#include <OgreRenderWindow.h>
#include <OgreRoot.h>
#include <OIS.h>

#include "core/CameraManager.h"
#include "core/CameraManagerCommands.h"
#include "common/QGearsApplication.h"
#include "core/ConfigVar.h"
#include "core/InputManager.h"
#include "core/Logger.h"


ConfigVar cv_cam_speed("camera_speed", "Camera speed", "0.02");
template<>CameraManager* Ogre::Singleton<CameraManager>::msSingleton = nullptr;


CameraManager::CameraManager():
    m_CameraFree(false),
    m_CameraFreeRotate(false),

    m_2DPosition(Ogre::Vector3::ZERO),
    m_2DOrientation(Ogre::Quaternion::ZERO),
    m_2DFOV(0),
    m_2DScroll(Ogre::Vector2::ZERO)
{
    LOG_TRIVIAL("CameraManager started.");

    InitCommands();

    m_Camera = Ogre::Root::getSingleton().getSceneManager("Scene")->createCamera("Camera");
    m_Camera->setNearClipDistance(0.001f);
    m_Camera->setFarClipDistance(1000.0f);
    m_Camera->setPosition(Ogre::Vector3(0, 0, 0));
    m_Camera->lookAt(Ogre::Vector3(0, 0, 0));
    m_Viewport = QGears::Application::getSingleton().getRenderWindow()->addViewport(m_Camera, 0);
    m_Viewport->setBackgroundColour(Ogre::ColourValue(0, 0, 0));
    m_Camera->setAspectRatio(Ogre::Real(m_Viewport->getActualWidth()) / Ogre::Real(m_Viewport->getActualHeight()));
}


CameraManager::~CameraManager()
{
    LOG_TRIVIAL("CameraManager finished.");
}


void
CameraManager::Input(const QGears::Event& event, Ogre::Real timeSinceLastFrame)
{
    if(m_CameraFree == true)
    {
        float speed = cv_cam_speed.GetF() * timeSinceLastFrame;
        if(InputManager::getSingleton().IsButtonPressed(OIS::KC_RSHIFT)
                || InputManager::getSingleton().IsButtonPressed(OIS::KC_LSHIFT))
        {
            speed *= 4;
        }

        if (event.type == QGears::ET_KEY_IMPULSE && event.param1 == OIS::KC_W)
        {
            m_Camera->moveRelative(Ogre::Vector3(0, 0, -speed));
        }
        else if (event.type == QGears::ET_KEY_IMPULSE
                 && event.param1 == OIS::KC_A)
        {
            m_Camera->moveRelative(Ogre::Vector3(-speed, 0, 0));
        }
        else if (event.type == QGears::ET_KEY_IMPULSE
                 && event.param1 == OIS::KC_S)
        {
            m_Camera->moveRelative(Ogre::Vector3(0, 0, speed));
        }
        else if (event.type == QGears::ET_KEY_IMPULSE
                 && event.param1 == OIS::KC_D)
        {
            m_Camera->moveRelative(Ogre::Vector3(speed, 0, 0));
        }
        else if (event.type == QGears::ET_MOUSE_PRESS
                 && event.param1 == OIS::MB_Right)
        {
            m_CameraFreeRotate = true;
        }
        else if (event.type == QGears::ET_MOUSE_RELEASE
                 && event.param1 == OIS::MB_Right)
        {
            m_CameraFreeRotate = false;
        }
        else if (event.type == QGears::ET_MOUSE_MOVE
                 && m_CameraFreeRotate == true)
        {
            m_Camera->rotate(Ogre::Vector3::UNIT_Z,
                             Ogre::Radian(Ogre::Degree(-event.param1 * 0.13f)));
            m_Camera->pitch(Ogre::Degree(-event.param2 * 0.13f));
        }
    }
}


void
CameraManager::Update()
{
}


void
CameraManager::OnResize()
{
    m_Camera->setAspectRatio(Ogre::Real(m_Viewport->getActualWidth())
                             / Ogre::Real(m_Viewport->getActualHeight()));
}


void
CameraManager::SetCameraFree(const bool enable)
{
    m_CameraFree = enable;

    if(m_CameraFree == true)
    {
        m_Camera->resetFrustumExtents();
        CameraManager::getSingleton().GetCurrentCamera()->setFOVy(Ogre::Radian(Ogre::Math::PI / 4.0f));
    }
    else
    {
        CameraManager::getSingleton().GetCurrentCamera()->setPosition(m_2DPosition);
        CameraManager::getSingleton().GetCurrentCamera()->setOrientation(m_2DOrientation);
        CameraManager::getSingleton().GetCurrentCamera()->setFOVy(m_2DFOV);
        Set2DScroll(Get2DScroll());
    }
}


void
CameraManager::Set2DCamera(const Ogre::Vector3 position, const Ogre::Quaternion orientation, const Ogre::Radian fov)
{
    m_2DPosition = position;
    m_2DOrientation = orientation;
    m_2DFOV = fov;
    CameraManager::getSingleton().GetCurrentCamera()->setPosition(m_2DPosition);
    CameraManager::getSingleton().GetCurrentCamera()->setOrientation(m_2DOrientation);
    CameraManager::getSingleton().GetCurrentCamera()->setFOVy(m_2DFOV);
    Set2DScroll(Ogre::Vector2::ZERO);
}


void
CameraManager::Set2DScroll(const Ogre::Vector2& position)
{
    m_2DScroll = position;

    if(m_CameraFree == true)
    {
        return;
    }

    float width = static_cast<float>(m_Viewport->getActualWidth());
    float height = static_cast<float>(m_Viewport->getActualHeight());
    float left, right, top, bottom;
    m_Camera->resetFrustumExtents();
    m_Camera->getFrustumExtents(left, right, top, bottom);
    float move_x = ((right - left) / width) * position.x;
    float move_y = ((bottom - top) / height) * -position.y;
    m_Camera->setFrustumExtents(left - move_x, right - move_x,
                                top + move_y, bottom + move_y);
}


const Ogre::Vector2&
CameraManager::Get2DScroll() const
{
    return m_2DScroll;
}


const Ogre::Vector3
CameraManager::ProjectPointToScreen(const Ogre::Vector3& point)
{
    Ogre::Vector3 view = m_Camera->getViewMatrix() * point;
    float z = view.z;
    view = m_Camera->getProjectionMatrix() * view;
    view.z = z;

    float width = static_cast<float>(m_Viewport->getActualWidth() / 2);
    float height = static_cast<float>(m_Viewport->getActualHeight() / 2);

    view.x = width + view.x * width;
    view.y = height - view.y * height;

    return view;
}


Ogre::Camera*
CameraManager::GetCurrentCamera()
{
    return m_Camera;
}


Ogre::Viewport*
CameraManager::getViewport()
{
    return m_Viewport;
}


void CameraManager::EnableWireFrame(bool)
{
    if (m_Camera)
    {
        //m_Camera->setPolygonMode(Ogre::PM_WIREFRAME);
        //    m_Camera->rotate( Ogre::Vector3::UNIT_Z, Ogre::Radian( Ogre::Degree( 180 ) ) );
        m_Camera->setFarClipDistance(900000000);
    }
}