using System;
using System.Linq;
using Sandbox;

public sealed class CameraWobble : Component
{
    [Property] public float Intensity { get; set; } = 0.0f;
    [Property] public float Speed { get; set; } = 1.2f;

    private Rotation _originalLocalRotation;
    private CameraComponent _cameraComponent;
    private float _baseFieldOfView = 80f;

    protected override void OnStart()
    {
        _originalLocalRotation = LocalRotation;

        // Find the camera component on this object or its children
        _cameraComponent = Components.GetInDescendantsOrSelf<CameraComponent>();
        if ( _cameraComponent != null )
        {
            _baseFieldOfView = _cameraComponent.FieldOfView;
        }
    }

    protected override void OnUpdate()
    {
        if ( Intensity <= 0.0f )
        {
            LocalRotation = _originalLocalRotation;
            if ( _cameraComponent != null )
                _cameraComponent.FieldOfView = _baseFieldOfView;
            return;
        }

        // Layered sine waves for the rolling warble
        float t = Time.Now * Speed;

        float pitch = (MathF.Sin( t * 0.8f ) + (MathF.Sin( t * 2.2f ) * 0.3f)) * Intensity * 3.0f;
        float yaw   = (MathF.Cos( t * 0.6f ) + (MathF.Cos( t * 1.7f ) * 0.3f)) * Intensity * 3.0f;
        float roll  = MathF.Sin( t * 0.4f ) * Intensity * 4.0f;

        var wobbleRotation = Rotation.From( pitch, yaw, roll );
        LocalRotation = _originalLocalRotation * wobbleRotation;

        // Focus push-pull effect (breathing FOV warp)
        if ( _cameraComponent != null )
        {
            float fovOffset = MathF.Sin( t * 0.5f ) * Intensity * 2.5f;
            _cameraComponent.FieldOfView = _baseFieldOfView + fovOffset;
        }
    }
}