#!/usr/bin/python
# Copyright: Ansible Project
# 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


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


DOCUMENTATION = """
---
module: cli_command
version_added: "2.7"
author: "Nathaniel Case (@qalthos)"
short_description: Run a cli command on cli-based network devices
description:
  - Sends a command to a network device and returns the result read from the device.
options:
  command:
    description:
      - The command to send to the remote network device.  The resulting output
        from the command is returned, unless I(sendonly) is set.
    required: true
  prompt:
    description:
      - A single regex pattern or a sequence of patterns to evaluate the expected
        prompt from I(command).
    required: false
    type: list
  answer:
    description:
      - The answer to reply with if I(prompt) is matched. The value can be a single answer
        or a list of answer for multiple prompts. In case the command execution results in
        multiple prompts the sequence of the prompt and excepted answer should be in same order.
    required: false
    type: list
  sendonly:
    description:
      - The boolean value, that when set to true will send I(command) to the
        device but not wait for a result.
    type: bool
    default: false
    required: false
"""

EXAMPLES = """
- name: run show version on remote devices
  cli_command:
    command: show version

- name: run command with json formatted output
  cli_command:
    command: show version | json

- name: run command expecting user confirmation
  cli_command:
    command: commit replace
    prompt: This commit will replace or remove the entire running configuration
    answer: yes

- name: run config mode command and handle prompt/answer
  cli_command:
    command: "{{ item }}"
    prompt:
      - "Exit with uncommitted changes"
    answer: 'y'
  loop:
    - configure
    - set system syslog file test any any
    - exit

- name: multiple prompt, multiple answer
  cli_command:
    command: "copy sftp sftp://user@host//user/test.img"
    prompt:
      - "Confirm download operation"
      - "Password"
      - "Do you want to change that to the standby image"
    answer:
      - 'y'
      - <password>
      - 'y'
"""

RETURN = """
stdout:
  description: The response from the command
  returned: when sendonly is false
  type: string
  sample: 'Version:      VyOS 1.1.7[...]'

json:
  description: A dictionary representing a JSON-formatted response
  returned: when the device response is valid JSON
  type: dict
  sample: |
    {
      "architecture": "i386",
      "bootupTimestamp": 1532649700.56,
      "modelName": "vEOS",
      "version": "4.15.9M"
      [...]
    }
"""

from ansible.module_utils._text import to_text
from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.connection import Connection, ConnectionError


def main():
    """entry point for module execution
    """
    argument_spec = dict(
        command=dict(type='str', required=True),
        prompt=dict(type='list', required=False),
        answer=dict(type='list', required=False),
        sendonly=dict(type='bool', default=False, required=False),
    )
    required_together = [['prompt', 'answer']]
    module = AnsibleModule(argument_spec=argument_spec, required_together=required_together,
                           supports_check_mode=True)

    if module.check_mode and not module.params['command'].startswith('show'):
        module.fail_json(
            msg='Only show commands are supported when using check_mode, not '
            'executing %s' % module.params['command']
        )

    warnings = list()
    result = {'changed': False, 'warnings': warnings}

    connection = Connection(module._socket_path)
    response = ''
    try:
        response = connection.get(**module.params)
    except ConnectionError as exc:
        module.fail_json(msg=to_text(exc, errors='surrogate_then_replace'))

    if not module.params['sendonly']:
        try:
            result['json'] = module.from_json(response)
        except ValueError:
            pass

        result.update({
            'stdout': response,
        })

    module.exit_json(**result)


if __name__ == '__main__':
    main()