#!/usr/bin/env python2
# -*-coding:UTF-8 -*
"""
    Sentiment analyser module.
    It takes its inputs from 'global'.

    The content analysed comes from the pastes with length of the line 
    above a defined threshold removed (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 time
import datetime
import calendar
import redis
import json
from pubsublogger import publisher
from Helper import Process
from packages import Paste

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

import os
import ConfigParser

configfile = os.path.join(os.environ['AIL_BIN'], 'packages/config.cfg')
if not os.path.exists(configfile):
    raise Exception('Unable to find the configuration file. \
        Did you set environment variables? \
        Or activate the virtualenv.')

cfg = ConfigParser.ConfigParser()
cfg.read(configfile)

sentiment_lexicon_file = cfg.get("Directories", "sentiment_lexicon_file")

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.decode('utf-8', 'ignore'))
    
        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,e:
        return False

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>")

    # REDIS_LEVEL_DB #
    server = redis.StrictRedis(
        host=p.config.get("Redis_Level_DB_Sentiment", "host"),
        port=p.config.get("Redis_Level_DB_Sentiment", "port"),
        db=p.config.get("Redis_Level_DB_Sentiment", "db"))

    while True:
        message = p.get_from_set()
        if message is None:
            publisher.debug("{} queue is empty, waiting".format(config_section))
            time.sleep(1)
            continue

        Analyse(message, server)