#!/usr/bin/env python
# -*- coding: utf-8 -*-
from __future__ import unicode_literals

import os

import markdown.inlinepatterns
import markdown.extensions
import markdown.util
import macros.plugin

import slugify as slugify_impl

class ClickHouseLinkMixin(object):

    def handleMatch(self, m, data):
        single_page = (os.environ.get('SINGLE_PAGE') == '1')
        try:
            el, start, end = super(ClickHouseLinkMixin, self).handleMatch(m, data)
        except IndexError:
            return

        if el is not None:
            href = el.get('href') or ''
            is_external = href.startswith('http:') or href.startswith('https:')
            if is_external:
                if not href.startswith('https://clickhouse.tech'):
                    el.set('rel', 'external nofollow noreferrer')
            elif single_page:
                if '#' in href:
                    el.set('href', '#' + href.split('#', 1)[1])
                else:
                    el.set('href', '#' + href.replace('/index.md', '/').replace('.md', '/'))
        return el, start, end


class ClickHouseAutolinkPattern(ClickHouseLinkMixin, markdown.inlinepatterns.AutolinkInlineProcessor):
    pass


class ClickHouseLinkPattern(ClickHouseLinkMixin, markdown.inlinepatterns.LinkInlineProcessor):
    pass


class ClickHousePreprocessor(markdown.util.Processor):
    def run(self, lines):
        if os.getenv('QLOUD_TOKEN'):
            for line in lines:
                if '<!--hide-->' not in line:
                    yield line
        else:
            for line in lines:
                yield line


class ClickHouseMarkdown(markdown.extensions.Extension):

    def extendMarkdown(self, md, md_globals):
        md.preprocessors['clickhouse'] = ClickHousePreprocessor()
        md.inlinePatterns['link'] = ClickHouseLinkPattern(markdown.inlinepatterns.LINK_RE, md)
        md.inlinePatterns['autolink'] = ClickHouseAutolinkPattern(markdown.inlinepatterns.AUTOLINK_RE, md)


def makeExtension(**kwargs):
    return ClickHouseMarkdown(**kwargs)


def slugify(value, separator):
    return slugify_impl.slugify(value, separator=separator, word_boundary=True, save_order=True)


def get_translations(dirname, lang):
    import babel.support
    return babel.support.Translations.load(
        dirname=dirname,
        locales=[lang, 'en']
    )


class PatchedMacrosPlugin(macros.plugin.MacrosPlugin):
    disabled = False

    def on_config(self, config):
        super(PatchedMacrosPlugin, self).on_config(config)
        self.env.comment_start_string = '{##'
        self.env.comment_end_string = '##}'

    def on_env(self, env, config, files):
        env.add_extension('jinja2.ext.i18n')
        dirname = os.path.join(config.data['theme'].dirs[0], 'locale')
        lang = config.data['theme']['language']
        env.install_gettext_translations(
            get_translations(dirname, lang),
            newstyle=True
        )
        chunk_size = 10240
        env.filters['chunks'] = lambda line: [line[i:i+chunk_size] for i in range(0, len(line), chunk_size)]
        return env

    def render(self, markdown):
        if not self.disabled:
            return self.render_impl(markdown)
        else:
            return markdown

    def render_impl(self, markdown):
        md_template = self.env.from_string(markdown)
        return md_template.render(**self.variables)


macros.plugin.MacrosPlugin = PatchedMacrosPlugin