# -*- coding: utf-8 -*-

"""

 (c) 2014 - Copyright Red Hat Inc

 Authors:

   Ralph Bean <rbean@redhat.com></rbean@redhat.com>

   Pierre-Yves Chibon <pingou@pingoured.fr></pingou@pingoured.fr>

"""

import docutils

import docutils.core

import markupsafe

import markdown

def modify_rst(rst):

    """ Downgrade some of our rst directives if docutils is too old. """

    # We catch Exception if we want :-p

    # pylint: disable=W0703

    try:

        # The rst features we need were introduced in this version

        minimum = [0, 9]

        version = [int(cpt) for cpt in docutils.__version__.split('.')]

        # If we're at or later than that version, no need to downgrade

        if version >= minimum:

            return rst

    except Exception:  # pragma: no cover

        # If there was some error parsing or comparing versions, run the

        # substitutions just to be safe.

        pass

    # On Fedora this will never work as the docutils version is to recent

    # Otherwise, make code-blocks into just literal blocks.

    substitutions = {  # pragma: no cover

        '.. code-block:: javascript': '::',

    }

    for old, new in substitutions.items():  # pragma: no cover

        rst = rst.replace(old, new)

    return rst  # pragma: no cover

def modify_html(html):

    """ Perform style substitutions where docutils doesn't do what we want.

    """

    substitutions = {

        '<tt class="docutils literal">': '',</tt>

        '': '',

    }

    for old, new in substitutions.items():

        html = html.replace(old, new)

    return html

def convert_doc(rst_string):

    """ Utility to load an RST file and turn it into fancy HTML. """

    rst = modify_rst(rst_string)

    overrides = {'report_level': 'quiet'}

    html = docutils.core.publish_parts(

        source=rst,

        writer_name='html',

        settings_overrides=overrides)

    html_string = html['html_body']

    html_string = modify_html(html_string)

    html_string = markupsafe.Markup(html_string)

    return html_string

def convert_readme(content, ext):

    ''' Convert the provided content according to the extension of the file

    provided.

    '''

    output = content

    if ext and ext in ['.rst']:

        output = convert_doc(content)

    elif ext and ext in ['.mk']:

        output = markdown.markdown(content)

    return output