#include "svl/util/camera.h"

#include "glm/gtc/matrix_transform.hpp"

namespace svl {
namespace util {

Camera::Camera(const glm::vec2 &viewport, CameraProjectionMode mode)
{
    mViewport = viewport;
    mFieldOfView = 45.0f;
    mNearPlane = 0.01f;
    mFarPlane = 100.0f;
    mProjectionMode = mode;
}

Camera::~Camera()
{
}

void Camera::updateProjectMatrix()
{
    if (mProjectionMode == CameraProjectionMode::Perspective)
    {
        mProjectMatrix = glm::perspective(glm::radians(mFieldOfView), mViewport.x * 1.0f / mViewport.y, mNearPlane, mFarPlane);
    }
    else
    {
        mProjectMatrix = glm::ortho(-mViewport.x / 2.0f, mViewport.x / 2.0f, -mViewport.y / 2.0f, mViewport.y / 2.0f, mNearPlane, mFarPlane);
    }
}

glm::mat4 Camera::orientation() const
{
    glm::mat4 orientation;
    orientation = glm::rotate(orientation, glm::radians(mVerticalAngle), glm::vec3(1, 0, 0));
    orientation = glm::rotate(orientation, glm::radians(mHorizontalAngle), glm::vec3(0, 1, 0));
    return orientation;
}

void Camera::lookAt(const glm::vec3 &at)
{
    assert(mPosition != at);
    //position =
}

void Camera::move(const glm::vec3 &offset)
{
    mPosition += offset;
}

void Camera::moveTo(const glm::vec3 &pos)
{
    if (mPosition != pos)
    {
        mPosition = pos;
    }
}

const glm::mat4 &Camera::projectionMatrix()
{
    return mProjectMatrix;
}

const glm::mat4 &Camera::viewMatrix()
{
    return mViewMatrix;
}

} // namespace util
} // namespace svl