import email.utils
import os.path
import time

plugins_release = '1.5'
mib_release = '1.0.1'
release_notes = 'news/release-%s.html' % plugins_release.replace('.', '-')
site_url = 'https://www.nagios-plugins.org/'
feeds = """These project news articles are also available as an
[RSS feed][rss]{: rel="alternate" type="application/rss+xml" }.  Additional
stuff is posted to [Twitter][twitter], so you might want to [follow us][follow]
there as well.

[rss]: rss.xml "RSS Feed"
[twitter]: https://twitter.com/ "Twitter"
[follow]: https://twitter.com/intent/follow?screen_name=monitorplugins "Follow Us"
"""

page = {
    "description": "Standard monitoring plugins for Nagios and compatible monitoring solutions.",
    "keywords": "Nagios, Icinga, Shinken, Monitoring, Official, Plugins, Open, Source, Free, Software"
}

#
# RSS Feed
#

_RSS = """<?xml version="1.0" encoding="UTF-8"?>
<rss version="2.0">
  <channel>
    <title>%s</title>
    <link>%s</link>
    <description>%s</description>
    <language>en-us</language>
    <webMaster>webmaster@nagios-plugins.org</webMaster>
    <pubDate>%s</pubDate>
    <lastBuildDate>%s</lastBuildDate>
    <generator>Poole</generator>
    <docs>http://blogs.law.harvard.edu/tech/rss</docs>
    %s
  </channel>
</rss>
"""

_RSS_ITEM = """
    <item>
      <title>%s</title>
      <link>%s</link>
      <description>%s</description>
      <guid>%s</guid>
      <pubDate>%s</pubDate>
    </item>
"""

def hook_postconvert_rss():
    items = []
    posts = [p for p in pages if 'date' in p]
    posts.sort(key=lambda p: p.date, reverse=True)
    for p in posts:
        link = '%s/%s' % (site_url.rstrip('/'), p.url)
        desc = hx(p.html)
        date = time.mktime(time.strptime('%s 12' % p.date, '%Y-%m-%d %H'))
        date = email.utils.formatdate(date)
        items.append(_RSS_ITEM % (p.title, link, desc, link, date))
    items = ''.join(items)
    title = 'Nagios Plugins'
    link = '%s/news/' % site_url.rstrip('/')
    desc = 'Announcements published by the Nagios Plugins Development Team.'
    date = email.utils.formatdate()
    rss = _RSS % (title, link, desc, date, date, items)
    fp = open(os.path.join(output, 'rss.xml'), 'w')
    fp.write(rss)
    fp.close()

#
# News
#

def hook_preconvert_news():
    posts_per_page = 10
    posts = [p for p in pages if 'date' in p]
    posts.sort(key=lambda p: p.date, reverse=True)
    n_news_pages = len(posts) / posts_per_page
    if len(posts) % posts_per_page > 0:
        n_news_pages += 1
    for i, chunk in enumerate(next_news_chunk(posts, posts_per_page)):
        content = make_news_page(chunk, i) + make_news_footer(n_news_pages, i)
        if i == 0:
            p = Page('news/index.md',
                     virtual=content,
                     menu=2,
                     title='News',
                     parent='Home')
        else:
            p = Page('news/%d.md' % (i + 1),
                     virtual=content,
                     title='News Page %d' % (i + 1),
                     parent='News')
        pages.append(p)

def make_news_page(posts, current_index):
    marker = '<end-of-teaser>'
    if current_index == 0:
        title = 'News'
        teaser = ['# ' + title, feeds]
    else:
        title = 'News Page %d' % (current_index + 1)
        teaser = ['# ' + title]
    for p in posts:
        source = list()
        author = p.author.encode('ascii', 'xmlcharrefreplace')
        timestamp = time.strptime(p.date, '%Y-%m-%d')
        author_date = author + ', ' + time.strftime('%B %-e, %Y', timestamp)
        teaser.append('## %s' % p.title)
        teaser.append('*%s*' % author_date)
        teaser.append('%s' % p.source.split(marker, 1)[0].rstrip())
        teaser.append('<a href="%s">Read&nbsp;more&nbsp;&raquo;</a>' % p.url)
        source.append('# %s' % p.title)
        source.append('*%s*' % author_date)
        source.append(p.source.replace(marker, '', 1))
        p.source = '\n'.join(source)
        p['parent'] = title
    return '\n'.join(teaser) + '\n\n'

def make_news_footer(n_news_pages, current_index):
    if n_news_pages == 1:
        return ''
    footer = list()
    if current_index != 0:
        previous = 'index' if current_index == 1 else str(current_index)
        footer.append('[First](news/index.html)')
        footer.append('[Previous](news/%s.html)' % previous)
    if n_news_pages <= 20:
        for i in range(n_news_pages):
            if i == current_index:
                footer.append('%d' % (i + 1))
            else:
                footer.append('[%d](news/%d.html)' % (i + 1, i + 1))
    if current_index != n_news_pages - 1:
        footer.append('[Next](news/%d.html)' % (current_index + 2))
        footer.append('[Last](news/%d.html)' % n_news_pages)
    return '&emsp;'.join(footer) + '\n{: #news-footer }\n'

def next_news_chunk(posts, posts_per_page):
    index = 0
    while len(posts[index:]) > 0:
        yield posts[index:index + posts_per_page]
        index += posts_per_page

#
# Menu and Breadcrumb Navigation
#

def menu():
    menu_pages = [p for p in pages if 'menu' in p]
    menu_pages.sort(key=lambda p: int(p['menu']))
    for p in menu_pages:
        if p.title == page.title:
            print('<span id="current">%s</span>' % hx(p.title))
        else:
            print('<span><a href="%s">%s</a></span>' % (p.url, hx(p.title)))

def breadcrumb():
    stable = '<span id="release">Stable release: <a href="%s">%s</a></span>' \
           % (release_notes, plugins_release)
    parents = {p.title: (p.url, p.get('parent')) for p in pages}
    title = page.title
    crumbs = hx(title)
    while parents[title][1] is not None:
        title = parents[title][1]
        url = parents[title][0]
        crumbs = '<a href="%s">%s</a> &raquo; %s' % (url, hx(title), crumbs)
    if crumbs == hx(page.title):
        crumbs = '&nbsp;' + stable
    return crumbs

#
# Miscellaneous
#

def list_kids():
    kids = [(p.url, p.title) for p in pages if p.get('parent') == page.title]
    for kid in sorted(kids):
        print('* [%s](%s)' % (kid[1], kid[0]))

def copyright_years(since=None):
    this_year = time.gmtime().tm_year
    if since is not None and int(since) != this_year:
        return str(since) + '&ndash;' + str(this_year)
    else:
        return str(this_year)

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