##############################################################################
# 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
##############################################################################
import logging
import threading
import subprocess
import time
import json
import os
import errno

from docker import Client

from yardstick.common import constants as config
from yardstick.common import utils as yardstick_utils
from yardstick.common.httpClient import HttpClient
from api import conf as api_conf
from api.utils import influx
from api.utils.common import result_handler

logger = logging.getLogger(__name__)


def createGrafanaContainer(args):
    thread = threading.Thread(target=_create_grafana)
    thread.start()
    return result_handler('success', [])


def _create_grafana():
    client = Client(base_url=config.DOCKER_URL)

    try:
        if not _check_image_exist(client, '%s:%s' % (config.GRAFANA_IMAGE,
                                                     config.GRAFANA_TAGS)):
            client.pull(config.GRAFANA_IMAGE, config.GRAFANA_TAGS)

        _create_grafana_container(client)

        time.sleep(5)

        _create_data_source()

        _create_dashboard()
    except Exception as e:
        logger.debug('Error: %s', e)


def _create_dashboard():
    url = 'http://admin:admin@%s:3000/api/dashboards/db' % api_conf.GATEWAY_IP
    with open('../dashboard/ping_dashboard.json') as dashboard_json:
        data = json.load(dashboard_json)
    HttpClient().post(url, data)


def _create_data_source():
    url = 'http://admin:admin@%s:3000/api/datasources' % api_conf.GATEWAY_IP
    data = {
        "name": "yardstick",
        "type": "influxdb",
        "access": "proxy",
        "url": "http://%s:8086" % api_conf.GATEWAY_IP,
        "password": "root",
        "user": "root",
        "database": "yardstick",
        "basicAuth": True,
        "basicAuthUser": "admin",
        "basicAuthPassword": "admin",
        "isDefault": False,
    }
    HttpClient().post(url, data)


def _create_grafana_container(client):
    ports = [3000]
    port_bindings = {k: k for k in ports}
    host_config = client.create_host_config(port_bindings=port_bindings)

    container = client.create_container(image='%s:%s' % (config.GRAFANA_IMAGE,
                                                         config.GRAFANA_TAGS),
                                        ports=ports,
                                        detach=True,
                                        tty=True,
                                        host_config=host_config)
    client.start(container)


def _check_image_exist(client, t):
    return any(t in a['RepoTags'][0] for a in client.images() if a['RepoTags'])


def createInfluxDBContainer(args):
    thread = threading.Thread(target=_create_influxdb)
    thread.start()
    return result_handler('success', [])


def _create_influxdb():
    client = Client(base_url=config.DOCKER_URL)

    try:
        _config_output_file()

        if not _check_image_exist(client, '%s:%s' % (config.INFLUXDB_IMAGE,
                                                     config.INFLUXDB_TAG)):
            client.pull(config.INFLUXDB_IMAGE, tag=config.INFLUXDB_TAG)

        _create_influxdb_container(client)

        time.sleep(5)

        _config_influxdb()
    except Exception as e:
        logger.debug('Error: %s', e)


def _create_influxdb_container(client):

    ports = [8083, 8086]
    port_bindings = {k: k for k in ports}
    host_config = client.create_host_config(port_bindings=port_bindings)

    container = client.create_container(image='%s:%s' % (config.INFLUXDB_IMAGE,
                                                         config.INFLUXDB_TAG),
                                        ports=ports,
                                        detach=True,
                                        tty=True,
                                        host_config=host_config)
    client.start(container)


def _config_influxdb():
    try:
        client = influx.get_data_db_client()
        client.create_user(config.USER, config.PASSWORD, config.DATABASE)
        client.create_database(config.DATABASE)
        logger.info('Success to config influxDB')
    except Exception as e:
        logger.debug('Failed to config influxDB: %s', e)


def _config_output_file():
    yardstick_utils.makedirs(config.YARDSTICK_CONFIG_DIR)
    with open(config.YARDSTICK_CONFIG_FILE, 'w') as f:
        f.write("""\
[DEFAULT]
debug = False
dispatcher = influxdb

[dispatcher_file]
file_path = /tmp/yardstick.out

[dispatcher_http]
timeout = 5
# target = http://127.0.0.1:8000/results

[dispatcher_influxdb]
timeout = 5
target = http://%s:8086
db_name = yardstick
username = root
password = root
"""
                % api_conf.GATEWAY_IP)


def prepareYardstickEnv(args):
    thread = threading.Thread(target=_prepare_env_daemon)
    thread.start()
    return result_handler('success', [])


def _prepare_env_daemon():

    installer_ip = os.environ.get('INSTALLER_IP', 'undefined')
    installer_type = os.environ.get('INSTALLER_TYPE', 'undefined')

    _check_variables(installer_ip, installer_type)

    _create_directories()

    rc_file = config.OPENSTACK_RC_FILE

    _get_remote_rc_file(rc_file, installer_ip, installer_type)

    _source_file(rc_file)

    _append_external_network(rc_file)

    # update the external_network
    _source_file(rc_file)

    _clean_images()

    _load_images()


def _check_variables(installer_ip, installer_type):

    if installer_ip == 'undefined':
        raise SystemExit('Missing INSTALLER_IP')

    if installer_type == 'undefined':
        raise SystemExit('Missing INSTALLER_TYPE')
    elif installer_type not in config.INSTALLERS:
        raise SystemExit('INSTALLER_TYPE is not correct')


def _create_directories():
    yardstick_utils.makedirs(config.YARDSTICK_CONFIG_DIR)


def _source_file(rc_file):
    yardstick_utils.source_env(rc_file)


def _get_remote_rc_file(rc_file, installer_ip, installer_type):

    os_fetch_script = os.path.join(config.RELENG_DIR, config.OS_FETCH_SCRIPT)

    try:
        cmd = [os_fetch_script, '-d', rc_file, '-i', installer_type,
               '-a', installer_ip]
        p = subprocess.Popen(cmd, stdout=subprocess.PIPE)
        p.communicate()[0]

        if p.returncode != 0:
            logger.debug('Failed to fetch credentials from installer')
    except OSError as e:
        if e.errno != errno.EEXIST:
            raise


def _append_external_network(rc_file):
    neutron_client = yardstick_utils.get_neutron_client()
    networks = neutron_client.list_networks()['networks']
    try:
        ext_network = next(n['name'] for n in networks if n['router:external'])
    except StopIteration:
        logger.warning("Can't find external network")
    else:
        cmd = 'export EXTERNAL_NETWORK=%s' % ext_network
        try:
            with open(rc_file, 'a') as f:
                f.write(cmd + '\n')
        except OSError as e:
            if e.errno != errno.EEXIST:
                raise


def _clean_images():
    cmd = [config.CLEAN_IMAGES_SCRIPT]
    p = subprocess.Popen(cmd, stdout=subprocess.PIPE,
                         cwd=config.YARDSTICK_REPOS_DIR)
    output = p.communicate()[0]
    logger.debug('The result is: %s', output)


def _load_images():
    cmd = [config.LOAD_IMAGES_SCRIPT]
    p = subprocess.Popen(cmd, stdout=subprocess.PIPE,
                         cwd=config.YARDSTICK_REPOS_DIR)
    output = p.communicate()[0]
    logger.debug('The result is: %s', output)