#include "focuscontroller.h"
#include "camera.h"
#include <glm/ext.hpp>

void FocusController::setFocus(glm::vec3* object)
{
    track = object;
    dist = glm::distance2(*track, camera->getPosition());
}

void FocusController::mouseMove(int dx, int dy)
{
    bool needUpdate = false;

    if(dist < 0)
        dist = glm::distance2(*track, camera->getPosition());

    if(grabbed & 1)
    {
        camera->rotate(glm::vec2(dx*0.01f, dy*0.01f));
        needUpdate = true;
    }

    if(grabbed & 4)
    {
        dist += dy*0.02f;
        needUpdate = true;
    }

    if(needUpdate)
        updateCamera();
}

void FocusController::mouseWheelEvent(int scrollCount)
{
    if(dist < 0)
        dist = glm::distance2(*track, camera->getPosition());

    dist += scrollCount/600.0f;
    updateCamera();
}

void FocusController::updateCamera()
{
    glm::vec2 rot = camera->getRotation();
    glm::vec3 pos = glm::vec3(std::sin(-rot.x)*std::cos(rot.y),
                    std::sin(rot.y),
                    std::cos(-rot.x)*std::cos(rot.y));
    camera->moveTo(*track + dist*pos);
}