#!/usr/bin/env  python2
# License: GPLv3 Copyright: 2008, Kovid Goyal <kovid at kovidgoyal.net>

try:
    from http.cookiejar import Cookie
except ImportError:
    from cookielib import Cookie
import json

from html5_parser import parse
from lxml import etree

from calibre import replace_entities
from calibre.ebooks.BeautifulSoup import NavigableString, Tag
from calibre.utils.cleantext import clean_ascii_chars
from calibre.web.feeds.news import BasicNewsRecipe


def E(parent, name, text='', **attrs):
    ans = parent.makeelement(name, **attrs)
    ans.text = text
    parent.append(ans)
    return ans


def process_node(node, html_parent):
    ntype = node.get('type')
    if ntype == 'tag':
        c = html_parent.makeelement(node['name'])
        c.attrib.update(node.get('attribs', {}))
        html_parent.append(c)
        for nc in node.get('children', ()):
            process_node(nc, c)
    elif ntype == 'text':
        text = node.get('data')
        if text:
            text = replace_entities(text)
            if len(html_parent):
                t = html_parent[-1]
                t.tail = (t.tail or '') + text
            else:
                html_parent.text = (html_parent.text or '') + text


def load_article_from_json(raw, root):
    data = json.loads(raw)['props']['pageProps']['content']
    # open('/t/raw.json', 'w').write(json.dumps(data, indent=2, sort_keys=True))
    body = root.xpath('//body')[0]
    for child in tuple(body):
        body.remove(child)
    article = E(body, 'article')
    E(article, 'h4', data['subheadline'], style='color: red; margin: 0')
    E(article, 'h1', data['headline'], style='font-size: x-large')
    E(article, 'div', data['description'], style='font-style: italic')
    E(article, 'div', (data['datePublishedString'] or '') + ' | ' + (data['dateline'] or ''), style='color: gray; margin: 1em')
    images = data['image']
    if 'main' in images:
        div = E(article, 'div')
        try:
            E(div, 'img', src=images['main']['url']['canonical'])
        except Exception:
            pass
    text = data['text']
    for node in text:
        process_node(node, article)


def classes(classes):
    q = frozenset(classes.split(' '))
    return dict(attrs={
        'class': lambda x: x and frozenset(x.split()).intersection(q)})


def new_tag(soup, name, attrs=()):
    impl = getattr(soup, 'new_tag', None)
    if impl is not None:
        return impl(name, attrs=dict(attrs))
    return Tag(soup, name, attrs=attrs or None)


class NoArticles(Exception):
    pass


def process_url(url):
    if url.startswith('/'):
        url = 'https://www.economist.com' + url
    return url


class Economist(BasicNewsRecipe):

    title = 'The Economist'
    language = 'en'

    __author__ = "Kovid Goyal"
    INDEX = 'https://www.economist.com/printedition'
    description = (
        'Global news and current affairs from a European'
        ' perspective. Best downloaded on Friday mornings (GMT)'
    )
    extra_css = '''
        .headline {font-size: x-large;}
        h2 { font-size: small;  }
        h1 { font-size: medium;  }
        em.Bold {font-weight:bold;font-style:normal;}
        em.Italic {font-style:italic;}
        p.xhead {font-weight:bold;}
        .pullquote {
            float: right;
            font-size: larger;
            font-weight: bold;
            font-style: italic;
            page-break-inside:avoid;
            border-bottom: 3px solid black;
            border-top: 3px solid black;
            width: 228px;
            margin: 0px 0px 10px 15px;
            padding: 7px 0px 9px;
        }
        .flytitle-and-title__flytitle {
            display: block;
            font-size: smaller;
            color: red;
        }
        '''
    oldest_article = 7.0
    resolve_internal_links = True
    remove_tags = [
        dict(name=['script', 'noscript', 'title', 'iframe', 'cf_floatingcontent', 'aside', 'footer']),
        dict(attrs={'aria-label': "Article Teaser"}),
        dict(attrs={
                'class': [
                    'dblClkTrk', 'ec-article-info', 'share_inline_header',
                    'related-items', 'main-content-container', 'ec-topic-widget',
                    'teaser', 'blog-post__bottom-panel-bottom', 'blog-post__comments-label',
                    'blog-post__foot-note', 'blog-post__sharebar', 'blog-post__bottom-panel',
                    'newsletter-form','share-links-header','teaser--wrapped', 'latest-updates-panel__container',
                    'latest-updates-panel__article-link','blog-post__section'
                ]
            }
        ),
        dict(attrs={
                'class': lambda x: x and 'blog-post__siblings-list-aside' in x.split()}),
        classes(
            'share-links-header teaser--wrapped latest-updates-panel__container'
            ' latest-updates-panel__article-link blog-post__section newsletter-form blog-post__bottom-panel'
        )
    ]
    keep_only_tags = [dict(name='article', id=lambda x: not x)]
    no_stylesheets = True
    remove_attributes = ['data-reactid', 'width', 'height']
    # economist.com has started throttling after about 60% of the total has
    # downloaded with connection reset by peer (104) errors.
    delay = 1

    needs_subscription = False

    def __init__(self, *args, **kwargs):
        BasicNewsRecipe.__init__(self, *args, **kwargs)
        if self.output_profile.short_name.startswith('kindle'):
            # Reduce image sizes to get file size below amazon's email
            # sending threshold
            self.web2disk_options.compress_news_images = True
            self.web2disk_options.compress_news_images_auto_size = 5
            self.log.warn('Kindle Output profile being used, reducing image quality to keep file size below amazon email threshold')

    def get_browser(self):
        br = BasicNewsRecipe.get_browser(self)
        # Add a cookie indicating we have accepted Economist's cookie
        # policy (needed when running from some European countries)
        ck = Cookie(
            version=0,
            name='notice_preferences',
            value='2:',
            port=None,
            port_specified=False,
            domain='.economist.com',
            domain_specified=False,
            domain_initial_dot=True,
            path='/',
            path_specified=False,
            secure=False,
            expires=None,
            discard=False,
            comment=None,
            comment_url=None,
            rest={'HttpOnly': None},
            rfc2109=False
        )
        br.cookiejar.set_cookie(ck)
        br.set_handle_gzip(True)
        return br

    def preprocess_raw_html(self, raw, url):
        # open('/t/raw.html', 'wb').write(raw.encode('utf-8'))
        root = parse(raw)
        script = root.xpath('//script[@id="__NEXT_DATA__"]')
        if script:
            load_article_from_json(script[0].text, root)
        for div in root.xpath('//div[@class="lazy-image"]'):
            noscript = list(div.iter('noscript'))
            if noscript and noscript[0].text:
                img = list(parse(noscript[0].text).iter('img'))
                if img:
                    p = noscript[0].getparent()
                    idx = p.index(noscript[0])
                    p.insert(idx, p.makeelement('img', src=img[0].get('src')))
                    p.remove(noscript[0])
        for x in root.xpath('//*[name()="script" or name()="style" or name()="source" or name()="meta"]'):
            x.getparent().remove(x)
        raw = etree.tostring(root, encoding='unicode')
        return raw

    def populate_article_metadata(self, article, soup, first):
        els = soup.findAll(name=['span', 'p'],
                           attrs={'class': ['flytitle-and-title__title', 'blog-post__rubric']})
        result = []
        for el in els[0:2]:
            if el is not None and el.contents:
                for descendant in el.contents:
                    if isinstance(descendant, NavigableString):
                        result.append(type(u'')(descendant))
        article.summary = u'. '.join(result) + u'.'
        article.text_summary = clean_ascii_chars(article.summary)

    def parse_index(self):
        # return [('Articles', [{'title':'test',
        #     'url':'file:///t/raw.html'
        # }])]
        raw = self.index_to_soup(self.INDEX, raw=True)
        # with open('/t/raw.html', 'wb') as f:
        #     f.write(raw)
        soup = self.index_to_soup(raw)
        # nav = soup.find(attrs={'class':'navigation__wrapper'})
        # if nav is not None:
        #     a = nav.find('a', href=lambda x: x and '/printedition/' in x)
        #     if a is not None:
        #         self.log('Following nav link to current edition', a['href'])
        #         soup = self.index_to_soup(process_url(a['href']))
        ans = self.economist_parse_index(soup)
        if not ans:
            raise NoArticles(
                'Could not find any articles, either the '
                'economist.com server is having trouble and you should '
                'try later or the website format has changed and the '
                'recipe needs to be updated.'
            )
        return ans

    def economist_parse_index(self, soup):
        div = soup.find(attrs={'class': 'weekly-edition-header__image'})
        if div is not None:
            img = div.find('img', srcset=True)
            self.cover_url = img['srcset'].split(',')[-1].split()[0]
            self.log('Got cover:', self.cover_url)

        feeds = []
        for section in soup.findAll(**classes('layout-weekly-edition-section')):
            h2 = section.find('h2')
            secname = self.tag_to_string(h2)
            self.log(secname)
            articles = []
            for a in section.findAll('a', href=True, **classes('headline-link weekly-edition-wtw__link')):
                spans = a.findAll('span')
                if len(spans) == 2:
                    title = u'{}: {}'.format(*map(self.tag_to_string, spans))
                else:
                    title = self.tag_to_string(a)
                articles.append({'title': title, 'url': process_url(a['href'])})
                self.log(' ', title, articles[-1]['url'])
            if articles:
                feeds.append((secname, articles))
        return feeds

    def eco_find_image_tables(self, soup):
        for x in soup.findAll('table', align=['right', 'center']):
            if len(x.findAll('font')) in (1, 2) and len(x.findAll('img')) == 1:
                yield x

    def postprocess_html(self, soup, first):
        for img in soup.findAll('img', srcset=True):
            del img['srcset']
        for table in list(self.eco_find_image_tables(soup)):
            caption = table.find('font')
            img = table.find('img')
            div = new_tag(soup, 'div')
            div['style'] = 'text-align:left;font-size:70%'
            ns = NavigableString(self.tag_to_string(caption))
            div.insert(0, ns)
            div.insert(1, new_tag(soup, 'br'))
            del img['width']
            del img['height']
            img.extract()
            div.insert(2, img)
            table.replaceWith(div)
        return soup

    def canonicalize_internal_url(self, url, is_link=True):
        if url.endswith('/print'):
            url = url.rpartition('/')[0]
        return BasicNewsRecipe.canonicalize_internal_url(self, url, is_link=is_link)