# -*- coding: utf-8 -*-
#
# This file is part of Invenio.
# Copyright (C) 2015-2019 CERN.
#
# Invenio is free software; you can redistribute it and/or modify it
# under the terms of the MIT License; see LICENSE file for more details.

"""Markdown rendering using mistune library."""

import bleach
import mistune
from flask import render_template

from ..proxies import current_previewer
from ..utils import detect_encoding

previewable_extensions = ["md"]


def render(file):
    """Render HTML from Markdown file content."""
    with file.open() as fp:
        encoding = detect_encoding(fp, default="utf-8")
        result = mistune.markdown(fp.read().decode(encoding))
        return result


def can_preview(file):
    """Determine if file can be previewed."""
    return file.is_local() and file.has_extensions(".md")


def preview(file):
    """Render Markdown."""
    return render_template(
        "invenio_previewer/mistune.html",
        file=file,
        content=render(file),
        js_bundles=current_previewer.js_bundles,
        css_bundles=current_previewer.css_bundles,
    )
