using Sandbox;
using Sandbox.Utility;
using Sandbox.Diagnostics;
using System.Linq;

public sealed partial class Dedugan : Component
{
	public Component Pressed { get; set; }
	public bool EnablePressing { get; set; } = true;
	public Component Hovered { get; set; }

	[Sync( SyncFlags.Interpolate )] public Vector3 TracedHitPos { get; set; }
	[Sync] public bool CameraTraceIsHit { get; set; }
	public Vector3 TracedHitNormal { get; set; }

	void InteractionsUpdate()
	{
		if ( !EnablePressing ) return;

		if ( Pressed.IsValid() )
		{
			UpdatePressed();
		}
		else
		{
			UpdateHovered();
		}

		if ( Input.Pressed( "Ragdoll" ) )
		{
			Health = 100;
		}
	}

	private void UpdatePressed()
	{
		bool flag = Input.Down( "use" );

		if ( flag && Pressed.Components.TryGet<IPressable>( out var pressable ) )
		{
			flag = pressable.Pressing( new IPressable.Event
			{
				Ray = new Ray( Camera.WorldPosition, EyeAngles.ToRotation().Forward ), Source = this
			} );
		}

		if ( GetDistanceFromGameObject( Pressed.GameObject, Camera.WorldPosition ) > InteractDistance )
		{
			flag = false;
		}

		if ( !flag )
		{
			StopPressing();
		}
	}

	private void UpdateHovered()
	{
		if ( Pressed.IsValid() ) return;

		SwitchHovered( TryGetLookedAt() );

		if ( Hovered is IPressable pressable )
		{
			pressable.Look( new IPressable.Event
			{
				Ray = new Ray( Camera.WorldPosition, EyeAngles.ToRotation().Forward ), Source = this
			} );
		}

		if ( Input.Pressed( "use" ) )
		{
			StartPressing( Hovered );
		}
	}


	public void StartPressing( Component obj )
	{
		if ( Pressed == obj ) return;

		StopPressing();

		if ( !obj.IsValid() )
		{
			ISceneEvent<PlayerController.IEvents>.PostToGameObject( GameObject, x => x.FailPressing() );
			return;
		}

		var component = obj.Components.Get<IPressable>( FindMode.EnabledInSelfAndDescendants );
		if ( component != null )
		{
			var pressEvent = new IPressable.Event
			{
				Ray = new Ray( Camera.WorldPosition, EyeAngles.ToRotation().Forward ), Source = this
			};

			if ( !component.CanPress( pressEvent ) )
			{
				ISceneEvent<PlayerController.IEvents>.PostToGameObject( GameObject, x => x.FailPressing() );
				return;
			}

			component.Press( pressEvent );
		}

		Pressed = obj;

		if ( Pressed.IsValid() )
		{
			ISceneEvent<PlayerController.IEvents>.PostToGameObject( GameObject, x => x.StartPressing( Pressed ) );
		}
	}

	public void StopPressing()
	{
		if ( Pressed.IsValid() )
		{
			ISceneEvent<PlayerController.IEvents>.PostToGameObject( GameObject, x => x.StopPressing( Pressed ) );

			if ( Pressed is IPressable pressable )
			{
				pressable.Release( new IPressable.Event
				{
					Ray = new Ray( Camera.WorldPosition, EyeAngles.ToRotation().Forward ), Source = this
				} );
			}

			Pressed = null;
		}
	}

	private void SwitchHovered( Component obj )
	{
		var e = new IPressable.Event
		{
			Ray = new Ray( Camera.WorldPosition, EyeAngles.ToRotation().Forward ), Source = this
		};

		if ( Hovered == obj )
		{
			if ( Hovered is IPressable pressable )
				pressable.Look( e );
			return;
		}

		if ( Hovered is IPressable oldPressable )
			oldPressable.Blur( e );

		Hovered = obj;

		if ( Hovered is IPressable newPressable )
		{
			newPressable.Hover( e );
			newPressable.Look( e );
		}
	}

	private Component TryGetLookedAt()
	{
		var from = Scene.Camera.WorldPosition + Scene.Camera.WorldRotation.Forward;
		var to = from + Scene.Camera.WorldRotation.Forward * InteractDistance;

		var trace = Scene.Trace
			.Ray( from, to )
			.IgnoreGameObjectHierarchy( GameObject )
			.Run();

		TracedHitPos = trace.Hit ? trace.HitPosition : trace.EndPosition;
		CameraTraceIsHit = trace.Hit;
		TracedHitNormal = trace.Normal;

		if ( !trace.Hit || !trace.GameObject.IsValid() ) return null;

		var go = trace.GameObject;

		var pressable = go.Components.Get<IPressable>( FindMode.EnabledInSelfAndDescendants );

		if ( pressable != null && pressable.CanPress( new IPressable.Event
		    {
			    Ray = new Ray( Camera.WorldPosition, EyeAngles.ToRotation().Forward ), Source = this
		    } ) )
		{
			return pressable as Component;
		}

		return null;
	}

	private float GetDistanceFromGameObject( GameObject obj, Vector3 point )
	{
		Vector3 closest = obj.WorldPosition;
		float minDist = Vector3.DistanceBetween( closest, point );

		foreach ( var col in Pressed.GetComponentsInChildren<Collider>() )
		{
			Vector3 cp = col.FindClosestPoint( point );
			float dist = Vector3.DistanceBetween( cp, point );
			if ( dist < minDist )
				minDist = dist;
		}

		return minDist;
	}
}