#!/usr/bin/python3

import imaplib
import email
import datetime
import os
from pathlib import Path

##  constants
UNREADDAYS = 3
FILE_SMS = '/tmp/emailcheck.sms'
FILE_WARNING = '/tmp/emailcheck.warning'
FILE_ESCALATE = '/tmp/emailcheck.ESCALATE'

def write_file(path, text):
    file1 = open(path, "w")
    file1.write(text)
    file1.close()


# calculate date 3 days ago
threedaysago = datetime.datetime.now() - datetime.timedelta(days = UNREADDAYS)
threedaysago_str = threedaysago.strftime('(SINCE "%d-%b-%Y")')
# print(threedaysago_str)

# Connect to inbox
imap_server = imaplib.IMAP4_SSL(host='imap.strato.com')
imap_server.login('ignace@suy.nl', 'Ghdjh&653gh*')
imap_server.select()  # Default is `INBOX`

#Search for all UIDs first
result1, data1 = imap_server.uid('search', threedaysago_str)
mails_total = len(data1[0].split())

result2, data2 = imap_server.uid('search', threedaysago_str, 'UNSEEN')
mails_unseen = len(data2[0].split())

print("{} mails {}, {}=={}".format(datetime.datetime.now(), threedaysago_str, mails_total, mails_unseen))

# print("{} {}".format(mails_total, mails_unseen))
if (mails_total > mails_unseen) or (mails_total == 0):
    # some mail has been read in the past days, all is well
    # delete sms file, warning file 
    if os.path.exists(FILE_SMS):
        os.remove(FILE_SMS)
    if os.path.exists(FILE_WARNING):
        os.remove(FILE_WARNING)
    if os.path.exists(FILE_ESCALATE):
        os.remove(FILE_ESCALATE)
    print("  ->Ok")
else:
    # no mails have been read in the past days
    # check if a earlier warning file has been created
    if os.path.exists(FILE_WARNING):
        if (not os.path.exists(FILE_ESCALATE)):
            # serious shit, escalate
            write_file(FILE_ESCALATE, "Escalation has taken place")
            write_file(FILE_SMS, "SUY-CLOUD: You have received a mail from cloudserver@suy.nl - please check!.")
            print("  ->Escalate")
    else:
        # create a warning file
        write_file(FILE_WARNING, "In another half day, if no email is read, escalation will take place")
        write_file(FILE_SMS, "SUY-CLOUD: You have not read mail for 3 days, do this immediately pls or escalate.")
        print("  ->Warning")