"""
Management of logs using Solaris logadm.

:maintainer:    Jorge Schrauwen <sjorge@blackdot.be>
:maturity:      new
:depends:       salt.modulus.logadm
:platform:      Oracle Solaris, Sun Solaris, illumos

.. versionadded:: 2017.7.0

.. code-block:: yaml

    .. note::
        TODO

"""

import logging

import salt.utils.args
import salt.utils.data

log = logging.getLogger(__name__)

# Define the state's virtual name
__virtualname__ = "logadm"


def __virtual__():
    """
    Provides logadm state if we have the module
    """
    if "logadm.list_conf" in __salt__:
        return True
    return (
        False,
        "{} state module can only if the logadm execution module is present".format(
            __virtualname__
        ),
    )


def rotate(name, **kwargs):
    """
    Add a log to the logadm configuration

    name : string
        alias for entryname

    kwargs : boolean|string|int
        optional additional flags and parameters

    """
    ret = {"name": name, "changes": {}, "result": None, "comment": ""}

    # cleanup kwargs
    kwargs = salt.utils.args.clean_kwargs(**kwargs)

    # inject name as entryname
    if "entryname" not in kwargs:
        kwargs["entryname"] = name

    # figure out log_file and entryname
    if "log_file" not in kwargs or not kwargs["log_file"]:
        if "entryname" in kwargs and kwargs["entryname"]:
            if kwargs["entryname"].startswith("/"):
                kwargs["log_file"] = kwargs["entryname"]

    # check for log_file
    if "log_file" not in kwargs or not kwargs["log_file"]:
        ret["result"] = False
        ret["comment"] = "Missing log_file attribute!"
    else:
        # lookup old configuration
        old_config = __salt__["logadm.list_conf"]()

        # remove existing entry
        if kwargs["log_file"] in old_config:
            res = __salt__["logadm.remove"](
                kwargs["entryname"] if "entryname" in kwargs else kwargs["log_file"]
            )
            ret["result"] = "Error" not in res
            if not ret["result"]:
                ret["comment"] = res["Error"]
                ret["changes"] = {}

        # add new entry
        res = __salt__["logadm.rotate"](name, **kwargs)
        ret["result"] = "Error" not in res
        if ret["result"]:
            new_config = __salt__["logadm.list_conf"]()
            ret["comment"] = "Log configuration {}".format(
                "updated" if kwargs["log_file"] in old_config else "added"
            )
            if kwargs["log_file"] in old_config:
                for key, val in salt.utils.data.compare_dicts(
                    old_config[kwargs["log_file"]], new_config[kwargs["log_file"]]
                ).items():
                    ret["changes"][key] = val["new"]
            else:
                ret["changes"] = new_config[kwargs["log_file"]]
            log.debug(ret["changes"])
        else:
            ret["comment"] = res["Error"]
            # NOTE: we need to remove the log file first
            #       potentially the log configuraiton can get lost :s
            if kwargs["log_file"] in old_config:
                ret["changes"] = {kwargs["log_file"]: None}
            else:
                ret["changes"] = {}

    return ret


def remove(name, log_file=None):
    """
    Remove a log from the logadm configuration

    name : string
        entryname
    log_file : string
        (optional) log file path

    .. note::
        If log_file is specified it will be used instead of the entry name.

    """
    ret = {"name": name, "changes": {}, "result": None, "comment": ""}

    # retrieve all log configuration
    config = __salt__["logadm.list_conf"]()

    # figure out log_file and name
    if not log_file:
        if name.startswith("/"):
            log_file = name
            name = None
        else:
            for log in config:
                if "entryname" in config[log] and config[log]["entryname"] == name:
                    log_file = config[log]["log_file"]
                    break
    if not name:
        for log in config:
            if "log_file" in config[log] and config[log]["log_file"] == log_file:
                if "entryname" in config[log]:
                    name = config[log]["entryname"]
                break

    # remove log if needed
    if log_file in config:
        res = __salt__["logadm.remove"](name if name else log_file)
        ret["result"] = "Error" not in res
        if ret["result"]:
            ret["comment"] = "Configuration for {} removed.".format(log_file)
            ret["changes"][log_file] = None
        else:
            ret["comment"] = res["Error"]
    else:
        ret["result"] = True
        ret["comment"] = "No configuration for {} present.".format(log_file)

    return ret
