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

   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 "imstkVisualTestingUtils.h"
#include "imstkKeyboardDeviceClient.h"
#include "imstkKeyboardSceneControl.h"
#include "imstkLogger.h"
#include "imstkMouseSceneControl.h"
#include "imstkScene.h"
#include "imstkSceneManager.h"
#include "imstkSimulationManager.h"
#include "imstkTestingUtils.h"
#include "imstkVTKTextStatusManager.h"
#include "imstkVTKViewer.h"

using namespace imstk;

void
VisualTest::SetUp()
{
    if (m_useStdOut)
    {
        Logger::getInstance().addStdoutSink();
    }
    // Constructed early so user can subscribe calls to them
    m_driver       = std::make_shared<SimulationManager>();
    m_sceneManager = std::make_shared<SceneManager>();
    m_viewer       = std::make_shared<VTKViewer>();
}

void
VisualTest::TearDown()
{
    Logger::getInstance().destroy();
}

void
VisualTest::runFor(const double duration, const double fixedTimestep)
{
    m_duration = duration;

    // Setup a viewer to render
    m_viewer->setActiveScene(m_scene);
    m_viewer->setVtkLoggerMode(VTKViewer::VTKLoggerMode::MUTE);
    m_viewer->setDebugAxesLength(0.05, 0.05, 0.05);
    m_viewer->setWindowTitle(m_scene->getName());

    // Setup a scene manager to advance the scene
    m_sceneManager->setActiveScene(m_scene);

    m_driver->clearModules();
    m_driver->requestStatus(ModuleDriverRunning);
    m_driver->addModule(m_viewer);
    m_driver->addModule(m_sceneManager);

    // For stopping the timer
    connect<KeyEvent>(m_viewer->getKeyboardDevice(), &KeyboardDeviceClient::keyPress,
        [&](KeyEvent* e)
        {
            // If any key is pressed, stop the timer (stopping condition in postUpdate below)
            m_timerPaused = true;

            // If key advance is on
            if (e->m_key == '1')
            {
                m_sceneManager->setDt(0.05);
                m_sceneManager->postEvent(Event(SceneManager::preUpdate()));
                m_scene->advance(0.05);
                m_sceneManager->postEvent(Event(SceneManager::postUpdate()));
            }
            else if (e->m_key == '2')
            {
                m_sceneManager->setDt(0.01);
                m_sceneManager->postEvent(Event(SceneManager::preUpdate()));
                m_scene->advance(0.01);
                m_sceneManager->postEvent(Event(SceneManager::postUpdate()));
            }
            else if (e->m_key == '3')
            {
                m_sceneManager->setDt(0.001);
                m_sceneManager->postEvent(Event(SceneManager::preUpdate()));
                m_scene->advance(0.001);
                m_sceneManager->postEvent(Event(SceneManager::postUpdate()));
            }
        });
    connect<Event>(m_sceneManager, &SceneManager::postUpdate,
        [&](Event*)
        {
            if (m_timerPaused)
            {
                m_viewer->getTextStatusManager()->setCustomStatus("Paused at " +
                    to_string_with_precision(m_scene->getSceneTime(), 3) + 's');
            }
            else
            {
                m_viewer->getTextStatusManager()->setCustomStatus(
                    to_string_with_precision(m_scene->getSceneTime(), 3) + 's');
                if (m_duration != -1.0 && m_scene->getSceneTime() > m_duration)
                {
                    m_driver->requestStatus(ModuleDriverStopped);
                }
            }
        });
    m_viewer->getTextStatusManager()->setCustomStatus("0.000s");

    // Add mouse and keyboard controls to the viewer
    {
        auto mouseControl = std::make_shared<MouseSceneControl>(m_viewer->getMouseDevice());
        mouseControl->setSceneManager(m_sceneManager);
        m_viewer->addControl(mouseControl);

        auto keyControl = std::make_shared<KeyboardSceneControl>(m_viewer->getKeyboardDevice());
        keyControl->setSceneManager(m_sceneManager);
        keyControl->setModuleDriver(m_driver);
        m_viewer->addControl(keyControl);
    }

    m_dt = fixedTimestep;
    m_driver->setDesiredDt(m_dt);
    m_driver->start();
}
