//======= Copyright (c) Valve Corporation, All rights reserved. ===============
//
// Purpose: Highlights the controller when hovering over interactables
//
//=============================================================================

using UnityEngine;
using System.Collections;

namespace Valve.VR.InteractionSystem
{
	//-------------------------------------------------------------------------
	public class ControllerHoverHighlight : MonoBehaviour
	{
		public Material highLightMaterial;
		public bool fireHapticsOnHightlight = true;

		private Hand hand;

		private MeshRenderer bodyMeshRenderer;
		private MeshRenderer trackingHatMeshRenderer;
		private SteamVR_RenderModel renderModel;
		private bool renderModelLoaded = false;

		SteamVR_Events.Action renderModelLoadedAction;

		//-------------------------------------------------
		void Start()
		{
			hand = GetComponentInParent<Hand>();
		}


		//-------------------------------------------------
		void Awake()
		{
			renderModelLoadedAction = SteamVR_Events.RenderModelLoadedAction( OnRenderModelLoaded );
		}


		//-------------------------------------------------
		void OnEnable()
		{
			renderModelLoadedAction.enabled = true;
		}


		//-------------------------------------------------
		void OnDisable()
		{
			renderModelLoadedAction.enabled = false;
		}


		//-------------------------------------------------
		private void OnHandInitialized( int deviceIndex )
		{
			renderModel = gameObject.AddComponent<SteamVR_RenderModel>();
			renderModel.SetDeviceIndex( deviceIndex );
			renderModel.updateDynamically = false;
		}


		//-------------------------------------------------
		private void OnRenderModelLoaded( SteamVR_RenderModel renderModel, bool success )
		{
			if ( renderModel != this.renderModel )
			{
				return;
			}

			Transform bodyTransform = transform.Find( "body" );
			if ( bodyTransform != null )
			{
				bodyTransform.gameObject.layer = gameObject.layer;
				bodyTransform.gameObject.tag = gameObject.tag;
				bodyMeshRenderer = bodyTransform.GetComponent<MeshRenderer>();
				bodyMeshRenderer.material = highLightMaterial;
				bodyMeshRenderer.enabled = false;
			}

			Transform trackingHatTransform = transform.Find( "trackhat" );
			if ( trackingHatTransform != null )
			{
				trackingHatTransform.gameObject.layer = gameObject.layer;
				trackingHatTransform.gameObject.tag = gameObject.tag;
				trackingHatMeshRenderer = trackingHatTransform.GetComponent<MeshRenderer>();
				trackingHatMeshRenderer.material = highLightMaterial;
				trackingHatMeshRenderer.enabled = false;
			}

			foreach ( Transform child in transform )
			{
				if ( ( child.name != "body" ) && ( child.name != "trackhat" ) )
				{
					Destroy( child.gameObject );
				}
			}

			renderModelLoaded = true;
		}


		//-------------------------------------------------
		private void OnParentHandHoverBegin( Interactable other )
		{
			if ( !this.isActiveAndEnabled )
			{
				return;
			}

			if ( other.transform.parent != transform.parent )
			{
				ShowHighlight();
			}
		}


		//-------------------------------------------------
		private void OnParentHandHoverEnd( Interactable other )
		{
			HideHighlight();
		}


		//-------------------------------------------------
		private void OnParentHandInputFocusAcquired()
		{
			if ( !this.isActiveAndEnabled )
			{
				return;
			}

			if ( hand.hoveringInteractable && hand.hoveringInteractable.transform.parent != transform.parent )
			{
				ShowHighlight();
			}
		}


		//-------------------------------------------------
		private void OnParentHandInputFocusLost()
		{
			HideHighlight();
		}


		//-------------------------------------------------
		public void ShowHighlight()
		{
			if ( renderModelLoaded == false )
			{
				return;
			}

			if ( fireHapticsOnHightlight )
			{
				hand.controller.TriggerHapticPulse( 500 );
			}

			if ( bodyMeshRenderer != null )
			{
				bodyMeshRenderer.enabled = true;
			}

			if ( trackingHatMeshRenderer != null )
			{
				trackingHatMeshRenderer.enabled = true;
			}
		}


		//-------------------------------------------------
		public void HideHighlight()
		{
			if ( renderModelLoaded == false )
			{
				return;
			}

			if ( fireHapticsOnHightlight )
			{
				hand.controller.TriggerHapticPulse( 300 );
			}

			if ( bodyMeshRenderer != null )
			{
				bodyMeshRenderer.enabled = false;
			}

			if ( trackingHatMeshRenderer != null )
			{
				trackingHatMeshRenderer.enabled = false;
			}
		}
	}
}