#!/usr/bin/env python

# Copyright (c) 2017 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

"""
Resources to retrieve the task results
"""

import errno
import json
import logging
import os
import uuid

from flask import jsonify

from functest.api.base import ApiResource
from functest.api.common import api_utils
from functest.api.database.v1.handlers import TasksHandler
from functest.utils.constants import CONST


LOGGER = logging.getLogger(__name__)


class V1Task(ApiResource):
    """ V1Task Resource class"""

    def get(self, task_id):  # pylint: disable=no-self-use
        """ GET the result of the task id """
        try:
            uuid.UUID(task_id)
        except ValueError:
            return api_utils.result_handler(status=1, data='Invalid task id')

        task_handler = TasksHandler()
        try:
            task = task_handler.get_task_by_taskid(task_id)
        except ValueError:
            return api_utils.result_handler(status=1, data='No such task id')

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

        if status not in ['IN PROGRESS', 'FAIL', 'FINISHED']:
            return api_utils.result_handler(status=1,
                                            data='internal server error')

        switcher = {'IN PROGRESS': 0, 'FAIL': 1, 'FINISHED': 2}
        if status == 'IN PROGRESS':
            result = {'status': switcher.get(status), 'result': ''}
        elif status == 'FAIL':
            result = {'status': switcher.get(status), 'error': task.error}
        else:
            result = {'status': switcher.get(status),
                      'result': json.loads(task.result)}

        return jsonify(result)


class V1TaskLog(ApiResource):
    """ V1TaskLog Resource class"""

    def get(self, task_id):  # pylint: disable=no-self-use
        """ GET the log of the task id """
        try:
            uuid.UUID(task_id)
        except ValueError:
            return api_utils.result_handler(status=1, data='Invalid task id')

        task_handler = TasksHandler()
        try:
            task = task_handler.get_task_by_taskid(task_id)
        except ValueError:
            return api_utils.result_handler(status=1, data='No such task id')

        task_log_dir = CONST.__getattribute__('dir_results')

        try:
            with open(os.path.join(task_log_dir,
                                   '{}.log'.format(task_id)), 'r') as log_file:
                data = log_file.readlines()
        except OSError as err:
            if err.errno == errno.ENOENT:
                return api_utils.result_handler(
                    status=1, data='Log file does not exist')

            return api_utils.result_handler(
                status=1, data='Error with log file')

        return_data = {'data': data}

        switcher = {'IN PROGRESS': 0, 'FAIL': 1, 'FINISHED': 2}

        return api_utils.result_handler(status=switcher.get(task.status),
                                        data=return_data)

@@ -2522,16 +2522,112 @@
 esults')
+%0A        # pylint: disable=maybe-no-member%0A        index = int(self._get_args().get('index', 0))
 %0A%0A      
@@ -2762,16 +2762,53 @@
 g_file:%0A
+                log_file.seek(index)%0A
         
@@ -2843,16 +2843,56 @@
 lines()%0A
+                index = log_file.tell()%0A
         
@@ -3164,24 +3164,24 @@
 log file')%0A%0A
-
         retu
@@ -3203,16 +3203,32 @@
 a': data
+, 'index': index
 %7D%0A%0A     

Allow reading log file with byte offset