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#!/usr/bin/env python3
# ============LICENSE_START=======================================================
# Copyright 2018-2020 AT&T Intellectual Property, Inc. All rights reserved.
# Copyright (c) 2019 Pantheon.tech. All rights reserved.
# Copyright 2020 Deutsche Telekom. All rights reserved.
# Copyright 2021 Fujitsu Ltd.
# ================================================================================
# 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.
# ============LICENSE_END=========================================================
#
#  Author  Prakash Hosangady(ph553f@att.com)
#    Simple Microservice
#    Tracks Heartbeat messages on input topic in DMaaP
#    and poppulate the information in postgres DB

import psycopg2
import requests
import os
import os.path as path
import json
import sys
import time
import misshtbtd as db
import get_logger

_logger = get_logger.get_logger(__name__)


def read_json_file(i, prefix="../../tests"):
    if (i == 0):
        with open(path.abspath(path.join(__file__, f"{prefix}/test1.json")), "r") as outfile:
            cfg = json.load(outfile)
    elif (i == 1):
        with open(path.abspath(path.join(__file__, f"{prefix}/test2.json")), "r") as outfile:
            cfg = json.load(outfile)
    elif (i == 2):
        with open(path.abspath(path.join(__file__, f"{prefix}/test3.json")), 'r') as outfile:
            cfg = json.load(outfile)
    return cfg


def process_msg(jsfile, user_name, password, ip_address, port_num, db_name):
    global mr_url
    i = 0
    sleep_duration = 20
    while (True):
        time.sleep(sleep_duration)
        with open(jsfile, 'r') as outfile:
            cfg = json.load(outfile)
        mr_url = str(cfg['streams_subscribes']['ves-heartbeat']['dmaap_info']['topic_url'])

        while (True):
            hbc_pid, hbc_state, hbc_srcName, hbc_time = db.read_hb_common(user_name, password, ip_address, port_num, db_name)
            if (hbc_state == "RECONFIGURATION"):
                _logger.info("HBT:Waiting for hb_common state to become RUNNING")
                time.sleep(10)
            else:
                break

        if (os.getenv('pytest', "") == 'test'):
            eventnameList = ["Heartbeat_vDNS", "Heartbeat_vFW", "Heartbeat_xx"]
            connection_db = 0
        else:
            connection_db = postgres_db_open(user_name, password, ip_address, port_num, db_name)
            cur = connection_db.cursor()
            db_query = "Select event_name from vnf_table_1"
            cur.execute(db_query)
            eventnameList = [item[0] for item in cur.fetchall()]
        msg = "\n\nHBT:eventnameList values ", eventnameList
        _logger.info(msg)
        if "groupID" not in os.environ or "consumerID" not in os.environ:
            get_url = mr_url + '/DefaultGroup/1?timeout=15000'
        else:
            get_url = mr_url + '/' + os.getenv('groupID', "") + '/' + os.getenv('consumerID', "") + '?timeout=15000'
        msg = "HBT:Getting :" + get_url
        _logger.info(msg)

        if (os.getenv('pytest', "") == 'test'):
            jsonobj = read_json_file(i)
            jobj = []
            jobj.append(jsonobj)
            i = i + 1
            msg = "HBT:newly received test message", jobj
            _logger.info(msg)
            if (i >= 3):
                i = 0
                break
        else:
            res = requests.get(get_url)
            msg = "HBT:", res.text
            _logger.info(msg)
            inputString = res.text
            # If mrstatus in message body indicates some information, not json msg.
            if ("mrstatus" in inputString):
                continue
            jlist = inputString.split('\n');
            # Process the DMaaP input message retreived
            error = False
            for line in jlist:
                try:
                    jobj = json.loads(line)
                except ValueError:
                    msg = 'HBT:Decoding JSON has failed'
                    _logger.error(msg)
                    error = True
                    break
            if (error == True):
                continue
            if len(jobj) == 0:
                continue
        for item in jobj:
            try:
                if (os.getenv('pytest', "") == 'test'):
                    jitem = jsonobj
                else:
                    jitem = json.loads(item)
                srcname = (jitem['event']['commonEventHeader']['sourceName'])
                lastepo = (jitem['event']['commonEventHeader']['lastEpochMicrosec'])
                seqnum = (jitem['event']['commonEventHeader']['sequence'])
                eventName = (jitem['event']['commonEventHeader']['eventName'])
            except(Exception) as err:
                msg = "HBT message process error - ", err
                _logger.error(msg)
                continue
            msg = "HBT:Newly received HB event values ::", eventName, lastepo, srcname
            _logger.info(msg)
            if (db_table_creation_check(connection_db, "vnf_table_2") == False):
                msg = "HBT:Creating vnf_table_2"
                _logger.info(msg)
                cur.execute("CREATE TABLE vnf_table_2 (EVENT_NAME varchar , SOURCE_NAME_KEY integer , PRIMARY KEY(EVENT_NAME,SOURCE_NAME_KEY),LAST_EPO_TIME BIGINT, SOURCE_NAME varchar, CL_FLAG integer);")
            else:
                msg = "HBT:vnf_table_2 is already there"
                _logger.info(msg)
            if (eventName in eventnameList):  # pragma: no cover
                db_query = "Select source_name_count from vnf_table_1 where event_name='%s'" % (eventName)
                msg = "HBT:", db_query
                _logger.info(msg)
                if (os.getenv('pytest', "") == 'test'):
                    break
                cur.execute(db_query)
                row = cur.fetchone()
                source_name_count = row[0]
                source_name_key = source_name_count + 1
                cl_flag = 0
                if (source_name_count == 0):  # pragma: no cover
                    msg = "HBT: Insert entry in table_2,source_name_count=0 : ", row
                    _logger.info(msg)
                    query_value = "INSERT INTO vnf_table_2 VALUES('%s',%d,%d,'%s',%d);" % (
                    eventName, source_name_key, lastepo, srcname, cl_flag)
                    cur.execute(query_value)
                    update_query = "UPDATE vnf_table_1 SET SOURCE_NAME_COUNT='%d' where EVENT_NAME ='%s'" % (
                    source_name_key, eventName)
                    cur.execute(update_query)
                else:  # pragma: no cover
                    msg = "HBT:event name, source_name & source_name_count are", eventName, srcname, source_name_count
                    _logger.info(msg)
                    for source_name_key in range(source_name_count):
                        epoc_query = "Select source_name from vnf_table_2 where event_name= '%s' and source_name_key=%d" % (eventName, (source_name_key + 1))
                        msg = "HBT:eppc query is", epoc_query
                        _logger.info(msg)
                        cur.execute(epoc_query)
                        row = cur.fetchall()
                        if (len(row) == 0):
                            continue
                        db_srcname = row[0][0]
                        if (db_srcname == srcname):
                            msg = "HBT: Update vnf_table_2 : ", source_name_key, row
                            _logger.info(msg)
                            update_query = "UPDATE vnf_table_2 SET LAST_EPO_TIME='%d',SOURCE_NAME='%s' where EVENT_NAME='%s' and SOURCE_NAME_KEY=%d" % (lastepo, srcname, eventName, (source_name_key + 1))
                            cur.execute(update_query)
                            source_name_key = source_name_count
                            break
                        else:
                            continue
                    msg = "HBT: The source_name_key and source_name_count are ", source_name_key, source_name_count
                    _logger.info(msg)
                    if (source_name_count == (source_name_key + 1)):
                        source_name_key = source_name_count + 1
                        msg = "HBT: Insert entry in table_2 : ", row
                        _logger.info(msg)
                        insert_query = "INSERT INTO vnf_table_2 VALUES('%s',%d,%d,'%s',%d);" % (
                        eventName, source_name_key, lastepo, srcname, cl_flag)
                        cur.execute(insert_query)
                        update_query = "UPDATE vnf_table_1 SET SOURCE_NAME_COUNT='%d' where EVENT_NAME ='%s'" % (source_name_key, eventName)
                        cur.execute(update_query)
            else:
                _logger.info("HBT:eventName is not being monitored, Igonoring JSON message")
        commit_db(connection_db)
        commit_and_close_db(connection_db)
        if (os.getenv('pytest', "") != 'test'):
            cur.close()


def postgres_db_open(username, password, host, port, database_name):
    if (os.getenv('pytest', "") == 'test'):
        return True
    connection = psycopg2.connect(database=database_name, user=username, password=password, host=host, port=port)
    return connection


def db_table_creation_check(connection_db, table_name):
    if (os.getenv('pytest', "") == 'test'):
        return True
    try:
        cur = connection_db.cursor()
        query_db = "select * from information_schema.tables where table_name='%s'" % (table_name)
        cur.execute(query_db)
        database_names = cur.fetchone()
        if (database_names is not None):
            if (table_name in database_names):
                return True
        else:
            return False


    except psycopg2.DatabaseError as e:
        msg = 'COMMON:Error %s' % e
        _logger.error(msg)
    finally:
        cur.close()


def commit_db(connection_db):
    if (os.getenv('pytest', "") == 'test'):
        return True
    try:
        connection_db.commit()  # <--- makes sure the change is shown in the database
        return True
    except psycopg2.DatabaseError as e:
        msg = 'COMMON:Error %s' % e
        _logger.error(msg)
        return False


def commit_and_close_db(connection_db):
    if (os.getenv('pytest', "") == 'test'):
        return True
    try:
        connection_db.commit()  # <--- makes sure the change is shown in the database
        connection_db.close()
        return True
    except psycopg2.DatabaseError as e:
        msg = 'COMMON:Error %s' % e
        _logger.error(msg)
        return False


if __name__ == '__main__':
    jsfile = sys.argv[1]
    msg = "HBT:HeartBeat thread Created"
    _logger.info("HBT:HeartBeat thread Created")
    msg = "HBT:The config file name passed is -%s", jsfile
    _logger.info(msg)
    ip_address, port_num, user_name, password, db_name, cbs_polling_required, cbs_polling_interval = db.read_hb_properties(jsfile)
    process_msg(jsfile, user_name, password, ip_address, port_num, db_name)