#!/usr/bin/env python3
# -*-coding:UTF-8 -*
"""
This Module is used for term frequency.
It processes every paste coming from the global module and test the regexs
supplied in  the term webpage.

"""
import redis
import time
from pubsublogger import publisher
from packages import Paste
import calendar
import re
import signal
import time
from Helper import Process
# Email notifications
from NotificationHelper import *


class TimeoutException(Exception):
    pass


def timeout_handler(signum, frame):
    raise TimeoutException

signal.signal(signal.SIGALRM, timeout_handler)

# Config Variables
DICO_REFRESH_TIME = 60  # s

BlackListTermsSet_Name = "BlackListSetTermSet"
TrackedTermsSet_Name = "TrackedSetTermSet"
TrackedRegexSet_Name = "TrackedRegexSet"

top_term_freq_max_set_cardinality = 20  # Max cardinality of the terms frequences set
oneDay = 60*60*24
top_termFreq_setName_day = ["TopTermFreq_set_day_", 1]
top_termFreq_setName_week = ["TopTermFreq_set_week", 7]
top_termFreq_setName_month = ["TopTermFreq_set_month", 31]
top_termFreq_set_array = [top_termFreq_setName_day, top_termFreq_setName_week, top_termFreq_setName_month]

TrackedTermsNotificationTagsPrefix_Name = "TrackedNotificationTags_"

# create direct link in mail
full_paste_url = "/showsavedpaste/?paste="


def refresh_dicos():
    dico_regex = {}
    dico_regexname_to_redis = {}
    for regex_str in server_term.smembers(TrackedRegexSet_Name):
        dico_regex[regex_str[1:-1]] = re.compile(regex_str[1:-1])
        dico_regexname_to_redis[regex_str[1:-1]] = regex_str

    return dico_regex, dico_regexname_to_redis

if __name__ == "__main__":
    publisher.port = 6380
    publisher.channel = "Script"

    config_section = 'RegexForTermsFrequency'
    p = Process(config_section)
    max_execution_time = p.config.getint(config_section, "max_execution_time")

    # REDIS #
    server_term = redis.StrictRedis(
        host=p.config.get("ARDB_TermFreq", "host"),
        port=p.config.get("ARDB_TermFreq", "port"),
        db=p.config.get("ARDB_TermFreq", "db"),
        decode_responses=True)

    # FUNCTIONS #
    publisher.info("RegexForTermsFrequency script started")

    # create direct link in mail
    full_paste_url = p.config.get("Notifications", "ail_domain") + full_paste_url

    # compile the regex
    dico_refresh_cooldown = time.time()
    dico_regex, dico_regexname_to_redis = refresh_dicos()

    message = p.get_from_set()

    # Regex Frequency
    while True:

        if message is not None:
            if time.time() - dico_refresh_cooldown > DICO_REFRESH_TIME:
                dico_refresh_cooldown = time.time()
                dico_regex, dico_regexname_to_redis = refresh_dicos()
                print('dico got refreshed')

            filename = message
            temp = filename.split('/')
            timestamp = calendar.timegm((int(temp[-4]), int(temp[-3]), int(temp[-2]), 0, 0, 0))

            curr_set = top_termFreq_setName_day[0] + str(timestamp)
            paste = Paste.Paste(filename)
            content = paste.get_p_content()

            # iterate the word with the regex
            for regex_str, compiled_regex in dico_regex.items():

                signal.alarm(max_execution_time)
                try:
                    matched = compiled_regex.search(content)
                except TimeoutException:
                    print ("{0} processing timeout".format(paste.p_rel_path))
                    continue
                else:
                    signal.alarm(0)

                if matched is not None:  # there is a match
                    print('regex matched {}'.format(regex_str))
                    matched = matched.group(0)
                    regex_str_complete = "/" + regex_str + "/"
                    # Add in Regex track set only if term is not in the blacklist
                    if regex_str_complete not in server_term.smembers(BlackListTermsSet_Name):
                        # Send a notification only when the member is in the set
                        if regex_str_complete in server_term.smembers(TrackedTermsNotificationEnabled_Name):

                            # create mail body
                            mail_body = ("AIL Framework,\n"
                                         "New occurrence for regex: " + regex_str + "\n"
                                         ''+full_paste_url + filename)

                            # Send to every associated email adress
                            for email in server_term.smembers(TrackedTermsNotificationEmailsPrefix_Name + regex_str_complete):
                                sendEmailNotification(email, 'Term', mail_body)

                        # tag paste
                        for tag in server_term.smembers(TrackedTermsNotificationTagsPrefix_Name + regex_str_complete):
                            msg = '{};{}'.format(tag, filename)
                            p.populate_set_out(msg, 'Tags')

                        set_name = 'regex_' + dico_regexname_to_redis[regex_str]
                        new_to_the_set = server_term.sadd(set_name, filename)
                        new_to_the_set = True if new_to_the_set == 1 else False

                        # consider the num of occurence of this term
                        regex_value = int(server_term.hincrby(timestamp, dico_regexname_to_redis[regex_str], int(1)))
                        # 1 term per paste
                        if new_to_the_set:
                            regex_value_perPaste = int(server_term.hincrby("per_paste_" + str(timestamp), dico_regexname_to_redis[regex_str], int(1)))
                            server_term.zincrby("per_paste_" + curr_set, dico_regexname_to_redis[regex_str], float(1))
                    server_term.zincrby(curr_set, dico_regexname_to_redis[regex_str], float(1))
                else:
                    pass

        else:
            publisher.debug("Script RegexForTermsFrequency is Idling")
            print("sleeping")
            time.sleep(5)
        message = p.get_from_set()