using System.Collections;
using System.Collections.Generic;

using UnityEngine;
using UnityEngine.Android;

using Mediapipe.Unity;
using Mediapipe.Unity.IrisTracking;

using TMPro;
using System.Linq;

public class CameraController : MonoBehaviour
{
    public IrisTrackingGraph irisTrackingGraph;
    public Transform camera;
    public TMP_Text text;
    public Vector2 leftEyeSize,rightEyeSize;
    IEnumerator Start()
    {
        Debug.Log("Start");
        
        Permission.RequestUserPermission(Permission.Camera);
        
        while(!(ImageSourceProvider.ImageSource is var source && source && source.isPlaying))
            yield return new WaitForEndOfFrame();

        Debug.LogFormat("ImageSourceProvider.ImageSource : {0}",ImageSourceProvider.ImageSource);

        while(irisTrackingGraph._faceLandmarksWithIrisStream == null)
            yield return new WaitForEndOfFrame();

        Debug.LogFormat("irisTrackingGraph : {0}",irisTrackingGraph._faceLandmarksWithIrisStream);
        irisTrackingGraph._faceLandmarksWithIrisStream.AddListener((sender,output) => {
            if(output?.value?.Landmark == null)
            {
                Debug.LogError("No landmark detected");
                return;
            }

            var parts = FaceLandmarkListWithIrisAnnotation.PartitionLandmarkList(output.value.Landmark);
            if(parts.leftIris == null && parts.rightIris == null)
            {
                Debug.LogError("No iris detected");
                return;
            }

            leftEyeSize = new Vector2(parts.leftIris.Distance(1,3).Value,parts.leftIris.Distance(2,4).Value);
            rightEyeSize = new Vector2(parts.rightIris.Distance(1,3).Value,parts.rightIris.Distance(2,4).Value);
        });
    }

    WebCamSource webCamSource;
    void Update()
    {
        if(!webCamSource)
            webCamSource = GameObject.FindFirstObjectByType<WebCamSource>();

        if(text && RelativeOffcenter.cameraCharacteristics?.Length > 0 && webCamSource?.webCamDevice?.isFrontFacing is bool facing)
        {
            var preferFacing = facing ? RelativeOffcenter.PreferFacing.Front : RelativeOffcenter.PreferFacing.Back;

            var cc = RelativeOffcenter.cameraCharacteristics.OrderBy((characteristics) => characteristics.preferFacing == preferFacing ? 0 : 1).First();

            var eyeSize = 11.75f * Vector2.one;
            var dl = cc.DistanceMM(0,leftEyeSize * cc.SensorSizePx,eyeSize) / 1000;
            var dr = cc.DistanceMM(0,rightEyeSize * cc.SensorSizePx,eyeSize) / 1000;
            text.text = string.Join("\n", "L : " + leftEyeSize.ToString("0.0000"),"R : " + rightEyeSize.ToString("0.0000"),"DL : " + dl.ToString("0.0000"),"DR : " + dr.ToString("0.0000"));
        }
    }
}