#include <engine/camera/scene.hpp>
#include <glm/gtc/matrix_transform.hpp>

namespace Light {

SceneCamera::SceneCamera()
    : m_orthographic_specification { .size=1000.0f, .near_plane=-1.0f, .far_plane=10000.0f }
    , m_perspective_specification { .vertical_fov=glm::radians(45.0f), .near_plane=0.01f, .far_plane=10000.0f }
    , m_aspect_ratio(16.0f / 9.0f)
     
{
	calculate_projection();
}

void SceneCamera::set_viewport_size(unsigned int width, unsigned int height)
{
	m_aspect_ratio = width / (float)height;
	calculate_projection();
}

void SceneCamera::set_projection_type(ProjectionType projectionType)
{
	m_projection_type = projectionType;
	calculate_projection();
}

void SceneCamera::set_orthographic_size(float size)
{
	m_orthographic_specification.size = size;
	calculate_projection();
}

void SceneCamera::set_orthographic_far_plane(float farPlane)
{
	m_orthographic_specification.far_plane = farPlane;
	calculate_projection();
}

void SceneCamera::set_orthographic_near_plane(float nearPlane)
{
	m_orthographic_specification.near_plane = nearPlane;
	calculate_projection();
}

void SceneCamera::set_perspective_vertical_fov(float verticalFOV)
{
	m_perspective_specification.vertical_fov = verticalFOV;
	calculate_projection();
}

void SceneCamera::set_perspective_far_plane(float farPlane)
{
	m_perspective_specification.far_plane = farPlane;
	calculate_projection();
}

void SceneCamera::set_perspective_near_plane(float nearPlane)
{
	m_perspective_specification.near_plane = nearPlane;
	calculate_projection();
}

void SceneCamera::calculate_projection()
{
	if (m_projection_type == ProjectionType::Orthographic)
	{
		m_projection = glm::ortho(
		    -m_orthographic_specification.size * 0.5f * m_aspect_ratio,
		    m_orthographic_specification.size * 0.5f * m_aspect_ratio,
		    -m_orthographic_specification.size * 0.5f,
		    m_orthographic_specification.size * 0.5f,
		    m_orthographic_specification.far_plane,
		    m_orthographic_specification.near_plane
		);
	}
	else // perspective
	{
		m_projection = glm::perspective(
		    m_perspective_specification.vertical_fov,
		    m_aspect_ratio,
		    m_perspective_specification.near_plane,
		    m_perspective_specification.far_plane
		);
	}
}

} // namespace Light