#ifndef MBGL_GEOMETRY_TRIANGLE_ELEMENTS_BUFFER
#define MBGL_GEOMETRY_TRIANGLE_ELEMENTS_BUFFER

#include <mbgl/geometry/buffer.hpp>
#include <mbgl/geometry/vao.hpp>
#include <mbgl/util/noncopyable.hpp>

#include <array>

namespace mbgl {

template <int count>
struct ElementGroup : public util::noncopyable {
    std::array<VertexArrayObject, count> array;
    uint32_t vertex_length;
    uint32_t elements_length;

    ElementGroup() : vertex_length(0), elements_length(0) {}
    ElementGroup(uint32_t vertex_length_, uint32_t elements_length_)
        : vertex_length(vertex_length_),
          elements_length(elements_length_) {
    }

    ElementGroup(ElementGroup &&rhs) noexcept
        : array(std::move(rhs.array)),
          vertex_length(rhs.vertex_length),
          elements_length(rhs.elements_length) {};
};

class TriangleElementsBuffer : public Buffer<
    6, // bytes per triangle (3 * unsigned short == 6 bytes)
    GL_ELEMENT_ARRAY_BUFFER
> {
public:
    typedef uint16_t element_type;

    void add(element_type a, element_type b, element_type c);
};


class LineElementsBuffer : public Buffer<
    4, // bytes per triangle (2 * unsigned short == 6 bytes)
    GL_ELEMENT_ARRAY_BUFFER
> {
public:
    typedef uint16_t element_type;

    void add(element_type a, element_type b);
};

class PointElementsBuffer : public Buffer<
    2, // bytes per point (1 unsigned short)
    GL_ELEMENT_ARRAY_BUFFER
> {
public:
    typedef uint16_t element_type;

    void add(element_type a);
};

}

#endif