# Copyright 2012 OpenStack LLC.
# All Rights Reserved.
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

import argparse
import copy
import os
import sys

if os.name == 'nt':
    import msvcrt
else:
    msvcrt = None

from glanceclient import exc
from glanceclient.common import utils
from glanceclient.openstack.common import strutils
import glanceclient.v1.images

#NOTE(bcwaldon): import deprecated cli functions
from glanceclient.v1.legacy_shell import *

CONTAINER_FORMATS = 'Acceptable formats: ami, ari, aki, bare, and ovf.'
DISK_FORMATS = ('Acceptable formats: ami, ari, aki, vhd, vmdk, raw, '
                'qcow2, vdi, and iso.')


@utils.arg('--name', metavar='<NAME>',
           help='Filter images to those that have this name.')
@utils.arg('--status', metavar='<STATUS>',
           help='Filter images to those that have this status.')
@utils.arg('--container-format', metavar='<CONTAINER_FORMAT>',
           help='Filter images to those that have this container format. '
                + CONTAINER_FORMATS)
@utils.arg('--disk-format', metavar='<DISK_FORMAT>',
           help='Filter images to those that have this disk format. '
                + DISK_FORMATS)
@utils.arg('--size-min', metavar='<SIZE>',
           help='Filter images to those with a size greater than this.')
@utils.arg('--size-max', metavar='<SIZE>',
           help='Filter images to those with a size less than this.')
@utils.arg('--property-filter', metavar='<KEY=VALUE>',
           help="Filter images by a user-defined image property.",
           action='append', dest='properties', default=[])
@utils.arg('--page-size', metavar='<SIZE>', default=None, type=int,
           help='Number of images to request in each paginated request.')
@utils.arg('--human-readable', action='store_true', default=False,
           help='Print image size in a human-friendly format.')
@utils.arg('--sort-key', default='name',
           choices=glanceclient.v1.images.SORT_KEY_VALUES,
           help='Sort image list by specified field.')
@utils.arg('--sort-dir', default='asc',
           choices=glanceclient.v1.images.SORT_DIR_VALUES,
           help='Sort image list in specified direction.')
@utils.arg('--is-public', type=utils.string_to_bool, metavar='{True|False}',
           help=('Allows the user to select a listing of public or non '
                 'public images.'))
def do_image_list(gc, args):
    """List images you can access."""
    filter_keys = ['name', 'status', 'container_format', 'disk_format',
                   'size_min', 'size_max', 'is_public']
    filter_items = [(key, getattr(args, key)) for key in filter_keys]
    filters = dict([item for item in filter_items if item[1] is not None])

    if args.properties:
        property_filter_items = [p.split('=', 1) for p in args.properties]
        filters['properties'] = dict(property_filter_items)

    kwargs = {'filters': filters}
    if args.page_size is not None:
        kwargs['page_size'] = args.page_size

    kwargs['sort_key'] = args.sort_key
    kwargs['sort_dir'] = args.sort_dir

    images = gc.images.list(**kwargs)

    if args.human_readable:
        def convert_size(image):
            image.size = utils.make_size_human_readable(image.size)
            return image

        images = (convert_size(image) for image in images)

    columns = ['ID', 'Name', 'Disk Format', 'Container Format',
               'Size', 'Status']
    utils.print_list(images, columns)


def _image_show(image, human_readable=False):
    # Flatten image properties dict for display
    info = copy.deepcopy(image._info)
    if human_readable:
        info['size'] = utils.make_size_human_readable(info['size'])
    for (k, v) in info.pop('properties').iteritems():
        info['Property \'%s\'' % k] = v

    utils.print_dict(info)


def _set_data_field(fields, args):
    if 'location' not in fields and 'copy_from' not in fields:
        if args.file:
            fields['data'] = open(args.file, 'rb')
        else:
            # distinguish cases where:
            # (1) stdin is not valid (as in cron jobs):
            #     glance ... <&-
            # (2) image data is provided through standard input:
            #     glance ... < /tmp/file or cat /tmp/file | glance ...
            # (3) no image data provided:
            #     glance ...
            try:
                stat_result = os.fstat(0)
            except OSError:
                # (1) stdin is not valid (closed...)
                fields['data'] = None
                return
            if not sys.stdin.isatty() and stat_result.st_size != 0:
                # (2) image data is provided through standard input
                if msvcrt:
                    msvcrt.setmode(sys.stdin.fileno(), os.O_BINARY)
                fields['data'] = sys.stdin
            else:
                # (3) no image data provided
                fields['data'] = None


@utils.arg('image', metavar='<IMAGE>', help='Name or ID of image to describe.')
@utils.arg('--human-readable', action='store_true', default=False,
           help='Print image size in a human-friendly format.')
def do_image_show(gc, args):
    """Describe a specific image."""
    image_id = utils.find_resource(gc.images, args.image).id
    image = gc.images.get(image_id)
    _image_show(image, args.human_readable)


@utils.arg('--file', metavar='<FILE>',
           help='Local file to save downloaded image data to. '
                'If this is not specified the image data will be '
                'written to stdout.')
@utils.arg('image', metavar='<IMAGE>', help='Name or ID of image to download.')
def do_image_download(gc, args):
    """Download a specific image."""
    image = utils.find_resource(gc.images, args.image)
    body = image.data()
    utils.save_image(body, args.file)


@utils.arg('--id', metavar='<IMAGE_ID>',
           help='ID of image to reserve.')
@utils.arg('--name', metavar='<NAME>',
           help='Name of image.')
@utils.arg('--store', metavar='<STORE>',
           help='Store to upload image to.')
@utils.arg('--disk-format', metavar='<DISK_FORMAT>',
           help='Disk format of image. ' + DISK_FORMATS)
@utils.arg('--container-format', metavar='<CONTAINER_FORMAT>',
           help='Container format of image. ' + CONTAINER_FORMATS)
@utils.arg('--owner', metavar='<TENANT_ID>',
           help='Tenant who should own image.')
@utils.arg('--size', metavar='<SIZE>',
           help=('Size of image data (in bytes). Only used with'
                 ' \'--location\' and \'--copy_from\'.'))
@utils.arg('--min-disk', metavar='<DISK_GB>',
           help='Minimum size of disk needed to boot image (in gigabytes).')
@utils.arg('--min-ram', metavar='<DISK_RAM>',
           help='Minimum amount of ram needed to boot image (in megabytes).')
@utils.arg('--location', metavar='<IMAGE_URL>',
           help=('URL where the data for this image already resides. For '
                 'example, if the image data is stored in swift, you could '
                 'specify \'swift://account:key@example.com/container/obj\'.'))
@utils.arg('--file', metavar='<FILE>',
           help=('Local file that contains disk image to be uploaded during'
                 ' creation. Alternatively, images can be passed to the client'
                 ' via stdin.'))
@utils.arg('--checksum', metavar='<CHECKSUM>',
           help=('Hash of image data used Glance can use for verification.'
                 ' Provide a md5 checksum here.'))
@utils.arg('--copy-from', metavar='<IMAGE_URL>',
           help=('Similar to \'--location\' in usage, but this indicates that'
                 ' the Glance server should immediately copy the data and'
                 ' store it in its configured image store.'))
#NOTE(bcwaldon): This will be removed once devstack is updated
# to use --is-public
@utils.arg('--public', action='store_true', default=False,
           help=argparse.SUPPRESS)
@utils.arg('--is-public', type=utils.string_to_bool, metavar='[True|False]',
           help='Make image accessible to the public.')
@utils.arg('--is-protected', type=utils.string_to_bool, metavar='[True|False]',
           help='Prevent image from being deleted.')
@utils.arg('--property', metavar="<key=value>", action='append', default=[],
           help=("Arbitrary property to associate with image. "
                 "May be used multiple times."))
@utils.arg('--human-readable', action='store_true', default=False,
           help='Print image size in a human-friendly format.')
def do_image_create(gc, args):
    """Create a new image."""
    # Filter out None values
    fields = dict(filter(lambda x: x[1] is not None, vars(args).items()))

    fields['is_public'] = fields.get('is_public') or fields.pop('public')

    if 'is_protected' in fields:
        fields['protected'] = fields.pop('is_protected')

    raw_properties = fields.pop('property')
    fields['properties'] = {}
    for datum in raw_properties:
        key, value = datum.split('=', 1)
        fields['properties'][key] = value

    # Filter out values we can't use
    CREATE_PARAMS = glanceclient.v1.images.CREATE_PARAMS
    fields = dict(filter(lambda x: x[0] in CREATE_PARAMS, fields.items()))

    _set_data_field(fields, args)

    image = gc.images.create(**fields)
    _image_show(image, args.human_readable)


@utils.arg('image', metavar='<IMAGE>', help='Name or ID of image to modify.')
@utils.arg('--name', metavar='<NAME>',
           help='Name of image.')
@utils.arg('--disk-format', metavar='<DISK_FORMAT>',
           help='Disk format of image. ' + DISK_FORMATS)
@utils.arg('--container-format', metavar='<CONTAINER_FORMAT>',
           help='Container format of image. ' + CONTAINER_FORMATS)
@utils.arg('--owner', metavar='<TENANT_ID>',
           help='Tenant who should own image.')
@utils.arg('--size', metavar='<SIZE>',
           help='Size of image data (in bytes).')
@utils.arg('--min-disk', metavar='<DISK_GB>',
           help='Minimum size of disk needed to boot image (in gigabytes).')
@utils.arg('--min-ram', metavar='<DISK_RAM>',
           help='Minimum amount of ram needed to boot image (in megabytes).')
@utils.arg('--location', metavar='<IMAGE_URL>',
           help=('URL where the data for this image already resides. For '
                 'example, if the image data is stored in swift, you could '
                 'specify \'swift://account:key@example.com/container/obj\'.'))
@utils.arg('--file', metavar='<FILE>',
           help=('Local file that contains disk image to be uploaded during'
                 ' update. Alternatively, images can be passed to the client'
                 ' via stdin.'))
@utils.arg('--checksum', metavar='<CHECKSUM>',
           help='Hash of image data used Glance can use for verification.')
@utils.arg('--copy-from', metavar='<IMAGE_URL>',
           help=('Similar to \'--location\' in usage, but this indicates that'
                 ' the Glance server should immediately copy the data and'
                 ' store it in its configured image store.'))
@utils.arg('--is-public', type=utils.string_to_bool, metavar='[True|False]',
           help='Make image accessible to the public.')
@utils.arg('--is-protected', type=utils.string_to_bool, metavar='[True|False]',
           help='Prevent image from being deleted.')
@utils.arg('--property', metavar="<key=value>", action='append', default=[],
           help=("Arbitrary property to associate with image. "
                 "May be used multiple times."))
@utils.arg('--purge-props', action='store_true', default=False,
           help=("If this flag is present, delete all image properties "
                 "not explicitly set in the update request. Otherwise, "
                 "those properties not referenced are preserved."))
@utils.arg('--human-readable', action='store_true', default=False,
           help='Print image size in a human-friendly format.')
def do_image_update(gc, args):
    """Update a specific image."""
    # Filter out None values
    fields = dict(filter(lambda x: x[1] is not None, vars(args).items()))

    image_arg = fields.pop('image')
    image = utils.find_resource(gc.images, image_arg)

    if 'is_protected' in fields:
        fields['protected'] = fields.pop('is_protected')

    raw_properties = fields.pop('property')
    fields['properties'] = {}
    for datum in raw_properties:
        key, value = datum.split('=', 1)
        fields['properties'][key] = value

    # Filter out values we can't use
    UPDATE_PARAMS = glanceclient.v1.images.UPDATE_PARAMS
    fields = dict(filter(lambda x: x[0] in UPDATE_PARAMS, fields.items()))

    _set_data_field(fields, args)

    image = gc.images.update(image, purge_props=args.purge_props, **fields)
    _image_show(image, args.human_readable)


@utils.arg('images', metavar='<IMAGE>', nargs='+',
           help='Name or ID of image(s) to delete.')
def do_image_delete(gc, args):
    """Delete specified image(s)."""
    for args_image in args.images:
        image = utils.find_resource(gc.images, args_image)
        try:
            if args.verbose:
                print 'Requesting image delete for %s ...' % \
                      strutils.safe_encode(args_image),

            gc.images.delete(image)

            if args.verbose:
                print '[Done]'

        except exc.HTTPException as e:
            if args.verbose:
                print '[Fail]'
            print '%s: Unable to delete image %s' % (e, args_image)


@utils.arg('--image-id', metavar='<IMAGE_ID>',
           help='Filter results by an image ID.')
@utils.arg('--tenant-id', metavar='<TENANT_ID>',
           help='Filter results by a tenant ID.')
def do_member_list(gc, args):
    """Describe sharing permissions by image or tenant."""
    if args.image_id and args.tenant_id:
        print 'Unable to filter members by both --image-id and --tenant-id.'
        sys.exit(1)
    elif args.image_id:
        kwargs = {'image': args.image_id}
    elif args.tenant_id:
        kwargs = {'member': args.tenant_id}
    else:
        print 'Unable to list all members. Specify --image-id or --tenant-id'
        sys.exit(1)

    members = gc.image_members.list(**kwargs)
    columns = ['Image ID', 'Member ID', 'Can Share']
    utils.print_list(members, columns)


@utils.arg('image', metavar='<IMAGE>',
           help='Image to add member to.')
@utils.arg('tenant_id', metavar='<TENANT_ID>',
           help='Tenant to add as member')
@utils.arg('--can-share', action='store_true', default=False,
           help='Allow the specified tenant to share this image.')
def do_member_create(gc, args):
    """Share a specific image with a tenant."""
    image = utils.find_resource(gc.images, args.image)
    gc.image_members.create(image, args.tenant_id, args.can_share)


@utils.arg('image', metavar='<IMAGE>',
           help='Image from which to remove member')
@utils.arg('tenant_id', metavar='<TENANT_ID>',
           help='Tenant to remove as member')
def do_member_delete(gc, args):
    """Remove a shared image from a tenant."""
    image_id = utils.find_resource(gc.images, args.image).id
    if not args.dry_run:
        gc.image_members.delete(image_id, args.tenant_id)
    else:
        print "Dry run. We would have done the following:"
        print ('Remove "%s" from the member list of image '
               '"%s"' % (args.tenant_id, args.image))