/*
 * barrier -- mouse and keyboard sharing utility
 * Copyright (C) 2012-2016 Symless Ltd.
 * Copyright (C) 2004 Chris Schoeneman
 *
 * This package is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * found in the file LICENSE that should have accompanied this file.
 *
 * This package 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 "platform/MSWindowsClipboardHTMLConverter.h"

#include "base/String.h"

//
// MSWindowsClipboardHTMLConverter
//

MSWindowsClipboardHTMLConverter::MSWindowsClipboardHTMLConverter()
{
    m_format = RegisterClipboardFormat("HTML Format");
}

MSWindowsClipboardHTMLConverter::~MSWindowsClipboardHTMLConverter()
{
    // do nothing
}

IClipboard::EFormat
MSWindowsClipboardHTMLConverter::getFormat() const
{
    return IClipboard::kHTML;
}

UINT
MSWindowsClipboardHTMLConverter::getWin32Format() const
{
    return m_format;
}

std::string MSWindowsClipboardHTMLConverter::doFromIClipboard(const std::string& data) const
{
    // prepare to CF_HTML format prefix and suffix
    std::string prefix("Version:0.9\r\nStartHTML:0000000105\r\n"
                    "EndHTML:ZZZZZZZZZZ\r\n"
                    "StartFragment:XXXXXXXXXX\r\nEndFragment:YYYYYYYYYY\r\n"
                    "<!DOCTYPE><HTML><BODY><!--StartFragment-->");
    std::string suffix("<!--EndFragment--></BODY></HTML>\r\n");

    // Get byte offsets for header
    UInt32 StartFragment = (UInt32)prefix.size();
    UInt32 EndFragment   = StartFragment + (UInt32)data.size();
    // StartHTML is constant by the design of the prefix
    UInt32 EndHTML = EndFragment + (UInt32)suffix.size();

    prefix.replace(prefix.find("XXXXXXXXXX"), 10,
                            barrier::string::sprintf("%010u", StartFragment));
    prefix.replace(prefix.find("YYYYYYYYYY"), 10,
                            barrier::string::sprintf("%010u", EndFragment));
    prefix.replace(prefix.find("ZZZZZZZZZZ"), 10,
                            barrier::string::sprintf("%010u", EndHTML));

    // concatenate
    prefix += data;
    prefix += suffix;
    return prefix;
}

std::string MSWindowsClipboardHTMLConverter::doToIClipboard(const std::string& data) const
{
    // get fragment start/end args
    std::string startArg = findArg(data, "StartFragment");
    std::string endArg   = findArg(data, "EndFragment");
    if (startArg.empty() || endArg.empty()) {
        return std::string();
    }

    // convert args to integers
    SInt32 start = (SInt32)atoi(startArg.c_str());
    SInt32 end   = (SInt32)atoi(endArg.c_str());
    if (start <= 0 || end <= 0 || start >= end) {
        return std::string();
    }

    // extract the fragment
    return data.substr(start, end - start);
}

std::string MSWindowsClipboardHTMLConverter::findArg(const std::string& data,
                                                     const std::string& name) const
{
    std::string::size_type i = data.find(name);
    if (i == std::string::npos) {
        return std::string();
    }
    i = data.find_first_of(":\r\n", i);
    if (i == std::string::npos || data[i] != ':') {
        return std::string();
    }
    i = data.find_first_of("0123456789\r\n", i + 1);
    if (i == std::string::npos || data[i] == '\r' || data[i] == '\n') {
        return std::string();
    }
    std::string::size_type j = data.find_first_not_of("0123456789", i);
    if (j == std::string::npos) {
        j = data.size();
    }
    return data.substr(i, j - i);
}
