# Copyright 2014 StackStorm, Inc.
# 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 json

from cliff.command import Command as BaseCommand
from cliff.lister import Lister as ListCommand
from cliff.show import ShowOne as ShowCommand

from mistralclient.openstack.common import log as logging
from mistralclient.api.executions import ExecutionManager

LOG = logging.getLogger(__name__)


def format(execution=None):
    columns = (
        'ID',
        'Workbook',
        'Task',
        'State'
    )

    if execution:
        data = (
            execution.id,
            execution.workbook_name,
            execution.task,
            execution.state
        )
    else:
        data = (tuple('<none>' for _ in range(len(columns))),)

    return (columns, data)


class List(ListCommand):
    "List all executions"

    def get_parser(self, prog_name):
        parser = super(List, self).get_parser(prog_name)
        parser.add_argument(
            'workbook',
            help='Execution workbook')

        return parser

    def take_action(self, parsed_args):
        data = [format(execution)[1] for execution
                in ExecutionManager(self.app.client)
                .list(parsed_args.workbook)]

        if data:
            return (format()[0], data)
        else:
            return format()


class Get(ShowCommand):
    "Show specific execution"

    def get_parser(self, prog_name):
        parser = super(Get, self).get_parser(prog_name)
        parser.add_argument(
            'workbook',
            help='Execution workbook')
        parser.add_argument(
            'id',
            help='Execution identifier')

        return parser

    def take_action(self, parsed_args):
        execution = ExecutionManager(self.app.client)\
            .get(parsed_args.workbook, parsed_args.id)

        return format(execution)


class Create(ShowCommand):
    "Create new execution"

    def get_parser(self, prog_name):
        parser = super(Create, self).get_parser(prog_name)
        parser.add_argument(
            'workbook',
            help='Execution workbook')
        parser.add_argument(
            'task',
            help='Execution task')
        parser.add_argument(
            'context',
            help='Execution context')

        return parser

    def take_action(self, parsed_args):
        try:
            ctx = json.loads(parsed_args.context)
        except:
            ctx = open(parsed_args.context).read()

        execution = ExecutionManager(self.app.client)\
            .create(parsed_args.workbook,
                    parsed_args.task,
                    ctx)

        return format(execution)


class Delete(BaseCommand):
    "Delete execution"

    def get_parser(self, prog_name):
        parser = super(Delete, self).get_parser(prog_name)
        parser.add_argument(
            'workbook',
            help='Execution workbook')
        parser.add_argument(
            'id',
            help='Execution identifier')

        return parser

    def take_action(self, parsed_args):
        ExecutionManager(self.app.client)\
            .delete(parsed_args.workbook, parsed_args.id)


class Update(ShowCommand):
    "Update execution"

    def get_parser(self, prog_name):
        parser = super(Update, self).get_parser(prog_name)
        parser.add_argument(
            'workbook',
            help='Execution workbook')
        parser.add_argument(
            'id',
            help='Execution identifier')
        parser.add_argument(
            'state',
            choices=['RUNNING', 'SUSPENDED', 'STOPPED', 'SUCCESS', 'ERROR'],
            help='Execution state')

        return parser

    def take_action(self, parsed_args):
        execution = ExecutionManager(self.app.client)\
            .update(parsed_args.workbook,
                    parsed_args.id,
                    parsed_args.state)

        return format(execution)