package com.sercurityControl.decision.service.impl;

import cn.hutool.core.util.IdUtil;
import com.sercurityControl.decision.domain.Attachment;
import com.sercurityControl.decision.mapper.AttachMapper;
import com.sercurityControl.decision.service.FileService;
import com.sercurityControl.decision.utils.OssUtil;
import org.apache.commons.codec.binary.Base64;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.ObjectUtils;
import org.springframework.util.StringUtils;
import org.springframework.web.multipart.MultipartFile;
import javax.annotation.Resource;
import javax.servlet.http.HttpServletResponse;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.util.List;

@Service
public class FileServiceImpl implements FileService {
    @Resource
    private AttachMapper attachMapper;

    @Resource
    private OssUtil ossUtil;

    @Override
    public String queryPicId(String md5) {
        String base64;
        if (!StringUtils.hasLength(md5)) {
            return null;
        }
        try {
            byte[] bytes = getBytes(md5);
            if (bytes == null){
                return null;
            }
            base64 = Base64.encodeBase64String(bytes);
            return base64;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }


    @Override
    public Attachment upload(MultipartFile file) throws Exception {
        byte[] bytes = file.getBytes();
        if (bytes.length == 0) {
            return null;
        }
        Attachment attachment = new Attachment();
        attachment.setFileName(file.getOriginalFilename());
        String md5 = ossUtil.fileUpload(file);
        if (!StringUtils.hasLength(md5)){
            return null;
        }
        attachment.setMd5(md5);
        return attachment;
    }

    @Override
    public void getFile(String md5, HttpServletResponse response) {
        Attachment riskAttachment = attachMapper.queryAttachByMd5(md5);
        fileDown(riskAttachment,response);
    }

    @Override
    public List<Attachment> getFileList(String pkVal, String colName) {
        if (!StringUtils.hasLength(pkVal)) {
            return null;
        }
        return attachMapper.getFileList(pkVal,colName);
    }

    @Override
    public Attachment getOneFile(String pkVal, String colName) {
        if (!StringUtils.hasLength(pkVal)) {
            return null;
        }
        return attachMapper.getFile(pkVal,colName);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public int insertFileList(List<Attachment> fileList,String pkVal, String tableName, String colName) {
        if (!StringUtils.hasLength(pkVal)) {
            return 0;
        }
        int j = attachMapper.deleteFileByPkValOrId(new Attachment(pkVal,colName,null));
        if (ObjectUtils.isEmpty(fileList)) {
            return Math.max(0,j);
        }
        for (int i = 0; i < fileList.size(); i++){
            fileList.get(i).setPkVal(pkVal);
            fileList.get(i).setColName(colName);
            fileList.get(i).setTableName(tableName);
            if (!StringUtils.hasLength(fileList.get(i).getMd5())) {
                fileList.remove(i);
                i--;continue;
            }
            fileList.get(i).setId(IdUtil.fastSimpleUUID());
        }
        if (ObjectUtils.isEmpty(fileList)) {
            return Math.max(0,j);
        }
        return attachMapper.insertFileList(fileList);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public int insertFile(Attachment file, String pkVal, String tableName, String colName) {
        if (!StringUtils.hasLength(pkVal)) {
            return 0;
        }
        if (ObjectUtils.isEmpty(file)) {
            return attachMapper.deleteFileByPkValOrId(new Attachment(pkVal,colName,null));
        }else {
            if (!StringUtils.hasLength(file.getMd5())) {
                return 0;
            }
            attachMapper.deleteFileByPkValOrId(new Attachment(pkVal,colName,null));
            file.setId(IdUtil.fastSimpleUUID());
            file.setPkVal(pkVal);
            file.setTableName(tableName);
            file.setColName(colName);
            return attachMapper.insertFile(file);
        }
    }


    void fileDown(Attachment riskAttachment,HttpServletResponse response){
        if (ObjectUtils.isEmpty(riskAttachment)|| !StringUtils.hasLength(riskAttachment.getMd5())) {
            return ;
        }
        String fileName = riskAttachment.getFileName();
        try {
            fileName = URLEncoder.encode(fileName, "UTF-8");
            byte[] fileContentByte = getBytes(riskAttachment.getMd5());
            if (fileContentByte == null){
                return ;
            }
            response.addHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
            OutputStream outputStream = response.getOutputStream();
            outputStream.write(fileContentByte);
            outputStream.flush();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    public byte[] getBytes(String md5) {
        return ossUtil.getFile(md5);
    }

    @Override
    public InputStream getInputStream(String md5) {
        byte[] bytes = getBytes(md5);
        return new ByteArrayInputStream(bytes);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public int deleteFileByPkValOrId(String pkVal,String id) {
        if (!StringUtils.hasLength(pkVal) && !StringUtils.hasLength(id)) {
            return 0;
        }
        return attachMapper.deleteFileByPkValOrId(new Attachment(pkVal,null,id));
    }

}