using Microsoft.Xna.Framework.Input;

using Syntriax.Engine.Core;
using Syntriax.Engine.Systems.Input;

namespace Pong.Behaviours;

public class CameraController : Behaviour
{
    private MonoGameCamera2DBehaviour cameraBehaviour = null!;
    private IButtonInputs<Keys> buttonInputs = null!;

    private float defaultZoomLevel = 1f;

    protected override void OnFirstActiveFrame()
    {
        cameraBehaviour ??= BehaviourController.GetRequiredBehaviour<MonoGameCamera2DBehaviour>();
        buttonInputs = Universe.FindRequiredBehaviour<IButtonInputs<Keys>>();

        buttonInputs.RegisterOnPress(Keys.F, SwitchToFullScreen);
        buttonInputs.RegisterOnPress(Keys.R, ResetCamera);
    }

    protected override void OnUpdate()
    {
        if (buttonInputs.IsPressed(Keys.U))
            cameraBehaviour.Zoom += Universe.Time.DeltaTime * 5f;
        if (buttonInputs.IsPressed(Keys.J))
            cameraBehaviour.Zoom -= Universe.Time.DeltaTime * 5f;


        if (buttonInputs.IsPressed(Keys.NumPad8)) cameraBehaviour.Transform.LocalPosition += Vector2D.Up * Universe.Time.DeltaTime * 500f;
        if (buttonInputs.IsPressed(Keys.NumPad2)) cameraBehaviour.Transform.LocalPosition -= Vector2D.Up * Universe.Time.DeltaTime * 500f;
        if (buttonInputs.IsPressed(Keys.NumPad6)) cameraBehaviour.Transform.LocalPosition += Vector2D.Right * Universe.Time.DeltaTime * 500f;
        if (buttonInputs.IsPressed(Keys.NumPad4)) cameraBehaviour.Transform.LocalPosition -= Vector2D.Right * Universe.Time.DeltaTime * 500f;


        if (buttonInputs.IsPressed(Keys.Q))
            cameraBehaviour.Transform.Rotation += Universe.Time.DeltaTime * 45f;
        if (buttonInputs.IsPressed(Keys.E))
            cameraBehaviour.Transform.Rotation -= Universe.Time.DeltaTime * 45f;
    }

    private void SwitchToFullScreen(IButtonInputs<Keys> inputs, Keys keys)
    {
        if (cameraBehaviour.Graphics.IsFullScreen)
            return;

        cameraBehaviour.Graphics.PreferMultiSampling = false;
        cameraBehaviour.Graphics.PreferredBackBufferWidth = cameraBehaviour.Graphics.GraphicsDevice.Adapter.CurrentDisplayMode.Width;
        cameraBehaviour.Graphics.PreferredBackBufferHeight = cameraBehaviour.Graphics.GraphicsDevice.Adapter.CurrentDisplayMode.Height;
        cameraBehaviour.Graphics.IsFullScreen = true;
        cameraBehaviour.Graphics.ApplyChanges();

        float previousScreenSize = Math.Sqrt(Math.Sqr(cameraBehaviour.Viewport.Width) + Math.Sqr(cameraBehaviour.Viewport.Height));
        float currentScreenSize = Math.Sqrt(Math.Sqr(cameraBehaviour.Graphics.GraphicsDevice.Viewport.Width) + Math.Sqr(cameraBehaviour.Graphics.GraphicsDevice.Viewport.Height));
        defaultZoomLevel /= previousScreenSize / currentScreenSize;
        cameraBehaviour.Zoom /= previousScreenSize / currentScreenSize;
        cameraBehaviour.Viewport = cameraBehaviour.Graphics.GraphicsDevice.Viewport;
    }

    private void ResetCamera(IButtonInputs<Keys> inputs, Keys keys)
    {
        cameraBehaviour.Zoom = defaultZoomLevel;
        cameraBehaviour.Transform.LocalPosition = Vector2D.Zero;
        cameraBehaviour.Transform.LocalRotation = 0f;
    }
}