/** 
 * @file llmultifloater.cpp
 * @brief LLFloater that hosts other floaters
 *
 * $LicenseInfo:firstyear=2002&license=viewergpl$
 * 
 * Copyright (c) 2002-2009, Linden Research, Inc.
 * 
 * Second Life Viewer Source Code
 * The source code in this file ("Source Code") is provided by Linden Lab
 * to you under the terms of the GNU General Public License, version 2.0
 * ("GPL"), unless you have obtained a separate licensing agreement
 * ("Other License"), formally executed by you and Linden Lab.  Terms of
 * the GPL can be found in doc/GPL-license.txt in this distribution, or
 * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
 * 
 * There are special exceptions to the terms and conditions of the GPL as
 * it is applied to this Source Code. View the full text of the exception
 * in the file doc/FLOSS-exception.txt in this software distribution, or
 * online at
 * http://secondlifegrid.net/programs/open_source/licensing/flossexception
 * 
 * By copying, modifying or distributing this software, you acknowledge
 * that you have read and understood your obligations described above,
 * and agree to abide by those obligations.
 * 
 * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
 * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
 * COMPLETENESS OR PERFORMANCE.
 * $/LicenseInfo$
 */

// Floating "windows" within the GL display, like the inventory floater,
// mini-map floater, etc.

#include "linden_common.h"

#include "llmultifloater.h"
#include "llresizehandle.h"

//
// LLMultiFloater
//

LLMultiFloater::LLMultiFloater(const LLFloater::Params& params)
	: LLFloater(),
	  mTabContainer(NULL),
	  mTabPos(LLTabContainer::TOP),
	  mAutoResize(TRUE),
	  mOrigMinWidth(0),
	  mOrigMinHeight(0)
{
}

void LLMultiFloater::buildTabContainer()
{
	static LLUICachedControl<S32> floater_header_size ("UIFloaterHeaderSize", 0);
	
	LLTabContainer::Params p;
	p.name(std::string("Preview Tabs"));
	p.rect(LLRect(LLPANEL_BORDER_WIDTH, getRect().getHeight() - floater_header_size, getRect().getWidth() - LLPANEL_BORDER_WIDTH, 0));
	p.tab_position(mTabPos);
	p.follows.flags(FOLLOWS_ALL);
	p.commit_callback.function(boost::bind(&LLMultiFloater::onTabSelected, this));

	mTabContainer = LLUICtrlFactory::create<LLTabContainer>(p);
	addChild(mTabContainer);
	
	if (isResizable())
	{
		mTabContainer->setRightTabBtnOffset(RESIZE_HANDLE_WIDTH);
	}
}

void LLMultiFloater::onOpen(const LLSD& key)
{
	if (mTabContainer->getTabCount() <= 0)
	{
		// for now, don't allow multifloaters
		// without any child floaters
		closeFloater();
	}
}

void LLMultiFloater::onClose(bool app_quitting)
{
	if(closeAllFloaters() == TRUE)
	{
		LLFloater::onClose(app_quitting);
	}//else not all tabs could be closed...
}

void LLMultiFloater::draw()
{
	if (mTabContainer->getTabCount() == 0)
	{
		//RN: could this potentially crash in draw hierarchy?
		closeFloater();
	}
	else
	{
		for (S32 i = 0; i < mTabContainer->getTabCount(); i++)
		{
			LLFloater* floaterp = (LLFloater*)mTabContainer->getPanelByIndex(i);
			if (floaterp->getShortTitle() != mTabContainer->getPanelTitle(i))
			{
				mTabContainer->setPanelTitle(i, floaterp->getShortTitle());
			}
		}
		LLFloater::draw();
	}
}

BOOL LLMultiFloater::closeAllFloaters()
{
	S32	tabToClose = 0;
	S32	lastTabCount = mTabContainer->getTabCount();
	while (tabToClose < mTabContainer->getTabCount())
	{
		LLFloater* first_floater = (LLFloater*)mTabContainer->getPanelByIndex(tabToClose);
		first_floater->closeFloater();
		if(lastTabCount == mTabContainer->getTabCount())
		{
			//Tab did not actually close, possibly due to a pending Save Confirmation dialog..
			//so try and close the next one in the list...
			tabToClose++;
		}else
		{
			//Tab closed ok.
			lastTabCount = mTabContainer->getTabCount();
		}
	}
	if( mTabContainer->getTabCount() != 0 )
		return FALSE; // Couldn't close all the tabs (pending save dialog?) so return FALSE.
	return TRUE; //else all tabs were successfully closed...
}

void LLMultiFloater::growToFit(S32 content_width, S32 content_height)
{
	static LLUICachedControl<S32> tabcntr_close_btn_size ("UITabCntrCloseBtnSize", 0);
	static LLUICachedControl<S32> floater_header_size ("UIFloaterHeaderSize", 0);
	S32 tabcntr_header_height = LLPANEL_BORDER_WIDTH + tabcntr_close_btn_size;
	S32 new_width = llmax(getRect().getWidth(), content_width + LLPANEL_BORDER_WIDTH * 2);
	S32 new_height = llmax(getRect().getHeight(), content_height + floater_header_size + tabcntr_header_height);

    if (isMinimized())
    {
        LLRect newrect;
        newrect.setLeftTopAndSize(getExpandedRect().mLeft, getExpandedRect().mTop, new_width, new_height);
        setExpandedRect(newrect);
    }
	else
	{
		S32 old_height = getRect().getHeight();
		reshape(new_width, new_height);
		// keep top left corner in same position
		translate(0, old_height - new_height);
	}
}

/**
  void addFloater(LLFloater* floaterp, BOOL select_added_floater)

  Adds the LLFloater pointed to by floaterp to this.
  If floaterp is already hosted by this, then it is re-added to get
  new titles, etc.
  If select_added_floater is true, the LLFloater pointed to by floaterp will
  become the selected tab in this

  Affects: mTabContainer, floaterp
**/
void LLMultiFloater::addFloater(LLFloater* floaterp, BOOL select_added_floater, LLTabContainer::eInsertionPoint insertion_point)
{
	if (!floaterp)
	{
		return;
	}

	if (!mTabContainer)
	{
		llerrs << "Tab Container used without having been initialized." << llendl;
		return;
	}

	if (floaterp->getHost() == this)
	{
		// already hosted by me, remove
		// do this so we get updated title, etc.
		mFloaterDataMap.erase(floaterp->getHandle());
		mTabContainer->removeTabPanel(floaterp);
	}
	else if (floaterp->getHost())
	{
		// floaterp is hosted by somebody else and
		// this is adding it, so remove it from it's old host
		floaterp->getHost()->removeFloater(floaterp);
	}
	else if (floaterp->getParent() == gFloaterView)
	{
		// rehost preview floater as child panel
		gFloaterView->removeChild(floaterp);
	}

	// store original configuration
	LLFloaterData floater_data;
	floater_data.mWidth = floaterp->getRect().getWidth();
	floater_data.mHeight = floaterp->getRect().getHeight();
	floater_data.mCanMinimize = floaterp->isMinimizeable();
	floater_data.mCanResize = floaterp->isResizable();

	// remove minimize and close buttons
	floaterp->setCanMinimize(FALSE);
	floaterp->setCanResize(FALSE);
	floaterp->setCanDrag(FALSE);
	floaterp->storeRectControl();
	// avoid double rendering of floater background (makes it more opaque)
	floaterp->setBackgroundVisible(FALSE);

	if (mAutoResize)
	{
		growToFit(floater_data.mWidth, floater_data.mHeight);
	}

	//add the panel, add it to proper maps
	mTabContainer->addTabPanel(
		LLTabContainer::TabPanelParams()
			.panel(floaterp)
			.label(floaterp->getShortTitle())
			.insert_at(insertion_point));
	mFloaterDataMap[floaterp->getHandle()] = floater_data;

	updateResizeLimits();

	if ( select_added_floater )
	{
		mTabContainer->selectTabPanel(floaterp);
	}
	else
	{
		// reassert visible tab (hiding new floater if necessary)
		mTabContainer->selectTab(mTabContainer->getCurrentPanelIndex());
	}

	floaterp->setHost(this);
	if (isMinimized())
	{
		floaterp->setVisible(FALSE);
	}
}

/**
	BOOL selectFloater(LLFloater* floaterp)

	If the LLFloater pointed to by floaterp is hosted by this,
	then its tab is selected and returns true.  Otherwise returns false.

	Affects: mTabContainer
**/
BOOL LLMultiFloater::selectFloater(LLFloater* floaterp)
{
	return mTabContainer->selectTabPanel(floaterp);
}

// virtual
void LLMultiFloater::selectNextFloater()
{
	mTabContainer->selectNextTab();
}

// virtual
void LLMultiFloater::selectPrevFloater()
{
	mTabContainer->selectPrevTab();
}

void LLMultiFloater::showFloater(LLFloater* floaterp, LLTabContainer::eInsertionPoint insertion_point)
{
	if(!floaterp) return;
	// we won't select a panel that already is selected
	// it is hard to do this internally to tab container
	// as tab selection is handled via index and the tab at a given
	// index might have changed
	if (floaterp != mTabContainer->getCurrentPanel() &&
		!mTabContainer->selectTabPanel(floaterp))
	{
		addFloater(floaterp, TRUE, insertion_point);
	}
}

void LLMultiFloater::removeFloater(LLFloater* floaterp)
{
	if (!floaterp || floaterp->getHost() != this )
		return;

	floater_data_map_t::iterator found_data_it = mFloaterDataMap.find(floaterp->getHandle());
	if (found_data_it != mFloaterDataMap.end())
	{
		LLFloaterData& floater_data = found_data_it->second;
		floaterp->setCanMinimize(floater_data.mCanMinimize);
		if (!floater_data.mCanResize)
		{
			// restore original size
			floaterp->reshape(floater_data.mWidth, floater_data.mHeight);
		}
		floaterp->setCanResize(floater_data.mCanResize);
		mFloaterDataMap.erase(found_data_it);
	}
	mTabContainer->removeTabPanel(floaterp);
	floaterp->setBackgroundVisible(TRUE);
	floaterp->setCanDrag(TRUE);
	floaterp->setHost(NULL);
	floaterp->applyRectControl();

	updateResizeLimits();

	tabOpen((LLFloater*)mTabContainer->getCurrentPanel(), false);
}

void LLMultiFloater::tabOpen(LLFloater* opened_floater, bool from_click)
{
	// default implementation does nothing
}

void LLMultiFloater::tabClose()
{
	if (mTabContainer->getTabCount() == 0)
	{
		// no more children, close myself
		closeFloater();
	}
}

void LLMultiFloater::setVisible(BOOL visible)
{
	// *FIX: shouldn't have to do this, fix adding to minimized multifloater
	LLFloater::setVisible(visible);
	
	if (mTabContainer)
	{
		LLPanel* cur_floaterp = mTabContainer->getCurrentPanel();

		if (cur_floaterp)
		{
			cur_floaterp->setVisible(visible);
		}

		// if no tab selected, and we're being shown,
		// select last tab to be added
		if (visible && !cur_floaterp)
		{
			mTabContainer->selectLastTab();
		}
	}
}

BOOL LLMultiFloater::handleKeyHere(KEY key, MASK mask)
{
	if (key == 'W' && mask == MASK_CONTROL)
	{
		LLFloater* floater = getActiveFloater();
		// is user closeable and is system closeable
		if (floater && floater->canClose() && floater->isCloseable())
		{
			floater->closeFloater();
		}
		return TRUE;
	}

	return LLFloater::handleKeyHere(key, mask);
}

bool LLMultiFloater::addChild(LLView* child, S32 tab_group)
{
	LLTabContainer* tab_container = dynamic_cast<LLTabContainer*>(child);
	if (tab_container)
	{
		// store pointer to tab container
		setTabContainer(tab_container);
	}

	// then go ahead and add child as usual
	return LLFloater::addChild(child, tab_group);
}

LLFloater* LLMultiFloater::getActiveFloater()
{
	return (LLFloater*)mTabContainer->getCurrentPanel();
}

S32	LLMultiFloater::getFloaterCount()
{
	return mTabContainer->getTabCount();
}

/**
	BOOL isFloaterFlashing(LLFloater* floaterp)

	Returns true if the LLFloater pointed to by floaterp
	is currently in a flashing state and is hosted by this.
	False otherwise.

	Requires: floaterp != NULL
**/
BOOL LLMultiFloater::isFloaterFlashing(LLFloater* floaterp)
{
	if ( floaterp && floaterp->getHost() == this )
		return mTabContainer->getTabPanelFlashing(floaterp);

	return FALSE;
}

/**
	BOOL setFloaterFlashing(LLFloater* floaterp, BOOL flashing)

	Sets the current flashing state of the LLFloater pointed
	to by floaterp to be the BOOL flashing if the LLFloater pointed
	to by floaterp is hosted by this.

	Requires: floaterp != NULL
**/
void LLMultiFloater::setFloaterFlashing(LLFloater* floaterp, BOOL flashing)
{
	if ( floaterp && floaterp->getHost() == this )
		mTabContainer->setTabPanelFlashing(floaterp, flashing);
}

void LLMultiFloater::onTabSelected()
{
	LLFloater* floaterp = dynamic_cast<LLFloater*>(mTabContainer->getCurrentPanel());
	if (floaterp)
	{
		tabOpen(floaterp, true);
	}
}

void LLMultiFloater::setCanResize(BOOL can_resize)
{
	LLFloater::setCanResize(can_resize);
	if (isResizable() && mTabContainer->getTabPosition() == LLTabContainer::BOTTOM)
	{
		mTabContainer->setRightTabBtnOffset(RESIZE_HANDLE_WIDTH);
	}
	else
	{
		mTabContainer->setRightTabBtnOffset(0);
	}
}

BOOL LLMultiFloater::postBuild()
{
	// remember any original xml minimum size
	getResizeLimits(&mOrigMinWidth, &mOrigMinHeight);

	if (mTabContainer)
	{
		return TRUE;
	}

	requires<LLTabContainer>("Preview Tabs");
	if (checkRequirements())
	{
		mTabContainer = getChild<LLTabContainer>("Preview Tabs");
		return TRUE;
	}

	return FALSE;
}

void LLMultiFloater::updateResizeLimits()
{
	static LLUICachedControl<S32> tabcntr_close_btn_size ("UITabCntrCloseBtnSize", 0);
	static LLUICachedControl<S32> floater_header_size ("UIFloaterHeaderSize", 0);
	S32 tabcntr_header_height = LLPANEL_BORDER_WIDTH + tabcntr_close_btn_size;
	// initialize minimum size constraint to the original xml values.
	S32 new_min_width = mOrigMinWidth;
	S32 new_min_height = mOrigMinHeight;
	// possibly increase minimum size constraint due to children's minimums.
	for (S32 tab_idx = 0; tab_idx < mTabContainer->getTabCount(); ++tab_idx)
	{
		LLFloater* floaterp = (LLFloater*)mTabContainer->getPanelByIndex(tab_idx);
		if (floaterp)
		{
			new_min_width = llmax(new_min_width, floaterp->getMinWidth() + LLPANEL_BORDER_WIDTH * 2);
			new_min_height = llmax(new_min_height, floaterp->getMinHeight() + floater_header_size + tabcntr_header_height);
		}
	}
	setResizeLimits(new_min_width, new_min_height);

	S32 cur_height = getRect().getHeight();
	S32 new_width = llmax(getRect().getWidth(), new_min_width);
	S32 new_height = llmax(getRect().getHeight(), new_min_height);

	if (isMinimized())
	{
		const LLRect& expanded = getExpandedRect();
		LLRect newrect;
		newrect.setLeftTopAndSize(expanded.mLeft, expanded.mTop, llmax(expanded.getWidth(), new_width), llmax(expanded.getHeight(), new_height));
		setExpandedRect(newrect);
	}
	else
	{
		reshape(new_width, new_height);

		// make sure upper left corner doesn't move
		translate(0, cur_height - getRect().getHeight());

		// make sure this window is visible on screen when it has been modified
		// (tab added, etc)
		gFloaterView->adjustToFitScreen(this, TRUE);
	}
}