import os
import datetime
from collections import deque

# open numbered log files and evaluate the results
# the log files have been copied from the server to this directory
# the log files are named log-NSWMessageService.txt.0, log-NSWMessageService.txt.1, log-NSWMessageService.txt.2, ...
# for the first analysis I have copied 10 log files to this directory but placed them in the .gitignore file

# get the current working directory

abspath = os.path.abspath(__file__)
dname = os.path.dirname(abspath)

outputFileNameDBH = dname + "\\" + 'output_dbh.csv'
outputFileNameHISNORD = dname + "\\" + 'output_hisnord.csv'

# open the output files
outputFileDBH = open(outputFileNameDBH, 'w')
outputFileHISNORD = open(outputFileNameHISNORD, 'w')

# write the header

outputFileDBH.write('Receive time, Duration, Message class, Attempts\n')
outputFileHISNORD.write('Receive time, Duration, message class, Attemps\n')

# open the log files

q = deque()

for i in range(1, -1, -1):
    logFileName = dname + "\\" + 'log-NSWMessageService.txt.' + str(i)
    logFile = open(logFileName, 'r')

    # read the content line by line
    while True:
        line = logFile.readline()
        if not line:
            break

        # get substring of the date
        dateString = line[0:19]


        # kept old code for reference, but it does nothing
        if "Upload of" in line:
            # add the dateString to the queue
            q.appendleft(dateString)

        elif "Download of" in line:
            # find the corresponding dateString in the queue
            # calculate the duration
            # remove the dateString from the queue
            lastdatestring = q.pop()

            # create date from string
            lastdate = datetime.datetime.strptime(lastdatestring, '%Y-%m-%d %H:%M:%S')
            currentdate = datetime.datetime.strptime(dateString, '%Y-%m-%d %H:%M:%S')

            # calculate the duration
            duration = currentdate - lastdate

            # outputFile.write(dateString + "," + str(duration.seconds) + "\n")

        if "MessageTelemetry" in line:
            his = line[72:81].strip()
            msg_class = line[83:91].strip()
            duration = line[93:98]
            tries = line[100:102]
            if his == 'DUDR':
                outputFileHISNORD.write(dateString + "," + duration + "," + msg_class + "," + tries + "\n")
            elif his == 'DBH':
                outputFileDBH.write(dateString + "," + duration + "," + msg_class + "," + tries + "\n")

    # close the log file
    logFile.close()

outputFileDBH.close()
outputFileHISNORD.close()