##############################################################################
# Copyright (c) 2016 Huawei Technologies Co.,Ltd and others.
#
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Apache License, Version 2.0
# which accompanies this distribution, and is available at
# http://www.apache.org/licenses/LICENSE-2.0
##############################################################################
from __future__ import absolute_import
import logging
import uuid
import json

from api.utils.common import result_handler
from api.database.v1.handlers import TasksHandler
from yardstick.common import constants as consts

logger = logging.getLogger(__name__)
logger.setLevel(logging.DEBUG)


def default(args):
    return getResult(args)


def getResult(args):
    try:
        task_id = args['task_id']
    except KeyError:
        return result_handler(consts.API_ERROR, 'task_id must be provided')

    try:
        uuid.UUID(task_id)
    except ValueError:
        return result_handler(consts.API_ERROR, 'invalid task_id')

    task_handler = TasksHandler()
    try:
        task = task_handler.get_task_by_taskid(task_id)
    except ValueError:
        return result_handler(consts.API_ERROR, 'invalid task_id')

    def _unfinished():
        return result_handler(consts.TASK_NOT_DONE, {})

    def _finished():
        if task.result:
            return result_handler(consts.TASK_DONE, json.loads(task.result))
        else:
            return result_handler(consts.TASK_DONE, {})

    def _error():
        return result_handler(consts.TASK_FAILED, task.error)

    status = task.status
    logger.debug('Task status is: %s', status)

    if status not in [consts.TASK_NOT_DONE,
                      consts.TASK_DONE,
                      consts.TASK_FAILED]:
        return result_handler(consts.API_ERROR, 'internal server error')

    switcher = {
        consts.TASK_NOT_DONE: _unfinished,
        consts.TASK_DONE: _finished,
        consts.TASK_FAILED: _error
    }

    return switcher.get(status)()