using AOT;
using EZXR.Glass.Core;
using EZXR.Glass.Device;
using EZXR.Glass.Recording;
using EZXR.Glass.SixDof;
using System;
using System.Collections;
using System.IO;
using System.Runtime.InteropServices;
using UnityEngine;

namespace EZXR.Glass.Projection
{
    public class ProjectionManager : MonoBehaviour
    {
        private static ProjectionManager instance;
        public static ProjectionManager Instance
        {
            get
            {
                return instance;
            }
        }

        public Camera projectionCamera;
        RenderTexture renderTexture;

        /// <summary>
        /// 0是不做任何操作，1是开始，2是正在执行投录屏，-1是被停止
        /// </summary>
        int startProjection;

        /// <summary> Renders the event delegate described by eventID. </summary>
        /// <param name="eventID"> Identifier for the event.</param>
        private delegate void RenderEventDelegate(int eventID);
        /// <summary> Handle of the render thread. </summary>
        private static RenderEventDelegate RenderThreadHandle = new RenderEventDelegate(RunOnRenderThread);
        /// <summary> The render thread handle pointer. </summary>
        private static IntPtr RenderThreadHandlePtr = Marshal.GetFunctionPointerForDelegate(RenderThreadHandle);

        /// <summary>
        /// 测试用，保存一张渲染的图
        /// </summary>
        bool justSaveOnePic;
        private GameObject cameraRigObj;

        private void Awake()
        {
            instance = this;
            ProjectionAPI.Init(OnStart, OnStop);
            NativeLib.CallBack_OnProjectionDetected += OnProjectionDetected;
            NativeLib.Resume();
            projectionCamera.GetComponent<PhonePoseTrackerRGB>().enabled = false;
        }

        // Start is called before the first frame update
        void Start()
        {
            Debug.Log("ProjectionManager ==> Init Start");
            StartCoroutine(Init());
            DontDestroyOnLoad(this.gameObject);
        }

        IEnumerator Init()
        {
            yield return new WaitForEndOfFrame();
            yield return new WaitForEndOfFrame();
            yield return new WaitForEndOfFrame();

            Debug.Log("ProjectionManager ==> Init 0");
            while (!NativeTracking.GetIsARSessionInited())
            {
                yield return new WaitForEndOfFrame();
            }
            Debug.Log("ProjectionManager ==> Init 1");

            CameraResolution cameraResolution = new CameraResolution();
#if UNITY_EDITOR
            cameraResolution.width = 1280;
            cameraResolution.height = 960;
            StartCoroutine(WaitEndOfFrame());
#else
        Debug.Log("ProjectionManager ==> Init 2");
        NormalRGBCameraDevice rgbCameraDevice = new NormalRGBCameraDevice();
        int[] sizeRgbCamera = rgbCameraDevice.getCameraSize();
        cameraResolution.width = sizeRgbCamera[0];
        cameraResolution.height = sizeRgbCamera[1];
#endif
            Debug.Log("ProjectionManager ==> Init 3");
            renderTexture = new RenderTexture(cameraResolution.width, cameraResolution.height, 24, RenderTextureFormat.DefaultHDR);
            projectionCamera.targetTexture = renderTexture;
            Debug.Log("ProjectionManager ==> Init renderTexture size: " + renderTexture.width + "," + renderTexture.height + "; GetNativeTexturePtr: " + renderTexture.GetNativeTexturePtr().ToInt32());
        }

        // Update is called once per frame
        void Update()
        {
            //if (Input.GetKeyDown(KeyCode.Escape))
            //{
            //    Debug.Log("ProjectionManager ==> justSaveOnePic: true");
            //    justSaveOnePic = true;
            //}
            if (NativeTracking.GetIsARSessionInited())
            {
                if (startProjection == 1)
                {
                    if (renderTexture != null)
                    {
                        startProjection = 2;
                        Debug.Log("ProjectionManager ==> Start: " + renderTexture.GetNativeTexturePtr().ToInt32());

                        projectionCamera.enabled = true;
                        projectionCamera.GetComponent<PhonePoseTrackerRGB>().enabled = true;
                        ProjectionAPI.Start(renderTexture.GetNativeTexturePtr().ToInt32(), 1280, 960);
                        StartCoroutine(WaitEndOfFrame());
                    }
                }
                else if (startProjection == -1)
                {
                    StopProjection();
                }
            }
            if (cameraRigObj == null) {
                cameraRigObj = HMDPoseTracker.Instance.gameObject;
            }
            
            if (cameraRigObj != null && cameraRigObj.transform.parent != null)
            {
                Transform bodyRig = cameraRigObj.transform.parent;
                
                if (cameraRigObj.transform.parent != null && bodyRig.name != "XRMan")
                {
                    this.transform.position = bodyRig.position;
                    this.transform.rotation = bodyRig.rotation;
                }
            }
            else
            {
                this.transform.position = Vector3.zero;
                this.transform.rotation = Quaternion.identity;
            }
        }

        void StopProjection()
        {
            Debug.Log("ProjectionManager ==> StopProjection");
            projectionCamera.enabled = false;
            projectionCamera.GetComponent<PhonePoseTrackerRGB>().enabled = false;
            startProjection = 0;
            StopAllCoroutines();
        }

        private void OnDestroy()
        {
            Debug.Log("ProjectionManager ==> OnDestroy startProjection=" + startProjection);
            ProjectionAPI.DeInit();
        }

        private void OnApplicationPause(bool pause)
        {
            if (pause)
            {
                Debug.Log("ProjectionManager OnApplicationPause 0");
                if (startProjection == 2)
                {
                    Debug.Log("ProjectionManager OnApplicationPause 1");
                    StopProjection();
                    Debug.Log("ProjectionManager OnApplicationPause 2");
                    NativeLib.Pause();
                    ProjectionAPI.Stop();
                }
            }
            else
            {
                Debug.Log("ProjectionManager OnApplicationPause 3");
                NativeLib.Resume();
                Debug.Log("ProjectionManager OnApplicationPause 4");
            }
        }

        /// <summary>
        /// 开始投屏或录屏
        /// </summary>
        /// <param name="type">0投屏 1录屏 2截屏</param>
        void OnStart(int type)
        {
            Debug.Log("ProjectionManager ==> OnStart: " + type);
            startProjection = 1;
        }

        /// <summary>
        /// 投屏或录屏结束了（是一个被动通知，应用收到后只需要处理好自身停止录屏的逻辑不需要调用stop接口。整个投录屏功能结束才会回调此处，应用退出或者到后台都不会回调这里）
        /// </summary>
        void OnStop()
        {
            Debug.Log("ProjectionManager ==> OnStop");
            startProjection = -1;
        }

        void OnProjectionDetected()
        {
            Debug.Log("ProjectionManager ==> OnProjectionDetected");
            startProjection = 1;
        }

        IEnumerator WaitEndOfFrame()
        {
            //camera刚开启的当前帧是不渲染的
            yield return new WaitForEndOfFrame();

            while (true)
            {
                yield return new WaitForEndOfFrame();
                if (justSaveOnePic)
                {
                    Debug.Log("ProjectionManager ==> SaveRenderTexture");
                    justSaveOnePic = false;
                    SaveRenderTexture();
                }
#if !UNITY_EDITOR
            GL.IssuePluginEvent(RenderThreadHandlePtr, 0);
#endif
            }
        }

        void SaveRenderTexture()
        {
            Debug.Log("ProjectionManager ==> SaveRenderTexture 0");
            RenderTexture.active = renderTexture;
            Texture2D texture = new Texture2D(renderTexture.width, renderTexture.height, TextureFormat.ARGB32, false);
            texture.ReadPixels(new Rect(0, 0, renderTexture.width, renderTexture.height), 0, 0);
            texture.Apply();
            Debug.Log("ProjectionManager ==> SaveRenderTexture 1");
            byte[] bytes = texture.EncodeToPNG();
            Debug.Log("ProjectionManager ==> SaveRenderTexture size: " + bytes.Length);
            string path = Path.Combine(Application.persistentDataPath, "saved.png");
            Debug.Log("ProjectionManager ==> SaveRenderTexture path: " + path);
            File.WriteAllBytes(path, bytes);
            Debug.Log("ProjectionManager ==> SaveRenderTexture 2");
        }

        /// <summary> Executes the 'on render thread' operation. </summary>
        /// <param name="eventID"> Identifier for the event.</param>
        [MonoPInvokeCallback(typeof(RenderEventDelegate))]
        private static void RunOnRenderThread(int eventID)
        {
            long timeStamp = (long)(ARFrame.HeadPoseRgbTimestamp * 1e9);
            //Debug.Log("ProjectionManager ==> RunOnRenderThread HeadPoseRgbTimestamp: " + timeStamp);
            ProjectionAPI.NotifyNewFrame(timeStamp);
        }
    }
}