#
# Author: Bo Maryniuk <bo@suse.de>
#
# Copyright 2017 SUSE LLC
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

r"""
Execution of Ansible modules from within states
===============================================

With `ansible.call` these states allow individual Ansible module calls to be
made via states. To call an Ansible module function use a :mod:`module.run <salt.states.ansible.call>`
state:

.. code-block:: yaml

    some_set_of_tasks:
      ansible:
        - system.ping
        - packaging.os.zypper
          - name: emacs
          - state: installed

"""
import logging
import os
import sys

import salt.fileclient
import salt.utils.decorators.path
from salt.loader.dunder import __file_client__
from salt.utils.decorators import depends

log = logging.getLogger(__name__)
__virtualname__ = "ansible"


def _file_client():
    """
    Return a file client

    If the __file_client__ context is set return it, otherwize create a new
    file client using __opts__.
    """
    if __file_client__:
        return __file_client__.value()
    return salt.fileclient.get_file_client(__opts__)


@depends("ansible")
class AnsibleState:
    """
    Ansible state caller.
    """

    def get_args(self, argset):
        """
        Get args and kwargs from the argset.

        :param argset:
        :return:
        """
        args = []
        kwargs = {}
        for element in argset or []:
            if isinstance(element, dict):
                kwargs.update(element)
            else:
                args.append(element)
        return args, kwargs

    def __call__(self, **kwargs):
        """
        Call Ansible module.

        :return:
        """

        ret = {
            "name": kwargs.pop("name"),
            "changes": {},
            "comment": "",
            "result": True,
        }

        for mod_name, mod_params in kwargs.items():
            args, kwargs = self.get_args(mod_params)
            try:
                ans_mod_out = __salt__["ansible.{}".format(mod_name)](
                    **{"__pub_arg": [args, kwargs]}
                )
            except Exception as err:  # pylint: disable=broad-except
                ans_mod_out = 'Module "{}" failed. Error message: ({}) {}'.format(
                    mod_name, err.__class__.__name__, err
                )
                ret["result"] = False
            ret["changes"][mod_name] = ans_mod_out

        return ret


def __virtual__():
    """
    Disable, if Ansible is not available around on the Minion.
    """
    # pylint: disable=unnecessary-lambda
    setattr(sys.modules[__name__], "call", lambda **kwargs: AnsibleState()(**kwargs))
    # pylint: enable=unnecessary-lambda
    return __virtualname__


def _changes(plays):
    """
    Find changes in ansible return data
    """
    changes = {}

    for play in plays["plays"]:
        task_changes = {}
        for task in play["tasks"]:
            host_changes = {}
            for host, data in task["hosts"].items():
                if data.get("changed", False) is True:
                    host_changes[host] = data.get("diff", data.get("changes", {}))
                elif any(x in data for x in ["failed", "skipped", "unreachable"]):
                    host_changes[host] = data.get("results", data.get("msg", {}))
            if host_changes:
                task_changes[task["task"]["name"]] = host_changes
        if task_changes:
            changes[play["play"]["name"]] = task_changes
    return changes


@salt.utils.decorators.path.which("ansible-playbook")
def playbooks(name, rundir=None, git_repo=None, git_kwargs=None, ansible_kwargs=None):
    """
    Run Ansible Playbooks

    :param name: path to playbook. This can be relative to rundir or the git repo
    :param rundir: location to run ansible-playbook from.
    :param git_repo: git repository to clone for ansible playbooks.  This is cloned
                     using the `git.latest` state, and is cloned to the `rundir`
                     if specified, otherwise it is clone to the `cache_dir`
    :param git_kwargs: extra kwargs to pass to `git.latest` state module besides
                       the `name` and `target`
    :param ansible_kwargs: extra kwargs to pass to `ansible.playbooks` execution
                           module besides the `name` and `target`

    :return: Ansible playbook output.

    .. code-block:: yaml

        run nginx install:
          ansible.playbooks:
            - name: install.yml
            - git_repo: git://github.com/gituser/playbook.git
            - git_kwargs:
                rev: master
    """
    ret = {
        "result": False,
        "changes": {},
        "comment": "Running playbook {}".format(name),
        "name": name,
    }
    if git_repo:
        if not isinstance(rundir, str) or not os.path.isdir(rundir):
            with _file_client() as client:
                rundir = client._extrn_path(git_repo, "base")
            log.trace("rundir set to %s", rundir)
        if not isinstance(git_kwargs, dict):
            log.debug("Setting git_kwargs to empty dict: %s", git_kwargs)
            git_kwargs = {}
        __states__["git.latest"](name=git_repo, target=rundir, **git_kwargs)
    if not isinstance(ansible_kwargs, dict):
        log.debug("Setting ansible_kwargs to empty dict: %s", ansible_kwargs)
        ansible_kwargs = {}
    if __opts__["test"]:
        checks = __salt__["ansible.playbooks"](
            name, rundir=rundir, check=True, diff=True, **ansible_kwargs
        )
        if "stats" not in checks:
            ret["comment"] = checks.get("stderr", checks)
            ret["result"] = False
            ret["changes"] = {}
        elif all(
            not check["changed"] and not check["failures"] and not check["unreachable"]
            for check in checks["stats"].values()
        ):
            ret["comment"] = "No changes to be made from playbook {}".format(name)
            ret["result"] = True
        elif any(
            check["changed"] and not check["failures"] and not check["unreachable"]
            for check in checks["stats"].values()
        ):
            ret["comment"] = "Changes will be made from playbook {}".format(name)
            ret["result"] = None
            ret["changes"] = _changes(checks)
        else:
            ret["comment"] = "There were some issues running the playbook {}".format(
                name
            )
            ret["result"] = False
            ret["changes"] = _changes(checks)
    else:
        results = __salt__["ansible.playbooks"](
            name, rundir=rundir, diff=True, **ansible_kwargs
        )
        if "stats" not in results:
            ret["comment"] = results.get("stderr", results)
            ret["result"] = False
            ret["changes"] = {}
        elif all(
            not check["changed"] and not check["failures"] and not check["unreachable"]
            for check in results["stats"].values()
        ):
            ret["comment"] = "No changes to be made from playbook {}".format(name)
            ret["result"] = True
            ret["changes"] = _changes(results)
        else:
            ret["changes"] = _changes(results)
            ret["result"] = all(
                not check["failures"] and not check["unreachable"]
                for check in results["stats"].values()
            )
            if ret["result"]:
                ret["comment"] = "Changes were made by playbook {}".format(name)
            else:
                ret[
                    "comment"
                ] = "There were some issues running the playbook {}".format(name)
    return ret
