import re
import os
from bs4 import BeautifulSoup
from striprtf.striprtf import rtf_to_text
import json
import nltk as nltk


def php_cleaner(text):
    return re.findall(r"(?<=<\?php\\n\\n\/\*\*\\n \*).*(?=\\n \*\/)", text)[0]
def html_cleaner(text):
    soup = BeautifulSoup(text)
    return soup.body.text
def json_cleaner(text):
    out = "" 
    for keys in text:
        if keys in ('description', 'license'):
            out+=keys
            out+=": "
            out+=str(text[keys])
            out+=", "
    return out
def gnu_cleaner(text):
    t = text.split('END OF TERMS AND CONDITIONS')[0]
    if 'Preamble' in text:
        if len(t.split('Preamble')[0])>100:
            t0 = t.split('Preamble')[0]
            try:
                t1 = t.split('Preamble')[1].split('distribution and\nmodification follow')[1]
            except:
                try:
                    t1 = t.split('Preamble')[1].split('distribution and\n\nmodification follow')[1]
                except:
                    t1 = t.split('Preamble')[1].split('distribution and modification follow')[1]
            return t0+t1
        else: 
            return t.split('Preamble')[1].split('distribution and\nmodification follow')[1]
    else:
        return t
def rtf_cleaner(text):
    return rtf_to_text(text)
def character_cleaner(text):
    return re.sub("[=*-/·\n]+", "", text)
def url_cleaner(text):
    return re.sub(r'http\S+', '', text)
def isEnglish(s):
    try:
        s.encode(encoding='utf-8').decode('ascii')
    except UnicodeDecodeError:
        return False
    else:
        return True
    
# input as a text
def clean_license_text(text):
    text = text.strip()
    if text[:5] == '<?php':
        try:
            t = php_cleaner(text)
        except:
            return ""
    elif "</html>" in text:
        t = html_cleaner(text)
    elif text[0] == '{' and text[-1] == '}':
        with open(file, 'r') as f:
            t = json_cleaner(json.load(f))
    elif "GNU" in text or "Apache" in text:
        t = gnu_cleaner(text)
    elif "\\rtf" in text:
        t = rtf_cleaner(text)
    else:
        t = text

    t = url_cleaner(t)
    t = character_cleaner(t)

    if not isEnglish(t):
        if not isEnglish(' '.join(t.split()[-5:-1])):
            return ""
    return t