//
//      aegis - project change supervisor
//      Copyright (C) 2004-2009, 2012 Peter Miller
//
//      This program is free software; you can redistribute it and/or modify
//      it under the terms of the GNU General Public License as published by
//      the Free Software Foundation; either version 3 of the License, or
//      (at your option) any later version.
//
//      This program is distributed in the hope that it will be useful,
//      but WITHOUT ANY WARRANTY; without even the implied warranty of
//      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//      GNU General Public License for more details.
//
//      You should have received a copy of the GNU General Public License
//      along with this program. If not, see
//      <http://www.gnu.org/licenses/>.
//

#include <common/ac/ctype.h>
#include <common/ac/stdio.h>

#include <common/nstring.h>
#include <common/str.h>
#include <libaegis/change.h>
#include <libaegis/emit/brief_descri.h>
#include <libaegis/http.h>


void
emit_change_brief_description(change::pointer cp)
{
    enum { default_midpoint = 20 };
    nstring s = cp->brief_description_get();
    if (s.empty())
        return;
    if (s.size() <= default_midpoint)
    {
        emit_change_href(cp, "menu");
        html_encode_string(s);
        printf("</a>");
        return;
    }

    //
    // Work backwards looking for a space to stop the link at like the
    // first line in a book chapter bolds the first line or the first
    // few words.
    //
    size_t midpoint = default_midpoint;
    while (midpoint > 0 && isalnum((unsigned char)s.c_str()[midpoint - 1]))
        --midpoint;
    while (midpoint > 0 && !isalnum((unsigned char)s.c_str()[midpoint - 1]))
        --midpoint;
    if (midpoint == 0)
    {
        //
        // Work forwards looking for a space to stop the link at like
        // the first line in a book chapter bolds the first line or the
        // first few words.
        //
        midpoint = default_midpoint;
        while
        (
            midpoint < s.size()
        &&
            midpoint < 2 * default_midpoint
        &&
            isalnum((unsigned char)s.c_str()[midpoint])
        )
            ++midpoint;
        if (midpoint >= 2 * default_midpoint)
        {
            //
            // Nothing seems to work, just split at the default place.
            //
            midpoint = default_midpoint;
        }
    }

    nstring left(s.c_str(), midpoint);
    nstring right(s.c_str() + midpoint, s.size() - midpoint);
    emit_change_href(cp, "menu");
    html_encode_string(left);
    printf("</a>");
    html_encode_string(right);
}


// vim: set ts=8 sw=4 et :