# This code is part of Ansible, but is an independent component.
# This particular file snippet, and this file snippet only, is BSD licensed.
# Modules you write using this snippet, which is embedded dynamically by Ansible
# still belong to the author of the module, and may assign their own license
# to the complete work.
#
# (c) 2016 Red Hat Inc.
#
# Redistribution and use in source and binary forms, with or without modification,
# are permitted provided that the following conditions are met:
#
#    * Redistributions of source code must retain the above copyright
#      notice, this list of conditions and the following disclaimer.
#    * Redistributions in binary form must reproduce the above copyright notice,
#      this list of conditions and the following disclaimer in the documentation
#      and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
# USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#

_DEVICE_CONFIGS = {}

def get_config(module, target='commands'):
    cmd = ' '.join(['show configuration', target])

    try:
        return _DEVICE_CONFIGS[cmd]
    except KeyError:
        rc, out, err = module.exec_command(cmd)
        if rc != 0:
            module.fail_json(msg='unable to retrieve current config', stderr=err)
        cfg = str(out).strip()
        _DEVICE_CONFIGS[cmd] = cfg
        return cfg

def run_commands(module, commands, check_rc=True):
    assert isinstance(commands, list), 'commands must be a list'
    responses = list()

    for cmd in commands:
        rc, out, err = module.exec_command(cmd)
        if check_rc and rc != 0:
            module.fail_json(msg=err, rc=rc)
        responses.append(out)
    return responses

def load_config(module, commands, commit=False, comment=None, save=False):
    assert isinstance(commands, list), 'commands must be a list'
    commands.insert(0, 'configure')

    for cmd in commands:
        rc, out, err = module.exec_command(cmd, check_rc=False)
        if rc != 0:
            # discard any changes in case of failure
            module.exec_command('exit discard')
            module.fail_json(msg='configuration failed')

    diff = None
    if module._diff:
        rc, out, err = module.exec_command('compare')
        if not out.startswith('No changes'):
            rc, out, err = module.exec_command('show')
            diff = str(out).strip()

    if commit:
        cmd = 'commit'
        if comment:
            cmd += ' comment "%s"' % comment
        module.exec_command(cmd)

    if save:
        module.exec_command(cmd)

    if not commit:
        module.exec_command('exit discard')
    else:
        module.exec_command('exit')

    if diff:
        return diff