# 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
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# THE SOFTWARE.

from ansiblelint import AnsibleLintRule
import re


def unjinja(text):
    return re.sub("\{\{[^\}]*\}\}", "JINJA_VAR", text)


class UseCommandInsteadOfShellRule(AnsibleLintRule):
    id = 'ANSIBLE0013'
    shortdesc = 'Use shell only when shell functionality is required'
    description = 'Shell should only be used when piping, redirecting ' \
                  'or chaining commands (and Ansible would be preferred ' \
                  'for some of those!)'
    tags = ['safety']

    def matchtask(self, file, task):
        # Use unjinja so that we don't match on jinja filters
        # rather than pipes
        if task["action"]["__ansible_module__"] == 'shell':
            unjinjad_cmd = unjinja(' '.join(task["action"].get("__ansible_arguments__", [])))
            return not any([ch in unjinjad_cmd for ch in '&|<>;$\n*[]{}?'])
