/*      _______   __   __   __   ______   __   __   _______   __   __
 *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\
 *    / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
 *   / / /__   / / // / // / // / /    / ___  / // ___  / // /| ' / /
 *  / /_// /\ / /_// / // / // /_/_   / / // / // /\_/ / // / |  / /
 * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
 *
 * Copyright (c) 2004, 2005, 2006, 2007 Olof Naessén and Per Larsson
 *
 *                                                         Js_./
 * Per Larsson a.k.a finalman                          _RqZ{a<^_aa
 * Olof Naessén a.k.a jansem/yakslem                _asww7!uY`>  )\a//
 *                                                 _Qhm`] _f "'c  1!5m
 * Visit: http://guichan.darkbits.org             )Qk<P ` _: :+' .'  "{[
 *                                               .)j(] .d_/ '-(  P .   S
 * License: (BSD)                                <Td/Z <fP"5(\"??"\a.  .L
 * Redistribution and use in source and          _dV>ws?a-?'      ._/L  #'
 * binary forms, with or without                 )4d[#7r, .   '     )d`)[
 * modification, are permitted provided         _Q-5'5W..j/?'   -?!\)cam'
 * that the following conditions are met:       j<<WP+k/);.        _W=j f
 * 1. Redistributions of source code must       .$%w\/]Q  . ."'  .  mj$
 *    retain the above copyright notice,        ]E.pYY(Q]>.   a     J@\
 *    this list of conditions and the           j(]1u<sE"L,. .   ./^ ]{a
 *    following disclaimer.                     4'_uomm\.  )L);-4     (3=
 * 2. Redistributions in binary form must        )_]X{Z('a_"a7'<a"a,  ]"[
 *    reproduce the above copyright notice,       #}<]m7`Za??4,P-"'7. ).m
 *    this list of conditions and the            ]d2e)Q(<Q(  ?94   b-  LQ/
 *    following disclaimer in the                <B!</]C)d_, '(<' .f. =C+m
 *    documentation and/or other materials      .Z!=J ]e []('-4f _ ) -.)m]'
 *    provided with the distribution.          .w[5]' _[ /.)_-"+?   _/ <W"
 * 3. Neither the name of Guichan nor the      :$we` _! + _/ .        j?
 *    names of its contributors may be used     =3)= _f  (_yQmWW$#(    "
 *    to endorse or promote products derived     -   W,  sQQQQmZQ#Wwa]..
 *    from this software without specific        (js, \[QQW$QWW#?!V"".
 *    prior written permission.                    ]y:.<\..          .
 *                                                 -]n w/ '         [.
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT       )/ )/           !
 * HOLDERS AND CONTRIBUTORS "AS IS" AND ANY         <  (; sac    ,    '
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING,               ]^ .-  %
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF            c <   r
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR            aga<  <La
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE          5%  )P'-3L
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR        _bQf` y`..)a
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,          ,J?4P'.P"_(\?d'.,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES               _Pa,)!f/<[]/  ?"
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT      _2-..:. .r+_,.. .
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,     ?a.<%"'  " -'.a_ _,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION)                     ^
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * For comments regarding functions please see the header file.
 */

#include "guisan/basiccontainer.hpp"

#include <algorithm>

#include "guisan/exception.hpp"
#include "guisan/focushandler.hpp"
#include "guisan/graphics.hpp"
#include "guisan/mouseinput.hpp"

namespace gcn
{
	BasicContainer::~BasicContainer()
	{
		clear();
	}

	void BasicContainer::moveToTop(Widget* widget)
	{
		for (auto iter = mWidgets.begin(); iter != mWidgets.end(); ++iter)
		{
			if (*iter == widget)
			{
				mWidgets.erase(iter);
				mWidgets.push_back(widget);
				return;
			}
		}

		throw GCN_EXCEPTION("There is no such widget in this container.");
	}

	void BasicContainer::moveToBottom(Widget* widget)
	{
		const auto iter = find(mWidgets.begin(), mWidgets.end(), widget);

		if (iter == mWidgets.end())
		{
			throw GCN_EXCEPTION("There is no such widget in this container.");
		}
		mWidgets.erase(iter);
		mWidgets.push_front(widget);
	}

	void BasicContainer::death(const Event& event)
	{
		const auto iter = find(mWidgets.begin(), mWidgets.end(), event.getSource());

		if (iter == mWidgets.end())
		{
			throw GCN_EXCEPTION("There is no such widget in this container.");
		}

		mWidgets.erase(iter);
	}

	Rectangle BasicContainer::getChildrenArea()
	{
		return Rectangle(0, 0, getWidth(), getHeight());
	}

	void BasicContainer::focusNext()
	{
		WidgetListIterator it;

		for (it = mWidgets.begin(); it != mWidgets.end(); ++it)
		{
			if ((*it)->isFocused())
			{
				break;
			}
		}

		const WidgetListIterator end = it;

		if (it == mWidgets.end())
		{
			it = mWidgets.begin();
		}

		++it;

		for (; it != end; ++it)
		{
			if (it == mWidgets.end())
			{
				it = mWidgets.begin();
			}

			if ((*it)->isFocusable())
			{
				(*it)->requestFocus();
				return;
			}
		}
	}

	void BasicContainer::focusPrevious()
	{
		WidgetListReverseIterator it;

		for (it = mWidgets.rbegin(); it != mWidgets.rend(); ++it)
		{
			if ((*it)->isFocused())
			{
				break;
			}
		}

		const WidgetListReverseIterator end = it;

		++it;

		if (it == mWidgets.rend())
		{
			it = mWidgets.rbegin();
		}

		for (; it != end; ++it)
		{
			if (it == mWidgets.rend())
			{
				it = mWidgets.rbegin();
			}

			if ((*it)->isFocusable())
			{
				(*it)->requestFocus();
				return;
			}
		}
	}

	Widget* BasicContainer::getWidgetAt(int x, int y)
	{
		const Rectangle r = getChildrenArea();

		if (!r.isPointInRect(x, y))
		{
			return NULL;
		}

		x -= r.x;
		y -= r.y;

		for (auto it = mWidgets.rbegin(); it != mWidgets.rend(); ++it)
		{
			if ((*it)->isVisible() && (*it)->getDimension().isPointInRect(x, y))
			{
				return (*it);
			}
		}

		return NULL;
	}

	void BasicContainer::logic()
	{
		logicChildren();
	}

	void BasicContainer::_setFocusHandler(FocusHandler* focusHandler)
	{
		Widget::_setFocusHandler(focusHandler);

		if (mInternalFocusHandler != NULL)
		{
			return;
		}

		for (auto& mWidget : mWidgets)
		{
			mWidget->_setFocusHandler(focusHandler);
		}
	}

	void BasicContainer::add(Widget* widget)
	{
		mWidgets.push_back(widget);

		if (mInternalFocusHandler == NULL)
		{
			widget->_setFocusHandler(_getFocusHandler());
		}
		else
		{
			widget->_setFocusHandler(mInternalFocusHandler);
		}

		widget->_setParent(this);
		widget->addDeathListener(this);
	}

	void BasicContainer::remove(Widget* widget)
	{
		for (auto iter = mWidgets.begin(); iter != mWidgets.end(); ++iter)
		{
			if (*iter == widget)
			{
				mWidgets.erase(iter);
				widget->_setFocusHandler(NULL);
				widget->_setParent(NULL);
				widget->removeDeathListener(this);
				return;
			}
		}

		throw GCN_EXCEPTION("There is no such widget in this container.");
	}

	void BasicContainer::clear()
	{
		for (auto& mWidget : mWidgets)
		{
			mWidget->_setFocusHandler(NULL);
			mWidget->_setParent(NULL);
			mWidget->removeDeathListener(this);
		}

		mWidgets.clear();
	}

	void BasicContainer::drawChildren(Graphics* graphics)
	{
		graphics->pushClipArea(getChildrenArea());

		for (auto& mWidget : mWidgets)
		{
			if (mWidget->isVisible())
			{
				// If the widget has a border,
				// draw it before drawing the widget
				if (mWidget->getBorderSize() > 0)
				{
					Rectangle rec = mWidget->getDimension();
					rec.x -= static_cast<int>(mWidget->getBorderSize());
					rec.y -= static_cast<int>(mWidget->getBorderSize());
					rec.width += 2 * static_cast<int>(mWidget->getBorderSize());
					rec.height += 2 * static_cast<int>(mWidget->getBorderSize());
					graphics->pushClipArea(rec);
					mWidget->drawBorder(graphics);
					graphics->popClipArea();
				}

				graphics->pushClipArea(mWidget->getDimension());
				mWidget->draw(graphics);
				graphics->popClipArea();
			}
		}

		graphics->popClipArea();
	}

	void BasicContainer::logicChildren()
	{
		for (auto& mWidget : mWidgets)
		{
			mWidget->logic();
		}
	}

	void BasicContainer::showWidgetPart(Widget* widget, Rectangle area)
	{
		const Rectangle widgetArea = getChildrenArea();
		area.x += widget->getX();
		area.y += widget->getY();

		if (area.x + area.width > widgetArea.width)
		{
			widget->setX(widget->getX() - area.x - area.width + widgetArea.width);
		}

		if (area.y + area.height > widgetArea.height)
		{
			widget->setY(widget->getY() - area.y - area.height + widgetArea.height);
		}

		if (area.x < 0)
		{
			widget->setX(widget->getX() - area.x);
		}

		if (area.y < 0)
		{
			widget->setY(widget->getY() - area.y);
		}
	}


	void BasicContainer::setInternalFocusHandler(FocusHandler* focusHandler)
	{
		Widget::setInternalFocusHandler(focusHandler);

		for (auto& mWidget : mWidgets)
		{
			if (mInternalFocusHandler == NULL)
			{
				mWidget->_setFocusHandler(_getFocusHandler());
			}
			else
			{
				mWidget->_setFocusHandler(mInternalFocusHandler);
			}
		}
	}

	Widget* BasicContainer::findWidgetById(const std::string& id)
	{
		for (auto& mWidget : mWidgets)
		{
			if (mWidget->getId() == id)
			{
				return mWidget;
			}

			BasicContainer *basicContainer = dynamic_cast<BasicContainer*>(mWidget);

			if (basicContainer != NULL)
			{
				Widget *widget = basicContainer->findWidgetById(id);

				if (widget != NULL)
				{
					return widget;
				}
			}
		}

		return NULL;
	}
}
