#include "stdafx.h"
#include "ActionLayerDragDropItem.h"
#include "SigmaDoc.h"
#include "SigmaView.h"
#include "Util.h"
#include "Visitor.h"

NAction::CActionLayerDragDropItem::CActionLayerDragDropItem()
	: CActionItem(nullptr, 0)
{
}

NAction::CActionLayerDragDropItem::CActionLayerDragDropItem(CSigmaDoc* ppDoc, const CLayerLocation &oldLocation, const CLayerLocation &newLocation)
	: CActionItem(ppDoc, ActionTypeLayerDragDrop),
	m_oldLocation(oldLocation),
	m_newLocation(newLocation)
{
}

void NAction::CActionLayerDragDropItem::Undo()
{
	Move(m_newLocation, m_oldLocation);
}

POSITION NAction::CActionLayerDragDropItem::GetFirstChildLayerPosition(CString layerName)
{
	auto pred = [&layerName](CLayer* pLayer)
		{
			CLayerName targetLayerName(layerName);
			CString name = pLayer->GetName();
			return targetLayerName.IsChild(name);
		};

	return GetMatchPosition(layerName, pred);
}

POSITION CActionLayerDragDropItem::GetLayerPosition(CString layerName)
{
    auto isMatchingLayer = [&layerName](CLayer* pLayer)
    {
        CString currentName = pLayer->GetName();
        CLayerName targetLayerName(layerName);
		return targetLayerName == currentName;
    };

    return GetMatchPosition(layerName, isMatchingLayer);
}

POSITION CActionLayerDragDropItem::GetMatchPosition(CString strLayer, std::function<bool(CLayer*)> pred)
{	
	CLayerName layerName(strLayer);
	CLayerList* pClass = GetDoc()->GetDraw()->GetClass(layerName.GetClassName());
	if (pClass == nullptr)
	{
		return nullptr;
	}

	CListForEach(pos, *pClass)
	{
		CLayer *pLayer = pClass->GetAt(pos);
		if (pred(pLayer))
		{
			return pos;
		}
	}

	return nullptr;
}

void NAction::CActionLayerDragDropItem::Move(const CLayerLocation& oldLocation, const CLayerLocation& newLocation)
{
	CString oldLayer = oldLocation.layer;
	CString oldParent = GetParentLayerPath(oldLayer);
	CString oldPrev = oldLocation.prevLayer;

	CString newLayer = newLocation.layer;
	CString newParent = GetParentLayerPath(newLayer);
	CString newPrev = newLocation.prevLayer;

	if (oldParent == newParent) // 只是进行了同层移动
	{
		if (newPrev.IsEmpty())
		{
			POSITION pos = GetFirstChildLayerPosition(newParent);
			GetDoc()->GetDraw()->MoveLayerInSameClassSeries(oldLayer, TRUE, pos, 0);
		}
		else
		{
			POSITION pos = GetLayerPosition(newPrev);
			GetDoc()->GetDraw()->MoveLayerInSameClassSeries(oldLayer, TRUE, pos, 1);
		}
	}
	else // 跨层移动
	{
		if (newPrev.IsEmpty())
		{
			POSITION pos = GetFirstChildLayerPosition(newParent);
			GetDoc()->GetDraw()->MoveLayer(oldLayer, newParent, TRUE, pos, 0);
		}
		else
		{
			POSITION pos = GetLayerPosition(newPrev);
			GetDoc()->GetDraw()->MoveLayer(oldLayer, newParent, TRUE, pos, 1);
		}
	}

}

void NAction::CActionLayerDragDropItem::Redo()
{
	Move(m_oldLocation, m_newLocation);
}

void NAction::CActionLayerDragDropItem::accept(CActionVisitor& visitor)
{
	visitor.visit(*this);
}