// Copyright (C) 2014 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

#include "nv/formats/nmd_loader.hh"
#include "nv/io/std_stream.hh"
#include "nv/string.hh"

using namespace nv;

bool nv::nmd_loader::load( stream& source )
{
	// TODO: proper error handling
	reset();
	nmd_header root_header;
	source.read( &root_header, sizeof( root_header ), 1 );
	for ( uint32 i = 0; i < root_header.elements; ++i )
	{
		nmd_element_header element_header;
		source.read( &element_header, sizeof( element_header ), 1 );
		switch ( element_header.type )
		{
		case nmd_type::MESH           : load_mesh( source, element_header ); break;
		case nmd_type::ANIMATION      : load_animation( source, element_header ); break;
		case nmd_type::STRING_TABLE   : load_strings( source ); break;
		default: NV_ASSERT( false, "UNKNOWN NMD ELEMENT!" ); break;
		}
	}
	return true;
}

bool nv::nmd_loader::load_mesh( stream& source, const nmd_element_header& e )
{
	mesh_data* mesh = new mesh_data();
	for ( uint32 s = 0; s < e.children; ++s )
	{
		nmd_element_header element_header;
		source.read( &element_header, sizeof( element_header ), 1 );
		NV_ASSERT( element_header.type == nmd_type::STREAM, "STREAM expected!" );

		nmd_stream_header stream_header;
		source.read( &stream_header, sizeof( stream_header ), 1 );
		mesh_raw_channel* channel = mesh_raw_channel::create( stream_header.format, stream_header.count );
		source.read( channel->data, stream_header.format.size, stream_header.count );
		mesh->add_channel( channel );
	}
	m_mesh_names.push_back( e.name );
	m_meshes.push_back( mesh );
	return true;
}

mesh_data* nv::nmd_loader::release_mesh_data( size_t index )
{
	mesh_data* result = m_meshes[ index ];
	if ( m_strings ) result->set_name( m_strings->get( m_mesh_names[ index ] ) );
	m_meshes[ index ] = nullptr;
	return result;
}

mesh_data_pack* nv::nmd_loader::release_mesh_data_pack()
{
	uint32 size = m_meshes.size();
	mesh_data* meshes = new mesh_data[ size ];
	for ( uint32 i = 0; i < size; ++i )
	{
		m_meshes[i]->move_to( meshes[i] );
		delete m_meshes[i];
	}
	m_meshes.clear();
	return new mesh_data_pack( size, meshes, release_mesh_nodes_data() );
}

void nv::nmd_loader::reset()
{
	for ( auto mesh : m_meshes ) if ( mesh ) delete mesh;
	if ( m_strings )   delete m_strings;
	if ( m_node_data ) delete m_node_data;
	m_meshes.clear();
	m_mesh_names.clear();
	m_node_names.clear();

	m_node_data  = nullptr;
	m_node_array = nullptr;
	m_strings    = nullptr;
}

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

bool nv::nmd_loader::load_strings( stream& source )
{
	NV_ASSERT( m_strings == nullptr, "MULTIPLE STRING ENTRIES!" );
	m_strings = new string_table( &source );
	return true;
}

bool nv::nmd_loader::load_animation( stream& source, const nmd_element_header& e )
{
	NV_ASSERT( m_node_data == nullptr, "MULTIPLE NODE ENTRIES!" );
	nmd_animation_header animation_header;
	source.read( &animation_header, sizeof( animation_header ), 1 );
	m_node_array = new mesh_node_data[ e.children ];
	for ( uint32 i = 0; i < e.children; ++i )
	{
		nmd_element_header element_header;
		source.read( &element_header, sizeof( element_header ), 1 );
		NV_ASSERT( element_header.type == nmd_type::NODE, "NODE expected!" );
		m_node_names.push_back( element_header.name );
		uint16 ch_count = element_header.children;

		nmd_node_header node_header;
		source.read( &node_header, sizeof( node_header ), 1 );
		m_node_array[i].parent_id     = node_header.parent_id;
		m_node_array[i].transform     = node_header.transform;
		m_node_array[i].data          = nullptr;
		if ( ch_count > 0 )
		{
			key_data* kdata = new key_data;
			m_node_array[i].data = kdata;
			for ( uint32 c = 0; c < ch_count; ++c )
			{
				source.read( &element_header, sizeof( element_header ), 1 );
				NV_ASSERT( element_header.type == nmd_type::KEY_CHANNEL, "CHANNEL expected!" );
				nv::nmd_key_channel_header cheader;
				source.read( &cheader, sizeof( cheader ), 1 );
				key_raw_channel* channel = key_raw_channel::create( cheader.format, cheader.count );
				source.read( channel->data, channel->desc.size, channel->count );
				kdata->add_channel( channel );
			}
		}
	}
	m_node_data = new mesh_nodes_data( "animation", e.children, m_node_array, animation_header.frame_rate, animation_header.duration, animation_header.flat );
	return true;
}

mesh_nodes_data* nv::nmd_loader::release_mesh_nodes_data()
{
	if ( m_node_data )
	{
		if ( m_strings )
		{
			for ( uint32 i = 0; i < m_node_data->get_count(); ++i )
			{
				m_node_array[i].name = m_strings->get( m_node_names[i] );
			}
		}
		mesh_nodes_data* result = m_node_data;
		m_node_data = nullptr;
		m_node_array = nullptr;
		return result;
	}
	return nullptr;
}

// TEMPORARY

nv::nmd_temp_model_data::nmd_temp_model_data( nmd_loader* loader )
{
	for ( unsigned m = 0; m < loader->get_mesh_count(); ++m )
	{
		m_mesh_data.push_back(loader->release_mesh_data(m));
	}
	m_node_data = loader->release_mesh_nodes_data();
}

nv::nmd_temp_model_data::~nmd_temp_model_data()
{
	for ( unsigned m = 0; m < m_mesh_data.size(); ++m )
	{
		delete m_mesh_data[m];
	}
	delete m_node_data;
}