# Copyright 2015 Hewlett-Packard
#
# 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 os
import signal
import socket

from freezerclient import exceptions
from oslo_log import log
from oslo_serialization import jsonutils as json
from oslo_utils import uuidutils
import psutil


LOG = log.getLogger(__name__)

CONFIG_FILE_EXT = '.conf'


def do_register(client, args=None):
    if client:
        client_info = {
            "client_id": client.client_id,
            "hostname": socket.gethostname()
        }
        try:
            client.clients.create(client_info)
        except exceptions.ApiClientException as e:
            if e.status_code == 409:
                print("Client already registered")
            return 73  # os.EX_CANTCREAT
        return 0  # os.EX_OK


def find_config_files(path):
    expanded_path = os.path.expanduser(path)
    if os.path.isfile(expanded_path):
        return [expanded_path]
    file_list = []
    if os.path.isdir(expanded_path):
        for fname in os.walk(expanded_path).next()[2]:
            if CONFIG_FILE_EXT.upper() == os.path.splitext(fname)[1].upper():
                file_list.append('{0}/{1}'.format(expanded_path, fname))
        return file_list
    raise Exception("unable to find job files at the provided path "
                    "{0}".format(path))


def load_doc_from_json_file(fname, debug=False):
    with open(fname, 'rb') as fd:
        try:
            doc = json.load(fd)
        except Exception as e:
            raise Exception("Unable to load conf file. {0}".format(e))
        if debug:
            print("File {0} loaded: ".format(fname))
        return doc


def save_doc_to_json_file(doc, fname, debug=False):
    with open(fname, 'w') as fd:
        json.dump(doc, fd, indent=4)
    if debug:
        print('Saved doc to file: {0}'.format(fname))


def get_jobs_from_disk(path):
    job_doc_list = [
        load_doc_from_json_file(f) for f in find_config_files(path)]
    for job_doc in job_doc_list:
        if job_doc:
            job_doc['job_id'] = job_doc.get('job_id', uuidutils.generate_uuid(
                dashed=False))
    return [x for x in job_doc_list if x]


def save_jobs_to_disk(job_doc_list, path):
    for doc in job_doc_list:
        fname = os.path.normpath('{0}/job_{1}.conf'.
                                 format(path, doc['job_id']))
        save_doc_to_json_file(doc, fname)


def get_active_jobs_from_api(client):
    # might raise
    search = {"match_not": [{"status": "completed"}]}
    job_list, offset = [], 0
    while True:
        jobs = client.jobs.list(limit=10, offset=offset, search=search)
        job_list.extend(jobs)
        if len(jobs) < 10:
            break
        offset += len(jobs)
    return job_list


def terminate_subprocess(pid, name):
    try:
        process = psutil.Process(pid)
        if process.name.startswith(name):
            os.kill(pid, signal.SIGTERM)
        else:
            LOG.warning('The name {} does not match the pid {}'.format(
                name, pid))
    except Exception:
        LOG.debug('Process {} does not exists anymore'.format(pid))