package com.agri.common.utils;


import com.agri.common.config.OSSConfig;
import com.agri.common.exception.BusinessException;
import com.aliyun.oss.OSS;
import com.aliyun.oss.common.utils.BinaryUtil;
import com.aliyun.oss.model.MatchMode;
import com.aliyun.oss.model.PolicyConditions;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;

import javax.annotation.Resource;
import java.io.InputStream;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.UUID;

@Slf4j
@Component
public class AliyunOSSUtils {

    /**
     * 图片格式
     */
    private static final String[] FILE_TYPE = new String[]{".bmp", ".jpg",
            ".jpeg", ".gif", ".png", ".mp4", ".jfif", ".ico", ".pdf"};

    @Resource
    private OSS ossClient;

    @Resource
    private OSSConfig ossConfig;

    /**
     * 图像上传
     *
     * @param uploadFile 图像流处理
     * @return 文件访问路径
     */
    public String upLoadFile(MultipartFile uploadFile) {
        return ossPutObject(uploadFile, null);
    }

    /**
     * 图像上传
     *
     * @param uploadFile 图像流处理
     * @param prefixKey  文件/对象名称的前缀,类似目录,例如:backend/
     * @return 文件访问路径
     */
    public String upLoadFile(MultipartFile uploadFile, String prefixKey) {
        return ossPutObject(uploadFile, prefixKey);
    }

    @Deprecated
    public String uploadAvatar(MultipartFile uploadFile) {
        return ossPutObject(uploadFile,null);
    }

    /**
     * 图片上传
     *
     * @param inputStream 图像流处理
     * @return 文件访问路径
     */
    @Deprecated
    public String upLoadFile(InputStream inputStream) {
        String suffix = ".png";
        //文件名
        String key = ossConfig.getPrefixKey() + UUID.randomUUID().toString()
                .replace("-", "") + suffix;
        try {
            ossClient.putObject(ossConfig.getBucketName(), key, inputStream);
            inputStream.close();
            log.info("--------图片上传成功--------");
        } catch (Exception e) {
            log.info("oos上传失败:" + e.getMessage());
            throw new BusinessException("图片上传失败");
        }
        //返回文件访问路径
        return key;
    }

    /**
     * 图片上传
     *
     * @param inputStream 图像流处理
     * @return 文件访问路径
     */
    public String upLoadOtherFile(InputStream inputStream, String filename) {
        String suffix = filename.substring(filename.lastIndexOf("."));
        //文件名
        String key = ossConfig.getPrefixKey() + UUID.randomUUID().toString()
                .replace("-", "") + suffix;
        try {
            ossClient.putObject(ossConfig.getBucketName(), key, inputStream);
            inputStream.close();
        } catch (Exception e) {
            log.error("oos上传失败:{}", e.getMessage());
            throw new BusinessException("文件上传失败");
        }
        //返回文件访问路径
        return key;
    }

    /**
     * 校验文件后缀
     *
     * @param suffix 文件后缀
     * @return
     */
    private void verifySuffix(String suffix) {
        // 校验文件格式
        for (String type : FILE_TYPE) {
            if (type.equalsIgnoreCase(suffix)) {
                return;
            }
        }
        throw new BusinessException("暂不支持此格式的文件");
    }

    /**
     * 获取签名
     *
     * @return
     */
    public Map<String, String> getSign() {
        String accessId = ossConfig.getAccessKeyId(); // 请填写您的AccessKeyId。
        String endpoint = ossConfig.getEndpoint(); // 请填写您的 endpoint。
        String bucket = ossConfig.getBucketName(); // 请填写您的 bucketname 。
        String host = "https://" + bucket + "." + endpoint; // host的格式为 bucketname.endpoint
        String dir = ossConfig.getPrefixKey(); // 用户上传文件时指定的前缀。

        try {
            long expireTime = 180;//60秒
            long expireEndTime = System.currentTimeMillis() + expireTime * 1000;
            Date expiration = new Date(expireEndTime);
            PolicyConditions policyConds = new PolicyConditions();
            policyConds.addConditionItem(PolicyConditions.COND_CONTENT_LENGTH_RANGE, 0, 1048576000);
            policyConds.addConditionItem(MatchMode.StartWith, PolicyConditions.COND_KEY, dir);

            String postPolicy = ossClient.generatePostPolicy(expiration, policyConds);
            byte[] binaryData = postPolicy.getBytes("utf-8");
            String encodedPolicy = BinaryUtil.toBase64String(binaryData);
            String postSignature = ossClient.calculatePostSignature(postPolicy);

            Map<String, String> respMap = new LinkedHashMap<>();
            respMap.put("accessid", accessId);
            respMap.put("policy", encodedPolicy);
            respMap.put("signature", postSignature);
            respMap.put("dir", dir);
            respMap.put("host", host);
            respMap.put("expire", String.valueOf(expireEndTime / 1000));

            return respMap;

        } catch (Exception e) {
            // Assert.fail(e.getMessage());
            System.out.println(e.getMessage());
            throw new BusinessException("获取签名失败");
        }
    }

    /**
     * oss 文件上传并获得访问路径
     *
     * @param uploadFile 需要上传的文件
     * @param prefixKey  文件/对象名称的前缀,类似目录 例如:backend/
     * @return
     */
    private String ossPutObject(MultipartFile uploadFile, String prefixKey) {

        //获取文件名称
        String originalFilename = uploadFile.getOriginalFilename();
        //文件后缀
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        verifySuffix(suffix);
        long size = uploadFile.getSize();
        if (size > ossConfig.getMaxSize()) {
            throw new BusinessException("文件超出大小限制");
        }
        //前缀,类似目录
        if (StringUtils.isBlank(prefixKey)) {
            prefixKey = ossConfig.getPrefixKey();
        }
        //文件路径=prefixKey+文件名称
        String key = prefixKey + UUID.randomUUID().toString()
                .replace("-", "") + suffix;
        try {
            InputStream inputStream = uploadFile.getInputStream();
            ossClient.putObject(ossConfig.getBucketName(), key, inputStream);
            inputStream.close();
            log.info("--------文件上传成功--------");
        } catch (Exception e) {
            log.error("oos上传失败:", e);
            throw new BusinessException("图片上传失败");
        }
        //返回文件访问路径
        return key;
    }

}