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

# Copyright © 2015 Roberto Alsina and others.

# 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 smc.mw.

You will need, of course, to install smc.mw

"""

from __future__ import unicode_literals

import io
import os
import re

from lxml import etree
try:
    import smc.mw as mw
except ImportError:
    mw = None

from nikola.plugin_categories import PageCompiler
from nikola.utils import makedirs, req_missing, write_metadata

try:
    from collections import OrderedDict
except ImportError:
    OrderedDict = dict  # NOQA


class CompileMediaWiki(PageCompiler):
    """Compile mediawiki into HTML."""

    name = "mediawiki"
    demote_headers = True

    def compile(self, source, dest, is_two_file=True, post=None, lang=None):
        """Compile the source file into HTML and save as dest."""
        makedirs(os.path.dirname(dest))
        if mw is None:
            req_missing(['smc.mw'], 'build this site (compile with MediaWiki)', python=True)
        with io.open(dest, "w+", encoding="utf8") as out_file:
            with io.open(source, "r", encoding="utf8") as in_file:
                data = in_file.read()
            if not is_two_file:
                data = re.split('(\n\n|\r\n\r\n)', data, maxsplit=1)[-1]
            parser = mw.Parser(parseinfo=False, whitespace='', nameguard=False)
            ast = parser.parse(data, 'document', semantics=mw.Semantics(parser))
            output = etree.tostring(ast, encoding='utf8').decode('utf8')
            output, shortcode_deps = self.site.apply_shortcodes(output, filename=source, with_dependencies=True, extra_context=dict(post=post))
            out_file.write(output)
        if post is None:
            if shortcode_deps:
                self.logger.error(
                    "Cannot save dependencies for post {0} (post unknown)",
                    source)
        else:
            post._depfile[dest] += shortcode_deps

    def compile_html(self, source, dest, is_two_file=True):
        """Compile the post into HTML (deprecated API)."""
        try:
            post = self.site.post_per_input_file[source]
        except KeyError:
            post = None

        return compile(source, dest, is_two_file, post, None)

    def create_post(self, path, **kw):
        content = kw.pop('content', None)
        onefile = kw.pop('onefile', False)
        # is_page is not used by create_post as of now.
        kw.pop('is_page', False)

        metadata = {}
        metadata.update(self.default_metadata)
        metadata.update(kw)
        makedirs(os.path.dirname(path))
        if not content.endswith('\n'):
            content += '\n'
        with io.open(path, "w+", encoding="utf8") as fd:
            if onefile:
                fd.write(write_metadata(metadata))
                fd.write('\n\n')
            fd.write(content)
