import time
import logging
import os
import json
from configparser import ConfigParser
from pathlib import Path
from queue import Queue
from initialise_app import initialise_app
from cron import cronjob
from bandwidth import measure as measure_bandwidth
from database import connect


# load default values
config = ConfigParser()
config.read(Path(__file__).parent / 'defaults.ini')
USER_ID = int(config.get('main', 'user_id'))
REPLICATES = int(config.get('main', 'replicates'))
SCHEDULE = config.get('cron', 'schedule')
TZ = config.get('cron', 'tz')


def flush_data(
    data_queue: Queue,
    user_id: int
) -> None:
    # connect to database
    db = connect()
    # stop early
    queue_size = data_queue.qsize()
    if queue_size == 0:
        logging.debug('queue already empty')
        logging.debug('finished')
        return
    # flush queue
    for i in range(queue_size):
        # get data
        data = data_queue.get()
        # prepare payload
        payload_dict = {
            'user_id': user_id,
            'data': data
        }
        # send to database
        try:
            db_id = db.insert_one(payload_dict).inserted_id
        except Exception as e:
            data_queue.put(data)    # put data back in queue
            logging.error('failed sending data to database')
            logging.debug(
                'failed pushing to database:\n'
                f'{json.dumps(payload_dict, indent=4)}\n'
                f'with error: {e}'
            )
            continue
        else:
            logging.debug(f'data sent to database received id: {db_id}')
    logging.debug('finished')


def event(
    data_queue: Queue,
    user_id: int,
    replicates: int = REPLICATES
) -> None:
    # run event
    for rep_num in range(replicates):
        logging.debug(f'running replicate {rep_num+1} of {replicates}')
        # do measurement
        try:
            data = measure_bandwidth()
        except Exception as e:
            logging.error(f'failed to measure bandwidth: {e}')
            continue
        # add data to queue
        data_queue.put(data)
        # polite pause
        time.sleep(1)
    # flush queue
    flush_data(
        data_queue=data_queue,
        user_id=user_id
    )
    logging.debug('finished')


if __name__ == '__main__':
    # setup
    initialise_app()
    data_queue: Queue = Queue()
    user_id = int(os.getenv('USER_ID', default=USER_ID))
    replicates = int(os.getenv('REPLICATES', default=REPLICATES))
    schedule = os.getenv(
        key='SCHEDULE',
        default=SCHEDULE
    )
    tz = os.getenv(
        key='TZ',
        default=TZ
    )

    @cronjob(schedule=schedule, tz=tz)
    def main_loop(
        data_queue: Queue,
        user_id: int,
        replicates: int = REPLICATES
    ) -> None:
        # run event
        for rep_num in range(replicates):
            logging.debug(f'running replicate {rep_num+1} of {replicates}')
            # do measurement
            try:
                data = measure_bandwidth()
            except Exception as e:
                logging.error(f'failed to measure bandwidth: {e}')
                continue
            # add data to queue
            data_queue.put(data)
            # polite pause
            time.sleep(1)
        # flush queue
        flush_data(
            data_queue=data_queue,
            user_id=user_id
        )
        logging.debug('finished')
    # start main loop
    main_loop(
        data_queue=data_queue,
        user_id=user_id,
        replicates=replicates
    )