#include "View.h"

void View::setNewCameraPosition()
{
    vector3d<f32> newCameraPosition;
    ICameraSceneNode *camera = m_Engine->m_Scene->getActiveCamera();

    newCameraPosition.X = 0;
    newCameraPosition.Y = m_CameraDistance * sin( m_Pitch );
    newCameraPosition.Z = m_CameraDistance * cos( m_Pitch );

    matrix4 yawMatrix;
    yawMatrix.setRotationRadians( vector3df( 0, m_Yaw, 0 ));
    yawMatrix.transformVect( newCameraPosition );

    camera->setPosition( newCameraPosition );    

    // Set Light direction
    setNewLightDirection( newCameraPosition );
}

void View::setNewLightDirection( const vector3df &cameraPosition )
{
    ILightSceneNode *light = static_cast<ILightSceneNode *>( m_Engine->m_Scene->getSceneNodeFromId( SIID_LIGHT ));

    matrix4 m;
    m.buildRotateFromTo( vector3df( 0, 0, 1 ), vector3df( cameraPosition ).invert().normalize() );

    light->setRotation( m.getRotationDegrees() );
}

View::View( Engine *engine )
{
    m_Engine = engine;
    m_LastMousePosition = new vector2d<int>();
    m_RotMouse = false;

    m_Pitch = PI;

    // Set Camera Distance
    m_CameraDistance = 10;

    debug() << "Yaw: " << m_Yaw << endl;
    debug() << "Pitch: " << m_Pitch << endl;
}

View::~View()
{
    delete m_LastMousePosition;
}

// IEventReceiver
bool View::OnEvent( const SEvent &event )
{
	// If it's not a mouse event, just return unhandled
    if( event.EventType != EET_MOUSE_INPUT_EVENT )
        return false;

    const SEvent::SMouseInput *mouseEvent = &( event.MouseInput );

    if( mouseEvent->Event == EMIE_MMOUSE_PRESSED_DOWN )
    {
        m_RotMouse = true;
        m_LastMousePosition->X = mouseEvent->X;
        m_LastMousePosition->Y = mouseEvent->Y;
    }
    else if( mouseEvent->Event == EMIE_MMOUSE_LEFT_UP )
    {
        m_RotMouse = false;
    }
    else if( mouseEvent->Event == EMIE_MOUSE_WHEEL )
    {
        f32 distanceDelta = mouseEvent->Wheel / 2.5f;
        if( m_CameraDistance - distanceDelta > 0.1f )
            m_CameraDistance -= distanceDelta;

        setNewCameraPosition();
    }
    else if( m_RotMouse )
    {
        int dx = mouseEvent->X - m_LastMousePosition->X;
        int dy = mouseEvent->Y - m_LastMousePosition->Y;

        m_LastMousePosition->X = mouseEvent->X;
        m_LastMousePosition->Y = mouseEvent->Y;

        f32 pitchDelta = dy / 120.0f;
        if(( m_Pitch - pitchDelta > ( PI - ( PI / 2 ))) && ( m_Pitch - pitchDelta < PI + ( PI/2 )))
            m_Pitch -= dy / 120.0f;

        m_Yaw += dx / 120.0f;

        // Set Camera to new rotation
        setNewCameraPosition();
    }

    return true;
}