"""
Manage users with the useradd command

.. important::

    If you feel that Salt should be using this module to manage users on a
    minion, and it is using a different module (or gives an error similar to
    *'user.info' is not available*), see :ref:`here
    <module-provider-override>`.

"""


import copy
import logging

import salt.utils.data
import salt.utils.user
from salt.exceptions import CommandExecutionError

try:
    import pwd

    HAS_PWD = True
except ImportError:
    HAS_PWD = False


log = logging.getLogger(__name__)

# Define the module's virtual name
__virtualname__ = "user"


def __virtual__():
    """
    Set the user module if the kernel is SunOS
    """
    if __grains__["kernel"] == "SunOS" and HAS_PWD:
        return __virtualname__
    return (
        False,
        "The solaris_user execution module failed to load: "
        "only available on Solaris systems with pwd module installed.",
    )


def _get_gecos(name):
    """
    Retrieve GECOS field info and return it in dictionary form
    """
    gecos_field = pwd.getpwnam(name).pw_gecos.split(",", 3)
    if not gecos_field:
        return {}
    else:
        # Assign empty strings for any unspecified trailing GECOS fields
        while len(gecos_field) < 4:
            gecos_field.append("")
        return {
            "fullname": str(gecos_field[0]),
            "roomnumber": str(gecos_field[1]),
            "workphone": str(gecos_field[2]),
            "homephone": str(gecos_field[3]),
        }


def _build_gecos(gecos_dict):
    """
    Accepts a dictionary entry containing GECOS field names and their values,
    and returns a full GECOS comment string, to be used with usermod.
    """
    return "{},{},{},{}".format(
        gecos_dict.get("fullname", ""),
        gecos_dict.get("roomnumber", ""),
        gecos_dict.get("workphone", ""),
        gecos_dict.get("homephone", ""),
    )


def _update_gecos(name, key, value):
    """
    Common code to change a user's GECOS information
    """
    if not isinstance(value, str):
        value = str(value)
    pre_info = _get_gecos(name)
    if not pre_info:
        return False
    if value == pre_info[key]:
        return True
    gecos_data = copy.deepcopy(pre_info)
    gecos_data[key] = value
    cmd = ["usermod", "-c", _build_gecos(gecos_data), name]
    __salt__["cmd.run"](cmd, python_shell=False)
    post_info = info(name)
    return _get_gecos(name).get(key) == value


def add(
    name,
    uid=None,
    gid=None,
    groups=None,
    home=None,
    shell=None,
    unique=True,
    fullname="",
    roomnumber="",
    workphone="",
    homephone="",
    createhome=True,
    **kwargs
):
    """
    Add a user to the minion

    CLI Example:

    .. code-block:: bash

        salt '*' user.add name <uid> <gid> <groups> <home> <shell>
    """
    if salt.utils.data.is_true(kwargs.pop("system", False)):
        log.warning("solaris_user module does not support the 'system' argument")
    if kwargs:
        log.warning("Invalid kwargs passed to user.add")

    if isinstance(groups, str):
        groups = groups.split(",")
    cmd = ["useradd"]
    if shell:
        cmd.extend(["-s", shell])
    if uid:
        cmd.extend(["-u", uid])
    if gid:
        cmd.extend(["-g", gid])
    if groups:
        cmd.extend(["-G", ",".join(groups)])
    if createhome:
        cmd.append("-m")
    if home is not None:
        cmd.extend(["-d", home])
    if not unique:
        cmd.append("-o")
    cmd.append(name)

    if __salt__["cmd.retcode"](cmd, python_shell=False) != 0:
        return False
    else:
        # At this point, the user was successfully created, so return true
        # regardless of the outcome of the below functions. If there is a
        # problem wth changing any of the user's info below, it will be raised
        # in a future highstate call. If anyone has a better idea on how to do
        # this, feel free to change it, but I didn't think it was a good idea
        # to return False when the user was successfully created since A) the
        # user does exist, and B) running useradd again would result in a
        # nonzero exit status and be interpreted as a False result.
        if fullname:
            chfullname(name, fullname)
        if roomnumber:
            chroomnumber(name, roomnumber)
        if workphone:
            chworkphone(name, workphone)
        if homephone:
            chhomephone(name, homephone)
        return True


def delete(name, remove=False, force=False):
    """
    Remove a user from the minion

    CLI Example:

    .. code-block:: bash

        salt '*' user.delete name remove=True force=True
    """
    if salt.utils.data.is_true(force):
        log.warning(
            "userdel does not support force-deleting user while user is logged in"
        )
    cmd = ["userdel"]
    if remove:
        cmd.append("-r")
    cmd.append(name)
    return __salt__["cmd.retcode"](cmd, python_shell=False) == 0


def getent(refresh=False):
    """
    Return the list of all info for all users

    CLI Example:

    .. code-block:: bash

        salt '*' user.getent
    """
    if "user.getent" in __context__ and not refresh:
        return __context__["user.getent"]

    ret = []
    for data in pwd.getpwall():
        ret.append(info(data.pw_name))
    __context__["user.getent"] = ret
    return ret


def chuid(name, uid):
    """
    Change the uid for a named user

    CLI Example:

    .. code-block:: bash

        salt '*' user.chuid foo 4376
    """
    pre_info = info(name)
    if not pre_info:
        raise CommandExecutionError("User '{}' does not exist".format(name))
    if uid == pre_info["uid"]:
        return True
    cmd = ["usermod", "-u", uid, name]
    __salt__["cmd.run"](cmd, python_shell=False)
    return info(name).get("uid") == uid


def chgid(name, gid):
    """
    Change the default group of the user

    CLI Example:

    .. code-block:: bash

        salt '*' user.chgid foo 4376
    """
    pre_info = info(name)
    if not pre_info:
        raise CommandExecutionError("User '{}' does not exist".format(name))
    if gid == pre_info["gid"]:
        return True
    cmd = ["usermod", "-g", gid, name]
    __salt__["cmd.run"](cmd, python_shell=False)
    return info(name).get("gid") == gid


def chshell(name, shell):
    """
    Change the default shell of the user

    CLI Example:

    .. code-block:: bash

        salt '*' user.chshell foo /bin/zsh
    """
    pre_info = info(name)
    if not pre_info:
        raise CommandExecutionError("User '{}' does not exist".format(name))
    if shell == pre_info["shell"]:
        return True
    cmd = ["usermod", "-s", shell, name]
    __salt__["cmd.run"](cmd, python_shell=False)
    return info(name).get("shell") == shell


def chhome(name, home, persist=False):
    """
    Set a new home directory for an existing user

    name
        Username to modify

    home
        New home directory to set

    persist : False
        Set to ``True`` to prevent configuration files in the new home
        directory from being overwritten by the files from the skeleton
        directory.

    CLI Example:

    .. code-block:: bash

        salt '*' user.chhome foo /home/users/foo True
    """
    pre_info = info(name)
    if not pre_info:
        raise CommandExecutionError("User '{}' does not exist".format(name))
    if home == pre_info["home"]:
        return True
    cmd = ["usermod", "-d", home]
    if persist:
        cmd.append("-m")
    cmd.append(name)
    __salt__["cmd.run"](cmd, python_shell=False)
    return info(name).get("home") == home


def chgroups(name, groups, append=False):
    """
    Change the groups to which a user belongs

    name
        Username to modify

    groups
        List of groups to set for the user. Can be passed as a comma-separated
        list or a Python list.

    append : False
        Set to ``True`` to append these groups to the user's existing list of
        groups. Otherwise, the specified groups will replace any existing
        groups for the user.

    CLI Example:

    .. code-block:: bash

        salt '*' user.chgroups foo wheel,root True
    """
    if isinstance(groups, str):
        groups = groups.split(",")
    ugrps = set(list_groups(name))
    if ugrps == set(groups):
        return True
    if append:
        groups.update(ugrps)
    cmd = ["usermod", "-G", ",".join(groups), name]
    return __salt__["cmd.retcode"](cmd, python_shell=False) == 0


def chfullname(name, fullname):
    """
    Change the user's Full Name

    CLI Example:

    .. code-block:: bash

        salt '*' user.chfullname foo "Foo Bar"
    """
    return _update_gecos(name, "fullname", fullname)


def chroomnumber(name, roomnumber):
    """
    Change the user's Room Number

    CLI Example:

    .. code-block:: bash

        salt '*' user.chroomnumber foo 123
    """
    return _update_gecos(name, "roomnumber", roomnumber)


def chworkphone(name, workphone):
    """
    Change the user's Work Phone

    CLI Example:

    .. code-block:: bash

        salt '*' user.chworkphone foo "7735550123"
    """
    return _update_gecos(name, "workphone", workphone)


def chhomephone(name, homephone):
    """
    Change the user's Home Phone

    CLI Example:

    .. code-block:: bash

        salt '*' user.chhomephone foo "7735551234"
    """
    return _update_gecos(name, "homephone", homephone)


def info(name):
    """
    Return user information

    CLI Example:

    .. code-block:: bash

        salt '*' user.info root
    """
    ret = {}
    try:
        data = pwd.getpwnam(name)
        ret["gid"] = data.pw_gid
        ret["groups"] = list_groups(name)
        ret["home"] = data.pw_dir
        ret["name"] = data.pw_name
        ret["passwd"] = data.pw_passwd
        ret["shell"] = data.pw_shell
        ret["uid"] = data.pw_uid
        # Put GECOS info into a list
        gecos_field = data.pw_gecos.split(",", 3)
        # Assign empty strings for any unspecified GECOS fields
        while len(gecos_field) < 4:
            gecos_field.append("")
        ret["fullname"] = gecos_field[0]
        ret["roomnumber"] = gecos_field[1]
        ret["workphone"] = gecos_field[2]
        ret["homephone"] = gecos_field[3]
    except KeyError:
        return {}
    return ret


def list_groups(name):
    """
    Return a list of groups the named user belongs to

    CLI Example:

    .. code-block:: bash

        salt '*' user.list_groups foo
    """
    return salt.utils.user.get_group_list(name)


def list_users():
    """
    Return a list of all users

    CLI Example:

    .. code-block:: bash

        salt '*' user.list_users
    """
    return sorted(user.pw_name for user in pwd.getpwall())


def rename(name, new_name):
    """
    Change the username for a named user

    CLI Example:

    .. code-block:: bash

        salt '*' user.rename name new_name
    """
    current_info = info(name)
    if not current_info:
        raise CommandExecutionError("User '{}' does not exist".format(name))
    new_info = info(new_name)
    if new_info:
        raise CommandExecutionError("User '{}' already exists".format(new_name))
    cmd = ["usermod", "-l", new_name, name]
    __salt__["cmd.run"](cmd, python_shell=False)
    return info(new_name).get("name") == new_name
