#!/usr/bin/env python
#coding: utf-8

from sqlalchemy import Column, Integer, ForeignKey, String, Text, DateTime
from datetime import datetime
from time import mktime
import urllib2
#import urllib
#import hn
import html2text
import HTMLParser

from models import Base

def fetch_readability(link):
    text = hn.upgradeLink(link)
    text = text.decode('utf8')
    return text

def fetch_full_page(link):
    opener = urllib.FancyURLopener({})
    response = opener.open(link)
    html = response.read()
    html = html.decode('utf8')
    text = html2text.html2text(html)
    return text.encode('latin-1', 'replace')

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