# Copyright: (c) 2015, Ansible Inc,
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)

from __future__ import absolute_import, division, print_function

__metaclass__ = type

import copy

from ansible.errors import AnsibleError
from ansible.plugins.action import ActionBase
from ansible.utils.display import Display

display = Display()


class ActionModule(ActionBase):
    def run(self, tmp=None, task_vars=None):
        del tmp  # tmp no longer has any effect

        result = {}
        play_context = copy.deepcopy(self._play_context)
        play_context.network_os = self._get_network_os(task_vars)
        new_task = self._task.copy()

        module = self._get_implementation_module(
            play_context.network_os, self._task.action
        )
        if not module:
            if self._task.args["fail_on_missing_module"]:
                result["failed"] = True
            else:
                result["failed"] = False

            result["msg"] = (
                "Could not find implementation module %s for %s"
                % (self._task.action, play_context.network_os)
            )
            return result

        new_task.action = module

        action = self._shared_loader_obj.action_loader.get(
            play_context.network_os,
            task=new_task,
            connection=self._connection,
            play_context=play_context,
            loader=self._loader,
            templar=self._templar,
            shared_loader_obj=self._shared_loader_obj,
        )
        display.vvvv("Running implementation module %s" % module)
        return action.run(task_vars=task_vars)

    def _get_network_os(self, task_vars):
        if "network_os" in self._task.args and self._task.args["network_os"]:
            display.vvvv("Getting network OS from task argument")
            network_os = self._task.args["network_os"]
        elif self._play_context.network_os:
            display.vvvv("Getting network OS from inventory")
            network_os = self._play_context.network_os
        elif (
            "network_os" in task_vars.get("ansible_facts", {})
            and task_vars["ansible_facts"]["network_os"]
        ):
            display.vvvv("Getting network OS from fact")
            network_os = task_vars["ansible_facts"]["network_os"]
        else:
            raise AnsibleError(
                "ansible_network_os must be specified on this host to use platform agnostic modules"
            )

        return network_os

    def _get_implementation_module(self, network_os, platform_agnostic_module):
        module_name = (
            network_os.split(".")[-1]
            + "_"
            + platform_agnostic_module.partition("_")[2]
        )
        if "." in network_os:
            fqcn_module = ".".join(network_os.split(".")[0:-1])
            implementation_module = fqcn_module + "." + module_name
        else:
            implementation_module = module_name

        if implementation_module not in self._shared_loader_obj.module_loader:
            implementation_module = None

        return implementation_module