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// Copyright 2022 Niantic, Inc. All Rights Reserved.

using System.Collections;
using Niantic.ARDK.AR;
using Niantic.ARDK.AR.ARSessionEventArgs;
using Niantic.ARDK.AR.HitTest;
using Niantic.ARDK.Utilities;
using Niantic.ARDK.Utilities.Input.Legacy;
using UnityEngine;

public class ARPlaneDetector : MonoBehaviour
{
    /// The camera used to render the scene. Used to get the center of the screen.
    public Camera Camera;
    /// The object we will place to represent the cursor!
    public GameObject CursorObject;
    //public GameObject PlacementObjectPf;

    /// A reference to the spawned cursor in the center of the screen.
    private GameObject _spawnedCursorObject;

    private IARSession _session;
    [SerializeField]
    private GameObject ObjectToSpawn;

     void Start()
    {
        
        ARSessionFactory.SessionInitialized += _SessionInitialized;
        

    }
    private void OnDestroy()
    {
        ARSessionFactory.SessionInitialized -= _SessionInitialized;

        var session = _session;
        if (session != null)
            session.FrameUpdated -= _FrameUpdated;

        DestroySpawnedCursor();
    }

    private void DestroySpawnedCursor()
    {
        if (_spawnedCursorObject == null)
            return;

        Destroy(_spawnedCursorObject);
        _spawnedCursorObject = null;
    }

    private void _SessionInitialized(AnyARSessionInitializedArgs args)
    {
        var oldSession = _session;
        if (oldSession != null)
            oldSession.FrameUpdated -= _FrameUpdated;

        var newSession = args.Session;
        _session = newSession;
        newSession.FrameUpdated += _FrameUpdated;
        newSession.Deinitialized += _OnSessionDeinitialized;

        
    }

    private void _OnSessionDeinitialized(ARSessionDeinitializedArgs args)
    {
        DestroySpawnedCursor();
    }

    private void _FrameUpdated(FrameUpdatedArgs args)
    {
        var camera = Camera;
        if (camera == null)
            return;

        var viewportWidth = camera.pixelWidth;
        var viewportHeight = camera.pixelHeight;

        // Hit testing for cursor in the middle of the screen
        var middle = new Vector2(viewportWidth / 2f, viewportHeight / 2f);

        var frame = args.Frame;
        // Perform a hit test and either estimate a horizontal plane, or use an existing plane and its
        // extents!
        var hitTestResults =
            frame.HitTest
            (
            viewportWidth,
            viewportHeight,
            middle,
            ARHitTestResultType.ExistingPlaneUsingExtent |
            ARHitTestResultType.EstimatedHorizontalPlane
            );

        if (hitTestResults.Count == 0)
            return;

        if (_spawnedCursorObject == null)
            _spawnedCursorObject = Instantiate(CursorObject, Vector2.one, Quaternion.identity);

        // Set the cursor object to the hit test result's position
        _spawnedCursorObject.transform.position = hitTestResults[0].WorldTransform.ToPosition();

        // Orient the cursor object to look at the user, but remain flat on the "ground", aka
        // only rotate about the y-axis

        _spawnedCursorObject.transform.LookAt
        (
            new Vector3
            (
            frame.Camera.Transform[0, 3],
            _spawnedCursorObject.transform.position.y,
            frame.Camera.Transform[2, 3]
            )
        );
    }

    private void Update()
    {
        if (_session == null)
        {
            return;
        }

        if (PlatformAgnosticInput.touchCount <= 0)
        {
            return;
        }

        var touch = PlatformAgnosticInput.GetTouch(0);
        if (touch.phase == TouchPhase.Began)
        {
            TouchBegan(touch);

            //if Cursor removes after touch
            /*
            ARSessionFactory.SessionInitialized -= _SessionInitialized;

            var session = _session;
            if (session != null)
                session.FrameUpdated -= _FrameUpdated;*/
        }
    }


    

    private void TouchBegan(Touch touch)
    {
        var currentFrame = _session.CurrentFrame;
        if (currentFrame == null)
        {
            return;
        }

        var camera = Camera;
        if (camera == null)
            return;

        var viewportWidth = camera.pixelWidth;
        var viewportHeight = camera.pixelHeight;

        // Hit testing for cursor in the middle of the screen
        var middle = new Vector2(viewportWidth / 2f, viewportHeight / 2f);



        var results = currentFrame.HitTest
        (
          Camera.pixelWidth,
          Camera.pixelHeight,
          middle,
          ARHitTestResultType.ExistingPlaneUsingExtent |
            ARHitTestResultType.EstimatedHorizontalPlane
        );

        int count = results.Count;
        Debug.Log("Hit test results: " + count);

        if (count <= 0)
            return;

        // Get the closest result
        var result = results[0];

        var hitPosition = result.WorldTransform.ToPosition();

        Instantiate(ObjectToSpawn, hitPosition, Quaternion.Euler(0, Camera.main.transform.eulerAngles.y, 0));

        var anchor = result.Anchor;
        Debug.LogFormat
        (
          "Spawning cube at {0} (anchor: {1})",
          hitPosition.ToString("F4"),
          anchor == null
            ? "none"
            : anchor.AnchorType + " " + anchor.Identifier
        );
    }
    
}