# -*- coding: utf-8 -*-

from datetime import datetime
import csv
import sys
from miscellaneous import *
from datetime import datetime
import time
import textacy
from scipy import *

import os

csv.field_size_limit(sys.maxsize)
FILEPATH = os.path.dirname(os.path.realpath(__file__)) + "/"



# load config
config_ini = FILEPATH + "config.ini"

config = ConfigParser.ConfigParser()
with open(config_ini) as f:
    config.read_file(f)


global REGEX_SPECIALCHAR

global WORDS


REGEX_SPECIALCHAR = r'[`\=~%^&*()_+\[\]{};\'"|</>]' #+r',.-\\:' #+r',.?!'

WORDS= {}


##########################    Spellchecking        ##########################################
# http://norvig.com/spell-correct.html
# http://wortschatz.uni-leipzig.de/en/download

import re


def words(text): return re.findall(r'\w+', text.lower())

def P(word, N=sum(WORDS.values())):
    "Probability of `word`."
    return WORDS[word] / N


def correction(word):
    "Most probable spelling correction for word."
    return max(candidates(word), key=P)


def candidates(word):
    "Generate possible spelling corrections for word."
    return (known([word]) or known(edits1(word)) or known(edits2(word)) or [word])


def known(words):
    "The subset of `words` that appear in the dictionary of WORDS."
    return set(w for w in words if w in WORDS)


def edits1(word):
    "All edits that are one edit away from `word`."
    letters = 'abcdefghijklmnopqrstuvwxyz'
    splits = [(word[:i], word[i:]) for i in range(len(word) + 1)]
    deletes = [L + R[1:] for L, R in splits if R]
    transposes = [L + R[1] + R[0] + R[2:] for L, R in splits if len(R) > 1]
    replaces = [L + c + R[1:] for L, R in splits if R for c in letters]
    inserts = [L + c + R for L, R in splits for c in letters]
    return set(deletes + transposes + replaces + inserts)


def edits2(word):
    "All edits that are two edits away from `word`."
    return (e2 for e1 in edits1(word) for e2 in edits1(e1))


def autocorrectWord(word):
    try:
        return correction(word)
    except:
        return word


############# stringcleaning





def clean(stringstream,autocorrect=False):

    for string in stringstream:
        # fixUnicode
        string = textacy.preprocess.fix_bad_unicode(string.lower(), normalization=u'NFC')

        # seperate_words_on_regex:
        string = " ".join(re.compile(REGEX_SPECIALCHAR).split(string))

        #normalize whitespace
        string = textacy.preprocess.normalize_whitespace(string)

        #remove linebreaks
        string = re.sub(r'[\n]', " ", string)

        # replaceRockDots
        string = re.sub(r'[ß]', "ss", string)
        string = re.sub(r'[ö]', "oe", string)
        string = re.sub(r'[ü]', "ue", string)
        string = re.sub(r'[ä]', "ae", string)

        # frage autocorrect?
        #idee http://lexitron.nectec.or.th/public/COLING-2010_Beijing_China/POSTERS/pdf/POSTERS022.pdf
        if autocorrect:
            string = " ".join([autocorrectWord(word) for word in string.split()])

        yield string



def processDictstream(dictstream, funcdict, parser):
    """

    :param dictstream: dict-gen
    :param funcdict:
                    clean_in_meta = {
                        "Solution":funclist,
                        ...
                    }

    :param parser: spacy-parser
    :return: dict-gen
    """
    for dic in dictstream:
        result = {}
        for key, value in dic.items():

            if key in funcdict:

                doc = parser(value)
                tokens = [tok for tok in doc]
                funclist = funcdict[key]

                tokens = filterTokens(tokens, funclist)

                result[key] = " ".join([tok.lower_ for tok in tokens])


            else:
                result[key] = value
        yield result

def filterTokens(tokens, funclist):
    # in:tokenlist, funclist
    # out: tokenlist
    for f in funclist:
        tokens = list(filter(f, tokens))

    return tokens

def removePOS(pos_list):
    return lambda tok: tok.pos_ not in pos_list

##################################################################################################


path2wordsdict = FILEPATH + config.get("spellchecking", "pickle_file")

corpus_de_path = FILEPATH + config.get("de_corpus", "path")

corpus_en_path = FILEPATH + config.get("en_corpus", "path")




def cleanCorpus(corpus_path, filter_tokens, clean_in_meta, lang="de", printrandom=10):

    logprint("Clean {0}_corpus at {1}".format(lang, datetime.now()))

    rawCorpus_name = lang + "_raw_ticket"
    cleanCorpus_name = lang + "_clean_ticket"

    #load raw corpus and create new one
    raw_corpus, parser = load_corpus(corpus_name=rawCorpus_name, corpus_path=corpus_path)

    clean_corpus = textacy.Corpus(parser)


    ## process and add files to textacy-corpi,
    clean_corpus.add_texts(
        clean(corpus2Text(raw_corpus)),
        processDictstream(corpus2Meta(raw_corpus), clean_in_meta,parser=parser)
    )


    # leere docs aus corpi kicken
    clean_corpus.remove(lambda doc: len(doc) == 0)


    for i in range(printrandom):
        printRandomDoc(clean_corpus)



    #save corpus
    save_corpus(corpus=clean_corpus, corpus_path=corpus_path, corpus_name=cleanCorpus_name)



    return clean_corpus



def main():
    start = time.time()

    WORDS = load_obj(path2wordsdict)

    clean_in_content = [] #frage notwendig?


    clean_in_meta = {
        "Solution": [removePOS(["SPACE"])],
        "Subject": [removePOS(["SPACE", "PUNCT"])],
        "categoryName": [removePOS(["SPACE", "PUNCT"])]
    }

    corpus = cleanCorpus(corpus_de_path,  clean_in_content, clean_in_meta, "de",printrandom=5 )

    end = time.time()
    logprint("Time Elapsed Cleaning:{0} min".format((end - start) / 60))

if __name__ == "__main__":
    main()