# Copyright 2021-2023 H2020 TeraFlow (https://www.teraflow-h2020.eu/)
#
# 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.

from questdb.ingress import Sender, IngressError
import requests
import json
import logging
import datetime
from common.tools.timestamp.Converters import timestamp_float_to_string

LOGGER = logging.getLogger(__name__)

class MetricsDB():
  def __init__(self, host, ilp_port, rest_port, table):
    self.host=host
    self.ilp_port=int(ilp_port)
    self.rest_port=rest_port
    self.table=table
    self.create_table()

  def write_KPI(self,time,kpi_id,kpi_sample_type,device_id,endpoint_id,service_id,kpi_value):
    counter=0
    number_of_retries=10
    while (counter<number_of_retries):
      try:
        with Sender(self.host, self.ilp_port) as sender:
          sender.row(
          self.table,
          symbols={
              'kpi_id': kpi_id,
              'kpi_sample_type': kpi_sample_type,
              'device_id': device_id,
              'endpoint_id': endpoint_id,
              'service_id': service_id},
          columns={
              'kpi_value': kpi_value},
          at=datetime.datetime.fromtimestamp(time))
          sender.flush()
        counter=number_of_retries
        LOGGER.info(f"KPI written")
      except IngressError as ierr:
        # LOGGER.info(ierr)
        # LOGGER.info(f"Retry number {counter}")
        counter=counter+1


  def run_query(self, sql_query):
    query_params = {'query': sql_query, 'fmt' : 'json'}
    url = f"http://{self.host}:{self.rest_port}/exec"
    response = requests.get(url, params=query_params)
    json_response = json.loads(response.text)
    LOGGER.info(f"Query executed, result:{json_response}")
    return json_response
  
  def create_table(self):
    query = f'CREATE TABLE IF NOT EXISTS {self.table}'\
    '(kpi_id SYMBOL,'\
    'kpi_sample_type SYMBOL,'\
    'device_id SYMBOL,'\
    'endpoint_id SYMBOL,'\
    'service_id SYMBOL,'\
    'timestamp TIMESTAMP,'\
    'kpi_value DOUBLE)'\
    'TIMESTAMP(timestamp);'
    self.run_query(query)
    LOGGER.info(f"Table {self.table} created")

  def get_subscription_data(self, subs_queue, kpi_id, end_date, sampling_interval_s, callback_return):
      str_end_date = str(end_date.isoformat()) + 'Z'
      print("str_end_date: " + str_end_date)
      start_date = end_date - datetime.timedelta(seconds=sampling_interval_s)
      str_start_date = str(start_date.isoformat()) + 'Z'
      print("str_start_date: " + str(str_start_date))
      # query = f"SELECT kpi_id, timestamp, kpi_value FROM {self.table} WHERE kpi_id = '{kpi_id}' AND (timestamp BETWEEN '2022-09-28T07:21:26.595586Z' AND '2022-09-28T07:32:34.197792Z')"
      query = f"SELECT kpi_id, timestamp, kpi_value FROM {self.table} WHERE kpi_id = '{kpi_id}' AND (timestamp BETWEEN '{str_start_date}' AND '{str_end_date}')"
      response=self.run_query(query)
      kpi_list=response['dataset']
      # print(kpi_list)
      subs_queue.put_nowait(kpi_list)
      # return kpi_list
      if callback_return:
          callback_return(kpi_list)
      
