"""
Configuration disposable regularly scheduled tasks for at.
==========================================================

The at state can be add disposable regularly scheduled tasks for your system.
"""

import logging

log = logging.getLogger(__name__)


def __virtual__():
    """
    Most everything has the ability to support at(1)
    """
    if "at.at" in __salt__:
        return True
    return (False, "at module could not be loaded")


def present(name, timespec, tag=None, user=None, job=None, unique_tag=False):
    """
    .. versionchanged:: 2017.7.0

    Add a job to queue.

    job : string
        Command to run.

    timespec : string
        The 'timespec' follows the format documented in the at(1) manpage.

    tag : string
        Make a tag for the job.

    user : string
        The user to run the at job
        .. versionadded:: 2014.1.4

    unique_tag : boolean
        If set to True job will not be added if a job with the tag exists.
        .. versionadded:: 2017.7.0

    .. code-block:: yaml

        rose:
          at.present:
            - job: 'echo "I love saltstack" > love'
            - timespec: '9:09 11/09/13'
            - tag: love
            - user: jam

    """
    ret = {"name": name, "changes": {}, "result": True, "comment": ""}

    # if job is missing, use name
    if not job:
        job = name

    # quick return on test=True
    if __opts__["test"]:
        ret["result"] = None
        ret["comment"] = "job {} added and will run on {}".format(
            job,
            timespec,
        )
        return ret

    # quick return if unique_tag and job exists
    if unique_tag:
        if not tag:
            ret["result"] = False
            ret["comment"] = "no tag provided and unique_tag is set to True"
            return ret
        elif len(__salt__["at.jobcheck"](tag=tag)["jobs"]) > 0:
            ret["comment"] = "atleast one job with tag {tag} exists.".format(tag=tag)
            return ret

    # create job
    if user:
        luser = __salt__["user.info"](user)
        if not luser:
            ret["result"] = False
            ret["comment"] = "user {} does not exists".format(user)
            return ret
        ret["comment"] = "job {} added and will run as {} on {}".format(
            job,
            user,
            timespec,
        )
        res = __salt__["at.at"](
            timespec,
            job,
            tag=tag,
            runas=user,
        )
    else:
        ret["comment"] = "job {} added and will run on {}".format(
            job,
            timespec,
        )
        res = __salt__["at.at"](
            timespec,
            job,
            tag=tag,
        )

    # set ret['changes']
    if "jobs" in res and len(res["jobs"]) > 0:
        ret["changes"] = res["jobs"][0]
    if "error" in res:
        ret["result"] = False
        ret["comment"] = res["error"]

    return ret


def absent(name, jobid=None, **kwargs):
    """
    .. versionchanged:: 2017.7.0

    Remove a job from queue

    jobid: string|int
        Specific jobid to remove

    tag : string
        Job's tag

    runas : string
        Runs user-specified jobs

    kwargs
        Addition kwargs can be provided to filter jobs.
        See output of `at.jobcheck` for more.

    .. code-block:: yaml

        example1:
          at.absent:

    .. warning::
        this will remove all jobs!

    .. code-block:: yaml

        example2:
          at.absent:
            - year: 13

    .. code-block:: yaml

        example3:
          at.absent:
            - tag: rose

    .. code-block:: yaml

        example4:
          at.absent:
            - tag: rose
            - day: 13
            - hour: 16

    .. code-block:: yaml

        example5:
          at.absent:
            - jobid: 4

    .. note:
        all other filters are ignored and only job with id 4 is removed
    """
    ret = {"name": name, "changes": {}, "result": True, "comment": ""}

    # limit was never support
    if "limit" in kwargs:
        ret["comment"] = "limit parameter not supported {}".format(name)
        ret["result"] = False
        return ret

    # quick return on test=True
    if __opts__["test"]:
        ret["result"] = None
        ret["comment"] = "removed ? job(s)"
        return ret

    # remove specific job
    if jobid:
        jobs = __salt__["at.atq"](jobid)
        if "jobs" in jobs and len(jobs["jobs"]) == 0:
            ret["result"] = True
            ret["comment"] = "job with id {jobid} not present".format(jobid=jobid)
            return ret
        elif "jobs" in jobs and len(jobs["jobs"]) == 1:
            if "job" in jobs["jobs"][0] and jobs["jobs"][0]["job"]:
                res = __salt__["at.atrm"](jobid)
                ret["result"] = jobid in res["jobs"]["removed"]
                if ret["result"]:
                    ret["comment"] = "job with id {jobid} was removed".format(
                        jobid=jobid
                    )
                else:
                    ret["comment"] = "failed to remove job with id {jobid}".format(
                        jobid=jobid
                    )
                ret["changes"]["removed"] = res["jobs"]["removed"]
                return ret
        else:
            ret["result"] = False
            ret[
                "comment"
            ] = "more than one job was return for job with id {jobid}".format(
                jobid=jobid
            )
            return ret

    # remove jobs based on filter
    if kwargs:
        # we pass kwargs to at.jobcheck
        opts = list(
            list(
                map(str, [j["job"] for j in __salt__["at.jobcheck"](**kwargs)["jobs"]])
            )
        )
        res = __salt__["at.atrm"](*opts)
    else:
        # arguments to filter with, removing everything!
        res = __salt__["at.atrm"]("all")

    if len(res["jobs"]["removed"]) > 0:
        ret["changes"]["removed"] = res["jobs"]["removed"]
    ret["comment"] = "removed {count} job(s)".format(count=len(res["jobs"]["removed"]))
    return ret


def watch(name, timespec, tag=None, user=None, job=None, unique_tag=False):
    """
    .. versionadded:: 2017.7.0

    Add an at job if trigger by watch

    job : string
        Command to run.

    timespec : string
        The 'timespec' follows the format documented in the at(1) manpage.

    tag : string
        Make a tag for the job.

    user : string
        The user to run the at job
        .. versionadded:: 2014.1.4

    unique_tag : boolean
        If set to True job will not be added if a job with the tag exists.
        .. versionadded:: 2017.7.0

    .. code-block:: yaml

        minion_restart:
          at.watch:
            - job: 'salt-call --local service.restart salt-minion'
            - timespec: 'now +1 min'
            - tag: minion_restart
            - unique_tag: trye
            - watch:
                - file: /etc/salt/minion

    """
    return {"name": name, "changes": {}, "result": True, "comment": ""}


def mod_watch(name, **kwargs):
    """
    The at watcher, called to invoke the watch command.

    .. note::
        This state exists to support special handling of the ``watch``
        :ref:`requisite <requisites>`. It should not be called directly.

        Parameters for this function should be set by the state being triggered.

    name
        The name of the atjob

    """
    ret = {"name": name, "changes": {}, "result": False, "comment": ""}

    if kwargs["sfun"] == "watch":
        for p in ["sfun", "__reqs__"]:
            del kwargs[p]
        kwargs["name"] = name
        ret = present(**kwargs)

    return ret


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