using Sandbox.UI.Construct;
using System;

namespace Sandbox.UI.Tests.Elements;

public class RenderScene : Panel
{
	readonly ScenePanel scenePanel;

	Angles CamAngles = new( 25.0f, 0.0f, 0.0f );
	float CamDistance = 120;
	Vector3 CamPos => Vector3.Up * 10 + CamAngles.Forward * -CamDistance;

	SceneParticles particleObj;

	public RenderScene()
	{
		Style.FlexWrap = Wrap.Wrap;
		Style.JustifyContent = Justify.Center;
		Style.AlignItems = Align.Center;
		Style.AlignContent = Align.Center;
		Style.Padding = 0;
		Style.SetBackgroundImage( "/content/background.png" );
		Style.Width = Length.Percent( 100 );
		Style.Height = Length.Percent( 100 );

		var world = new SceneWorld();
		scenePanel = new ScenePanel();
		scenePanel.World = world;
		scenePanel.Camera.Position = CamPos;
		scenePanel.Camera.Rotation = Rotation.From( CamAngles );
		scenePanel.Camera.FieldOfView = 70;

		scenePanel.Style.Width = Length.Percent( 100 );
		scenePanel.Style.Height = Length.Percent( 100 );

		AddChild( scenePanel );

		new SceneModel( world, "models/citizen_props/roadcone01.vmdl", Transform.Zero );
		new SceneModel( world, "models/room.vmdl", Transform.Zero );

		new SceneLight( world, Vector3.Up * 150.0f, 200.0f, Color.Red * 5.0f );
		new SceneLight( world, Vector3.Up * 10.0f + Vector3.Forward * 100.0f, 200, Color.White * 15.0f );
		new SceneLight( world, Vector3.Up * 10.0f + Vector3.Backward * 100.0f, 200, Color.Magenta * 15f );
		new SceneLight( world, Vector3.Up * 10.0f + Vector3.Right * 100.0f, 200, Color.Blue * 15.0f );
		new SceneLight( world, Vector3.Up * 10.0f + Vector3.Left * 100.0f, 200, Color.Green * 15.0f );

		particleObj = new SceneParticles( world, "particles/example/int_from_model_example/int_from_model_example.vpcf" );

	}


	public override void OnMouseWheel( Vector2 value )
	{
		CamDistance += value.y * 10.0f;
		CamDistance = CamDistance.Clamp( 10, 700 );

		base.OnMouseWheel( value );
	}

	public override void OnButtonEvent( ButtonEvent e )
	{
		if ( e.Button == "mouseleft" )
		{
			SetMouseCapture( e.Pressed );
		}

		base.OnButtonEvent( e );
		e.StopPropagation = true;
	}

	protected override void OnMouseDown( MousePanelEvent e )
	{
		base.OnMouseDown( e );

		e.StopPropagation();
	}

	public override void Tick()
	{
		base.Tick();

		if ( HasMouseCapture )
		{
			CamAngles.pitch += Mouse.Delta.y;
			CamAngles.yaw -= Mouse.Delta.x;
			CamAngles.pitch = CamAngles.pitch.Clamp( 0, 90 );
		}

		scenePanel.Camera.Position = CamPos;
		scenePanel.Camera.Rotation = Rotation.From( CamAngles );

		// it feels dumb that particle scene objects need pumping manually
		// so we should look at allowing them to
		particleObj?.Simulate( RealTime.Delta );
		particleObj?.SetControlPoint( 0, Vector3.Up * 30.0f );

		float f = 1;
		foreach ( var obj in scenePanel.World.SceneObjects )
		{
			if ( obj is not SceneLight ) continue;

			obj.Position += new Vector3( MathF.Sin( f + RealTime.Now * 2.0f ), MathF.Cos( f + RealTime.Now * 2.0f ), 0 ) * RealTime.Delta * 100.0f;
			f += 1.0f;
		}
	}
}