import re
import htmlmin
import datetime
import html

from functions import sanitizeUrl
from newspaper import Article, Config


class News():
    r = re.compile(r"hours? ago|yesterday|today|last week|month",
                   flags=re.IGNORECASE)
    r_noise = re.compile(r"posted|Product|Google", flags=re.IGNORECASE)

    URL = ""
    LOWERURL = ""
    AUTHORS = []
    SCRAP_DATE = None
    PUBLISH_DATE = None
    SUMMARY = ""
    TEXT = ""
    HTML = ""
    ERROR = False
    SOURCE = ""
    SOURCENAME = ""
    WEIGHT_SUM = 0
    MATCHES = False
    MATCHING_KW = []
    TITLE = ""
    CATEGORY = 0

    def __init__(self, url, sourceid, sourcename, sourcecategory, kw, lang="en", html=None):
        url = sanitizeUrl(url)
        self.URL = url
        self.LOWERURL = url.lower()
        self.SOURCENAME = sourcename
        self.SOURCE = sourceid
        self.CATEGORY = sourcecategory
        self.MATCHING_KW = []

        config = Config()
        config.language = lang
        config.memoize_articles = False
        config.keep_article_html = True
        config.request_timeout = 15
        config.fetch_images = False
        config.browser_user_agent = "Mozilla/5.0 (X11; Linux x86_64; rv:47.0) Gecko/20100101 Firefox/47.0"

        a = None
        try:
            a = Article(url=url, config=config)
            if html is not None:
                a.download(html=html)
            else:
                a.download()

            a.parse()
            a.nlp()
        except Exception as e:
            print("ERROR parsing/downloading/nlp article")
            print(e)
            print(url)
            print(sourcename)
            if html is not None:
                print(len(html))
            self.ERROR = True
            self.MATCHES = False
            return

        a.authors = self.dedup([self.fix_author(
            value) for value in a.authors if not self.isComment(value) and not self.isNoise(value)])

        self.SCRAP_DATE = datetime.datetime.now()
        self.AUTHORS = a.authors
        self.PUBLISH_DATE = a.publish_date
        self.SUMMARY = a.summary
        self.TEXT = a.text
        self.TITLE = self.fix_title(a.title)
        self.HTML = htmlmin.minify(a.article_html, remove_empty_space=True)
#        if html is None:
#            self.HTML=htmlmin.minify(a.article_html,remove_empty_space=True)
#        else:
#            self.HTML=htmlmin.minify(html,remove_empty_space=True)
        self.ERROR = False
        lowertext = self.TEXT.lower()
        ret = match_keywords(kw, lowertext)
        self.MATCHES = ret["matches"]
        self.WEIGHT_SUM = ret["weight"]
        self.MATCHING_KW = ret["kw"]

    def get(self):
        return {
            "url": self.URL,
            "lowerurl": self.LOWERURL,
            "source": self.SOURCE,
            "source_name": self.SOURCENAME,
            "authors": self.AUTHORS,
            "scrap_date": self.SCRAP_DATE,
            "publish_date": self.PUBLISH_DATE,
            "summary": self.SUMMARY,
            "text": self.TEXT,
            "matches": self.MATCHES,
            "weight": self.WEIGHT_SUM,
            "kw": self.MATCHING_KW,
            "html": self.HTML,
            "error": self.ERROR,
            "deleted": False,
            "category": self.CATEGORY,
            "title": self.TITLE
        }

    def fix_title(self, n):
        while(html.unescape(n) != n):
            n = html.unescape(n)
        n = n.replace("&Dquot", '"')
        return n

    def dedup(self, val):
        return list(set(val))

    def isNoise(self, v):
        if self.r_noise.match(v):
            return True
        return False

    def isComment(self, v):
        if self.r.match(v):
            return True
        return False

    def fix_author(self, a):
        return a.replace("_", " ").lower()


def match_keywords(keywords, lowertext):
    w_sum = 0
    matching = []
    matches = False
    for k in keywords:
        num_matches = len([1 for kwp in k["pattern"] if kwp.search(lowertext)])
        if num_matches == len(k["pattern"]):
            w_sum += k["weight"]
            matching.append(k["kw"])
            matches = True

    ret = ({"matches": matches, "weight": w_sum, "kw": matching})
    return ret