#!/usr/bin/python

# Copyright (c) 2024, Zoran Krleza (zoran.krleza@true-north.hr)
# Based on code:
# Copyright (c) 2019, Guillaume Martinez (lunik@tiwabbit.fr)
# Copyright (c) 2018, Marcus Watkins <marwatk@marcuswatkins.net>
# Copyright (c) 2013, Phillip Gentry <phillip@cx.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: gitlab_project_access_token
short_description: Manages GitLab project access tokens
version_added: 8.4.0
description:
  - Creates and revokes project access tokens.
author:
  - Zoran Krleza (@pixslx)
requirements:
  - python-gitlab >= 3.1.0
extends_documentation_fragment:
  - community.general.auth_basic
  - community.general.gitlab
  - community.general.attributes
notes:
  - Access tokens can not be changed. If a parameter needs to be changed, an acceess token has to be recreated. Whether tokens
    are recreated or not is controlled by the O(recreate) option, which defaults to V(never).
  - Token string is contained in the result only when access token is created or recreated. It can not be fetched afterwards.
  - Token matching is done by comparing O(name) option.
attributes:
  check_mode:
    support: full
  diff_mode:
    support: none

options:
  project:
    description:
      - ID or full path of project in the form of group/name.
    required: true
    type: str
  name:
    description:
      - Access token's name.
    required: true
    type: str
  scopes:
    description:
      - Scope of the access token.
      - The values V(manage_runner) and V(self_rotate) were added in community.general 11.3.0.
    required: true
    type: list
    elements: str
    aliases: ["scope"]
    choices:
      - api
      - read_api
      - read_registry
      - write_registry
      - read_repository
      - write_repository
      - create_runner
      - manage_runner
      - ai_features
      - k8s_proxy
      - self_rotate
  access_level:
    description:
      - Access level of the access token.
      - The value V(planner) was added in community.general 11.3.0.
    type: str
    default: maintainer
    choices: ["guest", "planner", "reporter", "developer", "maintainer", "owner"]
  expires_at:
    description:
      - Expiration date of the access token in C(YYYY-MM-DD) format.
      - Make sure to quote this value in YAML to ensure it is kept as a string and not interpreted as a YAML date.
    type: str
    required: true
  recreate:
    description:
      - Whether the access token is recreated if it already exists.
      - When V(never) the token is never recreated.
      - When V(always) the token is always recreated.
      - When V(state_change) the token is recreated if there is a difference between desired state and actual state.
    type: str
    choices: ["never", "always", "state_change"]
    default: never
  state:
    description:
      - When V(present) the access token is added to the project if it does not exist.
      - When V(absent) it is removed from the project if it exists.
    default: present
    type: str
    choices: ["present", "absent"]
"""

EXAMPLES = r"""
- name: "Creating a project access token"
  community.general.gitlab_project_access_token:
    api_url: https://gitlab.example.com/
    api_token: "somegitlabapitoken"
    project: "my_group/my_project"
    name: "project_token"
    expires_at: "2024-12-31"
    access_level: developer
    scopes:
      - api
      - read_api
      - read_repository
      - write_repository
    state: present

- name: "Revoking a project access token"
  community.general.gitlab_project_access_token:
    api_url: https://gitlab.example.com/
    api_token: "somegitlabapitoken"
    project: "my_group/my_project"
    name: "project_token"
    expires_at: "2024-12-31"
    scopes:
      - api
      - read_api
      - read_repository
      - write_repository
    state: absent

- name: "Change (recreate) existing token if its actual state is different than desired state"
  community.general.gitlab_project_access_token:
    api_url: https://gitlab.example.com/
    api_token: "somegitlabapitoken"
    project: "my_group/my_project"
    name: "project_token"
    expires_at: "2024-12-31"
    scopes:
      - api
      - read_api
      - read_repository
      - write_repository
    recreate: state_change
    state: present
"""

RETURN = r"""
access_token:
  description:
    - API object.
    - Only contains the value of the token if the token was created or recreated.
  returned: success and O(state=present)
  type: dict
"""

from datetime import datetime

from ansible.module_utils.api import basic_auth_argument_spec
from ansible.module_utils.basic import AnsibleModule

from ansible_collections.community.general.plugins.module_utils.gitlab import (
    auth_argument_spec,
    find_project,
    gitlab_authentication,
    gitlab,
)

ACCESS_LEVELS = dict(guest=10, planner=15, reporter=20, developer=30, maintainer=40, owner=50)


class GitLabProjectAccessToken:
    def __init__(self, module, gitlab_instance):
        self._module = module
        self._gitlab = gitlab_instance
        self.access_token_object = None

    """
    @param project Project Object
    @param arguments Attributes of the access_token
    """

    def create_access_token(self, project, arguments):
        changed = False
        if self._module.check_mode:
            return True

        try:
            self.access_token_object = project.access_tokens.create(arguments)
            changed = True
        except gitlab.exceptions.GitlabCreateError as e:
            self._module.fail_json(msg=f"Failed to create access token: {e}")

        return changed

    """
    @param project Project object
    @param name of the access token
    """

    def find_access_token(self, project, name):
        access_tokens = [x for x in project.access_tokens.list(all=True) if not getattr(x, "revoked", False)]
        for access_token in access_tokens:
            if access_token.name == name:
                self.access_token_object = access_token
                return False
        return False

    def revoke_access_token(self):
        if self._module.check_mode:
            return True

        changed = False
        try:
            self.access_token_object.delete()
            changed = True
        except gitlab.exceptions.GitlabCreateError as e:
            self._module.fail_json(msg=f"Failed to revoke access token: {e}")

        return changed

    def access_tokens_equal(self):
        if self.access_token_object.name != self._module.params["name"]:
            return False
        if self.access_token_object.scopes != self._module.params["scopes"]:
            return False
        if self.access_token_object.access_level != ACCESS_LEVELS[self._module.params["access_level"]]:
            return False
        if self.access_token_object.expires_at != self._module.params["expires_at"]:
            return False
        return True


def main():
    argument_spec = basic_auth_argument_spec()
    argument_spec.update(auth_argument_spec())
    argument_spec.update(
        dict(
            state=dict(type="str", default="present", choices=["absent", "present"]),
            project=dict(type="str", required=True),
            name=dict(type="str", required=True),
            scopes=dict(
                type="list",
                required=True,
                aliases=["scope"],
                elements="str",
                choices=[
                    "api",
                    "read_api",
                    "read_registry",
                    "write_registry",
                    "read_repository",
                    "write_repository",
                    "create_runner",
                    "manage_runner",
                    "ai_features",
                    "k8s_proxy",
                    "self_rotate",
                ],
            ),
            access_level=dict(
                type="str",
                default="maintainer",
                choices=["guest", "planner", "reporter", "developer", "maintainer", "owner"],
            ),
            expires_at=dict(type="str", required=True),
            recreate=dict(type="str", default="never", choices=["never", "always", "state_change"]),
        )
    )

    module = AnsibleModule(
        argument_spec=argument_spec,
        mutually_exclusive=[
            ["api_username", "api_token"],
            ["api_username", "api_oauth_token"],
            ["api_username", "api_job_token"],
            ["api_token", "api_oauth_token"],
            ["api_token", "api_job_token"],
        ],
        required_together=[["api_username", "api_password"]],
        required_one_of=[["api_username", "api_token", "api_oauth_token", "api_job_token"]],
        supports_check_mode=True,
    )

    state = module.params["state"]
    project_identifier = module.params["project"]
    name = module.params["name"]
    scopes = module.params["scopes"]
    access_level_str = module.params["access_level"]
    expires_at = module.params["expires_at"]
    recreate = module.params["recreate"]

    access_level = ACCESS_LEVELS[access_level_str]

    try:
        datetime.strptime(expires_at, "%Y-%m-%d")
    except ValueError:
        module.fail_json(msg="Argument expires_at is not in required format YYYY-MM-DD")

    gitlab_instance = gitlab_authentication(module)

    gitlab_access_token = GitLabProjectAccessToken(module, gitlab_instance)

    project = find_project(gitlab_instance, project_identifier)
    if project is None:
        module.fail_json(msg=f"Failed to create access token: project {project_identifier} does not exists")

    gitlab_access_token_exists = False
    gitlab_access_token.find_access_token(project, name)
    if gitlab_access_token.access_token_object is not None:
        gitlab_access_token_exists = True

    if state == "absent":
        if gitlab_access_token_exists:
            gitlab_access_token.revoke_access_token()
            module.exit_json(changed=True, msg=f"Successfully deleted access token {name}")
        else:
            module.exit_json(changed=False, msg="Access token does not exists")

    if state == "present":
        if gitlab_access_token_exists:
            if gitlab_access_token.access_tokens_equal():
                if recreate == "always":
                    gitlab_access_token.revoke_access_token()
                    gitlab_access_token.create_access_token(
                        project,
                        {"name": name, "scopes": scopes, "access_level": access_level, "expires_at": expires_at},
                    )
                    module.exit_json(
                        changed=True,
                        msg="Successfully recreated access token",
                        access_token=gitlab_access_token.access_token_object._attrs,
                    )
                else:
                    module.exit_json(
                        changed=False,
                        msg="Access token already exists",
                        access_token=gitlab_access_token.access_token_object._attrs,
                    )
            else:
                if recreate == "never":
                    module.fail_json(
                        msg="Access token already exists and its state is different. It can not be updated without recreating."
                    )
                else:
                    gitlab_access_token.revoke_access_token()
                    gitlab_access_token.create_access_token(
                        project,
                        {"name": name, "scopes": scopes, "access_level": access_level, "expires_at": expires_at},
                    )
                    module.exit_json(
                        changed=True,
                        msg="Successfully recreated access token",
                        access_token=gitlab_access_token.access_token_object._attrs,
                    )
        else:
            gitlab_access_token.create_access_token(
                project, {"name": name, "scopes": scopes, "access_level": access_level, "expires_at": expires_at}
            )
            if module.check_mode:
                module.exit_json(changed=True, msg="Successfully created access token", access_token={})
            else:
                module.exit_json(
                    changed=True,
                    msg="Successfully created access token",
                    access_token=gitlab_access_token.access_token_object._attrs,
                )


if __name__ == "__main__":
    main()