#   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.
#

"""Orchestration v1 Stack action implementations"""

import logging
import sys

from osc_lib.command import command
from osc_lib import exceptions as exc
from osc_lib import utils
from oslo_serialization import jsonutils
import six
from six.moves.urllib import request
import yaml

from heatclient._i18n import _
from heatclient.common import event_utils
from heatclient.common import format_utils
from heatclient.common import hook_utils
from heatclient.common import http
from heatclient.common import template_utils
from heatclient.common import utils as heat_utils
from heatclient import exc as heat_exc


class CreateStack(command.ShowOne):
    """Create a stack."""

    log = logging.getLogger(__name__ + '.CreateStack')

    def get_parser(self, prog_name):
        parser = super(CreateStack, self).get_parser(prog_name)
        parser.add_argument(
            '-e', '--environment',
            metavar='<environment>',
            action='append',
            help=_('Path to the environment. Can be specified multiple times')
        )
        parser.add_argument(
            '--timeout',
            metavar='<timeout>',
            type=int,
            help=_('Stack creating timeout in minutes')
        )
        parser.add_argument(
            '--pre-create',
            metavar='<resource>',
            default=None,
            action='append',
            help=_('Name of a resource to set a pre-create hook to. Resources '
                   'in nested stacks can be set using slash as a separator: '
                   '``nested_stack/another/my_resource``. You can use '
                   'wildcards to match multiple stacks or resources: '
                   '``nested_stack/an*/*_resource``. This can be specified '
                   'multiple times')
        )
        parser.add_argument(
            '--enable-rollback',
            action='store_true',
            help=_('Enable rollback on create/update failure')
        )
        parser.add_argument(
            '--parameter',
            metavar='<key=value>',
            action='append',
            help=_('Parameter values used to create the stack. This can be '
                   'specified multiple times')
        )
        parser.add_argument(
            '--parameter-file',
            metavar='<key=file>',
            action='append',
            help=_('Parameter values from file used to create the stack. '
                   'This can be specified multiple times. Parameter values '
                   'would be the content of the file')
        )
        parser.add_argument(
            '--wait',
            action='store_true',
            help=_('Wait until stack goes to CREATE_COMPLETE or CREATE_FAILED')
        )
        parser.add_argument(
            '--tags',
            metavar='<tag1,tag2...>',
            help=_('A list of tags to associate with the stack')
        )
        parser.add_argument(
            '--dry-run',
            action='store_true',
            help=_('Do not actually perform the stack create, but show what '
                   'would be created')
        )
        parser.add_argument(
            'name',
            metavar='<stack-name>',
            help=_('Name of the stack to create')
        )
        parser.add_argument(
            '-t', '--template',
            metavar='<template>',
            required=True,
            help=_('Path to the template')
        )

        return parser

    def take_action(self, parsed_args):
        self.log.debug('take_action(%s)', parsed_args)

        client = self.app.client_manager.orchestration

        tpl_files, template = template_utils.process_template_path(
            parsed_args.template,
            object_request=http.authenticated_fetcher(client))

        env_files_list = []
        env_files, env = (
            template_utils.process_multiple_environments_and_files(
                env_paths=parsed_args.environment,
                env_list_tracker=env_files_list))

        parameters = heat_utils.format_all_parameters(
            parsed_args.parameter,
            parsed_args.parameter_file,
            parsed_args.template)

        if parsed_args.pre_create:
            template_utils.hooks_to_env(env, parsed_args.pre_create,
                                        'pre-create')

        fields = {
            'stack_name': parsed_args.name,
            'disable_rollback': not parsed_args.enable_rollback,
            'parameters': parameters,
            'template': template,
            'files': dict(list(tpl_files.items()) + list(env_files.items())),
            'environment': env
        }

        # If one or more environments is found, pass the listing to the server
        if env_files_list:
            fields['environment_files'] = env_files_list

        if parsed_args.tags:
            fields['tags'] = parsed_args.tags
        if parsed_args.timeout:
            fields['timeout_mins'] = parsed_args.timeout

        if parsed_args.dry_run:
            stack = client.stacks.preview(**fields)

            formatters = {
                'description': heat_utils.text_wrap_formatter,
                'template_description': heat_utils.text_wrap_formatter,
                'stack_status_reason': heat_utils.text_wrap_formatter,
                'parameters': heat_utils.json_formatter,
                'outputs': heat_utils.json_formatter,
                'resources': heat_utils.json_formatter,
                'links': heat_utils.link_formatter,
            }

            columns = []
            for key in stack.to_dict():
                columns.append(key)
            columns.sort()

            return (
                columns,
                utils.get_item_properties(stack, columns,
                                          formatters=formatters)
            )

        stack = client.stacks.create(**fields)['stack']
        if parsed_args.wait:
            stack_status, msg = event_utils.poll_for_events(
                client, parsed_args.name, action='CREATE')
            if stack_status == 'CREATE_FAILED':
                raise exc.CommandError(msg)

        return _show_stack(client, stack['id'], format='table', short=True)


class UpdateStack(command.ShowOne):
    """Update a stack."""

    log = logging.getLogger(__name__ + '.UpdateStack')

    def get_parser(self, prog_name):
        parser = super(UpdateStack, self).get_parser(prog_name)
        parser.add_argument(
            '-t', '--template', metavar='<template>',
            help=_('Path to the template')
        )
        parser.add_argument(
            '-e', '--environment', metavar='<environment>',
            action='append',
            help=_('Path to the environment. Can be specified multiple times')
        )
        parser.add_argument(
            '--pre-update', metavar='<resource>', action='append',
            help=_('Name of a resource to set a pre-update hook to. Resources '
                   'in nested stacks can be set using slash as a separator: '
                   '``nested_stack/another/my_resource``. You can use '
                   'wildcards to match multiple stacks or resources: '
                   '``nested_stack/an*/*_resource``. This can be specified '
                   'multiple times')
        )
        parser.add_argument(
            '--timeout', metavar='<timeout>', type=int,
            help=_('Stack update timeout in minutes')
        )
        parser.add_argument(
            '--rollback', metavar='<value>',
            help=_('Set rollback on update failure. '
                   'Value "enabled" sets rollback to enabled. '
                   'Value "disabled" sets rollback to disabled. '
                   'Value "keep" uses the value of existing stack to be '
                   'updated (default)')
        )
        parser.add_argument(
            '--dry-run', action="store_true",
            help=_('Do not actually perform the stack update, but show what '
                   'would be changed')
        )
        parser.add_argument(
            '--show-nested', default=False, action="store_true",
            help=_('Show nested stacks when performing --dry-run')
        )
        parser.add_argument(
            '--parameter', metavar='<key=value>',
            help=_('Parameter values used to create the stack. '
                   'This can be specified multiple times'),
            action='append'
        )
        parser.add_argument(
            '--parameter-file', metavar='<key=file>',
            help=_('Parameter values from file used to create the stack. '
                   'This can be specified multiple times. Parameter value '
                   'would be the content of the file'),
            action='append'
        )
        parser.add_argument(
            '--existing', action="store_true",
            help=_('Re-use the template, parameters and environment of the '
                   'current stack. If the template argument is omitted then '
                   'the existing template is used. If no %(env_arg)s is '
                   'specified then the existing environment is used. '
                   'Parameters specified in %(arg)s will patch over the '
                   'existing values in the current stack. Parameters omitted '
                   'will keep the existing values') % {
                       'arg': '--parameter', 'env_arg': '--environment'}
        )
        parser.add_argument(
            '--clear-parameter', metavar='<parameter>',
            help=_('Remove the parameters from the set of parameters of '
                   'current stack for the %(cmd)s. The default value in the '
                   'template will be used. This can be specified multiple '
                   'times') % {'cmd': 'stack-update'},
            action='append'
        )
        parser.add_argument(
            'stack', metavar='<stack>',
            help=_('Name or ID of stack to update')
        )
        parser.add_argument(
            '--tags', metavar='<tag1,tag2...>',
            help=_('An updated list of tags to associate with the stack')
        )
        parser.add_argument(
            '--wait',
            action='store_true',
            help=_('Wait until stack goes to UPDATE_COMPLETE or '
                   'UPDATE_FAILED')
        )
        parser.add_argument(
            '--converge',
            action='store_true',
            help=_('Stack update with observe on reality.')
        )

        return parser

    def take_action(self, parsed_args):
        self.log.debug('take_action(%s)', parsed_args)

        client = self.app.client_manager.orchestration

        tpl_files, template = template_utils.process_template_path(
            parsed_args.template,
            object_request=http.authenticated_fetcher(client),
            existing=parsed_args.existing)

        env_files_list = []
        env_files, env = (
            template_utils.process_multiple_environments_and_files(
                env_paths=parsed_args.environment,
                env_list_tracker=env_files_list))

        parameters = heat_utils.format_all_parameters(
            parsed_args.parameter,
            parsed_args.parameter_file,
            parsed_args.template)

        if parsed_args.pre_update:
            template_utils.hooks_to_env(env, parsed_args.pre_update,
                                        'pre-update')

        fields = {
            'stack_id': parsed_args.stack,
            'parameters': parameters,
            'existing': parsed_args.existing,
            'template': template,
            'files': dict(list(tpl_files.items()) + list(env_files.items())),
            'environment': env
        }

        # If one or more environments is found, pass the listing to the server
        if env_files_list:
            fields['environment_files'] = env_files_list

        if parsed_args.tags:
            fields['tags'] = parsed_args.tags
        if parsed_args.timeout:
            fields['timeout_mins'] = parsed_args.timeout
        if parsed_args.clear_parameter:
            fields['clear_parameters'] = list(parsed_args.clear_parameter)

        if parsed_args.rollback:
            rollback = parsed_args.rollback.strip().lower()
            if rollback not in ('enabled', 'disabled', 'keep'):
                msg = _('--rollback invalid value: %s') % parsed_args.rollback
                raise exc.CommandError(msg)
            if rollback != 'keep':
                fields['disable_rollback'] = rollback == 'disabled'

        if parsed_args.dry_run:
            if parsed_args.show_nested:
                fields['show_nested'] = parsed_args.show_nested

            changes = client.stacks.preview_update(**fields)

            fields = ['state', 'resource_name', 'resource_type',
                      'resource_identity']

            columns = sorted(changes.get("resource_changes", {}).keys())
            data = [heat_utils.json_formatter(changes["resource_changes"][key])
                    for key in columns]

            return columns, data

        if parsed_args.wait:
            # find the last event to use as the marker
            events = event_utils.get_events(client,
                                            stack_id=parsed_args.stack,
                                            event_args={'sort_dir': 'desc'},
                                            limit=1)
            marker = events[0].id if events else None

        if parsed_args.converge:
            fields['converge'] = True

        client.stacks.update(**fields)

        if parsed_args.wait:
            stack = client.stacks.get(parsed_args.stack)
            stack_status, msg = event_utils.poll_for_events(
                client, stack.stack_name, action='UPDATE', marker=marker)
            if stack_status == 'UPDATE_FAILED':
                raise exc.CommandError(msg)

        return _show_stack(client, parsed_args.stack, format='table',
                           short=True)


class ShowStack(command.ShowOne):
    """Show stack details."""

    log = logging.getLogger(__name__ + ".ShowStack")

    def get_parser(self, prog_name):
        parser = super(ShowStack, self).get_parser(prog_name)
        parser.add_argument(
            'stack',
            metavar='<stack>',
            help='Stack to display (name or ID)',
        )
        parser.add_argument(
            '--no-resolve-outputs', action="store_true",
            help=_('Do not resolve outputs of the stack.')
        )
        return parser

    def take_action(self, parsed_args):
        self.log.debug("take_action(%s)", parsed_args)

        heat_client = self.app.client_manager.orchestration
        return _show_stack(
            heat_client, stack_id=parsed_args.stack,
            format=parsed_args.formatter,
            resolve_outputs=(not parsed_args.no_resolve_outputs))


def _show_stack(heat_client, stack_id, format='', short=False,
                resolve_outputs=True):
    try:
        _resolve_outputs = not short and resolve_outputs
        data = heat_client.stacks.get(stack_id=stack_id,
                                      resolve_outputs=_resolve_outputs)
    except heat_exc.HTTPNotFound:
        raise exc.CommandError('Stack not found: %s' % stack_id)
    else:

        columns = [
            'id',
            'stack_name',
            'description',
            'creation_time',
            'updated_time',
            'stack_status',
            'stack_status_reason',
        ]

        if not short:
            columns.append('parameters')
            if _resolve_outputs:
                columns.append('outputs')
            columns.append('links')

            exclude_columns = ('template_description',)
            for key in data.to_dict():
                # add remaining columns without an explicit order
                if key not in columns and key not in exclude_columns:
                    columns.append(key)

        formatters = {}
        complex_formatter = None
        if format in 'table':
            complex_formatter = heat_utils.yaml_formatter
        elif format in ('shell', 'value', 'html'):
            complex_formatter = heat_utils.json_formatter
        if complex_formatter:
            formatters['parameters'] = complex_formatter
            formatters['outputs'] = complex_formatter
            formatters['links'] = complex_formatter
            formatters['tags'] = complex_formatter

        return columns, utils.get_item_properties(data, columns,
                                                  formatters=formatters)


class ListStack(command.Lister):
    """List stacks."""

    log = logging.getLogger(__name__ + '.ListStack')

    def get_parser(self, prog_name):
        parser = super(ListStack, self).get_parser(prog_name)
        parser.add_argument(
            '--deleted',
            action='store_true',
            help=_('Include soft-deleted stacks in the stack listing')
        )
        parser.add_argument(
            '--nested',
            action='store_true',
            help=_('Include nested stacks in the stack listing')
        )
        parser.add_argument(
            '--hidden',
            action='store_true',
            help=_('Include hidden stacks in the stack listing')
        )
        parser.add_argument(
            '--property',
            dest='properties',
            metavar='<key=value>',
            help=_('Filter properties to apply on returned stacks (repeat to '
                   'filter on multiple properties)'),
            action='append'
        )
        parser.add_argument(
            '--tags',
            metavar='<tag1,tag2...>',
            help=_('List of tags to filter by. Can be combined with '
                   '--tag-mode to specify how to filter tags')
        )
        parser.add_argument(
            '--tag-mode',
            metavar='<mode>',
            help=_('Method of filtering tags. Must be one of "any", "not", '
                   'or "not-any". If not specified, multiple tags will be '
                   'combined with the boolean AND expression')
        )
        parser.add_argument(
            '--limit',
            metavar='<limit>',
            help=_('The number of stacks returned')
        )
        parser.add_argument(
            '--marker',
            metavar='<id>',
            help=_('Only return stacks that appear after the given ID')
        )
        parser.add_argument(
            '--sort',
            metavar='<key>[:<direction>]',
            help=_('Sort output by selected keys and directions (asc or desc) '
                   '(default: asc). Specify multiple times to sort on '
                   'multiple properties')
        )
        parser.add_argument(
            '--all-projects',
            action='store_true',
            help=_('Include all projects (admin only)')
        )
        parser.add_argument(
            '--short',
            action='store_true',
            help=_('List fewer fields in output')
        )
        parser.add_argument(
            '--long',
            action='store_true',
            help=_('List additional fields in output, this is implied by '
                   '--all-projects')
        )
        return parser

    def take_action(self, parsed_args):
        self.log.debug("take_action(%s)", parsed_args)

        client = self.app.client_manager.orchestration
        return _list(client, args=parsed_args)


class EnvironmentShowStack(format_utils.YamlFormat):
    """Show a stack's environment."""

    log = logging.getLogger(__name__)

    def get_parser(self, prog_name):
        parser = super(EnvironmentShowStack, self).get_parser(prog_name)
        parser.add_argument(
            'stack',
            metavar='<NAME or ID>',
            help=_('Name or ID of stack to query')
        )
        return parser

    def take_action(self, parsed_args):
        self.log.debug('take_action(%s)', parsed_args)

        client = self.app.client_manager.orchestration

        try:
            env = client.stacks.environment(stack_id=parsed_args.stack)
        except heat_exc.HTTPNotFound:
            msg = _('Stack not found: %s') % parsed_args.stack
            raise exc.CommandError(msg)

        fields = ['parameters', 'resource_registry', 'parameter_defaults']

        columns = [f for f in fields if f in env]
        data = [env[c] for c in columns]

        return columns, data


class ListFileStack(format_utils.YamlFormat):
    """Show a stack's files map."""

    log = logging.getLogger(__name__)

    def get_parser(self, prog_name):
        parser = super(ListFileStack, self).get_parser(prog_name)
        parser.add_argument(
            'stack',
            metavar='<NAME or ID>',
            help=_('Name or ID of stack to query')
        )
        return parser

    def take_action(self, parsed_args):
        self.log.debug('take_action(%s)', parsed_args)

        client = self.app.client_manager.orchestration

        try:
            files = client.stacks.files(stack_id=parsed_args.stack)
        except heat_exc.HTTPNotFound:
            msg = _('Stack not found: %s') % parsed_args.stack
            raise exc.CommandError(msg)

        return ['files'], [files]


def _list(client, args=None):
    kwargs = {}
    columns = [
        'ID',
        'Stack Name',
        'Stack Status',
        'Creation Time',
        'Updated Time',
    ]

    if args:
        kwargs = {'limit': args.limit,
                  'marker': args.marker,
                  'filters': heat_utils.format_parameters(args.properties),
                  'tags': None,
                  'tags_any': None,
                  'not_tags': None,
                  'not_tags_any': None,
                  'global_tenant': args.all_projects or args.long,
                  'show_deleted': args.deleted,
                  'show_hidden': args.hidden}

        if args.tags:
            if args.tag_mode:
                if args.tag_mode == 'any':
                    kwargs['tags_any'] = args.tags
                elif args.tag_mode == 'not':
                    kwargs['not_tags'] = args.tags
                elif args.tag_mode == 'not-any':
                    kwargs['not_tags_any'] = args.tags
                else:
                    err = _('tag mode must be one of "any", "not", "not-any"')
                    raise exc.CommandError(err)
            else:
                kwargs['tags'] = args.tags

        if args.short:
            columns.pop()
            columns.pop()
        if args.long:
            columns.insert(2, 'Stack Owner')

        if args.nested:
            columns.append('Parent')
            kwargs['show_nested'] = True

        if args.deleted:
            columns.append('Deletion Time')

    data = client.stacks.list(**kwargs)
    data = list(data)
    for stk in data:
        if hasattr(stk, 'project'):
            columns.insert(2, 'Project')
            break
    data = utils.sort_items(data, args.sort if args else None)

    return (
        columns,
        (utils.get_item_properties(s, columns) for s in data)
    )


class DeleteStack(command.Command):
    """Delete stack(s)."""

    log = logging.getLogger(__name__ + ".DeleteStack")

    def get_parser(self, prog_name):
        parser = super(DeleteStack, self).get_parser(prog_name)
        parser.add_argument(
            'stack',
            metavar='<stack>',
            nargs='+',
            help=_('Stack(s) to delete (name or ID)')
        )
        parser.add_argument(
            '-y', '--yes',
            action='store_true',
            help=_('Skip yes/no prompt (assume yes)')
        )
        parser.add_argument(
            '--wait',
            action='store_true',
            help=_('Wait for stack delete to complete')
        )
        return parser

    def take_action(self, parsed_args):
        self.log.debug("take_action(%s)", parsed_args)

        heat_client = self.app.client_manager.orchestration

        try:
            if not parsed_args.yes and sys.stdin.isatty():
                prompt_response = six.moves.input(
                    _("Are you sure you want to delete this stack(s) [y/N]? ")
                ).lower()
                if not prompt_response.startswith('y'):
                    self.log.info('User did not confirm stack delete so '
                                  'taking no action.')
                    return
        except KeyboardInterrupt:  # ctrl-c
            self.log.info('User did not confirm stack delete '
                          '(ctrl-c) so taking no action.')
            return
        except EOFError:  # ctrl-d
            self.log.info('User did not confirm stack delete '
                          '(ctrl-d) so taking no action.')
            return

        failure_count = 0
        stacks_waiting = []
        for sid in parsed_args.stack:
            marker = None
            if parsed_args.wait:
                try:
                    # find the last event to use as the marker
                    events = event_utils.get_events(heat_client,
                                                    stack_id=sid,
                                                    event_args={
                                                        'sort_dir': 'desc'},
                                                    limit=1)
                    if events:
                        marker = events[0].id
                except heat_exc.CommandError as ex:
                    failure_count += 1
                    print(ex)
                    continue

            try:
                heat_client.stacks.delete(sid)
                stacks_waiting.append((sid, marker))
            except heat_exc.HTTPNotFound:
                failure_count += 1
                print(_('Stack not found: %s') % sid)
            except heat_exc.Forbidden:
                failure_count += 1
                print(_('Forbidden: %s') % sid)

        if parsed_args.wait:
            for sid, marker in stacks_waiting:
                try:
                    stack_status, msg = event_utils.poll_for_events(
                        heat_client, sid, action='DELETE', marker=marker)
                except heat_exc.CommandError:
                    continue
                if stack_status == 'DELETE_FAILED':
                    failure_count += 1
                    print(msg)

        if failure_count:
            msg = (_('Unable to delete %(count)d of the %(total)d stacks.') %
                   {'count': failure_count, 'total': len(parsed_args.stack)})
            raise exc.CommandError(msg)


class AdoptStack(command.ShowOne):
    """Adopt a stack."""

    log = logging.getLogger(__name__ + '.AdoptStack')

    def get_parser(self, prog_name):
        parser = super(AdoptStack, self).get_parser(prog_name)
        parser.add_argument(
            'name',
            metavar='<stack-name>',
            help=_('Name of the stack to adopt')
        )
        parser.add_argument(
            '-e', '--environment',
            metavar='<environment>',
            action='append',
            help=_('Path to the environment. Can be specified multiple times')
        )
        parser.add_argument(
            '--timeout',
            metavar='<timeout>',
            type=int,
            help=_('Stack creation timeout in minutes')
        )
        parser.add_argument(
            '--enable-rollback',
            action='store_true',
            help=_('Enable rollback on create/update failure')
        )
        parser.add_argument(
            '--parameter',
            metavar='<key=value>',
            action='append',
            help=_('Parameter values used to create the stack. Can be '
                   'specified multiple times')
        )
        parser.add_argument(
            '--wait',
            action='store_true',
            help=_('Wait until stack adopt completes')
        )
        parser.add_argument(
            '--adopt-file',
            metavar='<adopt-file>',
            required=True,
            help=_('Path to adopt stack data file')
        )
        return parser

    def take_action(self, parsed_args):
        self.log.debug('take_action(%s)', parsed_args)

        client = self.app.client_manager.orchestration

        env_files, env = (
            template_utils.process_multiple_environments_and_files(
                env_paths=parsed_args.environment))

        adopt_url = heat_utils.normalise_file_path_to_url(
            parsed_args.adopt_file)
        adopt_data = request.urlopen(adopt_url).read().decode('utf-8')
        yaml_adopt_data = yaml.safe_load(adopt_data) or {}
        files = yaml_adopt_data.get('files', {})
        files.update(env_files)
        fields = {
            'stack_name': parsed_args.name,
            'disable_rollback': not parsed_args.enable_rollback,
            'adopt_stack_data': adopt_data,
            'parameters': heat_utils.format_parameters(parsed_args.parameter),
            'files': files,
            'environment': env,
            'timeout': parsed_args.timeout
        }

        stack = client.stacks.create(**fields)['stack']

        if parsed_args.wait:
            stack_status, msg = event_utils.poll_for_events(
                client, parsed_args.name, action='ADOPT')
            if stack_status == 'ADOPT_FAILED':
                raise exc.CommandError(msg)

        return _show_stack(client, stack['id'], format='table', short=True)


class AbandonStack(format_utils.JsonFormat):
    """Abandon stack and output results."""

    log = logging.getLogger(__name__ + '.AbandonStack')

    def get_parser(self, prog_name):
        parser = super(AbandonStack, self).get_parser(prog_name)
        parser.add_argument(
            'stack',
            metavar='<stack>',
            help=_('Name or ID of stack to abandon')
        )
        parser.add_argument(
            '--output-file',
            metavar='<output-file>',
            help=_('File to output abandon results')
        )

        return parser

    def take_action(self, parsed_args):
        self.log.debug('take_action(%s)', parsed_args)

        client = self.app.client_manager.orchestration

        try:
            stack = client.stacks.abandon(stack_id=parsed_args.stack)
        except heat_exc.HTTPNotFound:
            msg = _('Stack not found: %s') % parsed_args.stack
            raise exc.CommandError(msg)

        if parsed_args.output_file is not None:
            try:
                with open(parsed_args.output_file, 'w') as f:
                    f.write(jsonutils.dumps(stack, indent=2))
                    return [], None
            except IOError as e:
                raise exc.CommandError(str(e))

        data = list(six.itervalues(stack))
        columns = list(six.iterkeys(stack))
        return columns, data


class ExportStack(format_utils.JsonFormat):
    """Export stack data json."""

    log = logging.getLogger(__name__ + '.ExportStack')

    def get_parser(self, prog_name):
        parser = super(ExportStack, self).get_parser(prog_name)
        parser.add_argument(
            'stack',
            metavar='<stack>',
            help=_('Name or ID of stack to export')
        )
        parser.add_argument(
            '--output-file',
            metavar='<output-file>',
            help=_('File to output export data')
        )

        return parser

    def take_action(self, parsed_args):
        self.log.debug('take_action(%s)', parsed_args)

        client = self.app.client_manager.orchestration

        try:
            data_info = client.stacks.export(stack_id=parsed_args.stack)
        except heat_exc.HTTPNotFound:
            msg = _('Stack not found: %s') % parsed_args.stack
            raise exc.CommandError(msg)

        if parsed_args.output_file is not None:
            try:
                with open(parsed_args.output_file, 'w') as f:
                    f.write(jsonutils.dumps(data_info, indent=2))
                    return [], None
            except IOError as e:
                raise exc.CommandError(str(e))

        data = list(six.itervalues(data_info))
        columns = list(six.iterkeys(data_info))
        return columns, data


class OutputShowStack(command.ShowOne):
    """Show stack output."""

    log = logging.getLogger(__name__ + '.OutputShowStack')

    def get_parser(self, prog_name):
        parser = super(OutputShowStack, self).get_parser(prog_name)
        parser.add_argument(
            'stack',
            metavar='<stack>',
            help=_('Name or ID of stack to query')
        )
        parser.add_argument(
            'output',
            metavar='<output>',
            nargs='?',
            default=None,
            help=_('Name of an output to display')
        )
        parser.add_argument(
            '--all',
            action='store_true',
            help=_('Display all stack outputs')
        )
        return parser

    def take_action(self, parsed_args):
        self.log.debug('take_action(%s)', parsed_args)

        client = self.app.client_manager.orchestration

        if not parsed_args.all and parsed_args.output is None:
            msg = _('Either <OUTPUT NAME> or --all must be specified.')
            raise exc.CommandError(msg)

        if parsed_args.all and parsed_args.output is not None:
            msg = _('Cannot specify both <OUTPUT NAME> and --all.')
            raise exc.CommandError(msg)

        if parsed_args.all:
            try:
                stack = client.stacks.get(parsed_args.stack)
            except heat_exc.HTTPNotFound:
                msg = _('Stack not found: %s') % parsed_args.stack
                raise exc.CommandError(msg)

            outputs = stack.to_dict().get('outputs', [])
            columns = []
            values = []
            for output in outputs:
                columns.append(output['output_key'])
                values.append(heat_utils.json_formatter(output))

            return columns, values

        try:
            output = client.stacks.output_show(parsed_args.stack,
                                               parsed_args.output)['output']
        except heat_exc.HTTPNotFound:
            msg = _('Stack %(id)s or output %(out)s not found.') % {
                'id': parsed_args.stack, 'out': parsed_args.output}
            try:
                output = None
                stack = client.stacks.get(parsed_args.stack).to_dict()
                for o in stack.get('outputs', []):
                    if o['output_key'] == parsed_args.output:
                        output = o
                        break
                if output is None:
                    raise exc.CommandError(msg)
            except heat_exc.HTTPNotFound:
                raise exc.CommandError(msg)

        if 'output_error' in output:
            msg = _('Output error: %s') % output['output_error']
            raise exc.CommandError(msg)

        return self.dict2columns(output)


class OutputListStack(command.Lister):
    """List stack outputs."""

    log = logging.getLogger(__name__ + '.OutputListStack')

    def get_parser(self, prog_name):
        parser = super(OutputListStack, self).get_parser(prog_name)
        parser.add_argument(
            'stack',
            metavar='<stack>',
            help=_('Name or ID of stack to query')
        )
        return parser

    def take_action(self, parsed_args):
        self.log.debug('take_action(%s)', parsed_args)

        client = self.app.client_manager.orchestration

        try:
            outputs = client.stacks.output_list(parsed_args.stack)['outputs']
        except heat_exc.HTTPNotFound:
            try:
                outputs = client.stacks.get(
                    parsed_args.stack).to_dict()['outputs']
            except heat_exc.HTTPNotFound:
                msg = _('Stack not found: %s') % parsed_args.stack
                raise exc.CommandError(msg)

        columns = ['output_key', 'description']

        return (
            columns,
            (utils.get_dict_properties(s, columns) for s in outputs)
        )


class TemplateShowStack(format_utils.YamlFormat):
    """Display stack template."""

    log = logging.getLogger(__name__ + '.TemplateShowStack')

    def get_parser(self, prog_name):
        parser = super(TemplateShowStack, self).get_parser(prog_name)
        parser.add_argument(
            'stack',
            metavar='<stack>',
            help=_('Name or ID of stack to query')
        )
        return parser

    def take_action(self, parsed_args):
        self.log.debug('take_action(%s)', parsed_args)

        client = self.app.client_manager.orchestration

        try:
            template = client.stacks.template(stack_id=parsed_args.stack)
        except heat_exc.HTTPNotFound:
            msg = _('Stack not found: %s') % parsed_args.stack
            raise exc.CommandError(msg)

        return self.dict2columns(template)


class StackActionBase(command.Lister):
    """Stack actions base."""

    log = logging.getLogger(__name__ + '.StackActionBase')

    def _get_parser(self, prog_name, stack_help, wait_help):
        parser = super(StackActionBase, self).get_parser(prog_name)
        parser.add_argument(
            'stack',
            metavar='<stack>',
            nargs="+",
            help=stack_help
        )
        parser.add_argument(
            '--wait',
            action='store_true',
            help=wait_help
        )
        return parser

    def _take_action(self, parsed_args, action, action_name=None):
        self.log.debug("take_action(%s)", parsed_args)
        heat_client = self.app.client_manager.orchestration
        return _stacks_action(
            parsed_args,
            heat_client,
            action,
            action_name
        )


def _stacks_action(parsed_args, heat_client, action, action_name=None):
    rows = []
    columns = [
        'ID',
        'Stack Name',
        'Stack Status',
        'Creation Time',
        'Updated Time'
    ]
    for stack in parsed_args.stack:
        data = _stack_action(stack, parsed_args, heat_client, action,
                             action_name)
        rows += [utils.get_dict_properties(data.to_dict(), columns)]
    return (columns, rows)


def _stack_action(stack, parsed_args, heat_client, action, action_name=None):
    if parsed_args.wait:
        # find the last event to use as the marker
        events = event_utils.get_events(heat_client,
                                        stack_id=stack,
                                        event_args={'sort_dir': 'desc'},
                                        limit=1)
        marker = events[0].id if events else None

    try:
        action(stack)
    except heat_exc.HTTPNotFound:
        msg = _('Stack not found: %s') % stack
        raise exc.CommandError(msg)

    if parsed_args.wait:
        s = heat_client.stacks.get(stack)
        stack_status, msg = event_utils.poll_for_events(
            heat_client, s.stack_name, action=action_name, marker=marker)
        if action_name:
            if stack_status == '%s_FAILED' % action_name:
                raise exc.CommandError(msg)
        else:
            if stack_status.endswith('_FAILED'):
                raise exc.CommandError(msg)

    return heat_client.stacks.get(stack)


class SuspendStack(StackActionBase):
    """Suspend a stack."""

    log = logging.getLogger(__name__ + '.SuspendStack')

    def get_parser(self, prog_name):
        return self._get_parser(
            prog_name,
            _('Stack(s) to suspend (name or ID)'),
            _('Wait for suspend to complete')
        )

    def take_action(self, parsed_args):
        return self._take_action(
            parsed_args,
            self.app.client_manager.orchestration.actions.suspend,
            'SUSPEND'
        )


class ResumeStack(StackActionBase):
    """Resume a stack."""

    log = logging.getLogger(__name__ + '.ResumeStack')

    def get_parser(self, prog_name):
        return self._get_parser(
            prog_name,
            _('Stack(s) to resume (name or ID)'),
            _('Wait for resume to complete')
        )

    def take_action(self, parsed_args):
        return self._take_action(
            parsed_args,
            self.app.client_manager.orchestration.actions.resume,
            'RESUME'
        )


class CheckStack(StackActionBase):
    """Check a stack."""

    log = logging.getLogger(__name__ + '.CheckStack')

    def get_parser(self, prog_name):
        return self._get_parser(
            prog_name,
            _('Stack(s) to check update (name or ID)'),
            _('Wait for check to complete')
        )

    def take_action(self, parsed_args):
        return self._take_action(
            parsed_args,
            self.app.client_manager.orchestration.actions.check,
            'CHECK'
        )


class CancelStack(StackActionBase):
    """Cancel current task for a stack.

    Supported tasks for cancellation:

    * update
    * create
    """

    log = logging.getLogger(__name__ + '.CancelStack')

    def get_parser(self, prog_name):
        parser = self._get_parser(
            prog_name,
            _('Stack(s) to cancel (name or ID)'),
            _('Wait for cancel to complete')
        )
        parser.add_argument(
            '--no-rollback',
            action='store_true',
            help=_('Cancel without rollback')
        )
        return parser

    def take_action(self, parsed_args):
        self.log.debug("take_action(%s)", parsed_args)
        rows = []
        columns = [
            'ID',
            'Stack Name',
            'Stack Status',
            'Creation Time',
            'Updated Time'
        ]
        heat_client = self.app.client_manager.orchestration
        if parsed_args.no_rollback:
            action = heat_client.actions.cancel_without_rollback
            allowed_statuses = ['create_in_progress',
                                'update_in_progress']
        else:
            action = heat_client.actions.cancel_update
            allowed_statuses = ['update_in_progress']
        for stack in parsed_args.stack:
            try:
                data = heat_client.stacks.get(stack_id=stack)
            except heat_exc.HTTPNotFound:
                raise exc.CommandError('Stack not found: %s' % stack)
            status = getattr(data, 'stack_status').lower()
            if status in allowed_statuses:
                data = _stack_action(
                    stack,
                    parsed_args,
                    heat_client,
                    action
                )
                rows += [utils.get_dict_properties(data.to_dict(), columns)]
            else:
                err = _("Stack %(id)s with status \'%(status)s\' "
                        "not in cancelable state") % {
                    'id': stack, 'status': status}
                raise exc.CommandError(err)

        return (columns, rows)


class StackHookPoll(command.Lister):
    '''List resources with pending hook for a stack.'''

    log = logging.getLogger(__name__ + '.StackHookPoll')

    def get_parser(self, prog_name):
        parser = super(StackHookPoll, self).get_parser(prog_name)
        parser.add_argument(
            'stack',
            metavar='<stack>',
            help=_('Stack to display (name or ID)')
        )
        parser.add_argument(
            '--nested-depth',
            metavar='<nested-depth>',
            help=_('Depth of nested stacks from which to display hooks')
        )
        return parser

    def take_action(self, parsed_args):
        self.log.debug("take_action(%s)", parsed_args)
        heat_client = self.app.client_manager.orchestration
        return _hook_poll(
            parsed_args,
            heat_client
        )


def _hook_poll(args, heat_client):
    """List resources with pending hook for a stack."""

    # There are a few steps to determining if a stack has pending hooks
    # 1. The stack is IN_PROGRESS status (otherwise, by definition no hooks
    #    can be pending
    # 2. There is an event for a resource associated with hitting a hook
    # 3. There is not an event associated with clearing the hook in step(2)
    #
    # So, essentially, this ends up being a specially filtered type of event
    # listing, because all hook status is exposed via events.  In future
    # we might consider exposing some more efficient interface via the API
    # to reduce the expense of this brute-force polling approach
    columns = ['ID', 'Resource Status Reason', 'Resource Status', 'Event Time']

    if args.nested_depth:
        try:
            nested_depth = int(args.nested_depth)
        except ValueError:
            msg = _("--nested-depth invalid value %s") % args.nested_depth
            raise exc.CommandError(msg)
        columns.append('Stack Name')
    else:
        nested_depth = 0

    hook_type = hook_utils.get_hook_type_via_status(heat_client, args.stack)
    event_args = {'sort_dir': 'asc'}
    hook_events = event_utils.get_hook_events(
        heat_client, stack_id=args.stack, event_args=event_args,
        nested_depth=nested_depth, hook_type=hook_type)

    if len(hook_events) >= 1:
        if hasattr(hook_events[0], 'resource_name'):
            columns.insert(0, 'Resource Name')
        else:
            columns.insert(0, 'Logical Resource ID')

    rows = (utils.get_item_properties(h, columns) for h in hook_events)
    return (columns, rows)


class StackHookClear(command.Command):
    """Clear resource hooks on a given stack."""

    log = logging.getLogger(__name__ + '.StackHookClear')

    def get_parser(self, prog_name):
        parser = super(StackHookClear, self).get_parser(prog_name)
        parser.add_argument(
            'stack',
            metavar='<stack>',
            help=_('Stack to display (name or ID)')
        )
        parser.add_argument(
            '--pre-create',
            action='store_true',
            help=_('Clear the pre-create hooks')
        )
        parser.add_argument(
            '--pre-update',
            action='store_true',
            help=_('Clear the pre-update hooks')
        )
        parser.add_argument(
            '--pre-delete',
            action='store_true',
            help=_('Clear the pre-delete hooks')
        )
        parser.add_argument(
            'hook',
            metavar='<resource>',
            nargs='+',
            help=_('Resource names with hooks to clear. Resources '
                   'in nested stacks can be set using slash as a separator: '
                   '``nested_stack/another/my_resource``. You can use '
                   'wildcards to match multiple stacks or resources: '
                   '``nested_stack/an*/*_resource``')
        )
        return parser

    def take_action(self, parsed_args):
        self.log.debug("take_action(%s)", parsed_args)
        heat_client = self.app.client_manager.orchestration
        return _hook_clear(
            parsed_args,
            heat_client
        )


def _hook_clear(args, heat_client):
    """Clear resource hooks on a given stack."""
    if args.pre_create:
        hook_type = 'pre-create'
    elif args.pre_update:
        hook_type = 'pre-update'
    elif args.pre_delete:
        hook_type = 'pre-delete'
    else:
        hook_type = hook_utils.get_hook_type_via_status(heat_client,
                                                        args.stack)

    for hook_string in args.hook:
        hook = [b for b in hook_string.split('/') if b]
        resource_pattern = hook[-1]
        stack_id = args.stack

        hook_utils.clear_wildcard_hooks(heat_client, stack_id, hook[:-1],
                                        hook_type, resource_pattern)