/*
 * 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.
 *
 */

// CLASS HEADER
#include "model-pbr.h"

// EXTERNAL INCLUDES
#include <dali/devel-api/adaptor-framework/file-loader.h>
#include <string.h>
#include <cstdio>

// INTERNAL INCLUDES
#include "obj-loader.h"

namespace
{
const int SEGMENTS = 16;

struct Vertices
{
  Vector<Vector3> positions;
  Vector<Vector3> normals;
  Vector<Vector3> tangents;
  Vector<Vector2> texCoords;
};

} // namespace

ModelPbr::ModelPbr()
{
}

ModelPbr::~ModelPbr()
{
}

void ModelPbr::Init(Shader shader, const std::string& modelUrl, const Vector3& position, const Vector3& size)
{
  Geometry geometry;

  geometry = CreateGeometry(modelUrl);

  Renderer renderer = Renderer::New(geometry, shader);

  if(mTextureSet)
  {
    renderer.SetTextures(mTextureSet);
  }

  // Face culling is enabled to hide the backwards facing sides of the model
  // This is sufficient to render a single object; for more complex scenes depth-testing might be required
  renderer.SetProperty(Renderer::Property::DEPTH_TEST_MODE, DepthTestMode::ON);
  renderer.SetProperty(Renderer::Property::DEPTH_WRITE_MODE, DepthWriteMode::ON);
  renderer.SetProperty(Renderer::Property::DEPTH_FUNCTION, DepthFunction::LESS_EQUAL);
  renderer.SetProperty(Renderer::Property::FACE_CULLING_MODE, FaceCullingMode::BACK);

  mActor = Actor::New();
  mActor.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::CENTER);
  mActor.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER);
  mActor.SetProperty(Actor::Property::POSITION, position);
  mActor.SetProperty(Actor::Property::SIZE, size);
  mActor.AddRenderer(renderer);
}

/**
 * Set texture and sampler
 */
void ModelPbr::InitTexture(Texture albedoM, Texture normalR, Texture texDiffuse, Texture texSpecular)
{
  mTextureSet = TextureSet::New();
  mTextureSet.SetTexture(0u, albedoM);
  mTextureSet.SetTexture(1u, normalR);
  mTextureSet.SetTexture(2u, texDiffuse);
  mTextureSet.SetTexture(3u, texSpecular);

  Sampler sampler = Sampler::New();
  sampler.SetWrapMode(WrapMode::CLAMP_TO_EDGE, WrapMode::CLAMP_TO_EDGE, WrapMode::CLAMP_TO_EDGE);
  sampler.SetFilterMode(FilterMode::LINEAR_MIPMAP_LINEAR, FilterMode::LINEAR);
  mTextureSet.SetSampler(3, sampler);
}

Actor& ModelPbr::GetActor()
{
  return mActor;
}

/**
 * Create geometry from OBJ path file
 */
Geometry ModelPbr::CreateGeometry(const std::string& url)
{
  std::streampos     fileSize;
  Dali::Vector<char> fileContent;

  Geometry geometry;

  if(FileLoader::ReadFile(url, fileSize, fileContent, FileLoader::TEXT))
  {
    PbrDemo::ObjLoader objLoader;

    objLoader.ClearArrays();
    objLoader.LoadObject(fileContent.Begin(), fileSize);

    geometry = objLoader.CreateGeometry(PbrDemo::ObjLoader::TEXTURE_COORDINATES | PbrDemo::ObjLoader::TANGENTS, true);
  }

  return geometry;
}