from sqlalchemy import Column, Integer, ForeignKey, String, Text, DateTime
from datetime import datetime
from time import mktime
import urllib2
from readability.readability import Document
import html2text
import HTMLParser

from models import Base

def fetch_readability(link):
    h2t = html2text.HTML2Text()
    h2t.body_width = 0
    h2t.inline_links = False
    h2t.ignore_links = True
    h2t.ignore_images = True
    response = urllib2.urlopen(link)
    text = response.read()
    text = Document(text).summary()
    text = h2t.handle(text)
    return text

def fetch_full_page(link):
    response = urllib2.urlopen(link)
    html = response.read()
    html = html.decode('utf8')
    return html

def size_human_readable(bytesize):
    for x in ['bytes','KB','MB','GB']:
        if bytesize < 1024.0:
            return "%3.1f%s" % (bytesize, x)
        bytesize /= 1024.0
    return "%3.1f%s" % (bytesize, 'TB')

class Entry(Base):
    __tablename__ = 'entry'

    id = Column(Integer, primary_key=True)
    feed_id = Column(Integer, ForeignKey('feed.id'))
    title = Column(String(255))
    link = Column(String(255))
    summary = Column(Text)
    content = Column(Text)
    author = Column(String(255))
    enclosures = Column(Text)

    resolvedlink = Column(String(255))
    fullpage = Column(Text)
    readability = Column(Text)
    updated = Column(DateTime)
    firstfetched = Column(DateTime)
    lastfetched = Column(DateTime)
    sent = Column(DateTime)

    def __init__(self, entry, feed):
        if entry.has_key('title'):
            self.title = entry.get('title')
        if entry.has_key('link'):
            self.link = entry.get('link')
        if entry.has_key('summary'):
            self.summary = entry.get('summary')
        if entry.has_key('content'):
            self.content = entry.get('content')[0].value
        if entry.has_key('author'):
            self.author = entry.get('author')
        if entry.has_key('updated_parsed'):
            updated_parsed = entry.get('updated_parsed')
            self.updated = datetime.fromtimestamp(mktime(updated_parsed))
        if entry.has_key('enclosures') and len(entry.get('enclosures')) > 0:
            enclosures = ''
            for enclosure in entry.get('enclosures'):
                if not enclosures == '':
                    enclosures += '\n'
                enclosures += enclosure['href']
                if enclosure.has_key('length'):
                    enclosures += ' (%s)' % size_human_readable(int(enclosure['length']))
            self.enclosures = enclosures
        if feed.resolveredirects:
            print '    fetching final link <%s>' % entry.link
            request = urllib2.Request(entry.link)
            opener = urllib2.build_opener()
            try:
                result = opener.open(request)
                self.resolvedlink = result.url
                print '    final link: <%s>' % result.url
            except:
                print '    FAILED opening URL'
        if feed.fullpage:
            print '    fetching full page <%s>' % entry.link
            self.fullpage = fetch_full_page(entry.link)
        if feed.readability:
            print '    fetching readability <%s>' % entry.link
            self.readability = fetch_readability(entry.link)
        if feed.html2textcontent:
            print '    converting summary'
            h2t = html2text.HTML2Text()
            h2t.body_width = 0
            h2t.inline_links = False
            if feed.html2textignorelinks:
                h2t.ignore_links = True
            if feed.html2textignoreimages:
                h2t.ignore_images = True
            if feed.contentcolumn == 'summary' and self.summary:
                self.summary = h2t.handle(self.summary)
            elif feed.contentcolumn == 'content' and self.content:
                self.content = h2t.handle(self.content)
            elif feed.contentcolumn == 'fullpage' and self.fullpage:
                self.fullpage = h2t.handle(self.fullpage)
            elif feed.contentcolumn == 'readability' and self.readability:
                self.readability = h2t.handle(self.readability)
        hp = HTMLParser.HTMLParser()
        if self.summary:
            self.summary = hp.unescape(self.summary)
        if self.content:
            self.content = hp.unescape(self.content)
        if self.fullpage:
            self.fullpage = hp.unescape(self.fullpage)
        if self.readability:
            self.readability = hp.unescape(self.readability)
        self.firstfetched = datetime.now()
        self.lastfetched = datetime.now()

    def __unicode__(self):
        return u'%d -> %s' % (self.id, self.title)

    def __str__(self):
        return unicode(self).encode('utf-8')

    def __repr__(self):
       return "<Entry('%d','%s')>" % (self.id, self.title)

    def get_text(self):
        text = ''
        if self.feed.contentcolumn == 'summary' and self.summary:
            text = self.summary
        elif self.feed.contentcolumn == 'content' and self.content:
            text = self.content
        elif self.feed.contentcolumn == 'fullpage' and self.fullpage:
            text = self.fullpage
        elif self.feed.contentcolumn == 'readability' and self.readability:
            text = self.readability
        if self.enclosures:
            text += '\n\nEnclosures:\n%s' % self.enclosures
        return text

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