#!/usr/bin/env python3
# -*-coding:UTF-8 -*
"""
    Sentiment analyser module.
    It takes its inputs from 'global'.

    The content is analysed if the length of the line is
    above a defined threshold (get_p_content_with_removed_lines).
    This is done because NLTK sentences tokemnizer (sent_tokenize) seems to crash
    for long lines (function _slices_from_text line#1276).


    nltk.sentiment.vader module credit:
        Hutto, C.J. & Gilbert, E.E. (2014). VADER: A Parsimonious Rule-based Model for Sentiment Analysis of Social Media Text. Eighth International Conference on Weblogs and Social Media (ICWSM-14). Ann Arbor, MI, June 2014.

"""
import os
import sys

import time
import datetime
import calendar
import redis
import json
from pubsublogger import publisher
from Helper import Process
from packages import Paste

sys.path.append(os.path.join(os.environ['AIL_BIN'], 'lib/'))
import ConfigLoader

from nltk.sentiment.vader import SentimentIntensityAnalyzer
from nltk import tokenize

# Config Variables
accepted_Mime_type = ['text/plain']
size_threshold = 250
line_max_length_threshold = 1000

#time_clean_sentiment_db = 60*60

def Analyse(message, server):
    path = message
    paste = Paste.Paste(path)

    # get content with removed line + number of them
    num_line_removed, p_content = paste.get_p_content_with_removed_lines(line_max_length_threshold)
    provider = paste.p_source
    p_date = str(paste._get_p_date())
    p_MimeType = paste._get_p_encoding()

    # Perform further analysis
    if p_MimeType == "text/plain":
        if isJSON(p_content):
            p_MimeType = "JSON"

    if p_MimeType in accepted_Mime_type:

        the_date = datetime.date(int(p_date[0:4]), int(p_date[4:6]), int(p_date[6:8]))
        the_time = datetime.datetime.now()
        the_time = datetime.time(getattr(the_time, 'hour'), 0, 0)
        combined_datetime = datetime.datetime.combine(the_date, the_time)
        timestamp = calendar.timegm(combined_datetime.timetuple())

        sentences = tokenize.sent_tokenize(p_content)

        if len(sentences) > 0:
            avg_score = {'neg': 0.0, 'neu': 0.0, 'pos': 0.0, 'compoundPos': 0.0, 'compoundNeg': 0.0}
            neg_line = 0
            pos_line = 0
            sid = SentimentIntensityAnalyzer(sentiment_lexicon_file)
            for sentence in sentences:
                 ss = sid.polarity_scores(sentence)
                 for k in sorted(ss):
                     if k == 'compound':
                         if ss['neg'] > ss['pos']:
                             avg_score['compoundNeg'] += ss[k]
                             neg_line += 1
                         else:
                             avg_score['compoundPos'] += ss[k]
                             pos_line += 1
                     else:
                         avg_score[k] += ss[k]


            for k in avg_score:
                if k == 'compoundPos':
                    avg_score[k] = avg_score[k] / (pos_line if pos_line > 0 else 1)
                elif k == 'compoundNeg':
                    avg_score[k] = avg_score[k] / (neg_line if neg_line > 0 else 1)
                else:
                    avg_score[k] = avg_score[k] / len(sentences)


            # In redis-levelDB: {} = set, () = K-V
            # {Provider_set -> provider_i}
            # {Provider_TimestampInHour_i -> UniqID_i}_j
            # (UniqID_i -> PasteValue_i)

            server.sadd('Provider_set', provider)

            provider_timestamp = provider + '_' + str(timestamp)
            server.incr('UniqID')
            UniqID = server.get('UniqID')
            print(provider_timestamp, '->', UniqID, 'dropped', num_line_removed, 'lines')
            server.sadd(provider_timestamp, UniqID)
            server.set(UniqID, avg_score)
    else:
        print('Dropped:', p_MimeType)


def isJSON(content):
    try:
        json.loads(content)
        return True

    except Exception:
        return False

import signal

class TimeoutException(Exception):
    pass

def timeout_handler(signum, frame):
    raise TimeoutException

signal.signal(signal.SIGALRM, timeout_handler)

if __name__ == '__main__':
    # If you wish to use an other port of channel, do not forget to run a subscriber accordingly (see launch_logs.sh)
    # Port of the redis instance used by pubsublogger
    publisher.port = 6380
    # Script is the default channel used for the modules.
    publisher.channel = 'Script'

    # Section name in bin/packages/modules.cfg
    config_section = 'SentimentAnalysis'

    # Setup the I/O queues
    p = Process(config_section)

    # Sent to the logging a description of the module
    publisher.info("<description of the module>")

    config_loader = ConfigLoader.ConfigLoader()
    sentiment_lexicon_file = config_loader.get_config_str("Directories", "sentiment_lexicon_file")

    # REDIS_LEVEL_DB #
    server = config_loader.get_redis_conn("ARDB_Sentiment")
    config_loader = None

    time1 = time.time()

    while True:
        message = p.get_from_set()
        if message is None:
            #if int(time.time() - time1) > time_clean_sentiment_db:
            #    clean_db()
            #    time1 = time.time()
            #    continue
            #else:
            publisher.debug("{} queue is empty, waiting".format(config_section))
            time.sleep(1)
            continue
        signal.alarm(60)
        try:
            Analyse(message, server)
        except TimeoutException:
            p.incr_module_timeout_statistic()
            print ("{0} processing timeout".format(message))
            continue
        else:
            signal.alarm(0)