// Copyright (C) 2012-2013 ChaosForge / Kornel Kisielewicz
// http://chaosforge.org/
//
// This file is part of NV Libraries.
// For conditions of distribution and use, see copyright notice in nv.hh
/**
 * @file device.hh
 * @author Kornel Kisielewicz epyon@chaosforge.org
 * @brief Device class
 */

#ifndef NV_DEVICE_HH
#define NV_DEVICE_HH

#include <nv/common.hh>
#include <nv/string.hh>
#include <nv/interface/mesh.hh>
#include <nv/interface/vertex_buffer.hh>
#include <nv/interface/texture2d.hh>
#include <nv/interface/image_data.hh>

namespace nv
{
	class window;
	class program;

	class device
	{
	public:
		virtual window* create_window( uint16 width, uint16 height, bool fullscreen ) = 0;
		virtual program* create_program( const string& vs_source, const string& fs_source ) = 0;
		virtual vertex_buffer* create_vertex_buffer( buffer_hint hint, size_t size, const void* source = nullptr ) = 0;
		virtual index_buffer* create_index_buffer( buffer_hint hint, size_t size, const void* source = nullptr ) = 0;
		virtual vertex_array* create_vertex_array() = 0;
		virtual image_data* create_image_data( const std::string& filename ) = 0; // temporary
		virtual texture2d* create_texture2d( ivec2 size, image_format aformat, datatype adatatype, sampler asampler, void* data = nullptr ) = 0;
		virtual uint32 get_ticks() = 0;
		virtual void delay( uint32 ms ) = 0;

		virtual vertex_array* create_vertex_array( const mesh_pack* m, const attribute_map* am, buffer_hint hint )
		{
			vertex_array* result = create_vertex_array();
			for ( auto& attr : m->get_attributes() )
			{
				// TODO : error checking
				vertex_buffer* vb = create_vertex_buffer( hint, attr.second->get_size(), attr.second->get_data() );
				result->add_vertex_buffer( am->at( attr.first )->get_location(), vb, attr.second->get_base_type(), attr.second->get_components() );
			}
			if ( m->has_indices() )
			{
				const vertex_attribute_base* i = m->get_indices();
				index_buffer* vb = create_index_buffer( hint, i->get_size(), i->get_data() );
				result->set_index_buffer( vb, i->get_base_type(), true );
			}
			return result;
		}

		template < typename VTX, slot SLOT >
		void add_vertex_buffer_impl( vertex_array*, vertex_buffer*, const std::false_type& )
		{
		}

		template < typename VTX, slot SLOT >
		void add_vertex_buffer_impl( vertex_array* va, vertex_buffer* vb, const std::true_type& )
		{
			typedef vertex_slot_info< VTX, SLOT > vinfo;
			typedef datatype_traits< typename vinfo::value_type > dt_traits;
			va->add_vertex_buffer( SLOT, vb, type_to_enum< dt_traits::base_type >::type, dt_traits::size, vinfo::offset, sizeof( VTX ), false );
		}

		template < typename VTX, slot SLOT >
		void add_vertex_buffer( vertex_array* va, vertex_buffer* vb )
		{
			add_vertex_buffer_impl< VTX, SLOT >( va, vb, std::integral_constant< bool, vertex_has_slot< VTX, SLOT >::value >() );
		}


		template < typename VTX >
		vertex_array* create_vertex_array( const VTX* v, size_t count, buffer_hint hint )
		{
			vertex_array*  va = create_vertex_array();
			vertex_buffer* vb = create_vertex_buffer( hint, count * sizeof( VTX ), v );
			add_vertex_buffer< VTX, slot::POSITION >  ( va, vb );
			add_vertex_buffer< VTX, slot::TEXCOORD >  ( va, vb );
			add_vertex_buffer< VTX, slot::NORMAL   >  ( va, vb );
			add_vertex_buffer< VTX, slot::TANGENT >   ( va, vb );
			add_vertex_buffer< VTX, slot::BONEINDEX > ( va, vb );
			add_vertex_buffer< VTX, slot::BONEWEIGHT >( va, vb );
			add_vertex_buffer< VTX, slot::COLOR >     ( va, vb );
			return va;
		}

		template < typename VTX >
		vertex_array* create_vertex_array( const std::vector< VTX >& data, buffer_hint hint )
		{
			return create_vertex_array( data.data(), data.size(), hint );
		}

		template < typename VTX, typename IDX >
		vertex_array* create_vertex_array( const VTX* v, size_t vcount, const IDX* i, size_t icount, buffer_hint hint )
		{
			vertex_array* va = create_vertex_array( v, vcount, hint );
			index_buffer* ib = create_index_buffer( hint, icount * sizeof( IDX ), i );
			va->set_index_buffer( ib, type_to_enum< IDX >::type, true );
			return va;
		}

		template < typename VTX, typename IDX >
		vertex_array* create_vertex_array( const std::vector< VTX >& data, const std::vector< IDX >& idata, buffer_hint hint )
		{
			return create_vertex_array( data.data(), data.size(), idata.data(), idata.size(), hint );
		}

		virtual ~device() {}
	};

} // namespace nv


#endif // NV_DEVICE_HH