/**
 * @file llurlhistory.cpp
 * @brief Manages a list of recent URLs
 *
 * $LicenseInfo:firstyear=2007&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#include "llviewerprecompiledheaders.h"

#include "llurlhistory.h"

#include "lldir.h"
#include "llsdserialize.h"

LLSD LLURLHistory::sHistorySD;

const int MAX_URL_COUNT = 10;

/////////////////////////////////////////////////////////////////////////////

// static
bool LLURLHistory::loadFile(const std::string& filename)
{
    bool dataloaded = false;
    sHistorySD = LLSD();
    LLSD data;

    std::string user_filename(gDirUtilp->getLindenUserDir() + gDirUtilp->getDirDelimiter() + filename);

    llifstream file(user_filename.c_str());
    if (file.is_open())
    {
        LLSDSerialize::fromXML(data, file);
        if (data.isUndefined())
        {
            LL_WARNS() << "error loading " << user_filename << LL_ENDL;
        }
        else
        {
            LL_INFOS() << "Loaded history file at " << user_filename << LL_ENDL;
            sHistorySD = data;
            dataloaded = true;
        }
    }
    else
    {
        LL_INFOS() << "Unable to open history file at " << user_filename << LL_ENDL;
    }
    return dataloaded;
}

// static
bool LLURLHistory::saveFile(const std::string& filename)
{
    std::string temp_str = gDirUtilp->getLindenUserDir();
    if( temp_str.empty() )
    {
        LL_INFOS() << "Can't save URL history - no user directory set yet." << LL_ENDL;
        return false;
    }

    temp_str += gDirUtilp->getDirDelimiter() + filename;
    llofstream out(temp_str.c_str());
    if (!out.good())
    {
        LL_WARNS() << "Unable to open " << temp_str << " for output." << LL_ENDL;
        return false;
    }

    LLSDSerialize::toXML(sHistorySD, out);

    out.close();
    return true;
}
// static
// This function returns a portion of the history llsd that contains the collected
// url history
LLSD LLURLHistory::getURLHistory(const std::string& collection)
{
    if(sHistorySD.has(collection))
    {
        return sHistorySD[collection];
    }
    return LLSD();
}

// static
void LLURLHistory::addURL(const std::string& collection, const std::string& url)
{
    if(!url.empty())
    {
        LLURI u(url);
        std::string simplified_url = u.scheme() + "://" + u.authority() + u.path();
        sHistorySD[collection].insert(0, simplified_url);
        LLURLHistory::limitSize(collection);
    }
}
// static
void LLURLHistory::removeURL(const std::string& collection, const std::string& url)
{
    if(!url.empty())
    {
        LLURI u(url);
        std::string simplified_url = u.scheme() + "://" + u.authority() + u.path();
        for(int index = 0; index < sHistorySD[collection].size(); index++)
        {
            if(sHistorySD[collection].get(index).asString() == simplified_url)
            {
                sHistorySD[collection].erase(index);
            }
        }
    }
}

// static
void LLURLHistory::clear(const std::string& collection)
{
    sHistorySD[ collection ] = LLSD();
}

void LLURLHistory::limitSize(const std::string& collection)
{
    while(sHistorySD[collection].size() > MAX_URL_COUNT)
    {
        sHistorySD[collection].erase(MAX_URL_COUNT);
    }
}