/**
 * @file llscrolllistitem.cpp
 * @brief Scroll lists are composed of rows (items), each of which
 * contains columns (cells).
 *
 * $LicenseInfo:firstyear=2001&license=viewerlgpl$
 * 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 "linden_common.h"

#include "llscrolllistitem.h"

#include "llrect.h"
#include "llui.h"


//---------------------------------------------------------------------------
// LLScrollListItem
//---------------------------------------------------------------------------

LLScrollListItem::LLScrollListItem( const Params& p )
:   mSelected(false),
    mHighlighted(false),
    mHoverIndex(-1),
    mSelectedIndex(-1),
    mEnabled(p.enabled),
    mUserdata(p.userdata),
    mItemValue(p.value),
    mItemAltValue(p.alt_value)
{
}


LLScrollListItem::~LLScrollListItem()
{
    std::for_each(mColumns.begin(), mColumns.end(), DeletePointer());
    mColumns.clear();
}

void LLScrollListItem::setSelected(bool b)
{
    mSelected = b;
    mSelectedIndex = -1;
}

void LLScrollListItem::setHighlighted(bool b)
{
    mHighlighted = b;
    mHoverIndex = -1;
}

void LLScrollListItem::setHoverCell(S32 cell)
{
    mHoverIndex = cell;
}

void LLScrollListItem::setSelectedCell(S32 cell)
{
    mSelectedIndex = cell;
}

void LLScrollListItem::addColumn(const LLScrollListCell::Params& p)
{
    mColumns.push_back(LLScrollListCell::create(p));
}

void LLScrollListItem::setNumColumns(S32 columns)
{
    auto prev_columns = mColumns.size();
    if (columns < prev_columns)
    {
        std::for_each(mColumns.begin()+columns, mColumns.end(), DeletePointer());
    }

    mColumns.resize(columns);

    for (auto col = prev_columns; col < columns; ++col)
    {
        mColumns[col] = NULL;
    }
}

void LLScrollListItem::setColumn( S32 column, LLScrollListCell *cell )
{
    if (column < (S32)mColumns.size())
    {
        delete mColumns[column];
        mColumns[column] = cell;
    }
    else
    {
        LL_ERRS() << "LLScrollListItem::setColumn: bad column: " << column << LL_ENDL;
    }
}


S32 LLScrollListItem::getNumColumns() const
{
    return static_cast<S32>(mColumns.size());
}

LLScrollListCell* LLScrollListItem::getColumn(const S32 i) const
{
    if (0 <= i && i < (S32)mColumns.size())
    {
        return mColumns[i];
    }
    return NULL;
}

std::string LLScrollListItem::getContentsCSV() const
{
    std::string ret;

    S32 count = getNumColumns();
    for (S32 i=0; i<count; ++i)
    {
        ret += getColumn(i)->getValue().asString();
        if (i < count-1)
        {
            ret += ", ";
        }
    }

    return ret;
}


void LLScrollListItem::draw(const LLRect& rect, const LLColor4& fg_color, const LLColor4& hover_color, const LLColor4& select_color, const LLColor4& highlight_color, S32 column_padding)
{
    // draw background rect
    gGL.getTexUnit(0)->unbind(LLTexUnit::TT_TEXTURE);
    LLRect bg_rect = rect;
    if (mSelectedIndex < 0 && getSelected())
    {
        // Whole item is highlighted/selected
        gl_rect_2d(bg_rect, select_color);
    }
    else if (mHoverIndex < 0)
    {
        // Whole item is highlighted/selected
        gl_rect_2d(bg_rect, hover_color);
    }

    S32 cur_x = rect.mLeft;
    S32 num_cols = getNumColumns();
    S32 cur_col = 0;

    for (LLScrollListCell* cell = getColumn(0); cur_col < num_cols; cell = getColumn(++cur_col))
    {
        // Two ways a cell could be hidden
        if (cell->getWidth() < 0
            || !cell->getVisible()) continue;

        LLUI::pushMatrix();
        {
            LLUI::translate((F32) cur_x, (F32) rect.mBottom);

            if (mSelectedIndex == cur_col)
            {
                // select specific cell
                LLRect highlight_rect(0,
                    cell->getHeight(),
                    cell->getWidth(),
                    0);
                gl_rect_2d(highlight_rect, select_color);
            }
            else if (mHoverIndex == cur_col)
            {
                // highlight specific cell
                LLRect highlight_rect(0,
                    cell->getHeight(),
                    cell->getWidth() ,
                    0);
                gl_rect_2d(highlight_rect, hover_color);
            }

            cell->draw( fg_color, highlight_color );
        }
        LLUI::popMatrix();

        cur_x += cell->getWidth() + column_padding;
    }
}