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"""
Support for eselect, Gentoo's configuration and management tool.
"""

import logging

import salt.utils.path

log = logging.getLogger(__name__)


def __virtual__():
    """
    Only work on Gentoo systems with eselect installed
    """
    if __grains__["os"] == "Gentoo" and salt.utils.path.which("eselect"):
        return "eselect"
    return (
        False,
        "The eselect execution module cannot be loaded: either the system is not Gentoo"
        " or the eselect binary is not in the path.",
    )


def exec_action(
    module, action, module_parameter=None, action_parameter=None, state_only=False
):
    """
    Execute an arbitrary action on a module.

    module
        name of the module to be executed

    action
        name of the module's action to be run

    module_parameter
        additional params passed to the defined module

    action_parameter
        additional params passed to the defined action

    state_only
        don't return any output but only the success/failure of the operation

    CLI Example (updating the ``php`` implementation used for ``apache2``):

    .. code-block:: bash

        salt '*' eselect.exec_action php update action_parameter='apache2'
    """
    out = __salt__["cmd.run"](
        "eselect --brief --colour=no {} {} {} {}".format(
            module, module_parameter or "", action, action_parameter or ""
        ),
        python_shell=False,
    )
    out = out.strip().split("\n")

    if out[0].startswith("!!! Error"):
        return False

    if state_only:
        return True

    if not out:
        return False

    if len(out) == 1 and not out[0].strip():
        return False

    return out


def get_modules():
    """
    List available ``eselect`` modules.

    CLI Example:

    .. code-block:: bash

        salt '*' eselect.get_modules
    """
    modules = []
    module_list = exec_action("modules", "list", action_parameter="--only-names")
    if not module_list:
        return None

    for module in module_list:
        if module not in ["help", "usage", "version"]:
            modules.append(module)
    return modules


def get_target_list(module, action_parameter=None):
    """
    List available targets for the given module.

    module
        name of the module to be queried for its targets

    action_parameter
        additional params passed to the defined action

        .. versionadded:: 2016.11.0

    CLI Example:

    .. code-block:: bash

        salt '*' eselect.get_target_list kernel
    """
    exec_output = exec_action(module, "list", action_parameter=action_parameter)
    if not exec_output:
        return None

    target_list = []
    if isinstance(exec_output, list):
        for item in exec_output:
            target_list.append(item.split(None, 1)[0])
        return target_list

    return None


def get_current_target(module, module_parameter=None, action_parameter=None):
    """
    Get the currently selected target for the given module.

    module
        name of the module to be queried for its current target

    module_parameter
        additional params passed to the defined module

    action_parameter
        additional params passed to the 'show' action

    CLI Example (current target of system-wide ``java-vm``):

    .. code-block:: bash

        salt '*' eselect.get_current_target java-vm action_parameter='system'

    CLI Example (current target of ``kernel`` symlink):

    .. code-block:: bash

        salt '*' eselect.get_current_target kernel
    """
    result = exec_action(
        module,
        "show",
        module_parameter=module_parameter,
        action_parameter=action_parameter,
    )[0]
    if not result:
        return None

    if result == "(unset)":
        return None

    return result


def set_target(module, target, module_parameter=None, action_parameter=None):
    """
    Set the target for the given module.
    Target can be specified by index or name.

    module
        name of the module for which a target should be set

    target
        name of the target to be set for this module

    module_parameter
        additional params passed to the defined module

    action_parameter
        additional params passed to the defined action

    CLI Example (setting target of system-wide ``java-vm``):

    .. code-block:: bash

        salt '*' eselect.set_target java-vm icedtea-bin-7 action_parameter='system'

    CLI Example (setting target of ``kernel`` symlink):

    .. code-block:: bash

        salt '*' eselect.set_target kernel linux-3.17.5-gentoo
    """
    if action_parameter:
        action_parameter = f"{action_parameter} {target}"
    else:
        action_parameter = target

    # get list of available modules
    if module not in get_modules():
        log.error("Module %s not available", module)
        return False

    exec_result = exec_action(
        module,
        "set",
        module_parameter=module_parameter,
        action_parameter=action_parameter,
        state_only=True,
    )
    if exec_result:
        return exec_result
    return False