#!/usr/bin/python

# Copyright (c) 2023, Benedikt Braunger (bebr@adm.ku.dk)
# Based on code:
# Copyright (c) 2020, Florent Madiot (scodeman@scode.io)
# Copyright (c) 2019, Markus Bergholz (markuman@gmail.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_instance_variable
short_description: Creates, updates, or deletes GitLab instance variables
version_added: 7.1.0
description:
  - Creates a instance variable if it does not exist.
  - When a instance variable does exist, its value is updated if the values are different.
  - Support for instance variables requires GitLab >= 13.0.
  - Variables which are not mentioned in the modules options, but are present on the GitLab instance, either stay (O(purge=false))
    or are deleted (O(purge=true)).
author:
  - Benedikt Braunger (@benibr)
requirements:
  - python-gitlab python module
extends_documentation_fragment:
  - community.general.auth_basic
  - community.general.gitlab
  - community.general.attributes

attributes:
  check_mode:
    support: full
  diff_mode:
    support: none

options:
  state:
    description:
      - Create or delete instance variable.
    default: present
    type: str
    choices: ["present", "absent"]
  purge:
    description:
      - When set to V(true), delete all variables which are not mentioned in the task.
    default: false
    type: bool
  variables:
    description:
      - A list of dictionaries that represents CI/CD variables.
    default: []
    type: list
    elements: dict
    suboptions:
      name:
        description:
          - The name of the variable.
        type: str
        required: true
      value:
        description:
          - The variable value.
          - Required when O(state=present).
        type: str
      description:
        description:
          - A description for the variable.
          - Support for descriptions requires GitLab >= 16.8.
        type: str
        version_added: '11.4.0'
      masked:
        description:
          - Whether variable value is masked or not.
        type: bool
        default: false
      protected:
        description:
          - Whether variable value is protected or not.
        type: bool
        default: false
      raw:
        description:
          - Whether variable value is raw or not.
          - Support for raw values requires GitLab >= 15.7.
        type: bool
        default: false
        version_added: 10.2.0
      variable_type:
        description:
          - Whether a variable is an environment variable (V(env_var)) or a file (V(file)).
        type: str
        choices: ["env_var", "file"]
        default: env_var
"""


EXAMPLES = r"""
- name: Set or update some CI/CD variables
  community.general.gitlab_instance_variable:
    api_url: https://gitlab.com
    api_token: secret_access_token
    purge: false
    variables:
      - name: ACCESS_KEY_ID
        value: abc1312cba
      - name: SECRET_ACCESS_KEY
        value: 1337
        masked: true
        protected: true
        variable_type: env_var

- name: Delete one variable
  community.general.gitlab_instance_variable:
    api_url: https://gitlab.com
    api_token: secret_access_token
    state: absent
    variables:
      - name: ACCESS_KEY_ID
"""

RETURN = r"""
instance_variable:
  description: Four lists of the variablenames which were added, updated, removed or exist.
  returned: always
  type: dict
  contains:
    added:
      description: A list of variables which were created.
      returned: always
      type: list
      sample: ["ACCESS_KEY_ID", "SECRET_ACCESS_KEY"]
    untouched:
      description: A list of variables which exist.
      returned: always
      type: list
      sample: ["ACCESS_KEY_ID", "SECRET_ACCESS_KEY"]
    removed:
      description: A list of variables which were deleted.
      returned: always
      type: list
      sample: ["ACCESS_KEY_ID", "SECRET_ACCESS_KEY"]
    updated:
      description: A list pre-existing variables whose values have been set.
      returned: always
      type: list
      sample: ["ACCESS_KEY_ID", "SECRET_ACCESS_KEY"]
"""

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,
    filter_returned_variables,
    gitlab_authentication,
    list_all_kwargs,
)


class GitlabInstanceVariables:
    def __init__(self, module, gitlab_instance):
        self.instance = gitlab_instance
        self._module = module

    def list_all_instance_variables(self):
        return list(self.instance.variables.list(**list_all_kwargs))

    def create_variable(self, var_obj):
        if self._module.check_mode:
            return True
        var = {
            "key": var_obj.get("key"),
            "value": var_obj.get("value"),
            "description": var_obj.get("description"),
            "masked": var_obj.get("masked"),
            "protected": var_obj.get("protected"),
            "raw": var_obj.get("raw"),
            "variable_type": var_obj.get("variable_type"),
        }

        self.instance.variables.create(var)
        return True

    def update_variable(self, var_obj):
        if self._module.check_mode:
            return True
        self.delete_variable(var_obj)
        self.create_variable(var_obj)
        return True

    def delete_variable(self, var_obj):
        if self._module.check_mode:
            return True
        self.instance.variables.delete(var_obj.get("key"))
        return True


def compare(requested_variables, existing_variables, state):
    # we need to do this, because it was determined in a previous version - more or less buggy
    # basically it is not necessary and might results in more/other bugs!
    # but it is required and only relevant for check mode!!
    # logic represents state 'present' when not purge. all other can be derived from that
    # untouched => equal in both
    # updated => name and scope are equal
    # added => name and scope does not exist
    untouched = list()
    updated = list()
    added = list()

    if state == "present":
        existing_key_scope_vars = list()
        for item in existing_variables:
            existing_key_scope_vars.append({"key": item.get("key")})

        for var in requested_variables:
            if var in existing_variables:
                untouched.append(var)
            else:
                compare_item = {"key": var.get("name")}
                if compare_item in existing_key_scope_vars:
                    updated.append(var)
                else:
                    added.append(var)

    return untouched, updated, added


def native_python_main(this_gitlab, purge, requested_variables, state, module):
    change = False
    return_value = dict(added=list(), updated=list(), removed=list(), untouched=list())

    gitlab_keys = this_gitlab.list_all_instance_variables()
    before = [x.attributes for x in gitlab_keys]

    existing_variables = filter_returned_variables(gitlab_keys)

    for item in requested_variables:
        item["key"] = item.pop("name")
        item["value"] = str(item.get("value"))
        if item.get("protected") is None:
            item["protected"] = False
        if item.get("masked") is None:
            item["masked"] = False
        if item.get("raw") is None:
            item["raw"] = False
        if item.get("variable_type") is None:
            item["variable_type"] = "env_var"

    if module.check_mode:
        untouched, updated, added = compare(requested_variables, existing_variables, state)

    if state == "present":
        add_or_update = [x for x in requested_variables if x not in existing_variables]
        for item in add_or_update:
            try:
                if this_gitlab.create_variable(item):
                    return_value["added"].append(item)

            except Exception:
                if this_gitlab.update_variable(item):
                    return_value["updated"].append(item)

        if purge:
            # refetch and filter
            gitlab_keys = this_gitlab.list_all_instance_variables()
            existing_variables = filter_returned_variables(gitlab_keys)

            remove = [x for x in existing_variables if x not in requested_variables]
            for item in remove:
                if this_gitlab.delete_variable(item):
                    return_value["removed"].append(item)

    elif state == "absent":
        # value, type, and description do not matter on removing variables.
        keys_ignored_on_deletion = ["value", "variable_type", "description"]
        for key in keys_ignored_on_deletion:
            for item in existing_variables:
                item.pop(key)
            for item in requested_variables:
                item.pop(key)

        if not purge:
            remove_requested = [x for x in requested_variables if x in existing_variables]
            for item in remove_requested:
                if this_gitlab.delete_variable(item):
                    return_value["removed"].append(item)

        else:
            for item in existing_variables:
                if this_gitlab.delete_variable(item):
                    return_value["removed"].append(item)

    if module.check_mode:
        return_value = dict(added=added, updated=updated, removed=return_value["removed"], untouched=untouched)

    if len(return_value["added"] + return_value["removed"] + return_value["updated"]) > 0:
        change = True

    gitlab_keys = this_gitlab.list_all_instance_variables()
    after = [x.attributes for x in gitlab_keys]

    return change, return_value, before, after


def main():
    argument_spec = basic_auth_argument_spec()
    argument_spec.update(auth_argument_spec())
    argument_spec.update(
        purge=dict(type="bool", default=False),
        variables=dict(
            type="list",
            elements="dict",
            default=list(),
            options=dict(
                name=dict(type="str", required=True),
                value=dict(type="str", no_log=True),
                description=dict(type="str"),
                masked=dict(type="bool", default=False),
                protected=dict(type="bool", default=False),
                raw=dict(type="bool", default=False),
                variable_type=dict(type="str", default="env_var", choices=["env_var", "file"]),
            ),
        ),
        state=dict(type="str", default="present", choices=["absent", "present"]),
    )

    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,
    )

    # check prerequisites and connect to gitlab server
    gitlab_instance = gitlab_authentication(module)

    purge = module.params["purge"]
    state = module.params["state"]

    variables = module.params["variables"]

    if state == "present":
        if any(x["value"] is None for x in variables):
            module.fail_json(msg="value parameter is required in state present")

    this_gitlab = GitlabInstanceVariables(module=module, gitlab_instance=gitlab_instance)

    changed, raw_return_value, before, after = native_python_main(this_gitlab, purge, variables, state, module)

    # postprocessing
    for item in after:
        item["name"] = item.pop("key")
    for item in before:
        item["name"] = item.pop("key")

    untouched_key_name = "key"
    if not module.check_mode:
        untouched_key_name = "name"
        raw_return_value["untouched"] = [x for x in before if x in after]

    added = [x.get("key") for x in raw_return_value["added"]]
    updated = [x.get("key") for x in raw_return_value["updated"]]
    removed = [x.get("key") for x in raw_return_value["removed"]]
    untouched = [x.get(untouched_key_name) for x in raw_return_value["untouched"]]
    return_value = dict(added=added, updated=updated, removed=removed, untouched=untouched)

    module.exit_json(changed=changed, instance_variable=return_value)


if __name__ == "__main__":
    main()