#!/usr/bin/python

# -*- coding: utf-8 -*-
# Copyright: (c) 2018, Ansible Project
# 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


DOCUMENTATION = '''
---
module: iam_user_info
version_added: 1.0.0
short_description: Gather IAM user(s) facts in AWS
description:
  - This module can be used to gather IAM user(s) facts in AWS.
author:
  - Constantin Bugneac (@Constantin07)
  - Abhijeet Kasurde (@Akasurde)
options:
  name:
    description:
     - The name of the IAM user to look for.
    required: false
    type: str
  group:
    description:
     - The group name name of the IAM user to look for. Mutually exclusive with C(path).
    required: false
    type: str
  path:
    description:
     - The path to the IAM user. Mutually exclusive with C(group).
     - If specified, then would get all user names whose path starts with user provided value.
    required: false
    default: '/'
    type: str
extends_documentation_fragment:
- amazon.aws.aws
- amazon.aws.ec2

'''

EXAMPLES = r'''
# Note: These examples do not set authentication details, see the AWS Guide for details.
# Gather facts about "test" user.
- name: Get IAM user info
  community.aws.iam_user_info:
    name: "test"

# Gather facts about all users in the "dev" group.
- name: Get IAM user info
  community.aws.iam_user_info:
    group: "dev"

# Gather facts about all users with "/division_abc/subdivision_xyz/" path.
- name: Get IAM user info
  community.aws.iam_user_info:
    path: "/division_abc/subdivision_xyz/"
'''

RETURN = r'''
iam_users:
    description: list of maching iam users
    returned: success
    type: complex
    contains:
        arn:
            description: the ARN of the user
            returned: if user exists
            type: str
            sample: "arn:aws:iam::156360693172:user/dev/test_user"
        create_date:
            description: the datetime user was created
            returned: if user exists
            type: str
            sample: "2016-05-24T12:24:59+00:00"
        password_last_used:
            description: the last datetime the password was used by user
            returned: if password was used at least once
            type: str
            sample: "2016-05-25T13:39:11+00:00"
        path:
            description: the path to user
            returned: if user exists
            type: str
            sample: "/dev/"
        user_id:
            description: the unique user id
            returned: if user exists
            type: str
            sample: "AIDUIOOCQKTUGI6QJLGH2"
        user_name:
            description: the user name
            returned: if user exists
            type: str
            sample: "test_user"
        tags:
            description: User tags.
            type: dict
            returned: if user exists
            sample: '{"Env": "Prod"}'
'''

try:
    from botocore.exceptions import BotoCoreError, ClientError
except ImportError:
    pass  # caught by AnsibleAWSModule

from ansible.module_utils.common.dict_transformations import camel_dict_to_snake_dict

from ansible_collections.amazon.aws.plugins.module_utils.core import AnsibleAWSModule
from ansible_collections.amazon.aws.plugins.module_utils.core import is_boto3_error_code
from ansible_collections.amazon.aws.plugins.module_utils.ec2 import AWSRetry
from ansible_collections.amazon.aws.plugins.module_utils.ec2 import boto3_tag_list_to_ansible_dict


@AWSRetry.exponential_backoff()
def list_iam_users_with_backoff(client, operation, **kwargs):
    paginator = client.get_paginator(operation)
    return paginator.paginate(**kwargs).build_full_result()


def describe_iam_user(user):
    tags = boto3_tag_list_to_ansible_dict(user.pop('Tags', []))
    user = camel_dict_to_snake_dict(user)
    user['tags'] = tags
    return user


def list_iam_users(connection, module):

    name = module.params.get('name')
    group = module.params.get('group')
    path = module.params.get('path')

    params = dict()
    iam_users = []

    if not group and not path:
        if name:
            params['UserName'] = name
        try:
            iam_users.append(connection.get_user(**params)['User'])
        except is_boto3_error_code('NoSuchEntity'):
            pass
        except (ClientError, BotoCoreError) as e:  # pylint: disable=duplicate-except
            module.fail_json_aws(e, msg="Couldn't get IAM user info for user %s" % name)

    if group:
        params['GroupName'] = group
        try:
            iam_users = list_iam_users_with_backoff(connection, 'get_group', **params)['Users']
        except is_boto3_error_code('NoSuchEntity'):
            pass
        except (ClientError, BotoCoreError) as e:  # pylint: disable=duplicate-except
            module.fail_json_aws(e, msg="Couldn't get IAM user info for group %s" % group)
        if name:
            iam_users = [user for user in iam_users if user['UserName'] == name]

    if path and not group:
        params['PathPrefix'] = path
        try:
            iam_users = list_iam_users_with_backoff(connection, 'list_users', **params)['Users']
        except is_boto3_error_code('NoSuchEntity'):
            pass
        except (ClientError, BotoCoreError) as e:  # pylint: disable=duplicate-except
            module.fail_json_aws(e, msg="Couldn't get IAM user info for path %s" % path)
        if name:
            iam_users = [user for user in iam_users if user['UserName'] == name]

    module.exit_json(iam_users=[describe_iam_user(user) for user in iam_users])


def main():
    argument_spec = dict(
        name=dict(),
        group=dict(),
        path=dict(default='/')
    )

    module = AnsibleAWSModule(
        argument_spec=argument_spec,
        mutually_exclusive=[
            ['group', 'path']
        ],
        supports_check_mode=True
    )

    connection = module.client('iam')

    list_iam_users(connection, module)


if __name__ == '__main__':
    main()
