using Engine.Renderer.Camera;
using Engine.Util;
using OpenTK.Mathematics;

namespace Engine.Scene.Component;

public class PerspectiveCamera(
    GameObject gameObject,
    float aspectRatio,
    float fieldOfView,
    float nearPlane,
    float farPlane)
    : Component(gameObject), ICamera
{
    public float AspectRatio { get; set; } = aspectRatio;
    public float FieldOfView { get; set; } = fieldOfView;
    public float NearPlane { get; set; } = nearPlane;
    public float FarPlane { get; set; } = farPlane;

    public Matrix4 View
    {
        get
        {
            var transformMatrix = GameObject.Transform.TransformMatrix;
            var forward = new Vector4(0, 0, 1, 1).MulProject(transformMatrix);
            var eye = new Vector4(0, 0, 0, 1).MulProject(transformMatrix);
            var up = (new Vector4(0, 1, 0, 1).MulProject(transformMatrix) - eye).Normalized();

            return Matrix4.LookAt(eye.Xyz, forward.Xyz, up.Xyz);
        }
    }

    public Matrix4 Projection => Matrix4.CreatePerspectiveFieldOfView(FieldOfView, AspectRatio, NearPlane, FarPlane);
}