Inc
# 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


DOCUMENTATION = """
---
module: na_santricity_iscsi_target
short_description: NetApp E-Series manage iSCSI target configuration
description:
    - Configure the settings of an E-Series iSCSI target
author:
    - Michael Price (@lmprice)
extends_documentation_fragment:
    - netapp_eseries.santricity.santricity.santricity_doc
options:
    name:
        description:
            - The name/alias to assign to the iSCSI target.
            - This alias is often used by the initiator software in order to make an iSCSI target easier to identify.
        type: str
        required: false
        aliases:
            - alias
    ping:
        description:
            - Enable ICMP ping responses from the configured iSCSI ports.
        type: bool
        default: true
        required: false
    chap_secret:
        description:
            - Enable Challenge-Handshake Authentication Protocol (CHAP), utilizing this value as the password.
            - When this value is specified, we will always trigger an update (changed=True). We have no way of verifying
              whether or not the password has changed.
            - The chap secret may only use ascii characters with values between 32 and 126 decimal.
            - The chap secret must be no less than 12 characters, but no greater than 57 characters in length.
            - The chap secret is cleared when not specified or an empty string.
        type: str
        required: false
        aliases:
            - chap
            - password
    unnamed_discovery:
        description:
            - When an initiator initiates a discovery session to an initiator port, it is considered an unnamed
              discovery session if the iSCSI target iqn is not specified in the request.
            - This option may be disabled to increase security if desired.
        type: bool
        default: true
        required: false
notes:
    - Check mode is supported.
    - Some of the settings are dependent on the settings applied to the iSCSI interfaces. These can be configured using
      M(na_santricity_iscsi_interface).
    - This module requires a Web Services API version of >= 1.3.
"""

EXAMPLES = """
    - name: Enable ping responses and unnamed discovery sessions for all iSCSI ports
      na_santricity_iscsi_target:
        ssid: "1"
        api_url: "https://192.168.1.100:8443/devmgr/v2"
        api_username: "admin"
        api_password: "adminpass"
        validate_certs: true
        name: myTarget
        ping: true
        unnamed_discovery: true

    - name: Set the target alias and the CHAP secret
      na_santricity_iscsi_target:
        ssid: "1"
        api_url: "https://192.168.1.100:8443/devmgr/v2"
        api_username: "admin"
        api_password: "adminpass"
        validate_certs: true
        name: myTarget
        chap: password1234
"""

RETURN = """
msg:
    description: Success message
    returned: on success
    type: str
    sample: The iSCSI target settings have been updated.
alias:
    description:
        - The alias assigned to the iSCSI target.
    returned: on success
    sample: myArray
    type: str
iqn:
    description:
        - The iqn (iSCSI Qualified Name), assigned to the iSCSI target.
    returned: on success
    sample: iqn.1992-08.com.netapp:2800.000a132000b006d2000000005a0e8f45
    type: str
"""
from ansible_collections.netapp_eseries.santricity.plugins.module_utils.santricity import NetAppESeriesModule
from ansible.module_utils._text import to_native

HEADERS = {
    "Content-Type": "application/json",
    "Accept": "application/json",
}


class NetAppESeriesIscsiTarget(NetAppESeriesModule):
    def __init__(self):
        ansible_options = dict(name=dict(type="str", required=False, aliases=["alias"]),
                               ping=dict(type="bool", required=False, default=True),
                               chap_secret=dict(type="str", required=False, aliases=["chap", "password"], no_log=True),
                               unnamed_discovery=dict(type="bool", required=False, default=True))

        super(NetAppESeriesIscsiTarget, self).__init__(ansible_options=ansible_options,
                                                       web_services_version="02.00.0000.0000",
                                                       supports_check_mode=True)

        args = self.module.params

        self.name = args["name"]
        self.ping = args["ping"]
        self.chap_secret = args["chap_secret"]
        self.unnamed_discovery = args["unnamed_discovery"]

        self.check_mode = self.module.check_mode
        self.post_body = dict()
        self.controllers = list()

        if self.chap_secret:
            if len(self.chap_secret) < 12 or len(self.chap_secret) > 57:
                self.module.fail_json(msg="The provided CHAP secret is not valid, it must be between 12 and 57"
                                          " characters in length.")

            for c in self.chap_secret:
                ordinal = ord(c)
                if ordinal < 32 or ordinal > 126:
                    self.module.fail_json(msg="The provided CHAP secret is not valid, it may only utilize ascii"
                                              " characters with decimal values between 32 and 126.")

    @property
    def target(self):
        """Provide information on the iSCSI Target configuration

        Sample:
        {
          "alias": "myCustomName",
          "ping": True,
          "unnamed_discovery": True,
          "chap": False,
          "iqn": "iqn.1992-08.com.netapp:2800.000a132000b006d2000000005a0e8f45",
        }
        """
        target = dict()
        try:
            rc, data = self.request("storage-systems/%s/graph/xpath-filter?query=/storagePoolBundle/target" % self.ssid)
            # This likely isn"t an iSCSI-enabled system
            if not data:
                self.module.fail_json(msg="This storage-system does not appear to have iSCSI interfaces. Array Id [%s]." % self.ssid)

            data = data[0]
            chap = any([auth for auth in data["configuredAuthMethods"]["authMethodData"] if auth["authMethod"] == "chap"])
            target.update(dict(alias=data["alias"]["iscsiAlias"], iqn=data["nodeName"]["iscsiNodeName"], chap=chap))

            rc, data = self.request("storage-systems/%s/graph/xpath-filter?query=/sa/iscsiEntityData" % self.ssid)

            data = data[0]
            target.update(dict(ping=data["icmpPingResponseEnabled"], unnamed_discovery=data["unnamedDiscoverySessionsEnabled"]))

        except Exception as err:
            self.module.fail_json(msg="Failed to retrieve the iSCSI target information. Array Id [%s]. Error [%s]." % (self.ssid, to_native(err)))

        return target

    def apply_iscsi_settings(self):
        """Update the iSCSI target alias and CHAP settings"""
        update = False
        target = self.target

        body = dict()

        if self.name is not None and self.name != target["alias"]:
            update = True
            body["alias"] = self.name

        # If the CHAP secret was provided, we trigger an update.
        if self.chap_secret:
            update = True
            body.update(dict(enableChapAuthentication=True,
                             chapSecret=self.chap_secret))
        # If no secret was provided, then we disable chap
        elif target["chap"]:
            update = True
            body.update(dict(enableChapAuthentication=False))

        if update and not self.check_mode:
            try:
                self.request("storage-systems/%s/iscsi/target-settings" % self.ssid, method="POST", data=body)
            except Exception as err:
                self.module.fail_json(msg="Failed to update the iSCSI target settings. Array Id [%s]. Error [%s]." % (self.ssid, to_native(err)))

        return update

    def apply_target_changes(self):
        update = False
        target = self.target

        body = dict()

        if self.ping != target["ping"]:
            update = True
            body["icmpPingResponseEnabled"] = self.ping

        if self.unnamed_discovery != target["unnamed_discovery"]:
            update = True
            body["unnamedDiscoverySessionsEnabled"] = self.unnamed_discovery

        if update and not self.check_mode:
            try:
                self.request("storage-systems/%s/iscsi/entity" % self.ssid, method="POST", data=body)
            except Exception as err:
                self.module.fail_json(msg="Failed to update the iSCSI target settings. Array Id [%s]. Error [%s]." % (self.ssid, to_native(err)))
        return update

    def update(self):
        update = self.apply_iscsi_settings()
        update = self.apply_target_changes() or update

        target = self.target
        data = dict((key, target[key]) for key in target if key in ["iqn", "alias"])

        self.module.exit_json(msg="The interface settings have been updated.", changed=update, **data)


def main():
    iface = NetAppESeriesIscsiTarget()
    iface.update()


if __name__ == "__main__":
    main()