/**
 * @file lldockcontrol.cpp
 * @brief Creates a panel of a specific kind for a toast
 *
 * $LicenseInfo:firstyear=2000&license=viewerlgpl$
 * 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 "lldockcontrol.h"
#include "lldockablefloater.h"

LLDockControl::LLDockControl(LLView* dockWidget, LLFloater* dockableFloater,
        const LLUIImagePtr& dockTongue, DocAt dockAt, get_allowed_rect_callback_t get_allowed_rect_callback) :
        mDockableFloater(dockableFloater),
        mDockTongue(dockTongue),
        mDockTongueX(0),
        mDockTongueY(0)
{
    mDockAt = dockAt;

    if (dockWidget != NULL)
    {
        mDockWidgetHandle = dockWidget->getHandle();
    }

    mNonToolbarPanelHandle = mDockableFloater->getRootView()->getChild<LLView>("non_toolbar_panel")->getHandle();

    if (dockableFloater->isDocked())
    {
        on();
    }
    else
    {
        off();
    }

    if (!(get_allowed_rect_callback))
    {
        mGetAllowedRectCallback = boost::bind(&LLDockControl::getAllowedRect, this, _1);
    }
    else
    {
        mGetAllowedRectCallback = get_allowed_rect_callback;
    }

    if (dockWidget != NULL)
    {
        repositionDockable();
    }

    if (getDock() != NULL)
    {
        mDockWidgetVisible = isDockVisible();
    }
    else
    {
        mDockWidgetVisible = false;
    }
}

LLDockControl::~LLDockControl()
{
}

void LLDockControl::setDock(LLView* dockWidget)
{
    if (dockWidget != NULL)
    {
        mDockWidgetHandle = dockWidget->getHandle();
        repositionDockable();
        mDockWidgetVisible = isDockVisible();
    }
    else
    {
        mDockWidgetHandle = LLHandle<LLView>();
        mDockWidgetVisible = false;
    }
}

void LLDockControl::getAllowedRect(LLRect& rect)
{
    if(!mNonToolbarPanelHandle.isDead())
    {
        rect = mNonToolbarPanelHandle.get()->getRect();
    }
}

void LLDockControl::repositionDockable()
{
    if (!getDock()) return;
    LLRect dockRect = getDock()->calcScreenRect();
    LLRect rootRect;
    LLRect floater_rect = mDockableFloater->calcScreenRect();
    mGetAllowedRectCallback(rootRect);

    // recalculate dockable position if:
    if (mPrevDockRect != dockRect                   //dock position   changed
        || mDockWidgetVisible != isDockVisible()    //dock visibility changed
        || mRootRect != rootRect                    //root view rect  changed
        || mFloaterRect != floater_rect             //floater rect    changed
        || mRecalculateDockablePosition             //recalculation is forced
    )
    {
        // undock dockable and off() if dock not visible
        if (!isDockVisible())
        {
            mDockableFloater->setDocked(false);
            // force off() since dockable may not have dockControll at this time
            off();
            LLDockableFloater* dockable_floater =
                    dynamic_cast<LLDockableFloater*> (mDockableFloater);
            if(dockable_floater != NULL)
            {
                dockable_floater->onDockHidden();
            }
        }
        else
        {
            if(mEnabled)
            {
                moveDockable();
            }
            LLDockableFloater* dockable_floater =
                    dynamic_cast<LLDockableFloater*> (mDockableFloater);
            if(dockable_floater != NULL)
            {
                dockable_floater->onDockShown();
            }
        }

        mPrevDockRect = dockRect;
        mRootRect = rootRect;
        mFloaterRect = floater_rect;
        mRecalculateDockablePosition = false;
        mDockWidgetVisible = isDockVisible();
    }
}

bool LLDockControl::isDockVisible()
{
    bool res = true;

    if (getDock() != NULL)
    {
        //we should check all hierarchy
        res = getDock()->isInVisibleChain();
        if (res)
        {
            LLRect dockRect = getDock()->calcScreenRect();

            switch (mDockAt)
            {
            case LEFT: // to keep compiler happy
                break;
            case BOTTOM:
            case TOP:
            {
                // check is dock inside parent rect
                // assume that parent for all dockable floaters
                // is the root view
                LLRect dockParentRect =
                        getDock()->getRootView()->calcScreenRect();
                if (dockRect.mRight <= dockParentRect.mLeft
                        || dockRect.mLeft >= dockParentRect.mRight)
                {
                    res = false;
                }
                break;
            }
            default:
                break;
            }
        }
    }

    return res;
}

void LLDockControl::moveDockable()
{
    // calculate new dockable position
    LLRect dockRect = getDock()->calcScreenRect();
    LLRect rootRect;
    mGetAllowedRectCallback(rootRect);

    bool use_tongue = false;
    LLDockableFloater* dockable_floater =
            dynamic_cast<LLDockableFloater*> (mDockableFloater);
    if (dockable_floater != NULL)
    {
        use_tongue = dockable_floater->getUseTongue();
    }

    LLRect dockableRect = mDockableFloater->calcScreenRect();
    S32 x = 0;
    S32 y = 0;
    LLRect dockParentRect;
    switch (mDockAt)
    {
    case LEFT:

        x = dockRect.mLeft - dockableRect.getWidth();
        y = dockRect.getCenterY() + dockableRect.getHeight() / 2;

        if (use_tongue)
        {
            x -= mDockTongue->getWidth();
        }

        mDockTongueX = dockableRect.mRight;
        mDockTongueY = dockableRect.getCenterY() - mDockTongue->getHeight() / 2;

        break;

    case RIGHT:

        x = dockRect.mRight;
        y = dockRect.getCenterY() + dockableRect.getHeight() / 2;

        if (use_tongue)
        {
            x += mDockTongue->getWidth();
        }

        mDockTongueX = dockRect.mRight;
        mDockTongueY = dockableRect.getCenterY() - mDockTongue->getHeight() / 2;

        break;

    case TOP:
        x = dockRect.getCenterX() - dockableRect.getWidth() / 2;
        y = dockRect.mTop + dockableRect.getHeight();
        // unique docking used with dock tongue, so add tongue height to the Y coordinate
        if (use_tongue)
        {
            y += mDockTongue->getHeight();

            if ( y > rootRect.mTop)
            {
                y = rootRect.mTop;
            }
        }

        // check is dockable inside root view rect
        if (x < rootRect.mLeft)
        {
            x = rootRect.mLeft;
        }
        if (x + dockableRect.getWidth() > rootRect.mRight)
        {
            x = rootRect.mRight - dockableRect.getWidth();
        }


        // calculate dock tongue position
        dockParentRect = getDock()->getParent()->calcScreenRect();
        if (dockRect.getCenterX() < dockParentRect.mLeft)
        {
            mDockTongueX = dockParentRect.mLeft - mDockTongue->getWidth() / 2;
        }
        else if (dockRect.getCenterX() > dockParentRect.mRight)
        {
            mDockTongueX = dockParentRect.mRight - mDockTongue->getWidth() / 2;;
        }
        else
        {
            mDockTongueX = dockRect.getCenterX() - mDockTongue->getWidth() / 2;
        }
        mDockTongueY = dockRect.mTop;

        break;
    case BOTTOM:
        x = dockRect.getCenterX() - dockableRect.getWidth() / 2;
        y = dockRect.mBottom;
        // unique docking used with dock tongue, so add tongue height to the Y coordinate
        if (use_tongue)
        {
            y -= mDockTongue->getHeight();
        }

        // check is dockable inside root view rect
        if (x < rootRect.mLeft)
        {
            x = rootRect.mLeft;
        }
        if (x + dockableRect.getWidth() > rootRect.mRight)
        {
            x = rootRect.mRight - dockableRect.getWidth();
        }

        // calculate dock tongue position
        dockParentRect = getDock()->getParent()->calcScreenRect();
        if (dockRect.getCenterX() < dockParentRect.mLeft)
        {
            mDockTongueX = dockParentRect.mLeft - mDockTongue->getWidth() / 2;
        }
        else if (dockRect.getCenterX() > dockParentRect.mRight)
        {
            mDockTongueX = dockParentRect.mRight - mDockTongue->getWidth() / 2;;
        }
        else
        {
            mDockTongueX = dockRect.getCenterX() - mDockTongue->getWidth() / 2;
        }
        mDockTongueY = dockRect.mBottom - mDockTongue->getHeight();

        break;
    }

    S32 max_available_height = rootRect.getHeight() - (rootRect.mBottom -  mDockTongueY) - mDockTongue->getHeight();

    // A floater should be shrunk so it doesn't cover a part of its docking tongue and
    // there is a space between a dockable floater and a control to which it is docked.
    if (use_tongue && dockableRect.getHeight() >= max_available_height)
    {
        dockableRect.setLeftTopAndSize(x, y, dockableRect.getWidth(), max_available_height);
        mDockableFloater->reshape(dockableRect.getWidth(), dockableRect.getHeight());
    }
    else
    {
        // move dockable
        dockableRect.setLeftTopAndSize(x, y, dockableRect.getWidth(),
                dockableRect.getHeight());
    }

    LLRect localDocableParentRect;

    mDockableFloater->getParent()->screenRectToLocal(dockableRect, &localDocableParentRect);
    mDockableFloater->setRect(localDocableParentRect);
    mDockableFloater->screenPointToLocal(mDockTongueX, mDockTongueY, &mDockTongueX, &mDockTongueY);

}

void LLDockControl::on()
{
     if (isDockVisible())
    {
        mEnabled = true;
        mRecalculateDockablePosition = true;
    }
}

void LLDockControl::off()
{
    mEnabled = false;
}

void LLDockControl::forceRecalculatePosition()
{
    mRecalculateDockablePosition = true;
}

void LLDockControl::drawToungue()
{
    bool use_tongue = false;
    LLDockableFloater* dockable_floater =
            dynamic_cast<LLDockableFloater*> (mDockableFloater);
    if (dockable_floater != NULL)
    {
        use_tongue = dockable_floater->getUseTongue();
    }

    if (mEnabled && use_tongue)
    {
        mDockTongue->draw(mDockTongueX, mDockTongueY);
    }
}