#!/usr/bin/python
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
#
from __future__ import absolute_import, division, print_function

__metaclass__ = type


DOCUMENTATION = """
module: eos_command
author: Peter Sprygada (@privateip)
short_description: Run arbitrary commands on an Arista EOS device
description:
- Sends an arbitrary set of commands to an EOS 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:
- arista.eos.eos
notes:
- Tested against EOS 4.15
options:
  commands:
    description:
    - The commands to send to the remote EOS 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.
    required: true
  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. Note - With I(wait_for) the value in C(result['stdout'])
      can be accessed using C(result), that is to access C(result['stdout'][0]) use
      C(result[0]) See examples.
    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.
    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.
    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.
    default: 1
"""

EXAMPLES = """
- name: run show version on remote devices
  arista.eos.eos_command:
    commands: show version

- name: run show version and check to see if output contains Arista
  arista.eos.eos_command:
    commands: show version
    wait_for: result[0] contains Arista

- name: run multiple commands on remote nodes
  arista.eos.eos_command:
    commands:
    - show version
    - show interfaces

- name: run multiple commands and evaluate the output
  arista.eos.eos_command:
    commands:
    - show version
    - show interfaces
    wait_for:
    - result[0] contains Arista
    - result[1] contains Loopback0

- name: run commands and specify the output format
  arista.eos.eos_command:
    commands:
    - command: show version
      output: json

- name: using cli transport, check whether the switch is in maintenance mode
  arista.eos.eos_command:
    commands: show maintenance
    wait_for: result[0] contains 'Under Maintenance'

- name: using cli transport, check whether the switch is in maintenance mode using
    json output
  arista.eos.eos_command:
    commands: show maintenance | json
    wait_for: result[0].units.System.state eq 'underMaintenance'

- name: using eapi transport check whether the switch is in maintenance, with 8 retries
    and 2 second interval between retries
  arista.eos.eos_command:
    commands: show maintenance
    wait_for: result[0]['units']['System']['state'] eq 'underMaintenance'
    interval: 2
    retries: 8
    provider:
      transport: eapi
"""

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: [['...', '...'], ['...'], ['...']]
failed_conditions:
  description: The list of conditionals that have failed
  returned: failed
  type: list
  sample: ['...', '...']
"""
import time

from ansible.module_utils._text import to_text
from ansible.module_utils.basic import AnsibleModule
from ansible_collections.ansible.netcommon.plugins.module_utils.network.common.parsing import (
    Conditional,
)
from ansible_collections.ansible.netcommon.plugins.module_utils.network.common.utils import (
    transform_commands,
    to_lines,
)
from ansible_collections.arista.eos.plugins.module_utils.network.eos.eos import (
    run_commands,
)
from ansible_collections.arista.eos.plugins.module_utils.network.eos.eos import (
    eos_argument_spec,
)


def parse_commands(module, warnings):
    commands = transform_commands(module)

    if module.check_mode:
        for item in list(commands):
            if not item["command"].startswith("show"):
                warnings.append(
                    "Only show commands are supported when using check mode, not "
                    "executing %s" % item["command"]
                )
                commands.remove(item)

    return commands


def to_cli(obj):
    cmd = obj["command"]
    if obj.get("output") == "json":
        cmd += " | json"
    return cmd


def main():
    """entry point for module execution
    """
    argument_spec = dict(
        commands=dict(type="list", required=True),
        wait_for=dict(type="list", aliases=["waitfor"]),
        match=dict(default="all", choices=["all", "any"]),
        retries=dict(default=10, type="int"),
        interval=dict(default=1, type="int"),
    )

    argument_spec.update(eos_argument_spec)

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

    warnings = list()
    result = {"changed": False, "warnings": warnings}
    commands = parse_commands(module, warnings)
    wait_for = module.params["wait_for"] or list()

    try:
        conditionals = [Conditional(c) for c in wait_for]
    except AttributeError as exc:
        module.fail_json(msg=to_text(exc))

    retries = module.params["retries"]
    interval = module.params["interval"]
    match = module.params["match"]

    while retries > 0:
        responses = run_commands(module, commands)

        for item in list(conditionals):
            if item(responses):
                if match == "any":
                    conditionals = list()
                    break
                conditionals.remove(item)

        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.update(
        {"stdout": responses, "stdout_lines": list(to_lines(responses))}
    )

    module.exit_json(**result)


if __name__ == "__main__":
    main()
