# Copyright (c) 2016 Will Thames <will@thames.id.au>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# THE SOFTWARE.

from ansiblelint import AnsibleLintRule


class CommandHasChangesCheckRule(AnsibleLintRule):
    id = 'ANSIBLE0012'
    shortdesc = 'Commands should not change things if nothing needs doing'
    description = 'Commands should either read information (and thus set ' \
                  'changed_when) or not do something if it has already been ' \
                  'done (using creates/removes) or only do it if another ' \
                  'check has a particular result (when)'
    tags = ['idempotency']

    _commands = ['command', 'shell', 'raw']

    def matchtask(self, file, task):
        if task["__ansible_action_type__"] == 'task':
            if task["action"]["__ansible_module__"] in self._commands:
                return 'changed_when' not in task and \
                    'when' not in task and \
                    'creates' not in task['action'] and \
                    'removes' not in task['action']
