package com.hdl.photovoltaic.utils;


import android.content.Context;
import android.content.pm.FeatureInfo;
import android.content.pm.PackageManager;
import android.hardware.camera2.CameraAccessException;
import android.hardware.camera2.CameraCharacteristics;
import android.hardware.camera2.CameraManager;
import android.os.Build;
import android.hardware.Camera;
import android.text.method.Touch;

import java.util.Optional;

public class FlashLightUtils {
    private CameraManager manager;
    private Camera mCamera = null;
    private Context context;
    private boolean status = false;     // 记录手机状态

    public FlashLightUtils(Context context) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            manager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);

        }
        this.context = context;
    }

    // 打开手电筒
    public void open() {
        if (status) {   //如果是打开状态,不需要打开
            return;
        }
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
            try {
                manager.setTorchMode("0", true);
            } catch (CameraAccessException e) {
                e.printStackTrace();
            }
        } else {
            PackageManager packageManager = context.getPackageManager();
            FeatureInfo[] features = packageManager.getSystemAvailableFeatures();
            for (FeatureInfo featureInfo : features) {
                // 判断设备是否支持闪光灯
                if (PackageManager.FEATURE_CAMERA_FLASH.equals(featureInfo.name)) {
                    if (null == mCamera) {
                        mCamera = Camera.open();
                    }
                    Camera.Parameters parameters = mCamera.getParameters();
                    parameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
                    mCamera.setParameters(parameters);
                    mCamera.startPreview();

                }
            }
        }
        status = true;      // 记录手电筒状态为打开
    }

    // 关闭手电筒
    public void close() {
        if (!status)    // 如果是已经关闭的状态 不需要打开
        {
            return;
        }
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
            try {
                manager.setTorchMode("0", false);

            } catch (CameraAccessException e) {
                e.printStackTrace();
            }
        } else {
            if (mCamera != null) {
                mCamera.stopPreview();
                mCamera.release();
                mCamera = null;
            }
        }
        status = false; // 记录手电筒为关闭
    }

    /**
     * 手电筒打开或者关闭
     *
     * @param isOpen 打开(true)或者关闭(false)
     */
    public void setOpenOrClose(boolean isOpen) {
        try {

            //获取当前手机所有摄像头设备ID
            String[] ids = manager.getCameraIdList();
            for (String id : ids) {
                CameraCharacteristics c = manager.getCameraCharacteristics(id);
                //查询该摄像头组件是否包含闪光灯
                Boolean flashAvailable = c.get(CameraCharacteristics.FLASH_INFO_AVAILABLE);

                /*
                 * 获取相机面对的方向
                 * CameraCharacteristics.LENS_FACING_FRONT 前置摄像头
                 * CameraCharacteristics.LENS_FACING_BACK 后只摄像头
                 * CameraCharacteristics.LENS_FACING_EXTERNAL 外部的摄像头
                 */
                Integer lensFacing = c.get(CameraCharacteristics.LENS_FACING);
                if (flashAvailable != null && flashAvailable
                        && lensFacing != null && lensFacing == CameraCharacteristics.LENS_FACING_BACK) {
                    //打开或关闭手电筒
                    manager.setTorchMode(id, isOpen);
                    break;
                }
            }
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }


}