#include <psemek/gfx/mesh.hpp>

#include <psemek/util/to_string.hpp>

namespace psemek::gfx
{

	namespace detail
	{

		void check_vertex_size(std::size_t vertex_size, std::size_t stride)
		{
			if (vertex_size != stride)
				throw std::runtime_error(util::to_string("Vertex size (", vertex_size, ") not equal to sum of attribute sizes (", stride, ")"));
		}

		void check_instance_size(std::size_t instance_size, std::size_t stride)
		{
			if (instance_size != stride)
				throw std::runtime_error(util::to_string("Instance size (", instance_size, ") not equal to sum of instanced attribute sizes (", stride, ")"));
		}

	}

	mesh mesh::null()
	{
		return mesh(0);
	}

	mesh::mesh()
	{
		gl::GenVertexArrays(1, &array_);
		gl::GenBuffers(1, &buffer_);
	}

	mesh::mesh(mesh && other)
	{
		array_ = other.array_;
		buffer_ = other.buffer_;
		count_ = other.count_;
		stride_ = other.stride_;
		primitive_type_ = other.primitive_type_;

		other.array_ = 0;
		other.buffer_ = 0;
		other.count_ = 0;
		other.stride_ = 0;
	}

	mesh & mesh::operator =(mesh && other)
	{
		if (this == &other) return *this;

		if (array_)
		{
			gl::DeleteVertexArrays(1, &array_);
			gl::DeleteBuffers(1, &buffer_);
		}

		array_ = other.array_;
		buffer_ = other.buffer_;
		count_ = other.count_;
		stride_ = other.stride_;
		primitive_type_ = other.primitive_type_;

		other.array_ = 0;
		other.buffer_ = 0;
		other.count_ = 0;
		other.stride_ = 0;

		return *this;
	}

	mesh::~mesh()
	{
		gl::DeleteVertexArrays(1, &array_);
		gl::DeleteBuffers(1, &buffer_);
	}

	mesh::mesh(int)
	{
		array_ = 0;
		buffer_ = 0;
	}

	indexed_mesh indexed_mesh::null()
	{
		return indexed_mesh(0);
	}

	indexed_mesh::indexed_mesh()
	{
		gl::GenVertexArrays(1, &array_);
		gl::GenBuffers(1, &buffer_);
		gl::GenBuffers(1, &index_buffer_);
	}

	indexed_mesh::indexed_mesh(indexed_mesh && other)
	{
		array_ = other.array_;
		buffer_ = other.buffer_;
		index_buffer_ = other.index_buffer_;
		count_ = other.count_;
		index_type_ = other.index_type_;
		stride_ = other.stride_;
		primitive_type_ = other.primitive_type_;

		other.array_ = 0;
		other.buffer_ = 0;
		other.index_buffer_ = 0;
		other.count_ = 0;
		other.index_type_ = 0;
		other.stride_ = 0;
	}

	indexed_mesh & indexed_mesh::operator =(indexed_mesh && other)
	{
		if (this == &other) return *this;

		if (array_)
		{
			gl::DeleteVertexArrays(1, &array_);
			gl::DeleteBuffers(1, &buffer_);
			gl::DeleteBuffers(1, &index_buffer_);
		}

		array_ = other.array_;
		buffer_ = other.buffer_;
		index_buffer_ = other.index_buffer_;
		count_ = other.count_;
		index_type_ = other.index_type_;
		stride_ = other.stride_;
		primitive_type_ = other.primitive_type_;

		other.array_ = 0;
		other.buffer_ = 0;
		other.index_buffer_ = 0;
		other.count_ = 0;
		other.index_type_ = 0;
		other.stride_ = 0;

		return *this;
	}

	indexed_mesh::~indexed_mesh()
	{
		gl::DeleteVertexArrays(1, &array_);
		gl::DeleteBuffers(1, &buffer_);
		gl::DeleteBuffers(1, &index_buffer_);
	}

	indexed_mesh::indexed_mesh(int)
	{
		array_ = 0;
		buffer_ = 0;
		index_buffer_ = 0;
	}

	instanced_mesh instanced_mesh::null()
	{
		return instanced_mesh(0);
	}

	instanced_mesh::instanced_mesh()
	{
		gl::GenVertexArrays(1, &array_);
		gl::GenBuffers(1, &buffer_);
		gl::GenBuffers(1, &instance_buffer_);
	}

	instanced_mesh::instanced_mesh(instanced_mesh && other)
	{
		array_ = other.array_;
		buffer_ = other.buffer_;
		instance_buffer_ = other.instance_buffer_;
		count_ = other.count_;
		instance_count_ = other.instance_count_;
		stride_ = other.stride_;
		instance_stride_ = other.instance_stride_;
		primitive_type_ = other.primitive_type_;

		other.array_ = 0;
		other.buffer_ = 0;
		other.instance_buffer_ = 0;
		other.count_ = 0;
		other.instance_count_ = 0;
		other.stride_ = 0;
		other.instance_stride_ = 0;
	}

	instanced_mesh & instanced_mesh::operator = (instanced_mesh && other)
	{
		if (this == &other)
			return *this;

		gl::DeleteVertexArrays(1, &array_);
		gl::DeleteBuffers(1, &buffer_);
		gl::DeleteBuffers(1, &instance_buffer_);

		array_ = other.array_;
		buffer_ = other.buffer_;
		instance_buffer_ = other.instance_buffer_;
		count_ = other.count_;
		instance_count_ = other.instance_count_;
		stride_ = other.stride_;
		instance_stride_ = other.instance_stride_;
		primitive_type_ = other.primitive_type_;

		other.array_ = 0;
		other.buffer_ = 0;
		other.instance_buffer_ = 0;
		other.count_ = 0;
		other.instance_count_ = 0;
		other.stride_ = 0;
		other.instance_stride_ = 0;

		return *this;
	}

	instanced_mesh::~instanced_mesh()
	{
		gl::DeleteVertexArrays(1, &array_);
		gl::DeleteBuffers(1, &buffer_);
		gl::DeleteBuffers(1, &instance_buffer_);
	}

	instanced_mesh::instanced_mesh(int)
	{
		array_ = 0;
		buffer_ = 0;
		instance_buffer_ = 0;
	}

	instanced_indexed_mesh instanced_indexed_mesh::null()
	{
		return instanced_indexed_mesh(0);
	}

	instanced_indexed_mesh::instanced_indexed_mesh()
	{
		gl::GenVertexArrays(1, &array_);
		gl::GenBuffers(1, &buffer_);
		gl::GenBuffers(1, &index_buffer_);
		gl::GenBuffers(1, &instance_buffer_);
	}

	instanced_indexed_mesh::instanced_indexed_mesh(instanced_indexed_mesh && other)
	{
		array_ = other.array_;
		buffer_ = other.buffer_;
		instance_buffer_ = other.instance_buffer_;
		count_ = other.count_;
		instance_count_ = other.instance_count_;
		stride_ = other.stride_;
		instance_stride_ = other.instance_stride_;
		primitive_type_ = other.primitive_type_;

		other.array_ = 0;
		other.buffer_ = 0;
		other.instance_buffer_ = 0;
		other.count_ = 0;
		other.instance_count_ = 0;
		other.stride_ = 0;
		other.instance_stride_ = 0;
	}

	instanced_indexed_mesh & instanced_indexed_mesh::operator = (instanced_indexed_mesh && other)
	{
		if (this == &other)
			return *this;

		gl::DeleteVertexArrays(1, &array_);
		gl::DeleteBuffers(1, &buffer_);
		gl::DeleteBuffers(1, &index_buffer_);
		gl::DeleteBuffers(1, &instance_buffer_);

		array_ = other.array_;
		buffer_ = other.buffer_;
		instance_buffer_ = other.instance_buffer_;
		count_ = other.count_;
		instance_count_ = other.instance_count_;
		stride_ = other.stride_;
		instance_stride_ = other.instance_stride_;
		primitive_type_ = other.primitive_type_;

		other.array_ = 0;
		other.buffer_ = 0;
		other.instance_buffer_ = 0;
		other.count_ = 0;
		other.instance_count_ = 0;
		other.stride_ = 0;
		other.instance_stride_ = 0;

		return *this;
	}

	instanced_indexed_mesh::~instanced_indexed_mesh()
	{
		gl::DeleteVertexArrays(1, &array_);
		gl::DeleteBuffers(1, &buffer_);
		gl::DeleteBuffers(1, &index_buffer_);
		gl::DeleteBuffers(1, &instance_buffer_);
	}

	instanced_indexed_mesh::instanced_indexed_mesh(int)
	{
		array_ = 0;
		buffer_ = 0;
		index_buffer_ = 0;
		instance_buffer_ = 0;
	}

}