#!/usr/bin/python
# Copyright: 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: ec2_ami_info
version_added: 1.0.0
short_description: Gather information about ec2 AMIs
description:
  - Gather information about ec2 AMIs
author:
  - Prasad Katti (@prasadkatti)
options:
  image_ids:
    description: One or more image IDs.
    aliases: [image_id]
    type: list
    elements: str
  filters:
    description:
      - A dict of filters to apply. Each dict item consists of a filter key and a filter value.
      - See U(https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DescribeImages.html) for possible filters.
      - Filter names and values are case sensitive.
    type: dict
  owners:
    description:
      - Filter the images by the owner. Valid options are an AWS account ID, self,
        or an AWS owner alias ( amazon | aws-marketplace | microsoft ).
    aliases: [owner]
    type: list
    elements: str
  executable_users:
    description:
      - Filter images by users with explicit launch permissions. Valid options are an AWS account ID, self, or all (public AMIs).
    aliases: [executable_user]
    type: list
    elements: str
  describe_image_attributes:
    description:
      - Describe attributes (like launchPermission) of the images found.
    default: no
    type: bool

extends_documentation_fragment:
- amazon.aws.aws
- amazon.aws.ec2

'''

EXAMPLES = '''
# Note: These examples do not set authentication details, see the AWS Guide for details.

- name: gather information about an AMI using ami-id
  amazon.aws.ec2_ami_info:
    image_ids: ami-5b488823

- name: gather information about all AMIs with tag key Name and value webapp
  amazon.aws.ec2_ami_info:
    filters:
      "tag:Name": webapp

- name: gather information about an AMI with 'AMI Name' equal to foobar
  amazon.aws.ec2_ami_info:
    filters:
      name: foobar

- name: gather information about Ubuntu 17.04 AMIs published by Canonical (099720109477)
  amazon.aws.ec2_ami_info:
    owners: 099720109477
    filters:
      name: "ubuntu/images/ubuntu-zesty-17.04-*"
'''

RETURN = '''
images:
  description: A list of images.
  returned: always
  type: list
  elements: dict
  contains:
    architecture:
      description: The architecture of the image.
      returned: always
      type: str
      sample: x86_64
    block_device_mappings:
      description: Any block device mapping entries.
      returned: always
      type: list
      elements: dict
      contains:
        device_name:
          description: The device name exposed to the instance.
          returned: always
          type: str
          sample: /dev/sda1
        ebs:
          description: EBS volumes
          returned: always
          type: complex
    creation_date:
      description: The date and time the image was created.
      returned: always
      type: str
      sample: '2017-10-16T19:22:13.000Z'
    description:
      description: The description of the AMI.
      returned: always
      type: str
      sample: ''
    ena_support:
      description: Whether enhanced networking with ENA is enabled.
      returned: always
      type: bool
      sample: true
    hypervisor:
      description: The hypervisor type of the image.
      returned: always
      type: str
      sample: xen
    image_id:
      description: The ID of the AMI.
      returned: always
      type: str
      sample: ami-5b466623
    image_location:
      description: The location of the AMI.
      returned: always
      type: str
      sample: 408466080000/Webapp
    image_type:
      description: The type of image.
      returned: always
      type: str
      sample: machine
    launch_permissions:
      description: A List of AWS accounts may launch the AMI.
      returned: When image is owned by calling account and I(describe_image_attributes) is yes.
      type: list
      elements: dict
      contains:
        group:
            description: A value of 'all' means the AMI is public.
            type: str
        user_id:
            description: An AWS account ID with permissions to launch the AMI.
            type: str
      sample: [{"group": "all"}, {"user_id": "408466080000"}]
    name:
      description: The name of the AMI that was provided during image creation.
      returned: always
      type: str
      sample: Webapp
    owner_id:
      description: The AWS account ID of the image owner.
      returned: always
      type: str
      sample: '408466080000'
    public:
      description: Whether the image has public launch permissions.
      returned: always
      type: bool
      sample: true
    root_device_name:
      description: The device name of the root device.
      returned: always
      type: str
      sample: /dev/sda1
    root_device_type:
      description: The type of root device used by the AMI.
      returned: always
      type: str
      sample: ebs
    sriov_net_support:
      description: Whether enhanced networking is enabled.
      returned: always
      type: str
      sample: simple
    state:
      description: The current state of the AMI.
      returned: always
      type: str
      sample: available
    tags:
      description: Any tags assigned to the image.
      returned: always
      type: dict
    virtualization_type:
      description: The type of virtualization of the AMI.
      returned: always
      type: str
      sample: hvm
'''

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

from ansible.module_utils.common.dict_transformations import camel_dict_to_snake_dict

from ..module_utils.core import AnsibleAWSModule
from ..module_utils.core import is_boto3_error_code
from ..module_utils.ec2 import AWSRetry
from ..module_utils.ec2 import ansible_dict_to_boto3_filter_list
from ..module_utils.ec2 import boto3_tag_list_to_ansible_dict


def list_ec2_images(ec2_client, module):

    image_ids = module.params.get("image_ids")
    owners = module.params.get("owners")
    executable_users = module.params.get("executable_users")
    filters = module.params.get("filters")
    owner_param = []

    # describe_images is *very* slow if you pass the `Owners`
    # param (unless it's self), for some reason.
    # Converting the owners to filters and removing from the
    # owners param greatly speeds things up.
    # Implementation based on aioue's suggestion in #24886
    for owner in owners:
        if owner.isdigit():
            if 'owner-id' not in filters:
                filters['owner-id'] = list()
            filters['owner-id'].append(owner)
        elif owner == 'self':
            # self not a valid owner-alias filter (https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DescribeImages.html)
            owner_param.append(owner)
        else:
            if 'owner-alias' not in filters:
                filters['owner-alias'] = list()
            filters['owner-alias'].append(owner)

    filters = ansible_dict_to_boto3_filter_list(filters)

    try:
        images = ec2_client.describe_images(aws_retry=True, ImageIds=image_ids, Filters=filters, Owners=owner_param,
                                            ExecutableUsers=executable_users)
        images = [camel_dict_to_snake_dict(image) for image in images["Images"]]
    except (ClientError, BotoCoreError) as err:
        module.fail_json_aws(err, msg="error describing images")
    for image in images:
        try:
            image['tags'] = boto3_tag_list_to_ansible_dict(image.get('tags', []))
            if module.params.get("describe_image_attributes"):
                launch_permissions = ec2_client.describe_image_attribute(aws_retry=True, Attribute='launchPermission',
                                                                         ImageId=image['image_id'])['LaunchPermissions']
                image['launch_permissions'] = [camel_dict_to_snake_dict(perm) for perm in launch_permissions]
        except is_boto3_error_code('AuthFailure'):
            # describing launch permissions of images owned by others is not permitted, but shouldn't cause failures
            pass
        except (ClientError, BotoCoreError) as err:  # pylint: disable=duplicate-except
            module.fail_json_aws(err, 'Failed to describe AMI')

    images.sort(key=lambda e: e.get('creation_date', ''))  # it may be possible that creation_date does not always exist
    module.exit_json(images=images)


def main():

    argument_spec = dict(
        image_ids=dict(default=[], type='list', elements='str', aliases=['image_id']),
        filters=dict(default={}, type='dict'),
        owners=dict(default=[], type='list', elements='str', aliases=['owner']),
        executable_users=dict(default=[], type='list', elements='str', aliases=['executable_user']),
        describe_image_attributes=dict(default=False, type='bool')
    )

    module = AnsibleAWSModule(argument_spec=argument_spec, supports_check_mode=True)

    ec2_client = module.client('ec2', retry_decorator=AWSRetry.jittered_backoff())

    list_ec2_images(ec2_client, module)


if __name__ == '__main__':
    main()
