package com.fdkankan.fusion.common.util;

import com.aliyun.oss.OSSClient;
import com.aliyun.oss.model.GetObjectRequest;
import com.fdkankan.fusion.config.MinIOConfig;
import com.fdkankan.fusion.response.FileInfoVo;
import io.minio.*;
import io.minio.messages.Item;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.util.ObjectUtils;

import javax.annotation.PostConstruct;
import javax.annotation.Resource;
import java.io.InputStream;
import java.time.ZonedDateTime;
import java.util.Date;
import java.util.List;

@Slf4j
@Service
public class MinIoUploadService {
    @Resource
    private MinIOConfig minIOConfig;

    private MinioClient minioClient;

    private String endpoint;
    private String bucketName;
    private String accessKey;
    private String secretKey;
    private Integer imgSize;
    private Integer fileSize;


    private final String SEPARATOR = "/";

    @PostConstruct
    public void init() {
        this.endpoint = minIOConfig.getEndpoint();
        this.bucketName = minIOConfig.getBucketName();
        this.accessKey = minIOConfig.getAccessKey();
        this.secretKey = minIOConfig.getSecretKey();
        createMinioClient();
    }

    /**
     * 创建基于Java端的MinioClient
     */
    public void createMinioClient() {
        try {
            if (null == minioClient) {
                log.info("开始创建 MinioClient...");
                minioClient = MinioClient
                        .builder()
                        .endpoint(endpoint)
                        .credentials(accessKey, secretKey)
                        .build();
                createBucket(bucketName);
                log.info("创建完毕 MinioClient...");
            }
        } catch (Exception e) {
            log.error("MinIO服务器异常：{}", e);
        }
    }

    /**
     * 启动SpringBoot容器的时候初始化Bucket
     * 如果没有Bucket则创建
     *
     * @throws Exception
     */
    private void createBucket(String bucketName) throws Exception {
        if (!bucketExists(bucketName)) {
            minioClient.makeBucket(MakeBucketArgs.builder().bucket(bucketName).build());
        }
    }

    /**
     * 判断Bucket是否存在，true：存在，false：不存在
     *
     * @return
     * @throws Exception
     */
    public boolean bucketExists(String bucketName) throws Exception {
        return minioClient.bucketExists(BucketExistsArgs.builder().bucket(bucketName).build());
    }

    /**
     * 获得Bucket的策略
     *
     * @param bucketName
     * @return
     * @throws Exception
     */
    public String getBucketPolicy(String bucketName) throws Exception {
        String bucketPolicy = minioClient
                .getBucketPolicy(
                        GetBucketPolicyArgs
                                .builder()
                                .bucket(bucketName)
                                .build()
                );
        return bucketPolicy;
    }

    /**
     * 判断文件是否存在
     *
     * @param bucketName 存储桶
     * @param objectName 文件名
     * @return
     */
    public boolean isObjectExist(String bucketName, String objectName) {
        boolean exist = true;
        try {
            minioClient.statObject(StatObjectArgs.builder().bucket(bucketName).object(objectName).build());
        } catch (Exception e) {
            exist = false;
        }
        return exist;
    }

    public boolean isObjectExist(String objectName) {
        return isObjectExist(bucketName,objectName);
    }


    /**
     * 判断文件夹是否存在
     *
     * @param bucketName 存储桶
     * @param objectName 文件夹名称
     * @return
     */
    public boolean isFolderExist(String bucketName, String objectName) {
        boolean exist = false;
        try {
            Iterable<Result<Item>> results = minioClient.listObjects(
                    ListObjectsArgs.builder().bucket(bucketName).prefix(objectName).recursive(false).build());
            for (Result<Item> result : results) {
                Item item = result.get();
                if (item.isDir() && objectName.equals(item.objectName())) {
                    exist = true;
                }
            }
        } catch (Exception e) {
            exist = false;
        }
        return exist;
    }

    public boolean isFolderExist( String objectName) {
        return isFolderExist(bucketName,objectName);
    }

    /**
     * 获取路径下文件列表
     *
     * @param bucketName 存储桶
     * @param prefix     文件名称
     * @param recursive  是否递归查找，false：模拟文件夹结构查找
     * @return 二进制流
     */
    public Iterable<Result<Item>> listObjects(String bucketName, String prefix,
                                              boolean recursive) {
        return minioClient.listObjects(
                ListObjectsArgs.builder()
                        .bucket(bucketName)
                        .prefix(prefix)
                        .recursive(recursive)
                        .build());
    }

    /**
     * 获取文件流
     *
     * @param bucketName 存储桶
     * @param objectName 文件名
     * @return 二进制流
     */
    public InputStream getObject(String bucketName, String objectName) throws Exception {
        return minioClient.getObject(GetObjectArgs.builder().bucket(bucketName).object(objectName).build());
    }

    public InputStream getObject( String objectName)  {
        try {
            return minioClient.getObject(GetObjectArgs.builder().bucket(bucketName).object(objectName).build());
        }catch (Exception e){
            log.info("minio获取文件失败：{}",objectName,e);
        }
        return null;
    }



    /**
     * 获取文件信息, 如果抛出异常则说明文件不存在
     *
     * @param bucketName 存储桶
     * @param objectName 文件名称
     */
    public FileInfoVo getFileStatusInfo(String bucketName, String objectName) throws Exception {

        StatObjectResponse statObjectResponse = minioClient.statObject(
                StatObjectArgs.builder()
                        .bucket(bucketName)
                        .object(objectName)
                        .build());
        String md5 = statObjectResponse.etag().toUpperCase();
        ZonedDateTime zonedDateTime = statObjectResponse.lastModified();
        Date LastMo = Date.from(zonedDateTime.toInstant());
        Long size = statObjectResponse.size();

        InputStream inputStream = getObject(bucketName, objectName);
        String sha1 = MD5Checksum.getSHA1(inputStream);
        return new FileInfoVo(md5,sha1.toUpperCase(),LastMo.getTime(),size);

    }
    public FileInfoVo getFileStatusInfo( String objectName)  {
        try {
            return getFileStatusInfo(bucketName,objectName);
        }catch (Exception e){
            log.info("获取文件失败或文件不存在:{},{}",bucketName,objectName,e);
        }
         return null;
    }


    public Long getSize(String filePath){
        Long total = 0L;
        try {
            Iterable<Result<Item>> results = listObjects(bucketName, filePath, true);
            if (ObjectUtils.isEmpty(results)) {
                return 0L;
            }
            for (Result<Item> result : results) {
                Item item = result.get();
                long size = item.size();
                total += size;
            }

        }catch (Exception e){
            log.info("oss-getFileInfo-error:{}",e);
        }
        return total;
    }


}