import nltk
from sumy.parsers.plaintext import PlaintextParser
from sumy.summarizers.luhn import LuhnSummarizer
from sumy.nlp.tokenizers import Tokenizer

nltk.download('punkt')

def summarize(file, SENTENCES_COUNT):

    sumarizer = LuhnSummarizer()
    with open(file.name) as f:
      doc = f.read()

    sentences_ = []
    doc_ = PlaintextParser(doc, Tokenizer("en")).document
    for sentence in sumarizer(doc_, SENTENCES_COUNT):
        sentences_.append(str(sentence))

    summm_ = " ".join(sentences_)
    
    return summm_