#!/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/>.
#

ANSIBLE_METADATA = {
    "metadata_version": "1.1",
    "status": ["preview"],
    "supported_by": "network",
}


DOCUMENTATION = """module: ios_command
author: Peter Sprygada (@privateip)
short_description: Run commands on remote devices running Cisco IOS
description:
- Sends arbitrary commands to an ios 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.
- This module does not support running commands in configuration mode. Please use
  M(ios_config) to configure IOS devices.
extends_documentation_fragment:
- cisco.ios.ios
notes:
- Tested against IOS 15.6
options:
  commands:
    description:
    - List of commands to send to the remote ios 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 retries has expired. If a command sent to the device requires
      answering a prompt, it is possible to pass a dict containing I(command), I(answer)
      and I(prompt). Common answers are 'y' or "\r" (carriage return, must be double
      quotes). See examples.
    required: true
  wait_for:
    description:
    - List of conditions to evaluate against the output of the command. The task will
      wait for each condition to be true before moving forward. If the conditional
      is not true within the configured number of retries, the task fails. 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 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 by tried before it is considered
      failed. The command is run on the target device every retry and evaluated against
      the I(wait_for) conditions.
    default: 10
  interval:
    description:
    - Configures the interval in seconds to wait between retries of the command. If
      the command does not pass the specified conditions, the interval indicates how
      long to wait before trying the command again.
    default: 1
"""

EXAMPLES = r"""
tasks:
  - name: run show version on remote devices
    ios_command:
      commands: show version

  - name: run show version and check to see if output contains IOS
    ios_command:
      commands: show version
      wait_for: result[0] contains IOS

  - name: run multiple commands on remote nodes
    ios_command:
      commands:
        - show version
        - show interfaces

  - name: run multiple commands and evaluate the output
    ios_command:
      commands:
        - show version
        - show interfaces
      wait_for:
        - result[0] contains IOS
        - result[1] contains Loopback0

  - name: run commands that require answering a prompt
    ios_command:
      commands:
        - command: 'clear counters GigabitEthernet0/1'
          prompt: 'Clear "show interface" counters on this interface \[confirm\]'
          answer: 'y'
        - command: 'clear counters GigabitEthernet0/2'
          prompt: '[confirm]'
          answer: "\r"
"""

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.cisco.ios.plugins.module_utils.network.ios.ios import (
    run_commands,
)
from ansible_collections.cisco.ios.plugins.module_utils.network.ios.ios import (
    ios_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 main():
    """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(ios_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()