#
# (c) 2015 Peter Sprygada, <psprygada@ansible.com>
# (c) 2017 Red Hat, Inc
#
# Copyright (c) 2016 Dell Inc.
#
# 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.
#
# 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,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# 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.
#
import re

from ansible.module_utils._text import to_text
from ansible.module_utils.basic import env_fallback, return_values
from ansible.module_utils.network_common import to_list, ComplexList
from ansible.module_utils.connection import exec_command
from ansible.module_utils.netcfg import NetworkConfig, ConfigLine

_DEVICE_CONFIGS = {}

WARNING_PROMPTS_RE = [
    r"[\r\n]?\[confirm yes/no\]:\s?$",
    r"[\r\n]?\[y/n\]:\s?$",
    r"[\r\n]?\[yes/no\]:\s?$"
]

dellos9_provider_spec = {
    'host': dict(),
    'port': dict(type='int'),
    'username': dict(fallback=(env_fallback, ['ANSIBLE_NET_USERNAME'])),
    'password': dict(fallback=(env_fallback, ['ANSIBLE_NET_PASSWORD']), no_log=True),
    'ssh_keyfile': dict(fallback=(env_fallback, ['ANSIBLE_NET_SSH_KEYFILE']), type='path'),
    'authorize': dict(fallback=(env_fallback, ['ANSIBLE_NET_AUTHORIZE']), type='bool'),
    'auth_pass': dict(fallback=(env_fallback, ['ANSIBLE_NET_AUTH_PASS']), no_log=True),
    'timeout': dict(type='int'),
}
dellos9_argument_spec = {
    'provider': dict(type='dict', options=dellos9_provider_spec),
}
dellos9_top_spec = {
    'host': dict(removed_in_version=2.9),
    'port': dict(removed_in_version=2.9, type='int'),
    'username': dict(removed_in_version=2.9),
    'password': dict(removed_in_version=2.9, no_log=True),
    'ssh_keyfile': dict(removed_in_version=2.9, type='path'),
    'authorize': dict(removed_in_version=2.9, type='bool'),
    'auth_pass': dict(removed_in_version=2.9, no_log=True),
    'timeout': dict(removed_in_version=2.9, type='int'),
}
dellos9_argument_spec.update(dellos9_top_spec)


def check_args(module, warnings):
    pass


def get_config(module, flags=None):
    flags = [] if flags is None else flags

    cmd = 'show running-config '
    cmd += ' '.join(flags)
    cmd = cmd.strip()

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


def to_commands(module, commands):
    spec = {
        'command': dict(key=True),
        'prompt': dict(),
        'answer': dict()
    }
    transform = ComplexList(spec, module)
    return transform(commands)


def run_commands(module, commands, check_rc=True):
    responses = list()
    commands = to_commands(module, to_list(commands))
    for cmd in commands:
        cmd = module.jsonify(cmd)
        rc, out, err = exec_command(module, cmd)
        if check_rc and rc != 0:
            module.fail_json(msg=to_text(err, errors='surrogate_or_strict'), rc=rc)
        responses.append(to_text(out, errors='surrogate_or_strict'))
    return responses


def load_config(module, commands):
    rc, out, err = exec_command(module, 'configure terminal')
    if rc != 0:
        module.fail_json(msg='unable to enter configuration mode', err=to_text(err, errors='surrogate_or_strict'))

    for command in to_list(commands):
        if command == 'end':
            continue
        cmd = {'command': command, 'prompt': WARNING_PROMPTS_RE, 'answer': 'yes'}
        rc, out, err = exec_command(module, module.jsonify(cmd))
        if rc != 0:
            module.fail_json(msg=to_text(err, errors='surrogate_or_strict'), command=command, rc=rc)

    exec_command(module, 'end')


def get_sublevel_config(running_config, module):
    contents = list()
    current_config_contents = list()
    running_config = NetworkConfig(contents=running_config, indent=1)
    obj = running_config.get_object(module.params['parents'])
    if obj:
        contents = obj.children
    contents[:0] = module.params['parents']

    indent = 0
    for c in contents:
        if isinstance(c, str):
            current_config_contents.append(c.rjust(len(c) + indent, ' '))
        if isinstance(c, ConfigLine):
            current_config_contents.append(c.raw)
        indent = 1
    sublevel_config = '\n'.join(current_config_contents)

    return sublevel_config
