# -*- coding: utf-8 -*-
'''
Module for handling openstack glance calls.

:optdepends:    - glanceclient Python adapter
:configuration: This module is not usable until the following are specified
    either in a pillar or in the minion's config file::

        keystone.user: admin
        keystone.password: verybadpass
        keystone.tenant: admin
        keystone.insecure: False   #(optional)
        keystone.auth_url: 'http://127.0.0.1:5000/v2.0/'

    If configuration for multiple openstack accounts is required, they can be
    set up as different configuration profiles:
    For example::

        openstack1:
          keystone.user: admin
          keystone.password: verybadpass
          keystone.tenant: admin
          keystone.auth_url: 'http://127.0.0.1:5000/v2.0/'

        openstack2:
          keystone.user: admin
          keystone.password: verybadpass
          keystone.tenant: admin
          keystone.auth_url: 'http://127.0.0.2:5000/v2.0/'

    With this configuration in place, any of the glance functions can
    make use of a configuration profile by declaring it explicitly.
    For example::

        salt '*' glance.image_list profile=openstack1
'''

# Import Python libs
from __future__ import absolute_import, print_function, unicode_literals
import re

# Import salt libs
from salt.exceptions import (
    SaltInvocationError
    )
from salt.ext import six

# pylint: disable=import-error
HAS_GLANCE = False
try:
    from glanceclient import client
    from glanceclient import exc
    HAS_GLANCE = True
except ImportError:
    pass

# Workaround, as the Glance API v2 requires you to
# already have a keystone session token
HAS_KEYSTONE = False
try:
    from keystoneclient.v2_0 import client as kstone
    #import keystoneclient.apiclient.exceptions as kstone_exc
    HAS_KEYSTONE = True
except ImportError:
    pass

import logging
logging.basicConfig(level=logging.DEBUG)
log = logging.getLogger(__name__)
import pprint


def __virtual__():
    '''
    Only load this module if glance
    is installed on this minion.
    '''
    if HAS_GLANCE:
        return 'glance'
    return (False, 'The glance execution module cannot be loaded: the glanceclient python library is not available.')


__opts__ = {}


def _auth(profile=None, api_version=2, **connection_args):
    '''
    Set up glance credentials, returns
    `glanceclient.client.Client`. Optional parameter
    "api_version" defaults to 2.

    Only intended to be used within glance-enabled modules
    '''
    __utils__['versions.warn_until'](
        'Aluminium',
        (
            'The glance module has been deprecated and will be removed in {version}.  '
            'Please update to using the glanceng module'
        ),
    )

    if profile:
        prefix = profile + ":keystone."
    else:
        prefix = "keystone."

    def get(key, default=None):
        '''
        Checks connection_args, then salt-minion config,
        falls back to specified default value.
        '''
        return connection_args.get('connection_' + key,
            __salt__['config.get'](prefix + key, default))

    user = get('user', 'admin')
    password = get('password', None)
    tenant = get('tenant', 'admin')
    tenant_id = get('tenant_id')
    auth_url = get('auth_url', 'http://127.0.0.1:35357/v2.0')
    insecure = get('insecure', False)
    admin_token = get('token')
    region = get('region')
    ks_endpoint = get('endpoint', 'http://127.0.0.1:9292/')
    g_endpoint_url = __salt__['keystone.endpoint_get']('glance', profile)
    # The trailing 'v2' causes URLs like thise one:
    # http://127.0.0.1:9292/v2/v1/images
    g_endpoint_url = re.sub('/v2', '', g_endpoint_url['internalurl'])

    if admin_token and api_version != 1 and not password:
        # If we had a password we could just
        # ignore the admin-token and move on...
        raise SaltInvocationError('Only can use keystone admin token ' +
            'with Glance API v1')
    elif password:
        # Can't use the admin-token anyway
        kwargs = {'username': user,
                  'password': password,
                  'tenant_id': tenant_id,
                  'auth_url': auth_url,
                  'endpoint_url': g_endpoint_url,
                  'region_name': region,
                  'tenant_name': tenant}
        # 'insecure' keyword not supported by all v2.0 keystone clients
        #   this ensures it's only passed in when defined
        if insecure:
            kwargs['insecure'] = True
    elif api_version == 1 and admin_token:
        kwargs = {'token': admin_token,
                  'auth_url': auth_url,
                  'endpoint_url': g_endpoint_url}
    else:
        raise SaltInvocationError('No credentials to authenticate with.')

    if HAS_KEYSTONE:
        log.debug(
            'Calling keystoneclient.v2_0.client.Client(%s, **%s)',
            ks_endpoint, kwargs
        )
        keystone = kstone.Client(**kwargs)
        kwargs['token'] = keystone.get_token(keystone.session)
        # This doesn't realy prevent the password to show up
        # in the minion log as keystoneclient.session is
        # logging it anyway when in debug-mode
        kwargs.pop('password')
        log.debug(
            'Calling glanceclient.client.Client(%s, %s, **%s)',
            api_version,
            g_endpoint_url,
            kwargs
        )
        # may raise exc.HTTPUnauthorized, exc.HTTPNotFound
        # but we deal with those elsewhere
        return client.Client(api_version, g_endpoint_url, **kwargs)
    else:
        raise NotImplementedError(
            "Can't retrieve a auth_token without keystone")


def _add_image(collection, image):
    '''
    Add image to given dictionary
    '''
    image_prep = {
            'id': image.id,
            'name': image.name,
            'created_at': image.created_at,
            'file': image.file,
            'min_disk': image.min_disk,
            'min_ram': image.min_ram,
            'owner': image.owner,
            'protected': image.protected,
            'status': image.status,
            'tags': image.tags,
            'updated_at': image.updated_at,
            'visibility': image.visibility,
        }
    # Those cause AttributeErrors in Icehouse' glanceclient
    for attr in ['container_format', 'disk_format', 'size']:
        if attr in image:
            image_prep[attr] = image[attr]
    if type(collection) is dict:
        collection[image.name] = image_prep
    elif type(collection) is list:
        collection.append(image_prep)
    else:
        msg = '"collection" is {0}'.format(type(collection)) +\
            'instead of dict or list.'
        log.error(msg)
        raise TypeError(msg)
    return collection


def image_create(name,
                 location=None,
                 profile=None,
                 visibility=None,
                 container_format='bare',
                 disk_format='raw',
                 protected=None,):
    '''
    Create an image (glance image-create)

    CLI Example, old format:

    .. code-block:: bash

        salt '*' glance.image_create name=f16-jeos \\
                 disk_format=qcow2 container_format=ovf

    CLI Example, new format resembling Glance API v2:

    .. code-block:: bash

        salt '*' glance.image_create name=f16-jeos visibility=public \\
                 disk_format=qcow2 container_format=ovf

    The parameter 'visibility' defaults to 'public' if not specified.
    '''
    kwargs = {}
    # valid options for "visibility":
    v_list = ['public', 'private']
    # valid options for "container_format":
    cf_list = ['ami', 'ari', 'aki', 'bare', 'ovf']
    # valid options for "disk_format":
    df_list = ['ami', 'ari', 'aki', 'vhd', 'vmdk',
               'raw', 'qcow2', 'vdi', 'iso']

    kwargs['copy_from'] = location
    if visibility is not None:
        if visibility not in v_list:
            raise SaltInvocationError('"visibility" needs to be one ' +
                'of the following: {0}'.format(', '.join(v_list)))
        elif visibility == 'public':
            kwargs['is_public'] = True
        else:
            kwargs['is_public'] = False
    else:
        kwargs['is_public'] = True
    if container_format not in cf_list:
        raise SaltInvocationError('"container_format" needs to be ' +
            'one of the following: {0}'.format(', '.join(cf_list)))
    else:
        kwargs['container_format'] = container_format
    if disk_format not in df_list:
        raise SaltInvocationError('"disk_format" needs to be one ' +
            'of the following: {0}'.format(', '.join(df_list)))
    else:
        kwargs['disk_format'] = disk_format
    if protected is not None:
        kwargs['protected'] = protected
    # Icehouse's glanceclient doesn't have add_location() and
    # glanceclient.v2 doesn't implement Client.images.create()
    # in a usable fashion. Thus we have to use v1 for now.
    g_client = _auth(profile, api_version=1)
    image = g_client.images.create(name=name, **kwargs)
    return image_show(image.id, profile=profile)


def image_delete(id=None, name=None, profile=None):  # pylint: disable=C0103
    '''
    Delete an image (glance image-delete)

    CLI Examples:

    .. code-block:: bash

        salt '*' glance.image_delete c2eb2eb0-53e1-4a80-b990-8ec887eae7df
        salt '*' glance.image_delete id=c2eb2eb0-53e1-4a80-b990-8ec887eae7df
        salt '*' glance.image_delete name=f16-jeos
    '''
    g_client = _auth(profile)
    image = {'id': False, 'name': None}
    if name:
        for image in g_client.images.list():
            if image.name == name:
                id = image.id  # pylint: disable=C0103
                continue
    if not id:
        return {
            'result': False,
            'comment':
                'Unable to resolve image id '
                'for name {0}'.format(name)
            }
    elif not name:
        name = image['name']
    try:
        g_client.images.delete(id)
    except exc.HTTPNotFound:
        return {
            'result': False,
            'comment': 'No image with ID {0}'.format(id)
            }
    except exc.HTTPForbidden as forbidden:
        log.error(six.text_type(forbidden))
        return {
            'result': False,
            'comment': six.text_type(forbidden)
            }
    return {
        'result': True,
        'comment': 'Deleted image \'{0}\' ({1}).'.format(name, id),
        }


def image_show(id=None, name=None, profile=None):  # pylint: disable=C0103
    '''
    Return details about a specific image (glance image-show)

    CLI Example:

    .. code-block:: bash

        salt '*' glance.image_show
    '''
    g_client = _auth(profile)
    ret = {}
    if name:
        for image in g_client.images.list():
            if image.name == name:
                id = image.id  # pylint: disable=C0103
                continue
    if not id:
        return {
            'result': False,
            'comment':
                'Unable to resolve image ID '
                'for name \'{0}\''.format(name)
            }
    try:
        image = g_client.images.get(id)
    except exc.HTTPNotFound:
        return {
            'result': False,
            'comment': 'No image with ID {0}'.format(id)
            }
    pformat = pprint.PrettyPrinter(indent=4).pformat
    log.debug('Properties of image {0}:\n{1}'.format(
        image.name, pformat(image)))

    schema = image_schema(profile=profile)
    if len(schema.keys()) == 1:
        schema = schema['image']
    for key in schema:
        if key in image:
            ret[key] = image[key]
    return ret


def image_list(id=None, profile=None, name=None):  # pylint: disable=C0103
    '''
    Return a list of available images (glance image-list)

    CLI Example:

    .. code-block:: bash

        salt '*' glance.image_list
    '''
    g_client = _auth(profile)
    ret = []
    for image in g_client.images.list():
        if id is None and name is None:
            _add_image(ret, image)
        else:
            if id is not None and id == image.id:
                _add_image(ret, image)
                return ret
            if name == image.name:
                if name in ret and __salt__['salt_version.less_than']('Boron'):
                    # Not really worth an exception
                    return {
                        'result': False,
                        'comment':
                            'More than one image with '
                            'name "{0}"'.format(name)
                        }
                _add_image(ret, image)
    log.debug('Returning images: {0}'.format(ret))
    return ret


def image_schema(profile=None):
    '''
    Returns names and descriptions of the schema "image"'s
    properties for this profile's instance of glance

    CLI Example:

    .. code-block:: bash

        salt '*' glance.image_schema
    '''
    return schema_get('image', profile)


def image_update(id=None, name=None, profile=None, **kwargs):  # pylint: disable=C0103
    '''
    Update properties of given image.
    Known to work for:
    - min_ram (in MB)
    - protected (bool)
    - visibility ('public' or 'private')

    CLI Example:

    .. code-block:: bash

        salt '*' glance.image_update id=c2eb2eb0-53e1-4a80-b990-8ec887eae7df
        salt '*' glance.image_update name=f16-jeos
    '''
    if id:
        image = image_show(id=id, profile=profile)
        if 'result' in image and not image['result']:
            return image
        elif len(image) == 1:
            image = image.values()[0]
    elif name:
        img_list = image_list(name=name, profile=profile)
        if img_list is dict and 'result' in img_list:
            return img_list
        elif len(img_list) == 0:
            return {
                'result': False,
                'comment':
                    'No image with name \'{0}\' '
                    'found.'.format(name)
                }
        elif len(img_list) == 1:
            try:
                image = img_list[0]
            except KeyError:
                image = img_list[name]
    else:
        raise SaltInvocationError
    log.debug('Found image:\n{0}'.format(image))
    to_update = {}
    for key, value in kwargs.items():
        if key.startswith('_'):
            continue
        if key not in image or image[key] != value:
            log.debug('add <{0}={1}> to to_update'.format(key, value))
            to_update[key] = value
    g_client = _auth(profile)
    updated = g_client.images.update(image['id'], **to_update)
    return updated


def schema_get(name, profile=None):
    '''
    Known valid names of schemas are:
      - image
      - images
      - member
      - members

    CLI Example:

    .. code-block:: bash

        salt '*' glance.schema_get name=f16-jeos
    '''
    g_client = _auth(profile)
    pformat = pprint.PrettyPrinter(indent=4).pformat
    schema_props = {}
    for prop in g_client.schemas.get(name).properties:
        schema_props[prop.name] = prop.description
    log.debug('Properties of schema {0}:\n{1}'.format(
        name, pformat(schema_props)))
    return {name: schema_props}


def _item_list(profile=None):
    '''
    Template for writing list functions
    Return a list of available items (glance items-list)

    CLI Example:

    .. code-block:: bash

        salt '*' glance.item_list
    '''
    g_client = _auth(profile)
    ret = []
    for item in g_client.items.list():
        ret.append(item.__dict__)
        #ret[item.name] = {
        #        'name': item.name,
        #    }
    return ret


# The following is a list of functions that need to be incorporated in the
# glance module. This list should be updated as functions are added.

# image-download      Download a specific image.
# member-create       Share a specific image with a tenant.
# member-delete       Remove a shared image from a tenant.
# member-list         Describe sharing permissions by image or tenant.
