#!/usr/bin/python3
import pathlib
from typing import List, Optional

from ansible_module.generic import SYSTEMD_SERVICE_CONFIG, Types, modspec
from ansible_module.module import SystemdReloadMixin, SystemdUnitModule, installable

SYSTEMD_SERVICE_CONFIG = pathlib.Path("/etc/systemd/system")

OPTION_MAPPING = dict(
    required_by="RequiredBy",
    wanted_by="WantedBy",
)


@installable
class Module(SystemdUnitModule, SystemdReloadMixin):  # type: ignore
    """Creates an systemd mount"""

    name = "mount"
    module_spec = modspec(
        argument_spec=dict(
            fs=Types.str(required=True, help="The filesystem that is used for the mount"),
            where=Types.path(required=True, help="The Path where the filesystem is mounted to"),
            what=Types.str(required=True, help="The device or an string that will be mounted"),
            state=Types.str(
                choices=("present", "absent"),
                default="present",
                help="the state the mount is",
            ),
            options=Types.list(elements=str, help="The options for the mount"),
        ),
    )

    def prepare(self):
        self.mountdir = pathlib.Path(self.params["where"])
        self.unitfile = SYSTEMD_SERVICE_CONFIG.joinpath(self.mountdir.relative_to("/").as_posix().replace("/", "-")).with_suffix(".mount")
        self.__unit = None
        if self.get("description", False) is False:
            self.params["description"] = "Mount for {}".format(self.mountdir.as_posix())

    def unit(self) -> str:
        if self.__unit is None:
            self.__unit = "\n".join(
                (
                    self.header(),
                    self.mount(),
                    self.install(),
                )
            )
        return self.__unit

    def header(self) -> str:
        return "[Unit]\nDescription={}\n".format(self.get("description", "Mount for {}".format(self.get("where"))))

    def mount(self) -> str:
        output = "[Mount]\n"
        output += "Where={}\n".format(self.get("where"))
        output += "What={}\n".format(self.get("what"))
        output += "Type={}\n".format(self.get("fs"))
        if self.get("options", False):
            output += "Options={}\n".format(",".join(self.get("options")))
        return output


DOCUMENTATION = """---
description:
- Creates an systemd mount
module: mount
options:
  after:
    default: []
    description:
    - list of units that this unit wants to be started after this unit
    elements: str
    required: false
    type: list
  before:
    default: []
    description:
    - list of units that this unit needs to be started before this unit.
    elements: str
    required: false
    type: list
  description:
    description:
    - An description for programs that access systemd
    required: false
    type: str
  documentation:
    default: []
    description:
    - Paths where documentation can be found
    elements: str
    required: false
    type: list
  fs:
    description:
    - The filesystem that is used for the mount
    required: true
    type: str
  options:
    default: []
    description:
    - The options for the mount
    elements: str
    required: false
    type: list
  partof:
    default: []
    description:
    - list of units that this unit is part of.
    - If the restart this unit does it too, but if this restarts it does not affect
      the other units.
    elements: str
    required: false
    type: list
  required_by:
    default: []
    description:
    - systemd units that require this mount
    elements: str
    required: false
    type: list
  requires:
    default: []
    description:
    - list of units that this unit requires. If it fails or can't be started this
      unit fails. without before/after this is started at the same time
    elements: str
    required: false
    type: list
  state:
    choices:
    - present
    - absent
    default: present
    description:
    - the state the mount is
    required: false
    type: str
  wanted_by:
    default: []
    description:
    - systemd units that want the mount, but not explicitly require it. Commonly used
      for target if not service explicitly require it.
    elements: str
    required: false
    type: list
  wants:
    default: []
    description:
    - list of units that this unit wants. If it fails or can't be started it does
      not affect this unit
    elements: str
    required: false
    type: list
  what:
    description:
    - The device or an string that will be mounted
    required: true
    type: str
  where:
    description:
    - The Path where the filesystem is mounted to
    required: true
    type: path
short_description: Creates an systemd mount
"""

if __name__ == "__main__":
    Module()()