import datetime
import base64
import os
import glob
import functools
import sys

from Crypto.Cipher import AES

monthDict = {'Jan': 1, 'Feb': 2, 'Mar': 3, 'Apr': 4, 'May': 5, 'Jun': 6, 'Jul': 7, 'Aug': 8, 'Sep':9, 'Oct':10, 'Nov': 11, 'Dec' : 12}


def readAndProcess(fileName):
    f = open(fileName, 'r')
    return processAppTimes(f.read().split('\n'))

def processAppTimes(fileContent):
#     fileContent = fileContent.split('\n')
    fileContent = [line.split(' ') for line in fileContent if len(line.strip()) > 0]

    # dictionary to accumulate the seconds for each application
    appDict = {}


    # for each line in the text file, extract the tokens, compute the time diff
    # and accumulate in dictionary

    isFirst = True
    for event in fileContent:
#         print("evenToken:", tokenTime)
#         print (event[tokenTime])
        (hour, minutes, seconds) = event[tokenTime].split(':') 
        
        (year, month, day) = (int(event[tokenYear]), monthDict[event[tokenMonth]],int(event[tokenDay]))
        currDateTime = datetime.datetime(year, month, day, int(hour), int(minutes), int(seconds)) 
#         print(event, currDateTime, event[tokenApp])
        if (not isFirst):
            timeDelta = currDateTime - prevDateTime 
#             print(timeDelta, prevApp)
            if prevApp in appDict:
                appDict[prevApp] = appDict[prevApp] + timeDelta.seconds 
            else:
                appDict[prevApp] = 0 + timeDelta.seconds
        else:
            isFirst = False
        prevDateTime = currDateTime
        prevApp = event[tokenApp]

    return appDict

def decryptFileAndProcess(encryptedFName):
    key = "This is a secret"

    f = open(encryptedFName, 'rb')
    print("Decrypting the file: %s ..." % encryptedFName)
    
    cipher = AES.new(key)
    decrypted = cipher.decrypt(f.read())
    fileContent = decrypted.decode("utf-8").split("\n")

    # positions of tokens in each line

    # print("Is this a time? ", fileContent[0][tokenTime])
    # print("Is this a year month day? ", fileContent[0][tokenYear], fileContent[0][tokenMonth], fileContent[0][tokenDay])
    # print("If not, modify the token values....")
#     print(fileContent)
#     print([line for line in fileContent if len(line) > 10])
    return processAppTimes([line for line in fileContent if len(line) > 10])



def latestUserFile(searchDir, userID):
    # search_dir = "/tmp/images/"
    print("Searching dir %s for latest file of userID: %s ...." % (searchDir, userID))
    files = [f for f in glob.glob(searchDir + "/" +  userID + "-*") if os.path.isfile(f)]
    return max(files, key = lambda x: os.path.getmtime(x))



if len(sys.argv) != 3:
	print("Usage: " + sys.argv[0] + " (directory) (UserID)")
	print("Example: " + sys.argv[0] + " /tmp/images 1000")
	sys.exit(1)

searchDir = sys.argv[1]
userID = sys.argv[2]

(tokenApp,tokenMonth, tokenDay, tokenYear, tokenTime) = (0,3,4,7,5)
# print(latestUserFile(searchDir,userID))
results = decryptFileAndProcess( latestUserFile(searchDir,userID))

print("Results:\n",results)
# print(decryptFileAndProcess( latestUserFile("5000")))