#!/usr/bin/python

import logging
import datetime
import re
import urllib
import requests_cache
from bs4 import BeautifulSoup
from . import register, Site, Section, Chapter

logger = logging.getLogger(__name__)


@register
class ArchiveOfOurOwn(Site):
    """Archive of Our Own: it has its own epub export, but the formatting is awful"""
    @staticmethod
    def matches(url):
        # e.g. http://archiveofourown.org/works/5683105/chapters/13092007
        match = re.match(r'^(https?://archiveofourown\.org/works/\d+)/?.*', url)
        if match:
            return match.group(1) + '/'

    def login(self, login_details):
        with requests_cache.disabled():
            login = self.session.get('https://archiveofourown.org/users/login')
            soup = BeautifulSoup(login.text, 'html5lib')
            form = soup.find(id='new_user')
            post = {
                'user[login]': login_details[0],
                'user[password]': login_details[1],
                # standard fields:
                'user[remember_me]': '1',
                'utf8': form.find(attrs={'name': 'utf8'})['value'],
                'authenticity_token': form.find(attrs={'name': 'authenticity_token'})['value'],
                'commit': 'Log In',
            }
            # I feel the session *should* handle this cookies bit for me. But
            # it doesn't. And I don't know why.
            self.session.post(
                urllib.parse.urljoin(login.url, str(form.get('action'))),
                data=post, cookies=login.cookies
            )
            logger.info("Logged in as %s", login_details[0])

    def extract(self, url):
        workid = re.match(r'^https?://archiveofourown\.org/works/(\d+)/?.*', url).group(1)
        return self._extract_work(workid)

    def _extract_work(self, workid):
        nav_url = 'http://archiveofourown.org/works/{}/navigate?view_adult=true'.format(workid)
        soup = self._soup(nav_url)

        metadata = soup.select('#main h2.heading a')
        story = Section(
            title=metadata[0].text.strip(),
            author=metadata[1].text.strip(),
            url='http://archiveofourown.org/works/{}'.format(workid)
        )

        for chapter in soup.select('#main ol[role="navigation"] li'):
            link = chapter.find('a')
            chapter_url = urllib.parse.urljoin(nav_url, str(link.get('href')))
            chapter_url += '?view_adult=true'

            updated = datetime.datetime.strptime(
                chapter.find('span', class_='datetime').string,
                "(%Y-%m-%d)"
            )

            story.add(Chapter(title=link.string, contents=self._chapter(chapter_url), date=updated))

        return story

    def _chapter(self, url):
        logger.info("Extracting chapter @ %s", url)
        soup = self._soup(url)
        content = soup.find('div', role='article')

        for landmark in content.find_all(class_='landmark'):
            landmark.decompose()

        # TODO: Maybe these should be footnotes instead?
        notes = soup.select('#chapters .end.notes')
        if notes:
            notes = notes[0]
            for landmark in notes.find_all(class_='landmark'):
                landmark.decompose()

        return content.prettify() + (notes and notes.prettify() or '')


@register
class ArchiveOfOurOwnSeries(ArchiveOfOurOwn):
    _key = "ArchiveOfOurOwn"

    @staticmethod
    def matches(url):
        # e.g. http://archiveofourown.org/series/5683105/
        match = re.match(r'^(https?://archiveofourown\.org/series/\d+)/?.*', url)
        if match:
            return match.group(1) + '/'

    def extract(self, url):
        seriesid = re.match(r'^https?://archiveofourown\.org/series/(\d+)/?.*', url).group(1)

        soup = self._soup('http://archiveofourown.org/series/{}?view_adult=true'.format(seriesid))

        story = Section(
            title=soup.select('#main h2.heading')[0].text.strip(),
            author=soup.select('#main dl.series.meta a[rel="author"]')[0].string,
            url='http://archiveofourown.org/series/{}'.format(seriesid)
        )

        for work in soup.select('#main ul.series li.work'):
            workid = work.get('id').replace('work_', '')
            substory = self._extract_work(workid)

            # TODO: improve epub-writer to be able to generate a toc.ncx with nested headings
            story.add(substory)

        return story