using System.Collections;
using System.Collections.Generic;
using System.IO;
using UnityEngine;
using UnityEngine.UI;

public class OpenCamera : MonoBehaviour
{
    // UI 相关参数

    public RawImage rawImage;

    public Button button_TakePhoto;

    // 摄像机图片参数

    private WebCamTexture webCamTexture;

    // Use this for initialization

    void Start()
    {

        // 打开相机

        StartCoroutine("OpenCameras");

        // 按钮绑定点击事件

        // button_TakePhoto.onClick.AddListener(TakePhotoAndSaveImage_Button);

    }

    /// <summary>

    /// 使用协程打开相机函数

    /// </summary>

    /// <returns></returns>

    IEnumerator OpenCameras()
    {

        // 申请相机权限

        yield return Application.RequestUserAuthorization(UserAuthorization.WebCam);

        // 判断是否有相机权限

        if (Application.HasUserAuthorization(UserAuthorization.WebCam))
        {

            // 获取相机设备

            WebCamDevice[] webCamDevices = WebCamTexture.devices;

            // 判断是否有相机设别

            if (webCamDevices != null && webCamDevices.Length > 0)
            {

                // 把 0 号设备（移动端后置摄像头）名称赋值

                string webCamName = webCamDevices[0].name;

                // 设置相机渲染宽高，并运行相机

                webCamTexture = new WebCamTexture(webCamName, Screen.width, Screen.height);
                //  webCamTexture.requestedFPS = 30;
                webCamTexture.Play();

                // 把获取的图像渲染到画布上

                rawImage.texture = webCamTexture;

            }

        }

    }

    /// <summary>

    /// 拍照保存函数的包装接口

    /// </summary>

    void TakePhotoAndSaveImage_Button()

    {

        // 调用拍照保存函数

        TakePhotoAndSaveImage(webCamTexture);

    }

    /// <summary>

    /// 保存图片的接口函数

    /// </summary>

    /// <param name="tex"></param>

    void TakePhotoAndSaveImage(WebCamTexture tex)
    {

        // 新建一个 Texture2D 来获取相机图片

        // 然后 把图片转成 JPG 格式的 bytes

        Texture2D texture2D = new Texture2D(tex.width, tex.height, TextureFormat.RGBA32, true);

        texture2D.SetPixels32(tex.GetPixels32());

        texture2D.Apply();

        byte[] imageBytes = texture2D.EncodeToJPG();

        // 判断图片 bytes 是否为空

        if (imageBytes != null && imageBytes.Length > 0)
        {

            // 判断Android 平台，进行对应路径设置

            string savePath;

            string platformPath = Application.streamingAssetsPath + "/MyTempPhotos";

#if UNITY_ANDROID && !UNITY_EDITOR

            platformPath = "/sdcard/DCIM/MyTempPhotos";

#endif

            // 如果文件夹不存在，就创建文件夹

            if (!Directory.Exists(platformPath))
            {

                Directory.CreateDirectory(platformPath);

            }

            // 保存图片

            savePath = platformPath + "/" + Time.deltaTime + ".jpg";

            File.WriteAllBytes(savePath, imageBytes);

        }

    }
}