/*++

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Abstract:

NMR_ModelSliceStack.cpp: implementes the Model Slice Class.
A Model Slice represents a single slice as vertices and polygons

--*/

#include "Model/Classes/NMR_ModelSlice.h"
#include "Common/NMR_Exception.h"

namespace NMR {
	CSlice::CSlice(nfDouble dZTop)
	{
		m_dZTop = dZTop;
	}

	CSlice::CSlice(CSlice& other)
	{
		m_dZTop = other.m_dZTop;
		m_Vertices = other.m_Vertices;
		m_Polygons = other.m_Polygons;
	}

	CSlice::~CSlice()
	{
	}

	nfUint32 CSlice::beginPolygon()
	{
		m_Polygons.push_back(std::vector<nfUint32>());
		return (nfUint32)m_Polygons.size() - 1;
	}

	void CSlice::Clear()
	{
		m_Polygons.clear();
		m_Vertices.clear();
	}

	nfUint32 CSlice::addVertex(nfFloat x, nfFloat y)
	{
		SLICENODE cNode;

		cNode.m_position.m_fields[0] = x;
		cNode.m_position.m_fields[1] = y;

		cNode.m_index = (nfUint32)m_Vertices.size();

		m_Vertices.push_back(cNode);

		return cNode.m_index;
	}

	void CSlice::getVertex(nfUint32 nIndex, nfFloat *x, nfFloat *y)
	{
		if (nIndex >= m_Vertices.size())
			throw CNMRException(NMR_ERROR_INVALIDINDEX);

		*x = m_Vertices[nIndex].m_position.m_values.x;
		*y = m_Vertices[nIndex].m_position.m_values.y;
	}

	void CSlice::clearPolygon(nfUint32 nPolygonIndex)
	{
		if (nPolygonIndex >= m_Polygons.size())
			throw CNMRException(NMR_ERROR_INVALIDINDEX);
		m_Polygons[nPolygonIndex].clear();
	}

	void CSlice::addPolygonIndex(nfUint32 nPolygonIndex, nfUint32 nIndex)
	{
		if (nPolygonIndex >= m_Polygons.size())
			throw CNMRException(NMR_ERROR_INVALIDINDEX);

		if (nIndex >= m_Vertices.size())
			throw CNMRException(NMR_ERROR_INVALID_SLICESEGMENT_VERTEXINDEX);

		if (m_Polygons[nPolygonIndex].size() > 0) {
			if (m_Polygons[nPolygonIndex][m_Polygons[nPolygonIndex].size()-1] == nIndex)
				throw CNMRException(NMR_ERROR_INVALID_SLICESEGMENT_VERTEXINDEX);
		}
		m_Polygons[nPolygonIndex].push_back(nIndex);
	}

	nfUint32 CSlice::getPolygonCount()
	{
		return (nfUint32)m_Polygons.size();
	}

	nfDouble CSlice::getTopZ()
	{
		return m_dZTop;
	}

	void CSlice::setTopZ(nfDouble dZTop)
	{
		m_dZTop = dZTop;
	}

	_Ret_notnull_ SLICENODE *CSlice::getNode(nfUint32 nIndex)
	{
		return &m_Vertices[nIndex];
	}

	nfUint32 CSlice::getVertexCount()
	{
		return (nfUint32)m_Vertices.size();
	}

	bool CSlice::allPolygonsAreClosed()
	{
		for (auto polygon : m_Polygons) {
			if (polygon.size() > 1) {
				if (*polygon.begin() != *polygon.rbegin()) {
					return false;
				}
			}
		}
		return true;
	}

	bool CSlice::isPolygonValid(nfUint32 nPolygonIndex)
	{
		if (nPolygonIndex >= m_Polygons.size())
			throw CNMRException(NMR_ERROR_INVALIDINDEX);
		if (m_Polygons[nPolygonIndex].size() > 2)
			return true;
		if (m_Polygons[nPolygonIndex].size() <= 1)
			return false;
		// closed polygon must have 3 points or more.
		return m_Polygons[nPolygonIndex][0] != m_Polygons[nPolygonIndex][1];
	}

	nfUint32 CSlice::getPolygonIndex(nfUint32 nPolygonIndex, nfUint32 nIndexOfIndex)
	{
		if (nPolygonIndex >= m_Polygons.size())
			throw CNMRException(NMR_ERROR_INVALIDINDEX);

		if (nIndexOfIndex >= m_Polygons[nPolygonIndex].size())
			throw CNMRException(NMR_ERROR_INVALIDINDEX);

		return m_Polygons[nPolygonIndex][nIndexOfIndex];
	}

	nfUint32 CSlice::getPolygonIndexCount(nfUint32 nPolygonIndex)
	{
		if (nPolygonIndex >= m_Polygons.size())
			throw CNMRException(NMR_ERROR_INVALIDINDEX);

		return (nfUint32)m_Polygons[nPolygonIndex].size();
	}
}