#!/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': 'community'}

DOCUMENTATION = """
---
module: onyx_config
extends_documentation_fragment: onyx
version_added: "2.5"
author: "Alex Tabachnik (@atabachnik), Samer Deeb (@samerd)"
short_description: Manage Mellanox ONYX configuration sections
description:
  - Mellanox ONYX configurations uses a simple block indent file syntax
    for segmenting configuration into sections. This module provides
    an implementation for working with ONYX configuration sections in
    a deterministic way.
options:
  lines:
    description:
      - The ordered set of commands that should be configured in the
        section.  The commands must be the exact same commands as found
        in the device running-config.  Be sure to note the configuration
        command syntax as some commands are automatically modified by the
        device config parser.
    aliases: ['commands']
  parents:
    description:
      - The ordered set of parents that uniquely identify the section
        the commands should be checked against.  If the parents argument
        is omitted, the commands are checked against the set of top
        level or global commands.
  src:
    description:
      - Specifies the source path to the file that contains the configuration
        or configuration template to load.  The path to the source file can
        either be the full path on the Ansible control host or a relative
        path from the playbook or role root directory.  This argument is mutually
        exclusive with I(lines), I(parents).
  before:
    description:
      - The ordered set of commands to push on to the command stack if
        a change needs to be made.  This allows the playbook designer
        the opportunity to perform configuration commands prior to pushing
        any changes without affecting how the set of commands are matched
        against the system.
  after:
    description:
      - The ordered set of commands to append to the end of the command
        stack if a change needs to be made.  Just like with I(before) this
        allows the playbook designer to append a set of commands to be
        executed after the command set.
  match:
    description:
      - Instructs the module on the way to perform the matching of
        the set of commands against the current device config.  If
        match is set to I(line), commands are matched line by line.  If
        match is set to I(strict), command lines are matched with respect
        to position.  If match is set to I(exact), command lines
        must be an equal match.  Finally, if match is set to I(none), the
        module will not attempt to compare the source configuration with
        the running configuration on the remote device.
    default: line
    choices: ['line', 'strict', 'exact', 'none']
  replace:
    description:
      - Instructs the module on the way to perform the configuration
        on the device.  If the replace argument is set to I(line) then
        the modified lines are pushed to the device in configuration
        mode.  If the replace argument is set to I(block) then the entire
        command block is pushed to the device in configuration mode if any
        line is not correct
    default: line
    choices: ['line', 'block']
  backup:
    description:
      - This argument will cause the module to create a full backup of
        the current C(running-config) from the remote device before any
        changes are made.  The backup file is written to the C(backup)
        folder in the playbook root directory.  If the directory does not
        exist, it is created.
    default: no
    choices: ['yes', 'no']
  config:
    description:
      - The C(config) argument allows the playbook designer to supply
        the base configuration to be used to validate configuration
        changes necessary.  If this argument is provided, the module
        will not download the running-config from the remote node.
  save:
    description:
      - The C(save) argument instructs the module to save the running-
        config to the startup-config at the conclusion of the module
        running.  If check mode is specified, this argument is ignored.
    default: no
    choices: ['yes', 'no']
"""

EXAMPLES = """
---
- onyx_config:
    lines:
      - snmp-server community
      - snmp-server host 10.2.2.2 traps version 2c
"""

RETURN = """
updates:
  description: The set of commands that will be pushed to the remote device
  returned: always
  type: list
  sample: ['...', '...']
backup_path:
  description: The full path to the backup file
  returned: when backup is yes
  type: string
  sample: /playbooks/ansible/backup/onyx_config.2016-07-16@22:28:34
"""

from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.network.common.config import NetworkConfig, dumps

from ansible.module_utils.network.onyx.onyx import get_config
from ansible.module_utils.network.onyx.onyx import load_config
from ansible.module_utils.network.onyx.onyx import run_commands


def get_candidate(module):
    candidate = NetworkConfig(indent=1)
    if module.params['src']:
        candidate.load(module.params['src'])
    elif module.params['lines']:
        parents = module.params['parents'] or list()
        candidate.add(module.params['lines'], parents=parents)
    return candidate


def run(module, result):
    match = module.params['match']
    replace = module.params['replace']
    path = module.params['parents']

    candidate = get_candidate(module)
    if match != 'none':
        contents = module.params['config']
        if not contents:
            contents = get_config(module)
        config = NetworkConfig(indent=1, contents=contents)
        configobjs = candidate.difference(config, path=path, match=match,
                                          replace=replace)

    else:
        configobjs = candidate.items

    if configobjs:
        commands = dumps(configobjs, 'commands').split('\n')

        if module.params['lines']:
            if module.params['before']:
                commands[:0] = module.params['before']

            if module.params['after']:
                commands.extend(module.params['after'])

        result['updates'] = commands

        # send the configuration commands to the device and merge
        # them with the current running config
        if not module.check_mode:
            load_config(module, commands)
        result['changed'] = True

    if module.params['save']:
        if not module.check_mode:
            run_commands(module, 'configuration write')
        result['changed'] = True


def main():
    """ main entry point for module execution
    """
    argument_spec = dict(
        src=dict(type='path'),

        lines=dict(aliases=['commands'], type='list'),
        parents=dict(type='list'),

        before=dict(type='list'),
        after=dict(type='list'),

        match=dict(default='line', choices=['line', 'strict', 'exact', 'none']),
        replace=dict(default='line', choices=['line', 'block']),

        config=dict(),

        backup=dict(type='bool', default=False),
        save=dict(type='bool', default=False),
    )

    mutually_exclusive = [('lines', 'src'),
                          ('parents', 'src')]

    required_if = [('match', 'strict', ['lines']),
                   ('match', 'exact', ['lines']),
                   ('replace', 'block', ['lines'])]

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

    result = {'changed': False}
    if module.params['backup']:
        result['__backup__'] = get_config(module)

    run(module, result)

    module.exit_json(**result)


if __name__ == '__main__':
    main()
