/*
Copyright [2020] [https://www.xiaonuo.vip]

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

  http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

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 */
package vip.xiaonuo.core.file.modular.tencent;

import cn.hutool.core.io.IoUtil;
import com.qcloud.cos.COSClient;
import com.qcloud.cos.ClientConfig;
import com.qcloud.cos.auth.BasicCOSCredentials;
import com.qcloud.cos.auth.COSCredentials;
import com.qcloud.cos.exception.CosClientException;
import com.qcloud.cos.exception.CosServiceException;
import com.qcloud.cos.http.HttpMethodName;
import com.qcloud.cos.model.*;
import com.qcloud.cos.region.Region;
import com.qcloud.cos.transfer.TransferManager;
import com.qcloud.cos.transfer.TransferManagerConfiguration;
import vip.xiaonuo.core.file.FileOperator;
import vip.xiaonuo.core.file.common.enums.BucketAuthEnum;
import vip.xiaonuo.core.file.modular.tencent.exp.TencentFileServiceException;
import vip.xiaonuo.core.file.modular.tencent.prop.TenCosProperties;

import javax.activation.MimetypesFileTypeMap;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.net.URL;
import java.util.Date;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * 腾讯云内网文件操作
 *
 * @author xuyuxiang
 * @date 2020-05-22-6:51 下午
 */
public class TenFileOperator implements FileOperator {

    private final TenCosProperties tenCosProperties;

    private COSClient cosClient;

    private TransferManager transferManager;

    public TenFileOperator(TenCosProperties tenCosProperties) {
        this.tenCosProperties = tenCosProperties;
        initClient();
    }

    @Override
    public void initClient() {

        // 1.初始化用户身份信息
        String secretId = tenCosProperties.getSecretId();
        String secretKey = tenCosProperties.getSecretKey();
        COSCredentials cred = new BasicCOSCredentials(secretId, secretKey);

        // 2.设置 bucket 的区域, COS 地域的简称请参照 https://cloud.tencent.com/document/product/436/6224
        Region region = new Region(tenCosProperties.getRegionId());
        ClientConfig clientConfig = new ClientConfig(region);

        // 3.生成 cos 客户端。
        cosClient = new COSClient(cred, clientConfig);

        // 4.线程池大小，建议在客户端与 COS 网络充足（例如使用腾讯云的 CVM，同地域上传 COS）的情况下，设置成16或32即可，可较充分的利用网络资源
        // 对于使用公网传输且网络带宽质量不高的情况，建议减小该值，避免因网速过慢，造成请求超时。
        ExecutorService threadPool = Executors.newFixedThreadPool(32);

        // 5.传入一个 threadpool, 若不传入线程池，默认 TransferManager 中会生成一个单线程的线程池。
        transferManager = new TransferManager(cosClient, threadPool);

        // 6.设置高级接口的分块上传阈值和分块大小为10MB
        TransferManagerConfiguration transferManagerConfiguration = new TransferManagerConfiguration();
        transferManagerConfiguration.setMultipartUploadThreshold(10 * 1024 * 1024);
        transferManagerConfiguration.setMinimumUploadPartSize(10 * 1024 * 1024);
        transferManager.setConfiguration(transferManagerConfiguration);
    }

    @Override
    public void destroyClient() {
        cosClient.shutdown();
    }

    @Override
    public Object getClient() {
        return cosClient;
    }

    @Override
    public boolean doesBucketExist(String bucketName) {
        try {
            return cosClient.doesBucketExist(bucketName);
        } catch (CosServiceException e) {
            throw new TencentFileServiceException(e);
        } catch (CosClientException e) {
            throw new TencentFileServiceException(e);
        }
    }

    @Override
    public void setBucketAcl(String bucketName, BucketAuthEnum bucketAuthEnum) {
        try {
            if (bucketAuthEnum.equals(BucketAuthEnum.PRIVATE)) {
                cosClient.setBucketAcl(bucketName, CannedAccessControlList.Private);
            } else if (bucketAuthEnum.equals(BucketAuthEnum.PUBLIC_READ)) {
                cosClient.setBucketAcl(bucketName, CannedAccessControlList.PublicRead);
            } else if (bucketAuthEnum.equals(BucketAuthEnum.PUBLIC_READ_WRITE)) {
                cosClient.setBucketAcl(bucketName, CannedAccessControlList.PublicReadWrite);
            }
        } catch (CosServiceException e) {
            throw new TencentFileServiceException(e);
        } catch (CosClientException e) {
            throw new TencentFileServiceException(e);
        }
    }

    @Override
    public boolean isExistingFile(String bucketName, String key) {
        try {
            cosClient.getObjectMetadata(bucketName, key);
            return true;
        } catch (CosServiceException e) {
            return false;
        }
    }

    @Override
    public void storageFile(String bucketName, String key, byte[] bytes) {
        // 根据文件名获取contentType
        String contentType = "application/octet-stream";
        if (key.contains(".")) {
            contentType = MimetypesFileTypeMap.getDefaultFileTypeMap().getContentType(key);
        }

        // 上传文件
        ByteArrayInputStream byteArrayInputStream = null;
        try {
            byteArrayInputStream = new ByteArrayInputStream(bytes);
            ObjectMetadata objectMetadata = new ObjectMetadata();
            objectMetadata.setContentType(contentType);
            cosClient.putObject(bucketName, key, new ByteArrayInputStream(bytes), objectMetadata);
        } catch (CosServiceException e) {
            throw new TencentFileServiceException(e);
        } catch (CosClientException e) {
            throw new TencentFileServiceException(e);
        } finally {
            IoUtil.close(byteArrayInputStream);
        }

    }

    @Override
    public void storageFile(String bucketName, String key, InputStream inputStream) {

        // 根据文件名获取contentType
        String contentType = "application/octet-stream";
        if (key.contains(".")) {
            contentType = MimetypesFileTypeMap.getDefaultFileTypeMap().getContentType(key);
        }

        // 上传文件
        try {
            ObjectMetadata objectMetadata = new ObjectMetadata();
            objectMetadata.setContentType(contentType);
            cosClient.putObject(bucketName, key, inputStream, objectMetadata);
        } catch (CosServiceException e) {
            throw new TencentFileServiceException(e);
        } catch (CosClientException e) {
            throw new TencentFileServiceException(e);
        } finally {
            IoUtil.close(inputStream);
        }
    }

    @Override
    public byte[] getFileBytes(String bucketName, String key) {
        COSObjectInputStream cosObjectInput = null;
        try {
            GetObjectRequest getObjectRequest = new GetObjectRequest(bucketName, key);
            COSObject cosObject = cosClient.getObject(getObjectRequest);
            cosObjectInput = cosObject.getObjectContent();
            return IoUtil.readBytes(cosObjectInput);
        } catch (CosServiceException e) {
            throw new TencentFileServiceException(e);
        } catch (CosClientException e) {
            throw new TencentFileServiceException(e);
        } finally {
            IoUtil.close(cosObjectInput);
        }
    }

    @Override
    public void setFileAcl(String bucketName, String key, BucketAuthEnum bucketAuthEnum) {
        if (bucketAuthEnum.equals(BucketAuthEnum.PRIVATE)) {
            cosClient.setObjectAcl(bucketName, key, CannedAccessControlList.Private);
        } else if (bucketAuthEnum.equals(BucketAuthEnum.PUBLIC_READ)) {
            cosClient.setObjectAcl(bucketName, key, CannedAccessControlList.PublicRead);
        } else if (bucketAuthEnum.equals(BucketAuthEnum.PUBLIC_READ_WRITE)) {
            cosClient.setObjectAcl(bucketName, key, CannedAccessControlList.PublicReadWrite);
        }
    }

    @Override
    public void copyFile(String originBucketName, String originFileKey, String newBucketName, String newFileKey) {
        // 初始化拷贝参数
        Region srcBucketRegion = new Region(tenCosProperties.getRegionId());
        CopyObjectRequest copyObjectRequest = new CopyObjectRequest(
                srcBucketRegion, originBucketName, originFileKey, newBucketName, newFileKey);

        // 拷贝对象
        try {
            transferManager.copy(copyObjectRequest, cosClient, null);
        } catch (CosServiceException e) {
            throw new TencentFileServiceException(e);
        } catch (CosClientException e) {
            throw new TencentFileServiceException(e);
        }
    }

    @Override
    public String getFileAuthUrl(String bucketName, String key, Long timeoutMillis) {
        GeneratePresignedUrlRequest presignedUrlRequest = new GeneratePresignedUrlRequest(bucketName, key, HttpMethodName.GET);
        Date expirationDate = new Date(System.currentTimeMillis() + timeoutMillis);
        presignedUrlRequest.setExpiration(expirationDate);
        URL url = null;
        try {
            url = cosClient.generatePresignedUrl(presignedUrlRequest);
        } catch (CosServiceException e) {
            throw new TencentFileServiceException(e);
        } catch (CosClientException e) {
            throw new TencentFileServiceException(e);
        }
        return url.toString();
    }

    @Override
    public void deleteFile(String bucketName, String key) {
        cosClient.deleteObject(bucketName, key);
    }

}