#!/usr/bin/python
# Copyright (c) 2018, Dusty Mabe <dusty@dustymabe.com>
# Copyright (c) 2018, Ansible Project
# Copyright (c) 2021, Abhijeet Kasurde <akasurde@redhat.com>
# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
# SPDX-License-Identifier: GPL-3.0-or-later

from __future__ import annotations

DOCUMENTATION = r"""
module: rpm_ostree_pkg
short_description: Install or uninstall overlay additional packages
version_added: "2.0.0"
description:
  - Install or uninstall overlay additional packages using C(rpm-ostree) command.
extends_documentation_fragment:
  - community.general.attributes
attributes:
  check_mode:
    support: none
  diff_mode:
    support: none
options:
  name:
    description:
      - Name of overlay package to install or remove.
    required: true
    type: list
    elements: str
    aliases: [pkg]
  state:
    description:
      - State of the overlay package.
      - V(present) simply ensures that a desired package is installed.
      - V(absent) removes the specified package.
    choices: ['absent', 'present']
    default: 'present'
    type: str
  apply_live:
    description:
      - Adds the options C(--apply-live) when O(state=present).
      - Option is ignored when O(state=absent).
      - For more information, please see U(https://coreos.github.io/rpm-ostree/apply-live/).
    type: bool
    default: false
    version_added: 10.1.0
author:
  - Dusty Mabe (@dustymabe)
  - Abhijeet Kasurde (@Akasurde)
"""

EXAMPLES = r"""
- name: Install overlay package
  community.general.rpm_ostree_pkg:
    name: nfs-utils
    state: present

- name: Remove overlay package
  community.general.rpm_ostree_pkg:
    name: nfs-utils
    state: absent

- name: Apply the overlay package live
  community.general.rpm_ostree_pkg:
    name: nfs-utils
    state: present
    apply_live: true

# In case a different transaction is currently running the module would fail.
# Adding a delay can help mitigate this problem:
- name: Install overlay package
  community.general.rpm_ostree_pkg:
    name: nfs-utils
    state: present
  register: rpm_ostree_pkg
  until: rpm_ostree_pkg is not failed
  retries: 10
  delay: 30
"""

RETURN = r"""
action:
  description: Action performed.
  returned: always
  type: str
  sample: 'install'
packages:
  description: A list of packages specified.
  returned: always
  type: list
  sample: ["nfs-utils"]
cmd:
  description: Full command used for performed action.
  returned: always
  type: str
  sample: 'rpm-ostree uninstall --allow-inactive --idempotent --unchanged-exit-77 nfs-utils'
needs_reboot:
  description: Determine if machine needs a reboot to apply current changes.
  returned: success
  type: bool
  sample: true
  version_added: 10.1.0
"""

from ansible.module_utils.basic import AnsibleModule


class RpmOstreePkg:
    def __init__(self, module):
        self.module = module
        self.params = module.params
        self.state = module.params["state"]

    def ensure(self):
        results = dict(
            rc=0,
            changed=False,
            action="",
            packages=[],
            stdout="",
            stderr="",
            cmd="",
            needs_reboot=False,
        )

        # Ensure rpm-ostree command exists
        cmd = [self.module.get_bin_path("rpm-ostree", required=True)]

        # Decide action to perform
        if self.state == "present":
            results["action"] = "install"
            cmd.append("install")
        elif self.state == "absent":
            results["action"] = "uninstall"
            cmd.append("uninstall")

        # Add the options to the command line
        if self.params["apply_live"] and self.state == "present":
            cmd.extend(["--apply-live", "--assumeyes"])

        # Additional parameters
        cmd.extend(["--allow-inactive", "--idempotent", "--unchanged-exit-77"])
        for pkg in self.params["name"]:
            cmd.append(pkg)
            results["packages"].append(pkg)

        rc, out, err = self.module.run_command(cmd)

        # Determine if system needs a reboot to apply change
        if 'Changes queued for next boot. Run "systemctl reboot" to start a reboot' in out:
            results["needs_reboot"] = True

        results.update(
            dict(
                rc=rc,
                cmd=" ".join(cmd),
                stdout=out,
                stderr=err,
            )
        )

        # A few possible options:
        #     - rc=0  - succeeded in making a change
        #     - rc=77 - no change was needed
        #     - rc=?  - error
        if rc == 0:
            results["changed"] = True
        elif rc == 77:
            results["changed"] = False
            results["rc"] = 0
        else:
            self.module.fail_json(msg="non-zero return code", **results)

        self.module.exit_json(**results)


def main():
    module = AnsibleModule(
        argument_spec=dict(
            state=dict(default="present", choices=["absent", "present"]),
            name=dict(
                aliases=["pkg"],
                required=True,
                type="list",
                elements="str",
            ),
            apply_live=dict(
                type="bool",
                default=False,
            ),
        ),
    )

    rpm_ostree_pkg = RpmOstreePkg(module)
    rpm_ostree_pkg.ensure()


if __name__ == "__main__":
    main()