#
# (c) 2020 Peter Sprygada, <psprygada@ansible.com>
# (c) 2020 Red Hat, Inc
#
# Copyright (c) 2020 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.
#
from __future__ import absolute_import, division, print_function
__metaclass__ = type

import re
import json
from ansible.module_utils._text import to_text
from ansible.module_utils.basic import env_fallback
from ansible_collections.ansible.netcommon.plugins.module_utils.network.common.utils import to_list, ComplexList
from ansible.module_utils.connection import exec_command
from ansible_collections.ansible.netcommon.plugins.module_utils.network.common.config import NetworkConfig, ConfigLine, ignore_line
from ansible.module_utils._text import to_bytes
from ansible.module_utils.connection import Connection, ConnectionError

_DEVICE_CONFIGS = {}

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

os6_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'),
}
os6_argument_spec = {
    'provider': dict(type='dict', options=os6_provider_spec),
}


def check_args(module, warnings):
    pass


def get_connection(module):
    if hasattr(module, "_os6_connection"):
        return module._os6_connection

    capabilities = get_capabilities(module)
    network_api = capabilities.get("network_api")
    if network_api in ["cliconf"]:
        module._os6_connection = Connection(module._socket_path)
    else:
        module.fail_json(msg="Invalid connection type %s" % network_api)

    return module._os6_connection


def get_capabilities(module):
    if hasattr(module, "_os6_capabilities"):
        return module._os6_capabilities
    try:
        capabilities = Connection(module._socket_path).get_capabilities()
    except ConnectionError as exc:
        module.fail_json(msg=to_text(exc, errors="surrogate_then_replace"))
    module._os6_capabilities = json.loads(capabilities)
    return module._os6_capabilities


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(),
        'sendonly': dict(),
        'newline': 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
        rc, out, err = exec_command(module, command)
        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()
    sublevel_config = NetworkConfig(indent=0)
    obj = running_config.get_object(module.params['parents'])
    if obj:
        contents = obj._children
    for c in contents:
        if isinstance(c, ConfigLine):
            current_config_contents.append(c.raw)
    sublevel_config.add(current_config_contents, module.params['parents'])
    return sublevel_config


def os6_parse(lines, indent=None, comment_tokens=None):
    sublevel_cmds = [
        re.compile(r'^vlan\s[\d,-]+.*$'),
        re.compile(r'^stack.*$'),
        re.compile(r'^interface.*$'),
        re.compile(r'datacenter-bridging.*$'),
        re.compile(r'line (console|telnet|ssh).*$'),
        re.compile(r'ip ssh !(server).*$'),
        re.compile(r'ip dhcp pool.*$'),
        re.compile(r'ip vrf (?!forwarding).*$'),
        re.compile(r'(ip|mac|management|arp) access-list.*$'),
        re.compile(r'ipv6 (dhcp pool|router).*$'),
        re.compile(r'mail-server.*$'),
        re.compile(r'vpc domain.*$'),
        re.compile(r'router\s.*$'),
        re.compile(r'route-map.*$'),
        re.compile(r'policy-map.*$'),
        re.compile(r'class-map match-all.*$'),
        re.compile(r'captive-portal.*$'),
        re.compile(r'admin-profile.*$'),
        re.compile(r'link-dependency group.*$'),
        re.compile(r'openflow.*$'),
        re.compile(r'support-assist.*$'),
        re.compile(r'template.*$'),
        re.compile(r'address-family.*$'),
        re.compile(r'spanning-tree mst configuration.*$'),
        re.compile(r'logging (?!.*(cli-command|buffered|console|email|facility|file|monitor|protocol|snmp|source-interface|traps|web-session)).*$'),
        re.compile(r'radius server (?!.*(attribute|dead-criteria|deadtime|timeout|key|load-balance|retransmit|source-interface|source-ip|vsa)).*$'),
        re.compile(r'(tacacs-server) host.*$')]

    childline = re.compile(r'^exit\s*$')
    config = list()
    parent = list()
    children = []
    parent_match = False
    for line in str(lines).split('\n'):
        line = str(line).strip()
        text = str(re.sub(r'([{};])', '', line)).strip()
        cfg = ConfigLine(text)
        cfg.raw = line
        if not text or ignore_line(text, comment_tokens):
            parent = list()
            children = []
            continue

        parent_match = False
        # handle sublevel parent
        for pr in sublevel_cmds:
            if pr.match(line):
                if len(parent) != 0:
                    cfg._parents.extend(parent)
                parent.append(cfg)
                config.append(cfg)
                if children:
                    children.insert(len(parent) - 1, [])
                    children[len(parent) - 2].append(cfg)
                if not children and len(parent) > 1:
                    configlist = [cfg]
                    children.append(configlist)
                    children.insert(len(parent) - 1, [])
                parent_match = True
                continue
        # handle exit
        if childline.match(line):
            if children:
                parent[len(children) - 1]._children.extend(children[len(children) - 1])
                if len(children) > 1:
                    parent[len(children) - 2]._children.extend(parent[len(children) - 1]._children)
                cfg._parents.extend(parent)
                children.pop()
                parent.pop()
            if not children:
                children = list()
                if parent:
                    cfg._parents.extend(parent)
                parent = list()
            config.append(cfg)
        # handle sublevel children
        elif parent_match is False and len(parent) > 0:
            if not children:
                cfglist = [cfg]
                children.append(cfglist)
            else:
                children[len(parent) - 1].append(cfg)
            cfg._parents.extend(parent)
            config.append(cfg)
        # handle global commands
        elif not parent:
            config.append(cfg)
    return config


class NetworkConfig(NetworkConfig):

    def load(self, contents):
        self._items = os6_parse(contents, self._indent)

    def _diff_line(self, other, path=None):
        diff = list()
        for item in self.items:
            if str(item) == "exit":
                for diff_item in diff:
                    if diff_item._parents:
                        if item._parents == diff_item._parents:
                            diff.append(item)
                            break
                    elif [e for e in item._parents if e == diff_item]:
                        diff.append(item)
                        break
            elif item not in other:
                diff.append(item)
        return diff