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/* ----------------------------------------------------------------------- *

 * This file is part of GEL, http://www.imm.dtu.dk/GEL

 * Copyright (C) the authors and DTU Informatics

 * For license and list of authors, see ../../doc/intro.pdf

 * ----------------------------------------------------------------------- */

/**

  @file AttributeVector.h

 Contains an abstract class template for attribute vectors for HMesh entities. 

 Also contains templates for attribute vectors for concrete entities.

 */

#ifndef __HMESH_ATTRIBUTEVECTOR_H__

#define __HMESH_ATTRIBUTEVECTOR_H__

#include <cassert>

#include <vector>

#include <map>

namespace HMesh

{

    /** Abstract class for HMesh entity attribute vectors. This class is used for storing all attributes

     associated with any type of mesh entity - be it Vertex, HalfEdge, or Face. Also the position attribute

     is stored in an AttributeVector class.      

     */

    template<typename ITEM, typename ITEMID>

    class AttributeVector

    {

    public:

        /// Construct from optional size and item (size should be identical to number of entities in associated container

        AttributeVector(size_t _size = 0, ITEM item = ITEM());

        /// Add an item

       // ITEMID add(const ITEM& item);

        /// const reference to item given by ID

        const ITEM& get(ITEMID id) const;

        /// reference to item given by ID

        ITEM& get(ITEMID id);

        /// const reference to item given by ID

        const ITEM& operator [](ITEMID id) const;

        /// reference to item given by ID

        ITEM& operator [](ITEMID id);

        /// resize the vector (may be necessary if associated container size grows)

        void resize(size_t _size, ITEM item = ITEM());

        /// number of attribute items in vector

        size_t size() const;

        /// clear the vector

        void clear();

        /// clenup unused items from the vector, given by remap from associated container

        void cleanup(const std::map<ITEMID, ITEMID>& map);

    private:

        std::vector<ITEM> items;

    };

    template<typename ITEM>

    class VertexAttributeVector : public AttributeVector<ITEM, VertexID>

    {

    public:

        VertexAttributeVector(size_t _size = 0, ITEM item = ITEM());

    };

    template<typename ITEM>

    class FaceAttributeVector : public AttributeVector<ITEM, FaceID>

    {

    public:

        FaceAttributeVector(size_t _size = 0, ITEM item = ITEM());

    };

    template<typename ITEM>

    class HalfEdgeAttributeVector : public AttributeVector<ITEM, HalfEdgeID>

    {

    public:

        HalfEdgeAttributeVector(size_t _size = 0, ITEM item = ITEM());

    };

    template<typename ITEM>

    inline VertexAttributeVector<ITEM>::VertexAttributeVector(size_t _size, ITEM item) : AttributeVector<ITEM, VertexID>(_size, item){}

    template<typename ITEM>

    inline FaceAttributeVector<ITEM>::FaceAttributeVector(size_t _size, ITEM item) : AttributeVector<ITEM, FaceID>(_size, item){}

    template<typename ITEM>

    inline HalfEdgeAttributeVector<ITEM>::HalfEdgeAttributeVector(size_t _size, ITEM item) : AttributeVector<ITEM, HalfEdgeID>(_size, item){}

    template<typename ITEM, typename ITEMID>

    inline AttributeVector<ITEM, ITEMID>::AttributeVector(size_t _size, ITEM item) : items(_size, item){}

    template<typename ITEM, typename ITEMID>

    inline void AttributeVector<ITEM, ITEMID>::clear()

    { items.clear(); }

    template<typename ITEM, typename ITEMID>

    inline void AttributeVector<ITEM, ITEMID>::cleanup(const std::map<ITEMID, ITEMID>& remap)

    {

        std::vector<ITEM> new_items(remap.size());

        for(typename std::map<ITEMID, ITEMID>::const_iterator it = remap.begin(); it != remap.end(); ++it){

            assert(it->second.index < remap.size());

            new_items[it->second.index] = items[it->first.index];

        }

        std::swap(items, new_items);

    }

    template<typename ITEM, typename ITEMID>

    inline void AttributeVector<ITEM, ITEMID>::resize(size_t _size, ITEM item)

    { items.resize(_size, item); }

    template<typename ITEM, typename ITEMID>

    inline size_t AttributeVector<ITEM, ITEMID>::size() const

    { return items.size(); }

    // just returning should be ok; manifold and attribs should always be in sync.

    // const context means manifold and attribs should be const, hence in sync.

    template<typename ITEM, typename ITEMID>

    inline const ITEM& AttributeVector<ITEM, ITEMID>::get(ITEMID id) const

    { 

        assert(id.index < items.size());

        return items[id.index]; 

    }

    template<typename ITEM, typename ITEMID>

    inline ITEM& AttributeVector<ITEM, ITEMID>::get(ITEMID id)

    {

        if(id.index >= items.size())

            items.resize(id.index + 1);

        return items[id.index]; 

    }

    template<typename ITEM, typename ITEMID>

    inline const ITEM& AttributeVector<ITEM, ITEMID>::operator [](ITEMID id) const

    { 

        assert(id.index < items.size());

        return items[id.index]; 

    }

    template<typename ITEM, typename ITEMID>

    inline ITEM& AttributeVector<ITEM, ITEMID>::operator [](ITEMID id)

    {

        if(id.index >= items.size())

            items.resize(id.index + 1);

        return items[id.index]; 

    }

}

#endif