package ieven.server.webapp.api;

import com.mongodb.client.gridfs.model.GridFSFile;
import ieven.server.webapp.domain.file.FileListInput;
import ieven.server.webapp.domain.file.FileService;
import ieven.server.webapp.domain.file.LogicalFile;
import ieven.server.webapp.infrastructure.wrapper.Mapped;
import ieven.server.webapp.model.UploadedFile;
import ieven.server.webapp.model.display.UploadedFileDisplay;
import ieven.server.webapp.util.Common;
import ieven.server.webapp.util.Properties;
import io.swagger.annotations.Api;
import org.apache.commons.lang3.StringUtils;
import org.bson.types.ObjectId;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.data.mongodb.gridfs.GridFsOperations;
import org.springframework.data.mongodb.gridfs.GridFsTemplate;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.logging.Logger;

@RestController
@RequestMapping("/file")
@Api(value = "文件操作接口")
public class FileController {
    private final Logger logger = Logger.getLogger("UploadController");
    @Autowired
    private GridFsOperations gridFsOperations;
    @Autowired
    private MongoTemplate mongoTemplate;
    @Autowired
    private FileService fileService;

    //上传文件
    @PostMapping("/uploadSingle")
    public Mapped uploadSingle(@RequestParam MultipartFile file, @RequestParam String modelId) {
        //异步读取数据并存储到mongo
        return fileService.storeUploaded(file, modelId);
    }

    //列出已上传文件
    @PostMapping("/uploadedList")
    public Mapped listUploaded(@RequestBody FileListInput fileListInput) {
        return fileService.listUploaded(fileListInput);
    }

    //删除已上传的文件
    @PostMapping("/deleteUploaded")
    public Map<String, Object> deleteUploaded(@RequestBody Map<String, Object> jsonMap) {
        String fileId = (String) jsonMap.getOrDefault("id", "");
        if (StringUtils.isBlank(fileId)) {
            return Common.errorMapWithPage("未找到参数");
        }
        Query queryUploaded = new Query(Criteria.where("_id").is(new ObjectId(fileId)));
        mongoTemplate.remove(queryUploaded, Properties.COLLECTION_UPLOADED);
        Query queryData = new Query(Criteria.where("fileId").is(fileId));
        mongoTemplate.remove(queryData, Properties.COLLECTION_DATA);
        gridFsOperations.delete(queryUploaded);
        Map<String, Object> res = new HashMap<>();
        res.put("code", 200);
        res.put("result", "");
        return res;
    }


    @GetMapping("/downloadById")
    public void downloadById(HttpServletRequest request, HttpServletResponse response, @RequestBody Map<String, Object> jsonMap) {
        String fileId = (String) jsonMap.getOrDefault("id", "");
        GridFSFile gridFSFile = gridFsOperations.findOne(new Query(Criteria.where("_id").is(new ObjectId(fileId))));
        if (gridFSFile == null) {
            return;
        }
        String filename = gridFSFile.getFilename();
        try {
            response.setHeader("Content-Type", "multipart/form-data");
            //设置下载的文件的名称-该方式已解决中文乱码问题
            response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes(StandardCharsets.UTF_8), StandardCharsets.ISO_8859_1));
            response.setHeader("Content-Length", String.valueOf(gridFSFile.getLength()));
            OutputStream out = response.getOutputStream();
            InputStream input = gridFsOperations.getResource(gridFSFile).getInputStream();
            byte[] b = new byte[2048];
            int len;
            while ((len = input.read(b)) != -1) {
                out.write(b, 0, len);
            }
            input.close();
        } catch (IOException e) {
            logger.info("下载文件失败:" + filename);
            e.printStackTrace();
        }
    }
}