using System;
using System.Collections;
using UnityEngine;
using UnityEngine.UI;

public class WebcamControllerPanel : PanelBasic
{
    public RawImage camera_rawimage;//相机渲染的UI
    //public GameObject quad;//相机渲染的GameObject
    private WebCamTexture webCamTexture;
    private Coroutine open_camera;

    public delegate void OpenCameraDelegate(string _msg, string _type);
    public OpenCameraDelegate open_camera_msg;
    void Start()
    {

    }

    private void Update()
    {

        if (Input.GetKey(KeyCode.H))
        {
            webCamTexture.Stop();
        }
        if (Input.GetKey(KeyCode.M))
        {
            webCamTexture.Play();
        }

    }

    /// <summary>
    /// 打开摄像机
    /// </summary>
    public void ToOpenCamera()
    {
        open_camera = StartCoroutine("OpenCamera");
    }
    public IEnumerator OpenCamera()
    {
        int maxl = Screen.width;
        if (Screen.height > Screen.width)
        {
            maxl = Screen.height;
        }

        // 申请摄像头权限
        yield return Application.RequestUserAuthorization(UserAuthorization.WebCam);
        if (Application.HasUserAuthorization(UserAuthorization.WebCam))
        {
            if (webCamTexture != null)
            {
                webCamTexture.Stop();
            }

            //打开渲染图
            if (camera_rawimage != null)
            {
                camera_rawimage.gameObject.SetActive(true);
            }
            //if (quad != null)
            //{
            //    quad.gameObject.SetActive(true);
            //}

            // 监控第一次授权，是否获得到设备（因为很可能第一次授权了，但是获得不到设备，这里这样避免）
            // 多次 都没有获得设备，可能就是真没有摄像头，结束获取 camera
            int i = 0;
            while (WebCamTexture.devices.Length <= 0 && 1 < 300)
            {
                yield return new WaitForEndOfFrame();
                i++;
            }
            WebCamDevice[] devices = WebCamTexture.devices;//获取可用设备
            if (WebCamTexture.devices.Length <= 0)
            {
                Debug.LogError("没有摄像头设备，请检查");
                open_camera_msg?.Invoke("没有摄像头设备，请检查!", "warning");
            }
            else
            {
                string devicename = devices[0].name;
                webCamTexture = new WebCamTexture(devicename, maxl, maxl == Screen.height ? Screen.width : Screen.height, 30)
                {
                    wrapMode = TextureWrapMode.Repeat
                };

                // 渲染到 UI 或者 游戏物体上
                if (camera_rawimage != null)
                {
                    camera_rawimage.texture = webCamTexture;
                }

                //if (quad != null)
                //{
                //    quad.GetComponent<Renderer>().material.mainTexture = webCamTexture;
                //}

                webCamTexture.Play();

                open_camera_msg?.Invoke("摄像头已打开", "log");
            }
        }
        else
        {
            Debug.LogError("未获得读取摄像头权限");
            open_camera_msg?.Invoke("未获得读取摄像头权限!", "warning");
        }
    }

    private void OnApplicationPause(bool pause)
    {
        // 应用暂停的时候暂停camera，继续的时候继续使用
        if (webCamTexture != null)
        {
            if (pause)
            {
                webCamTexture.Pause();
            }
            else
            {
                webCamTexture.Play();
            }
        }

    }

    public void OnActive(bool _use_real_camera)
    {
        OnActive();
        if (_use_real_camera)
        {
            ToOpenCamera();
        }
    }

    public override void OnActive(Image _main_panel = null, Image _mask = null, Action _callback = null)
    {
        base.OnActive(_main_panel, _mask, _callback);
        camera_rawimage.gameObject.SetActive(true);
    }

    public override void OnNagetive(bool _active_last_panel)
    {
        base.OnNagetive(_active_last_panel);
        if (open_camera != null)
        {
            StopCoroutine(open_camera);
            open_camera_msg?.Invoke("摄像头已关闭", "log");
            //后添加的用来在停止摄像头的时候禁用摄像头的方法
            if (webCamTexture != null)
            {
                webCamTexture.Stop();
            }
        }
        camera_rawimage.gameObject.SetActive(false);
    }

    private void OnDestroy()
    {
        if (webCamTexture != null)
        {
            webCamTexture.Stop();
        }
    }
}