# Copyright (c) 2012 Roberto Alsina y otros.

# Permission is hereby granted, free of charge, to any
# person obtaining a copy of this software and associated
# documentation files (the "Software"), to deal in the
# Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the
# Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice
# shall be included in all copies or substantial portions of
# the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
# PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
# OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
# OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

"""Implementation of compile_html based on markdown."""

import codecs
import os
import re

try:
    from markdown import markdown
except ImportError:
    markdown = None  # NOQA

from nikola.plugin_categories import PageCompiler


class CompileMarkdown(PageCompiler):
    """Compile markdown into HTML."""

    name = "markdown"

    def compile_html(self, source, dest):
        if markdown is None:
            raise Exception('To build this site, you need to install the '
                            '"markdown" package.')
        try:
            os.makedirs(os.path.dirname(dest))
        except:
            pass
        with codecs.open(dest, "w+", "utf8") as out_file:
            with codecs.open(source, "r", "utf8") as in_file:
                data = in_file.read()
            output = markdown(data, ['fenced_code', 'codehilite'])
            # h1 is reserved for the title so increment all header levels
            for n in reversed(range(1, 9)):
                output = re.sub('<h%i>' % n, '<h%i>' % (n + 1), output)
                output = re.sub('</h%i>' % n, '</h%i>' % (n + 1), output)
            # python-markdown's highlighter uses the class 'codehilite' to wrap
            # code, # instead of the standard 'code'. None of the standard
            # pygments stylesheets use this class, so swap it to be 'code'
            output = re.sub(r'(<div[^>]+class="[^"]*)codehilite([^>]+)',
                            r'\1code\2', output)
            out_file.write(output)

    def create_post(self, path, onefile=False, title="", slug="", date="",
                    tags=""):
        with codecs.open(path, "wb+", "utf8") as fd:
            if onefile:
                fd.write('<!-- \n')
                fd.write('.. title: %s\n' % title)
                fd.write('.. slug: %s\n' % slug)
                fd.write('.. date: %s\n' % date)
                fd.write('.. tags: %s\n' % tags)
                fd.write('.. link: \n')
                fd.write('.. description: \n')
                fd.write('-->\n\n')
            fd.write("\nWrite your post here.")