#!/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': 'community'}


DOCUMENTATION = """
---

module: ce_command
version_added: "2.3"
author: "JackyGao2016 (@CloudEngine-Ansible)"
short_description: Run arbitrary command on HUAWEI CloudEngine devices.
description:
  - Sends an arbitrary command to an HUAWEI CloudEngine node and returns
    the results read from the device.  The ce_command 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.
options:
  commands:
    description:
      - The commands to send to the remote HUAWEI CloudEngine 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.  See examples.
  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
  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)
        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 = """
# Note: examples below use the following provider dict to handle
#       transport and authentication to the node.

- name: CloudEngine command test
  hosts: cloudengine
  connection: local
  gather_facts: no
  vars:
    cli:
      host: "{{ inventory_hostname }}"
      port: "{{ ansible_ssh_port }}"
      username: "{{ username }}"
      password: "{{ password }}"
      transport: cli

  tasks:
  - name: "Run display version on remote devices"
    ce_command:
      commands: display version
      provider: "{{ cli }}"

  - name: "Run display version and check to see if output contains HUAWEI"
    ce_command:
      commands: display version
      wait_for: result[0] contains HUAWEI
      provider: "{{ cli }}"

  - name: "Run multiple commands on remote nodes"
    ce_command:
      commands:
        - display version
        - display device
      provider: "{{ cli }}"

  - name: "Run multiple commands and evaluate the output"
    ce_command:
      commands:
        - display version
        - display device
      wait_for:
        - result[0] contains HUAWEI
        - result[1] contains Device
      provider: "{{ cli }}"
"""

RETURN = """
stdout:
  description: the set of responses from the commands
  returned: always
  type: list
  sample: ['...', '...']

stdout_lines:
  description: The value of stdout split into a list
  returned: always
  type: list
  sample: [['...', '...'], ['...'], ['...']]

failed_conditions:
  description: the conditionals that failed
  returned: failed
  type: list
  sample: ['...', '...']
"""


import time
import traceback

from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.network.cloudengine.ce import ce_argument_spec, check_args
from ansible.module_utils.network.cloudengine.ce import run_commands
from ansible.module_utils.network.common.parsing import Conditional
from ansible.module_utils.network.common.utils import ComplexList
from ansible.module_utils.six import string_types
from ansible.module_utils._text import to_native


def to_lines(stdout):
    lines = list()
    for item in stdout:
        if isinstance(item, string_types):
            item = str(item).split('\n')
        lines.append(item)
    return lines


def parse_commands(module, warnings):
    transform = ComplexList(dict(
        command=dict(key=True),
        output=dict(),
        prompt=dict(),
        answer=dict()
    ), module)

    commands = transform(module.params['commands'])

    for _, item in enumerate(commands):
        if module.check_mode and not item['command'].startswith('dis'):
            warnings.append(
                'Only display commands are supported when using check_mode, not '
                'executing %s' % item['command']
            )

    return commands


def to_cli(obj):
    cmd = obj['command']
    return cmd


def main():
    """entry point for module execution
    """
    argument_spec = dict(
        # { command: <str>, output: <str>, prompt: <str>, response: <str> }
        commands=dict(type='list', required=True),

        wait_for=dict(type='list'),
        match=dict(default='all', choices=['any', 'all']),

        retries=dict(default=10, type='int'),
        interval=dict(default=1, type='int')
    )

    argument_spec.update(ce_argument_spec)

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

    result = {'changed': False}

    warnings = list()
    check_args(module, warnings)
    commands = parse_commands(module, warnings)
    result['warnings'] = 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_native(exc), exception=traceback.format_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': to_lines(responses)
    })

    module.exit_json(**result)


if __name__ == '__main__':
    main()
