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

# (c) 2017, Ansible by Red Hat, 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: junos_command
author: Peter Sprygada (@privateip)
short_description: Run arbitrary commands on an Juniper JUNOS device
description:
- Sends an arbitrary set of commands to an JUNOS node and returns the results read
  from the device.  This module includes an argument that will cause the module to
  wait for a specific condition before returning or timing out if the condition is
  not met.
version_added: 1.0.0
extends_documentation_fragment:
- junipernetworks.junos.junos
options:
  commands:
    description:
    - The commands to send to the remote junos device over the configured provider.  The
      resulting output from the command is returned.  If the I(wait_for) argument
      is provided, the module is not returned until the condition is satisfied or
      the number of I(retries) has been exceeded.
    type: list
    elements: str
  rpcs:
    description:
    - The C(rpcs) argument accepts a list of RPCs to be executed over a netconf session
      and the results from the RPC execution is return to the playbook via the modules
      results dictionary.
    type: list
    elements: str
  wait_for:
    description:
    - Specifies what to evaluate from the output of the command and what conditionals
      to apply.  This argument will cause the task to wait for a particular conditional
      to be true before moving forward.   If the conditional is not true by the configured
      retries, the task fails.  See examples.
    type: list
    elements: str
    aliases:
    - waitfor
  match:
    description:
    - The I(match) argument is used in conjunction with the I(wait_for) argument to
      specify the match policy.  Valid values are C(all) or C(any).  If the value
      is set to C(all) then all conditionals in the I(wait_for) must be satisfied.  If
      the value is set to C(any) then only one of the values must be satisfied.
    type: str
    default: all
    choices:
    - any
    - all
  retries:
    description:
    - Specifies the number of retries a command should be tried before it is considered
      failed.  The command is run on the target device every retry and evaluated against
      the I(wait_for) conditionals.
    type: int
    default: 10
  interval:
    description:
    - Configures the interval in seconds to wait between retries of the command.  If
      the command does not pass the specified conditional, the interval indicates
      how to long to wait before trying the command again.
    type: int
    default: 1
  display:
    description:
    - Encoding scheme to use when serializing output from the device. This handles
      how to properly understand the output and apply the conditionals path to the
      result set. For I(rpcs) argument default display is C(xml) and for I(commands)
      argument default display is C(text). Value C(set) is applicable only for fetching
      configuration from device.
    type: str
    aliases:
    - format
    - output
    choices:
    - text
    - json
    - xml
    - set
requirements:
- jxmlease
- ncclient (>=v0.5.2)
notes:
- This module requires the netconf system service be enabled on the remote device
  being managed.
- Tested against vSRX JUNOS version 15.1X49-D15.4, vqfx-10000 JUNOS Version 15.1X53-D60.4.
- Recommended connection is C(netconf). See L(the Junos OS Platform Options,../network/user_guide/platform_junos.html).
- This module also works with C(network_cli) connections and with C(local) connections
  for legacy playbooks.
"""

EXAMPLES = """
- name: run show version on remote devices
  junipernetworks.junos.junos_command:
    commands: show version

- name: run show version and check to see if output contains Juniper
  junipernetworks.junos.junos_command:
    commands: show version
    wait_for: result[0] contains Juniper

- name: run multiple commands on remote nodes
  junipernetworks.junos.junos_command:
    commands:
    - show version
    - show interfaces

- name: run multiple commands and evaluate the output
  junipernetworks.junos.junos_command:
    commands:
    - show version
    - show interfaces
    wait_for:
    - result[0] contains Juniper
    - result[1] contains Loopback0

- name: run commands and specify the output format
  junipernetworks.junos.junos_command:
    commands: show version
    display: json

- name: run rpc on the remote device
  junipernetworks.junos.junos_command:
    commands: show configuration
    display: set

- name: run rpc on the remote device
  junipernetworks.junos.junos_command:
    rpcs: get-software-information
"""

RETURN = """
stdout:
  description: The set of responses from the commands
  returned: always apart from low level errors (such as action plugin)
  type: list
  sample: ['...', '...']
stdout_lines:
  description: The value of stdout split into a list
  returned: always apart from low level errors (such as action plugin)
  type: list
  sample: [['...', '...'], ['...'], ['...']]
output:
  description: The set of transformed xml to json format from the commands responses
  returned: If the I(display) is in C(xml) format.
  type: list
  sample: ['...', '...']
failed_conditions:
  description: The list of conditionals that have failed
  returned: failed
  type: list
  sample: ['...', '...']
"""
import re
import shlex
import time

from ansible.module_utils._text import to_text
from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.connection import ConnectionError
from ansible_collections.ansible.netcommon.plugins.module_utils.network.common.netconf import (
    exec_rpc,
)
from ansible_collections.junipernetworks.junos.plugins.module_utils.network.junos.junos import (
    junos_argument_spec,
    get_configuration,
    get_connection,
    get_capabilities,
    tostring,
)
from ansible_collections.ansible.netcommon.plugins.module_utils.network.common.parsing import (
    Conditional,
    FailedConditionalError,
)
from ansible_collections.ansible.netcommon.plugins.module_utils.network.common.utils import (
    to_lines,
)
from ansible.module_utils.six import iteritems

try:
    from lxml.etree import Element, SubElement
except ImportError:
    from xml.etree.ElementTree import Element, SubElement

try:
    import jxmlease

    HAS_JXMLEASE = True
except ImportError:
    HAS_JXMLEASE = False

USE_PERSISTENT_CONNECTION = True


def rpc(module, items):

    responses = list()
    for item in items:
        name = item["name"]
        xattrs = item["xattrs"]
        fetch_config = False

        args = item.get("args")
        text = item.get("text")

        name = str(name).replace("_", "-")

        if all((module.check_mode, not name.startswith("get"))):
            module.fail_json(msg="invalid rpc for running in check_mode")

        if (
            name == "command"
            and text == "show configuration"
            or name == "get-configuration"
        ):
            fetch_config = True

        element = Element(name, xattrs)

        if text:
            element.text = text

        elif args:
            for key, value in iteritems(args):
                key = str(key).replace("_", "-")
                if isinstance(value, list):
                    for item in value:
                        child = SubElement(element, key)
                        if item is not True:
                            child.text = item
                else:
                    child = SubElement(element, key)
                    if value is not True:
                        child.text = value
        if fetch_config:
            reply = get_configuration(module, format=xattrs["format"])
        else:
            reply = exec_rpc(module, tostring(element), ignore_warning=False)

        if xattrs["format"] == "text":
            if len(reply) >= 1:
                if fetch_config:
                    data = reply.find(".//configuration-text")
                else:
                    if text and text.startswith("show configuration"):
                        data = reply.find(".//configuration-output")
                    else:
                        data = reply.find(".//output")

                if data is None:
                    module.fail_json(msg=tostring(reply))

                responses.append(data.text.strip())
            else:
                responses.append(reply.text.strip())

        elif xattrs["format"] == "json":
            responses.append(module.from_json(reply.text.strip()))

        elif xattrs["format"] == "set":
            data = reply.find(".//configuration-set")
            if data is None:
                module.fail_json(
                    msg="Display format 'set' is not supported by remote device."
                )
            responses.append(data.text.strip())

        else:
            responses.append(tostring(reply))

    return responses


def split(value):
    lex = shlex.shlex(value)
    lex.quotes = '"'
    lex.whitespace_split = True
    lex.commenters = ""
    return list(lex)


def parse_rpcs(module):
    items = list()

    for rpc in module.params["rpcs"] or list():
        parts = shlex.split(rpc)

        name = parts.pop(0)
        args = dict()

        for item in parts:
            key, value = item.split("=")
            if str(value).upper() in ["TRUE", "FALSE"]:
                args[key] = bool(value)
            elif re.match(r"^[0-9]+$", value):
                args[key] = int(value)
            else:
                args[key] = str(value)

        display = module.params["display"] or "xml"

        if display == "set" and rpc != "get-configuration":
            module.fail_json(
                msg="Invalid display option '%s' given for rpc '%s'"
                % ("set", name)
            )

        xattrs = {"format": display}
        items.append({"name": name, "args": args, "xattrs": xattrs})

    return items


def parse_commands(module, warnings):
    items = list()

    for command in module.params["commands"] or list():
        if module.check_mode and not command.startswith("show"):
            warnings.append(
                "Only show commands are supported when using check_mode, not "
                "executing %s" % command
            )
            continue

        parts = command.split("|")
        text = parts[0]

        display = module.params["display"] or "text"

        if "| display json" in command:
            display = "json"

        elif "| display xml" in command:
            display = "xml"

        if display == "set" or "| display set" in command:
            if command.startswith("show configuration"):
                display = "set"
            else:
                module.fail_json(
                    msg="Invalid display option '%s' given for command '%s'"
                    % ("set", command)
                )

        xattrs = {"format": display}
        items.append({"name": "command", "xattrs": xattrs, "text": text})

    return items


def main():
    """entry point for module execution"""
    argument_spec = dict(
        commands=dict(type="list", elements="str"),
        rpcs=dict(type="list", elements="str"),
        display=dict(
            choices=["text", "json", "xml", "set"],
            aliases=["format", "output"],
        ),
        wait_for=dict(type="list", aliases=["waitfor"], elements="str"),
        match=dict(default="all", choices=["all", "any"]),
        retries=dict(default=10, type="int"),
        interval=dict(default=1, type="int"),
    )

    argument_spec.update(junos_argument_spec)

    required_one_of = [("commands", "rpcs")]

    module = AnsibleModule(
        argument_spec=argument_spec,
        required_one_of=required_one_of,
        supports_check_mode=True,
    )

    warnings = list()
    conn = get_connection(module)
    capabilities = get_capabilities(module)

    if capabilities.get("network_api") == "cliconf":
        if any(
            (
                module.params["wait_for"],
                module.params["match"],
                module.params["rpcs"],
            )
        ):
            module.warn(
                "arguments wait_for, match, rpcs are not supported when using transport=cli"
            )
        commands = module.params["commands"]

        output = list()
        display = module.params["display"]
        for cmd in commands:
            # if display format is not mentioned in command, add the display format
            # from the modules params
            if ("display json" not in cmd) and ("display xml" not in cmd):
                if display and display != "text":
                    cmd += " | display {0}".format(display)
            try:
                output.append(conn.get(command=cmd))
            except ConnectionError as exc:
                module.fail_json(
                    msg=to_text(exc, errors="surrogate_then_replace")
                )

        lines = [out.split("\n") for out in output]
        result = {"changed": False, "stdout": output, "stdout_lines": lines}
        module.exit_json(**result)

    items = list()
    items.extend(parse_commands(module, warnings))
    items.extend(parse_rpcs(module))

    wait_for = module.params["wait_for"] or list()
    conditionals = [Conditional(c) for c in wait_for]

    retries = module.params["retries"]
    interval = module.params["interval"]
    match = module.params["match"]
    while retries > 0:
        responses = rpc(module, items)
        transformed = list()
        output = list()
        for item, resp in zip(items, responses):
            if item["xattrs"]["format"] == "xml":
                if not HAS_JXMLEASE:
                    module.fail_json(
                        msg="jxmlease is required but does not appear to be installed. "
                        "It can be installed using `pip install jxmlease`"
                    )

                try:
                    json_resp = jxmlease.parse(resp)
                    transformed.append(json_resp)
                    output.append(json_resp)
                except Exception:
                    raise ValueError(resp)
            else:
                transformed.append(resp)

        for item in list(conditionals):
            try:
                if item(transformed):
                    if match == "any":
                        conditionals = list()
                        break
                    conditionals.remove(item)
            except FailedConditionalError:
                pass

        if not conditionals:
            break

        time.sleep(interval)
        retries -= 1

    if conditionals:
        failed_conditions = [item.raw for item in conditionals]
        msg = "One or more conditional statements have not been satisfied"
        module.fail_json(msg=msg, failed_conditions=failed_conditions)

    result = {
        "changed": False,
        "warnings": warnings,
        "stdout": responses,
        "stdout_lines": list(to_lines(responses)),
    }

    if output:
        result["output"] = output

    module.exit_json(**result)


if __name__ == "__main__":
    main()