// Copyright (C) 2014-2017 ChaosForge Ltd
// http://chaosforge.org/
//
// This file is part of Nova libraries. 
// For conditions of distribution and use, see copying.txt file in root folder.

#include "nv/formats/ndfm_loader.hh"
#include "nv/interface/data_channel_access.hh"
#include "nv/stl/string.hh"

using namespace nv;

#if 0

bool nv::ndfm_loader::load( stream& source )
{
	// TODO: proper error handling
	reset();
	ndf_header header;
	source.read( &header, sizeof( header ), 1 );

	ndf_element root_header;
	source.read( &root_header, sizeof( root_header ), 1 );
	skip_attributes( source, root_header.attributes );
	for ( uint32 i = 0; i < root_header.children; ++i )
	{
		ndf_element element_header;
		source.read( &element_header, sizeof( element_header ), 1 );
		skip_attributes( source, element_header.attributes );
		if ( element_header.type == "mesh"_sh64 )
			load_mesh( source, element_header );
		else if ( element_header.type == "animation"_sh64 )
			load_animation( source, element_header );
		else if ( element_header.type == "strings"_sh64 )
			load_strings( source ); 
		else NV_ASSERT( false, "UNKNOWN NMD ELEMENT!" );
	}
	return true;
}

bool nv::ndfm_loader::load_mesh( stream& source, const ndf_element& e )
{
	data_channel_set* mesh = data_channel_set_creator::create_set( e.children );
	load_channel_set( source, mesh, e );
	m_meshes.push_back( mesh );
	return true;
}

data_channel_set* nv::ndfm_loader::release_mesh_data( uint32 index )
{
	data_channel_set* result = m_meshes[index];
	m_meshes[index] = nullptr;
	return result;
}

void nv::ndfm_loader::reset()
{
	for ( auto mesh : m_meshes ) if ( mesh ) delete mesh;
	if ( m_node_data ) delete m_node_data;
	m_meshes.clear();

	m_node_data = nullptr;
}

void nv::ndfm_loader::skip_attributes( stream& source, uint32 count )
{
	if ( count == 0 ) return;
	source.seek( count * sizeof( ndf_attribute ), origin::CUR );
}

nv::ndfm_loader::~ndfm_loader()
{
	reset();
}

bool nv::ndfm_loader::load_strings( stream& source )
{
	if ( !m_strings ) return true;
	// TODO: load strings optionally
	string_table* strings = new string_table( source );
	m_strings->insert( strings );
	delete strings;
	return true;
}

bool nv::ndfm_loader::load_animation( stream& source, const ndf_element& e )
{
	NV_ASSERT( m_node_data == nullptr, "MULTIPLE NODE ENTRIES!" );
	ndfm_animation_data animation_header;
	source.read( &animation_header, sizeof( animation_header ), 1 );
	m_node_data = new mesh_nodes_data( e.name, animation_header.frame_rate, animation_header.frame_count, animation_header.flat );
	for ( uint32 i = 0; i < e.children; ++i )
	{
		ndf_element element_header;
		source.read( &element_header, sizeof( element_header ), 1 );
		skip_attributes( source, element_header.attributes );
		NV_ASSERT( element_header.type == "node"_sh64, "NODE expected!" );
		data_channel_set* set = data_channel_set_creator::create_set( element_header.children );
		load_channel_set( source, set, element_header );
		m_node_data->append( set );
	}
	m_node_data->initialize();
	return true;
}

bool nv::ndfm_loader::load_channel( stream& source, data_channel_set* channel_set )
{
	data_channel_set_creator kaccess( channel_set );
	ndfm_channel_header cheader;
	source.read( &cheader, sizeof( cheader ), 1 );
	raw_data_channel_access channel( kaccess.add_channel( cheader.format, cheader.count ) );
	source.read( channel.raw_data(), channel.element_size(), channel.size() );
	return true;
}

bool nv::ndfm_loader::load_channel_set( stream& source, data_channel_set* channel_set, const ndf_element& e )
{
	ndfm_node_data nheader;
	source.read( &nheader, sizeof( nheader ), 1 );

	data_channel_set_creator kaccess( channel_set );
	for ( uint32 c = 0; c < e.children; ++c )
	{
		load_channel( source, channel_set );
	}
	data_channel_set_creator access( channel_set );
	access.set_name( e.name );
	access.set_parent_id( nheader.parent_id );
	access.set_transform( nheader.transform );
	return true;
}

mesh_nodes_data* nv::ndfm_loader::release_mesh_nodes_data( uint32 )
{
	mesh_nodes_data* result = m_node_data;
	m_node_data = nullptr;
	return result;
}

data_node_list* nv::ndfm_loader::release_data_node_list( uint32 /*= 0 */ )
{
	if ( !m_node_data ) return nullptr;
	data_node_list* result = new data_node_list( m_node_data->get_name() );
	for ( auto node : *m_node_data )
		result->append( node->get_info() );
	delete m_node_data;
	m_node_data = nullptr;
	return result;
}

bool nv::ndfm_loader::is_animated( uint32 /*= 0 */ )
{
	if ( !m_node_data ) return false;
	return m_node_data->is_animated();
}



// ----------------------------------------------------------------
// nmd format dump
// HACK : TEMPORARY - will go to it's own file, probably nmd_io


void nv::ndfm_dump_header( stream& stream_out, uint16 elements, shash64 name )
{
	ndf_header header;
	header.id = four_cc<'n', 'd', 'f', '1'>::value;
	header.version = 1;
	stream_out.write( &header, sizeof( header ), 1 );

	ndf_element eheader;
	eheader.name       = name;
	eheader.type       = "model"_sh64;
	eheader.flags      = 0;
	eheader.size       = 0;
	eheader.attributes = 0;
	eheader.children   = elements;
	stream_out.write( &eheader, sizeof( eheader ), 1 );
}

void nv::ndfm_dump_element( stream& stream_out, const data_channel_set& data, shash64 type )
{
	uint32 size = sizeof( ndfm_node_data );
	for ( auto& chan : data )
	{
		size += sizeof( ndfm_channel_header );
		size += chan.raw_size();
	}

	ndf_element eheader;
	eheader.name       = data.get_name();
	eheader.type       = type;
	eheader.flags      = 0;
	eheader.size       = size;
	eheader.attributes = 0;
	eheader.children   = static_cast<uint16>( data.size() );
	stream_out.write( &eheader, sizeof( eheader ), 1 );

	ndfm_node_data nheader;
	int confirm_that_not_needed;
//	nheader.transform = data.get_transform();
	nheader.parent_id = data.get_parent_id();
	stream_out.write( &nheader, sizeof( nheader ), 1 );
	for ( auto& channel : data )
	{
		ndfm_channel_header cheader;
		cheader.format = channel.descriptor();
		cheader.count = channel.size();
		stream_out.write( &cheader, sizeof( cheader ), 1 );
		stream_out.write( channel.raw_data(), channel.element_size(), channel.size() );
	}
}

void nv::ndfm_dump_animation( stream& stream_out, const mesh_nodes_data& nodes )
{
	uint32 total = sizeof( ndfm_animation_data );
	for ( auto node : nodes )
	{
		total += sizeof( ndf_element ) + sizeof( ndfm_node_data );
		for ( uint32 c = 0; c < node->size(); ++c )
		{
			total += sizeof( ndfm_channel_header );
			total += node->get_channel( c )->raw_size();
		}
	}

	ndf_element eheader;
	eheader.name       = nodes.get_name();
	eheader.type       = "animation"_sh64;
	eheader.flags      = 0;
	eheader.size       = total;
	eheader.attributes = 0;
	eheader.children   = static_cast<uint16>( nodes.size() );
	stream_out.write( &eheader, sizeof( eheader ), 1 );

	ndfm_animation_data aheader;
	aheader.frame_rate  = nodes.get_fps();
	aheader.frame_count = nodes.get_frame_count();
	stream_out.write( &aheader, sizeof( aheader ), 1 );

	for ( auto node : nodes )
	{
		ndfm_dump_element( stream_out, *node, "node"_sh64 );
	}
}

void nv::ndfm_dump_bones( stream& stream_out, const data_node_list& bones )
{
	uint32 total = sizeof( ndfm_animation_data );
	for ( auto bone : bones )
	{
		total += sizeof( ndf_element ) + sizeof( ndfm_node_data );
	}

	ndf_element eheader;
	eheader.name = bones.get_name();
	eheader.type = "animation"_sh64;
	eheader.flags = 0;
	eheader.size = total;
	eheader.attributes = 0;
	eheader.children = static_cast<uint16>( bones.size() );
	stream_out.write( &eheader, sizeof( eheader ), 1 );

	for ( auto bone : bones )
	{
		uint32 size = sizeof( ndfm_node_data );
		ndf_element eheader;
		eheader.name = bone.name;
		eheader.type = "bone"_sh64;
		eheader.flags = 0;
		eheader.size = size;
		eheader.attributes = 0;
		eheader.children = 0;
		stream_out.write( &eheader, sizeof( eheader ), 1 );

		ndfm_node_data nheader;
		nheader.transform = bone.transform;
		nheader.parent_id = bone.parent_id;
		stream_out.write( &nheader, sizeof( nheader ), 1 );
	}
}

void nv::ndfm_dump_strings( stream& stream_out, const string_table& strings )
{
	ndf_element sheader;
	sheader.name       = shash64();
	sheader.type       = "strings"_sh64;
	sheader.flags      = 0;
	sheader.size       = strings.dump_size();
	sheader.children   = 0;
	sheader.attributes = 0;
	stream_out.write( &sheader, sizeof( sheader ), 1 );
	strings.dump( stream_out );
}

// void nv::ndfm_dump( stream& stream_out, const mesh_data_pack* model, const string_table* strings, shash64 name )
// {
// 	uint16 elements = ( strings ? 1 : 0 ) // +1 string array
// 		+ uint16( model->get_count() ) // meshes
// 		+ ( model->get_node_count() > 0 ? 1 : 0 ); // nodes
// 	ndfm_dump_header( stream_out, elements, name );
// 
// 	for ( uint32 i = 0; i < model->get_count(); ++i )
// 	{
// 		ndfm_dump_element( stream_out, *model->get_mesh( i ), "mesh"_sh64 );
// 	}
// 
// 	if ( model->get_node_count() > 0 )
// 	{
// 		ndfm_dump_nodes( stream_out, *model->get_nodes() );
// 	}
// 
// 	if ( strings )
// 	{
// 		ndfm_dump_strings( stream_out, *strings );
// 	}
// }

#endif