/*
 * Copyright (c) 2020 Samsung Electronics Co., Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

#include "game-model.h"
#include "game-utils.h"

using namespace GameUtils;

namespace
{
// 'MODV' tag stored in the big-endian (network) order
const uint32_t MODV_TAG(0x4D4F4456);
} // namespace

GameModel::GameModel(const char* filename)
: mUniqueId(false),
  mIsReady(false)
{
  ByteArray bytes;
  if(!LoadFile(filename, bytes))
  {
    return;
  }

  mHeader = *(reinterpret_cast<ModelHeader*>(bytes.data()));

  // expect big-endian
  if(MODV_TAG != mHeader.tag)
  {
    // jump to little-endian variant
    mHeader = *(reinterpret_cast<ModelHeader*>(bytes.data() + bytes.size() / 2));
  }

  mVertexBuffer = Dali::VertexBuffer::New(Dali::Property::Map().Add("aPosition", Dali::Property::VECTOR3).Add("aNormal", Dali::Property::VECTOR3).Add("aTexCoord", Dali::Property::VECTOR2));

  mVertexBuffer.SetData(bytes.data() + mHeader.dataBeginOffset, mHeader.vertexBufferSize / mHeader.vertexStride);

  mGeometry = Dali::Geometry::New();
  mGeometry.AddVertexBuffer(mVertexBuffer);
  mGeometry.SetType(Dali::Geometry::TRIANGLES);

  mUniqueId = HashString(filename);

  mIsReady = true;
}

GameModel::~GameModel()
{
}

Dali::Geometry& GameModel::GetGeometry()
{
  return mGeometry;
}

bool GameModel::IsReady()
{
  return mIsReady;
}

uint32_t GameModel::GetUniqueId()
{
  return mUniqueId;
}