package com.njcn.huawei.obs.util;

import com.njcn.huawei.obs.config.HuaweiObsProperties;
import com.obs.services.ObsClient;
import com.obs.services.exception.ObsException;
import com.obs.services.model.*;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @author hongawen
 * @version 1.0.0
 * @date 2023年03月01日 14:10
 */
@Slf4j
@Component
@RequiredArgsConstructor
public class OBSUtil {

    private final HuaweiObsProperties huaweiObsProperties;


    /**
     * 上传注意事项：文件名不能以 / 开头，
     * 比如错误名称：/comtrade/192.168.1.190/xxxx.dat
     * 正确名称为：comtrade/192.168.1.190/xxxx.dat
     * 上述文件名在上传文件到obs桶中时，会自动创建 comtrade、192.168.1.190两个文件夹
     * 不同的业务功能可以通过文件夹去区分，比如稳态、暂态等报表、波形文件等等
     * 前端form文件上传
     *
     * @author hongawen
     * @date 2023/3/1 20:50
     */
    public String multiFileUpload(MultipartFile uploadFile, String fileName) {
        ObsClient obsClient = null;
        try {
            obsClient = huaweiObsProperties.getInstance();
            String bucketName = huaweiObsProperties.getObs().getBucket();
            // 判断桶是否存在
            judgeBucket(obsClient, bucketName);
            InputStream inputStream = uploadFile.getInputStream();
            long available = inputStream.available();
            PutObjectRequest request = new PutObjectRequest(bucketName, fileName, inputStream);
            ObjectMetadata objectMetadata = new ObjectMetadata();
            objectMetadata.setContentLength(available);
            request.setMetadata(objectMetadata);
            // 设置对象访问权限为公共读
            request.setAcl(AccessControlList.REST_CANNED_PUBLIC_READ);
            PutObjectResult result = obsClient.putObject(request);
            // 读取该已上传对象的URL
            log.info("已上传对象的URL" + result.getObjectUrl());
            return result.getObjectUrl();
        } catch (ObsException e) {
            log.error("obs上传失败", e);
        } catch (IOException e) {
            log.error("上传失败", e);
        } finally {
            huaweiObsProperties.destroy(obsClient);
        }
        return null;
    }


    /***
     * 流式文件上传
     * @author hongawen
     * @date 2023/3/2 10:18
     */
    public String streamUpload(FileInputStream inputStream, String fileName) {
        ObsClient obsClient = null;
        try {
            obsClient = huaweiObsProperties.getInstance();
            String bucketName = huaweiObsProperties.getObs().getBucket();
            // 判断桶是否存在
            judgeBucket(obsClient, bucketName);
            long available = inputStream.available();
            PutObjectRequest request = new PutObjectRequest(bucketName, fileName, inputStream);
            ObjectMetadata objectMetadata = new ObjectMetadata();
            objectMetadata.setContentLength(available);
            request.setMetadata(objectMetadata);
            // 设置对象访问权限为公共读
            request.setAcl(AccessControlList.REST_CANNED_PUBLIC_READ);
            PutObjectResult result = obsClient.putObject(request);
            // 读取该已上传对象的URL
            log.info("已上传对象的URL" + result.getObjectUrl());
            return result.getObjectUrl();
        } catch (ObsException e) {
            log.error("obs上传失败", e);
        } catch (IOException e) {
            log.error("上传失败", e);
        } finally {
            huaweiObsProperties.destroy(obsClient);
        }
        return null;
    }

    /***
     * 获取文件上传后的url
     * @author hongawen
     * @date 2023/3/2 11:46
     */
    public String getFileUrl(String fileName) {
        ObsClient obsClient = null;
        try {
            obsClient = huaweiObsProperties.getInstance();
            // URL有效期，3600秒
            Map<String, String> headers = new HashMap<>();
            headers.put("Content-Type", "application/octet-stream");
            TemporarySignatureRequest request = new TemporarySignatureRequest(HttpMethodEnum.PUT, huaweiObsProperties.getObs().getExpire());
            request.setBucketName(huaweiObsProperties.getObs().getBucket());
            request.setObjectKey(fileName);
            request.setHeaders(headers);
            TemporarySignatureResponse response = obsClient.createTemporarySignature(request);
            return response.getSignedUrl();
        } catch (Exception e) {
            log.error("获取上传地址异常：{}", e.getMessage(), e);
        } finally {
            huaweiObsProperties.destroy(obsClient);
        }
        return null;
    }

    /***
     * 判断对象是否存在
     * @author hongawen
     * @date 2023/3/2 13:35
     */
    public boolean judgeObjectExist(String fileName) {
        ObsClient obsClient = null;
        try {
            obsClient = huaweiObsProperties.getInstance();
            return obsClient.doesObjectExist(huaweiObsProperties.getObs().getBucket(), fileName);
        } catch (Exception e) {
            log.error("获取上传地址异常：{}", e.getMessage(), e);
        } finally {
            huaweiObsProperties.destroy(obsClient);
        }
        return false;
    }


    /***
     * 以流的形式下载文件
     * @author hongawen
     * @date 2023/3/1 20:56
     * @return InputStream
     */
    public InputStream fileDownload(String fileName) {
        ObsClient obsClient = null;
        try {
            String bucketName = huaweiObsProperties.getObs().getBucket();
            ObsObject obsObject = huaweiObsProperties.getInstance().getObject(bucketName, fileName);
            return obsObject.getObjectContent();
        } catch (ObsException e) {
            log.error("obs文件下载失败", e);
        } finally {
            huaweiObsProperties.destroy(obsClient);
        }
        return null;
    }

    /***
     * 删除指定对象
     * @author hongawen
     * @date 2023/3/1 20:36
     */
    public boolean delete(String fileName) {
        ObsClient obsClient = null;
        try {
            obsClient = huaweiObsProperties.getInstance();
            // obs删除
            obsClient.deleteObject(huaweiObsProperties.getObs().getBucket(), fileName);
        } catch (ObsException e) {
            log.error("obs删除保存失败", e);
        } finally {
            huaweiObsProperties.destroy(obsClient);
        }
        return true;
    }

    /***
     * 批量删除指定对象
     * @author hongawen
     * @date 2023/3/1 20:36
     */
    public boolean deleteBatch(List<String> fileNames) {
        ObsClient obsClient = null;
        try {
            obsClient = huaweiObsProperties.getInstance();
            DeleteObjectsRequest deleteObjectsRequest = new DeleteObjectsRequest(huaweiObsProperties.getObs().getBucket());
            // obs批量删除
            fileNames.forEach(deleteObjectsRequest::addKeyAndVersion);
            obsClient.deleteObjects(deleteObjectsRequest);
        } catch (ObsException e) {
            log.error("obs批量删除保存失败", e);
        } finally {
            huaweiObsProperties.destroy(obsClient);
        }
        return true;
    }


    /***
     * 暂时未知河北现场的桶是否固定，将多个业务文件存在一个桶内也没问题
     * 判断是否存在桶，不存在则创建通
     * @author hongawen
     * @date 2023/3/2 10:08
     */
    public void judgeBucket(ObsClient obsClient, String bucketName) {
        boolean exists = obsClient.headBucket(bucketName);
        if (!exists) {
            CreateBucketRequest request = new CreateBucketRequest();
            request.setBucketName(bucketName);
            // 设置桶访问权限为公共读，默认是私有读写
            request.setAcl(AccessControlList.REST_CANNED_PUBLIC_READ);
            // 设置桶的存储类型为归档存储
            request.setBucketStorageClass(StorageClassEnum.COLD);
            // 设置桶区域位置(以区域为华北-北京四为例)
            request.setLocation("cn-east-3");
            // 指定创建多AZ桶，如果不设置，默认创建单AZ桶
            request.setAvailableZone(AvailableZoneEnum.MULTI_AZ);
            // 创建桶
            try {
                // 创建桶成功
                ObsBucket bucket = obsClient.createBucket(request);
                log.info(bucket.getRequestId());
            } catch (ObsException e) {
                // 创建桶失败
                log.info("HTTP Code: " + e.getResponseCode());
                log.info("Error Code:" + e.getErrorCode());
                log.info("Error Message: " + e.getErrorMessage());
                log.info("Request ID:" + e.getErrorRequestId());
                log.info("Host ID:" + e.getErrorHostId());
            }
        }
    }


}