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"""
Management of NTP servers on Windows

.. versionadded:: 2014.1.0
"""

import logging

import salt.utils.platform

log = logging.getLogger(__name__)

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


def __virtual__():
    """
    This only supports Windows
    """
    if not salt.utils.platform.is_windows():
        return (False, "Module win_system: module only works on Windows systems")
    return __virtualname__


def set_servers(*servers):
    """
    Set Windows to use a list of NTP servers

    CLI Example:

    .. code-block:: bash

        salt '*' ntp.set_servers 'pool.ntp.org' 'us.pool.ntp.org'
    """
    service_name = "w32time"
    if not __salt__["service.status"](service_name):
        if not __salt__["service.start"](service_name):
            return False

    server_cmd = [
        "W32tm",
        "/config",
        "/syncfromflags:manual",
        "/manualpeerlist:{}".format(" ".join(servers)),
    ]
    reliable_cmd = ["W32tm", "/config", "/reliable:yes"]
    update_cmd = ["W32tm", "/config", "/update"]

    for cmd in server_cmd, reliable_cmd, update_cmd:
        __salt__["cmd.run"](cmd, python_shell=False)

    if not sorted(list(servers)) == get_servers():
        return False

    __salt__["service.restart"](service_name)
    return True


def get_servers():
    """
    Get list of configured NTP servers

    CLI Example:

    .. code-block:: bash

        salt '*' ntp.get_servers
    """
    cmd = ["w32tm", "/query", "/configuration"]
    lines = __salt__["cmd.run"](cmd, python_shell=False).splitlines()
    for line in lines:
        try:
            if line.startswith("NtpServer:"):
                _, ntpsvrs = line.rsplit(" (", 1)[0].split(":", 1)
                return sorted(ntpsvrs.split())
        except ValueError as e:
            return False
    return False