# Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
# All rights reserved. Contact: Pasi Eronen <pasi.eronen@nokia.com>
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
#  * Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
#  * Redistributions in binary form must reproduce the above
#    copyright notice, this list of conditions and the following
#    disclaimer in the documentation and/or other materials provided
#    with the distribution.
#
#  * Neither the name of the Nokia Corporation and/or its
#    subsidiary(-ies) nor the names of its contributors may be used
#    to endorse or promote products derived from this software
#    without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

import re
import six
import string

from django.utils.html import escape

from ietf.utils import log
from ietf.utils.text import wordwrap

def markup_ascii(content, width=None):
    log.unreachable('2017-12-08')
    if six.PY2:
        assert isinstance(content, basestring)
        # at this point, "content" is normal string
        # fix most common non-ASCII characters
        t1 = string.maketrans("\x91\x92\x93\x94\x95\x96\x97\xc6\xe8\xe9", "\'\'\"\"o--\'ee")
        # map everything except printable ASCII, TAB, LF, FF to "?"
        t2 = string.maketrans('','')
        t3 = "?"*9 + "\t\n?\f" + "?"*19 + t2[32:127] + "?"*129
        t4 = t1.translate(t3)
        content = content.translate(t4)
    else:
        log.assertion('six.PY2')
    return markup(content.decode('ascii'), width)

def markup(content, width=None):
    log.assertion('isinstance(content, six.text_type)')
    # normalize line endings to LF only
    content = content.replace("\r\n", "\n")
    content = content.replace("\r", "\n")

    # remove leading white space
    content = content.lstrip()
    # remove runs of blank lines
    content = re.sub("\n\n\n+", "\n\n", content)

    # maybe wordwrap.  This must be done before the escaping below.
    if width:
        content = wordwrap(content, width)

    # expand tabs + escape 
    content = escape(content.expandtabs())

    content = re.sub("\n(.+\[Page \d+\])\n\f\n(.+)\n", """\n<span class="m_ftr">\g<1></span>\n<span class="m_hdr">\g<2></span>\n""", content)
    content = re.sub("\n(.+\[Page \d+\])\n\s*$", """\n<span class="m_ftr">\g<1></span>\n""", content)
    # remove remaining FFs (to be valid XHTML)
    content = content.replace("\f","\n")

    content = re.sub("\n\n([0-9]+\\.|[A-Z]\\.[0-9]|Appendix|Status of|Abstract|Table of|Full Copyright|Copyright|Intellectual Property|Acknowled|Author|Index)(.*)(?=\n\n)", """\n\n<span class="m_h">\g<1>\g<2></span>""", content)

    return "<pre>" + content + "</pre>\n"