/*=========================================================================

   Library: iMSTK

   Copyright (c) Kitware, Inc. & Center for Modeling, Simulation,
   & Imaging in Medicine, Rensselaer Polytechnic Institute.

   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.txt

   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 "imstkCamera.h"
#include "imstkCollisionDetection.h"
#include "imstkCollisionGraph.h"
#include "imstkKeyboardSceneControl.h"
#include "imstkLight.h"
#include "imstkMouseSceneControl.h"
#include "imstkNew.h"
#include "imstkObjectInteractionFactory.h"
#include "imstkSceneManager.h"
#include "imstkSPHObject.h"
#include "imstkVTKTextStatusManager.h"
#include "imstkVTKViewer.h"

#include "Fluid.hpp"
#include "Solid.hpp"

using namespace imstk;

///
/// \brief Usage: ./SPHFluid [threads=<num_threads>] [radius=<particle_radius>]
/// \brief Example: ./SPHFluid threads=8 radius=0.01
///
int
main(int argc, char* argv[])
{
    // Setup logger (write to file and stdout)
    Logger::startLogger();

    double particleRadius = 0.1;

    // Parse command line arguments
    for (int i = 1; i < argc; ++i)
    {
        auto param = std::string(argv[i]);
        if (param.find("radius") == 0
                 && param.find_first_of("=") != std::string::npos)
        {
            particleRadius = std::stod(param.substr(param.find_first_of("=") + 1));
            LOG(INFO) << "Particle radius: " << particleRadius;
        }
        else
        {
            LOG(FATAL) << "Invalid argument";
        }
    }

    // Override particle radius for scene3 because particles in this scene were pre-generated using particle radius 0.08
    if (SCENE_ID == 3)
    {
        particleRadius = 0.08;
    }

    imstkNew<Scene> scene("SPH Fluid");

    // Generate fluid and solid objects
    std::shared_ptr<SPHObject> fluidObj                  = generateFluid(particleRadius);
    std::vector<std::shared_ptr<CollidingObject>> solids = generateSolids();

    scene->addSceneObject(fluidObj);
    for (size_t i = 0; i < solids.size(); i++)
    {
        scene->addSceneObject(solids[i]);
    }

    // Collision between fluid and solid objects
    std::shared_ptr<CollisionGraph> collisionGraph = scene->getCollisionGraph();
    for (auto& solid: solids)
    {
        if (std::dynamic_pointer_cast<Plane>(solid->getCollidingGeometry()))
        {
            collisionGraph->addInteraction(makeObjectInteractionPair(fluidObj, solid,
                InteractionType::SphObjToCollidingObjCollision, CollisionDetection::Type::PointSetToPlane));
        }
        else if (std::dynamic_pointer_cast<Sphere>(solid->getCollidingGeometry()))
        {
            collisionGraph->addInteraction(makeObjectInteractionPair(fluidObj, solid,
                InteractionType::SphObjToCollidingObjCollision, CollisionDetection::Type::PointSetToSphere));
        }
        else
        {
            LOG(FATAL) << "Invalid collision object";
        }
    }

    // configure camera
    scene->getActiveCamera()->setPosition(-0.475, 8.116, -6.728);

    // configure light (white)
    imstkNew<DirectionalLight> whiteLight("whiteLight");
    whiteLight->setFocalPoint(Vec3d(5.0, -8.0, -5.0));
    whiteLight->setIntensity(1.5);
    scene->addLight(whiteLight);

    // Run the simulation
    {
        // Setup a viewer to render in its own thread
        imstkNew<VTKViewer> viewer("Viewer");
        viewer->setActiveScene(scene);
        viewer->setWindowTitle("SPH Fluid");
        viewer->setSize(1920, 1080);
        auto statusManager = viewer->getTextStatusManager();
        statusManager->setStatusFontSize(VTKTextStatusManager::StatusType::Custom, 30);
        statusManager->setStatusFontColor(VTKTextStatusManager::StatusType::Custom, Color::Red);
        connect<Event>(viewer, EventType::PostUpdate,
            [&](Event*)
            {
                statusManager->setCustomStatus("Number of particles: " +
                    std::to_string(fluidObj->getSPHModel()->getState().getNumParticles()) +
                    "\nNumber of solids: " + std::to_string(solids.size()));
            });

        // Setup a scene manager to advance the scene in its own thread
        imstkNew<SceneManager> sceneManager("Scene Manager");
        sceneManager->setActiveScene(scene);
        viewer->addChildThread(sceneManager); // SceneManager will start/stop with viewer

        // Add mouse and keyboard controls to the viewer
        {
            imstkNew<MouseSceneControl> mouseControl(viewer->getMouseDevice());
            mouseControl->setSceneManager(sceneManager);
            viewer->addControl(mouseControl);

            imstkNew<KeyboardSceneControl> keyControl(viewer->getKeyboardDevice());
            keyControl->setSceneManager(sceneManager);
            keyControl->setViewer(viewer);
            viewer->addControl(keyControl);
        }

        // Start viewer running, scene as paused
        sceneManager->requestStatus(ThreadStatus::Paused);
        viewer->start();
    }

    return 0;
}
