#!/usr/bin/python
# Copyright 2015 Google Inc. All Rights Reserved.
# 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


"""An Ansible module to utilize GCE image resources."""

ANSIBLE_METADATA = {'metadata_version': '1.1',
                    'status': ['preview'],
                    'supported_by': 'community'}


DOCUMENTATION = '''
---
module: gce_img
version_added: "1.9"
short_description: utilize GCE image resources
description:
    - This module can create and delete GCE private images from gzipped
      compressed tarball containing raw disk data or from existing detached
      disks in any zone. U(https://cloud.google.com/compute/docs/images)
options:
  name:
    description:
      - the name of the image to create or delete
    required: true
    default: null
  description:
    description:
      - an optional description
    required: false
    default: null
  family:
    description:
      - an optional family name
    required: false
    default: null
    version_added: "2.2"
  source:
    description:
      - the source disk or the Google Cloud Storage URI to create the image from
    required: false
    default: null
  state:
    description:
      - desired state of the image
    required: false
    default: "present"
    choices: ["present", "absent"]
  zone:
    description:
      - the zone of the disk specified by source
    required: false
    default: "us-central1-a"
  timeout:
    description:
      - timeout for the operation
    required: false
    default: 180
    version_added: "2.0"
  service_account_email:
    description:
      - service account email
    required: false
    default: null
  pem_file:
    description:
      - path to the pem file associated with the service account email
    required: false
    default: null
  project_id:
    description:
      - your GCE project ID
    required: false
    default: null
requirements:
    - "python >= 2.6"
    - "apache-libcloud"
author: "Tom Melendez (supertom)"
'''

EXAMPLES = '''
# Create an image named test-image from the disk 'test-disk' in zone us-central1-a.
- gce_img:
    name: test-image
    source: test-disk
    zone: us-central1-a
    state: present

# Create an image named test-image from a tarball in Google Cloud Storage.
- gce_img:
    name: test-image
    source: https://storage.googleapis.com/bucket/path/to/image.tgz

# Alternatively use the gs scheme
- gce_img:
    name: test-image
    source: gs://bucket/path/to/image.tgz

# Delete an image named test-image.
- gce_img:
    name: test-image
    state: absent
'''


try:
    import libcloud
    from libcloud.compute.types import Provider
    from libcloud.compute.providers import get_driver
    from libcloud.common.google import GoogleBaseError
    from libcloud.common.google import ResourceExistsError
    from libcloud.common.google import ResourceNotFoundError
    _ = Provider.GCE
    has_libcloud = True
except ImportError:
    has_libcloud = False

from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.gce import gce_connect


GCS_URI = 'https://storage.googleapis.com/'


def create_image(gce, name, module):
    """Create an image with the specified name."""
    source = module.params.get('source')
    zone = module.params.get('zone')
    desc = module.params.get('description')
    timeout = module.params.get('timeout')
    family = module.params.get('family')

    if not source:
        module.fail_json(msg='Must supply a source', changed=False)

    if source.startswith(GCS_URI):
        # source is a Google Cloud Storage URI
        volume = source
    elif source.startswith('gs://'):
        # libcloud only accepts https URI.
        volume = source.replace('gs://', GCS_URI)
    else:
        try:
            volume = gce.ex_get_volume(source, zone)
        except ResourceNotFoundError:
            module.fail_json(msg='Disk %s not found in zone %s' % (source, zone),
                             changed=False)
        except GoogleBaseError as e:
            module.fail_json(msg=str(e), changed=False)

    gce_extra_args = {}
    if family is not None:
        gce_extra_args['family'] = family

    old_timeout = gce.connection.timeout
    try:
        gce.connection.timeout = timeout
        gce.ex_create_image(name, volume, desc, use_existing=False, **gce_extra_args)
        return True
    except ResourceExistsError:
        return False
    except GoogleBaseError as e:
        module.fail_json(msg=str(e), changed=False)
    finally:
        gce.connection.timeout = old_timeout


def delete_image(gce, name, module):
    """Delete a specific image resource by name."""
    try:
        gce.ex_delete_image(name)
        return True
    except ResourceNotFoundError:
        return False
    except GoogleBaseError as e:
        module.fail_json(msg=str(e), changed=False)


def main():
    module = AnsibleModule(
        argument_spec=dict(
            name=dict(required=True),
            family=dict(),
            description=dict(),
            source=dict(),
            state=dict(default='present', choices=['present', 'absent']),
            zone=dict(default='us-central1-a'),
            service_account_email=dict(),
            pem_file=dict(type='path'),
            project_id=dict(),
            timeout=dict(type='int', default=180)
        )
    )

    if not has_libcloud:
        module.fail_json(msg='libcloud with GCE support is required.')

    gce = gce_connect(module)

    name = module.params.get('name')
    state = module.params.get('state')
    family = module.params.get('family')
    changed = False

    if family is not None and hasattr(libcloud, '__version__') and libcloud.__version__ <= '0.20.1':
        module.fail_json(msg="Apache Libcloud 1.0.0+ is required to use 'family' option",
                         changed=False)

    # user wants to create an image.
    if state == 'present':
        changed = create_image(gce, name, module)

    # user wants to delete the image.
    if state == 'absent':
        changed = delete_image(gce, name, module)

    module.exit_json(changed=changed, name=name)


if __name__ == '__main__':
    main()
