package com.doc.biz.controller;

import cn.hutool.http.HttpUtil;
import com.doc.biz.service.IMongoService;
import com.doc.biz.vo.DocumentVO;
import com.doc.common.core.controller.BaseController;
import com.doc.common.core.domain.AjaxResult;
import com.doc.system.service.ISysConfigService;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import org.yaml.snakeyaml.util.UriEncoder;

import javax.annotation.Resource;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.util.HashMap;
import java.util.Objects;

/**
 * 文件上传
 *
 * @author wukai
 * @date 2023-08-15
 */
@Slf4j
@Api(tags = "通用接口")
@RestController
@RequestMapping("/api")
public class ApiController extends BaseController {

    /**
     * 文件上传实现类
     */
    @Resource
    private IMongoService mongoService;
    @Resource
    private ISysConfigService configService;

    /**
     * 文件下载
     *
     * @param fileId fileId
     * @return
     */
    @ApiOperation("文件预览")
    @GetMapping("/access/{fileId}")
    public ResponseEntity<Object> access(@PathVariable(name = "fileId") String fileId) {
        return down(fileId, false);
    }

    /**
     * 文件下载
     *
     * @param fileId fileId
     * @return
     */
    @ApiOperation("文件下载")
    @GetMapping("/download/{fileId}")
    public ResponseEntity<Object> download(@PathVariable(name = "fileId") String fileId) {
        return down(fileId, true);
    }

    private ResponseEntity<Object> down(String fileId, boolean down) {
        DocumentVO vo = mongoService.downloadFile(fileId);
        if (Objects.nonNull(vo)) {
            String disposition = down ? "attachment" : "inline";
            disposition += "; filename=\"" + UriEncoder.encode(vo.getFileName()) + "\"";
            return ResponseEntity.ok()
                    .header(HttpHeaders.CONTENT_DISPOSITION, disposition)
                    .header(HttpHeaders.CONTENT_TYPE, vo.getContentType())
                    .header(HttpHeaders.CONTENT_LENGTH, vo.getFileSize() + "")
                    .header("Connection", "close")
                    .body(vo.getData());
        } else {
            return ResponseEntity.status(HttpStatus.NOT_FOUND).body("file does not exist");
        }
    }

    /**
     * 文字识别
     *
     * @param fileId fileId
     * @return
     */
    @ApiOperation("文字识别-通过fileId")
    @GetMapping("/ocr/{fileId}")
    public AjaxResult ocr(@PathVariable(name = "fileId") String fileId) {
        DocumentVO vo = mongoService.downloadFile(fileId);
        try {
            File upFile = File.createTempFile(vo.getFileName(), vo.getSuffix() + ".");
            Files.write(upFile.toPath(), vo.getData());
            String result = callPythonOcrApi(upFile);
            return success(result);
        } catch (IOException e) {
            return error(e.getMessage());
        }
    }


    /**
     * 文字识别
     *
     * @param file 文件
     * @return
     */
    @ApiOperation("文字识别-上传图片")
    @PostMapping("/upload")
    public AjaxResult ocr(@RequestParam(value = "file") MultipartFile file) {
        try {
            //选择用缓冲区来实现这个转换即使用java 创建的临时文件 使用 MultipartFile.transferto()方法 。
            String originalFilename = file.getOriginalFilename();
            String[] filename = originalFilename.split("\\.");
            File upFile = File.createTempFile(filename[0], filename[1] + ".");
            file.transferTo(upFile);
            String result = callPythonOcrApi(upFile);
            return success(result);
        } catch (Exception e) {
            return error(e.getMessage());
        }
    }

    /**
     * 调用python接口获取结果
     *
     * @param file 文件
     * @return 识别结果
     */
    private String callPythonOcrApi(File file) {
        HashMap<String, Object> map = new HashMap<>(3);
        map.put("file", file);
        String uri = configService.selectConfigByKey("api.ocr.uri");
        String result = HttpUtil.post(uri, map);
        try {
            Files.delete(file.toPath());
        } catch (IOException e) {
        }
        return result;
    }
}