/*!
	@file
	@author		Albert Semenov
	@date		02/2008
	@module
*/
/*
	This file is part of MyGUI.

	MyGUI 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, either version 3 of the License, or
	(at your option) any later version.

	MyGUI 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 MyGUI.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "MyGUI_Precompiled.h"
#include "MyGUI_LayerItem.h"
#include "MyGUI_OverlappedLayer.h"
#include "MyGUI_LayerNode.h"
#include "MyGUI_RenderManager.h"

namespace MyGUI
{

	OverlappedLayer::OverlappedLayer() :
		mIsPick(false)
	{
	}

	OverlappedLayer::~OverlappedLayer()
	{
		MYGUI_ASSERT(mChildItems.empty(), "Layer '" << getName() << "' must be empty before destroy");
	}

	void OverlappedLayer::deserialization(xml::ElementPtr _node, Version _version)
	{
		mName = _node->findAttribute("name");
		if (_version >= Version(1, 2))
		{
			MyGUI::xml::ElementEnumerator propert = _node->getElementEnumerator();
			while (propert.next("Property"))
			{
				const std::string& key = propert->findAttribute("key");
				const std::string& value = propert->findAttribute("value");
				if (key == "Pick") mIsPick = utility::parseValue<bool>(value);
			}
		}
		else
		{
			mIsPick = utility::parseBool(_version < Version(1, 0) ? _node->findAttribute("peek") : _node->findAttribute("pick"));
		}
	}

	ILayerNode * OverlappedLayer::createChildItemNode()
	{
		// создаем рутовый айтем
		ILayerNode * node = new LayerNode(this);
		mChildItems.push_back(node);

		return node;
	}

	void OverlappedLayer::destroyChildItemNode(ILayerNode* _item)
	{
		// если есть отец, то русть сам и удаляет
		ILayerNode * parent = _item->getParent();
		if (parent)
		{
			parent->destroyChildItemNode(_item);
			return;
		}

		// айтем рутовый, мы удаляем
		for (VectorILayerNode::iterator iter=mChildItems.begin(); iter!=mChildItems.end(); ++iter)
		{
			if ((*iter) == _item)
			{
				delete _item;
				mChildItems.erase(iter);
				return;
			}
		}
		MYGUI_EXCEPT("item node not found");
	}

	void OverlappedLayer::upChildItemNode(ILayerNode* _item)
	{
		// если есть отец, то пусть сам рулит
		ILayerNode* parent = _item->getParent();
		if (parent != nullptr)
		{
			parent->upChildItemNode(_item);
			return;
		}

		if ((2 > mChildItems.size()) || (mChildItems.back() == _item)) return;
		for (VectorILayerNode::iterator iter=mChildItems.begin(); iter!=mChildItems.end(); ++iter)
		{
			if ((*iter) == _item)
			{
				mChildItems.erase(iter);
				mChildItems.push_back(_item);
				return;
			}
		}

		MYGUI_EXCEPT("item node not found");
	}

	ILayerItem * OverlappedLayer::getLayerItemByPoint(int _left, int _top)
	{
		if (!mIsPick) return nullptr;
		VectorILayerNode::reverse_iterator iter = mChildItems.rbegin();
		while (iter != mChildItems.rend())
		{
			ILayerItem * item = (*iter)->getLayerItemByPoint(_left, _top);
			if (item != nullptr) return item;
			++iter;
		}
		return nullptr;
	}

	IntPoint OverlappedLayer::getPosition(int _left, int _top) const
	{
		return IntPoint(_left, _top);
	}

	void OverlappedLayer::renderToTarget(IRenderTarget* _target, bool _update)
	{
		for (VectorILayerNode::iterator iter=mChildItems.begin(); iter!=mChildItems.end(); ++iter)
		{
			(*iter)->renderToTarget(_target, _update);
		}
	}

	EnumeratorILayerNode OverlappedLayer::getEnumerator()
	{
		return EnumeratorILayerNode(mChildItems);
	}

	void OverlappedLayer::dumpStatisticToLog()
	{
		static const char* spacer = "                                                                                                                        ";
		MYGUI_LOG(Info, spacer);
		MYGUI_LOG(Info, "Layer name='" << getName() << "'" << " type='" << getTypeName() << "'" << spacer);
		MYGUI_LOG(Info, "Count root nodes : " << mChildItems.size() << spacer);

		for (VectorILayerNode::iterator iter=mChildItems.begin(); iter!=mChildItems.end(); ++iter)
		{
			(*iter)->dumpStatisticToLog(0);
		}
	}

	const IntSize& OverlappedLayer::getSize() const
	{
		return RenderManager::getInstance().getViewSize();
	}

} // namespace MyGUI