package com.ymwk.icvp.signature.controller;

import com.ymwk.icvp.component.PageParam;
import com.ymwk.icvp.component.PageResult;
import com.ymwk.icvp.component.ResponseDTO;
import com.ymwk.icvp.signature.entity.Picture;
import com.ymwk.icvp.signature.mapper.PictureMapper;
import com.ymwk.icvp.signature.model.PictureGenerateRequest;
import com.ymwk.icvp.signature.model.PictureListRequest;
import com.ymwk.icvp.signature.service.PictureService;
import com.ymwk.icvp.signature.service.impl.SealGenerateService;
import com.ymwk.icvp.utils.MinioClientService;
import com.ymwk.icvp.utils.MinioConfig;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.mock.web.MockMultipartFile;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@RestController
@RequestMapping("/api/v1/pictures")
public class PictureController {

    @Autowired
    private  PictureService pictureService;
    @Autowired
    private PictureMapper pictureMapper;
    @Autowired
    private  SealGenerateService sealGenerateService;
    @Autowired
    private  MinioClientService minioClientService;
    @Autowired
    private MinioConfig minioConfig;





    //印模列表
    @PostMapping("/list")
    public ResponseDTO<PageResult<Picture>> getPictureList(@RequestBody PictureListRequest pictureListRequest) {
        return pictureService.getPictureList(pictureListRequest);
    }
    //生成印模图片并上传到MinIO
    @ResponseBody
    @RequestMapping("/generate")
    public ResponseDTO<Map<String, String>> generateSeal(
            @RequestBody PictureGenerateRequest request
    ) throws Exception {

        // 1. 生成图片
        BufferedImage image = sealGenerateService.generate(request);

        // 2. 将BufferedImage转换为MultipartFile
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ImageIO.write(image, "png", baos);
        baos.flush();
        byte[] imageBytes = baos.toByteArray();
        baos.close();

        // 创建MultipartFile对象
        MultipartFile multipartFile = new MockMultipartFile(
                "seal.png",
                "seal.png",
                "image/png",
                imageBytes
        );

        // 3. 上传到MinIO
        String fileName = minioClientService.uploadFile(multipartFile);

        // 4. 生成下载链接
        String downloadUrl = minioConfig.getEndpoint() + "/" +
                minioConfig.getBucketName() + "/" +
                fileName;


        Picture picture = new Picture();
        picture.setName(request.getName() != null && !request.getName().isEmpty()
                ? request.getName() : fileName);
        picture.setUrl(downloadUrl);
        picture.setCreateTime(new Date());
        pictureMapper.insert(picture);   // 或 pictureService.save(picture)

        // 5. 返回下载链接
        Map<String, String> response = new HashMap<>();
        response.put("downloadUrl", downloadUrl);
        return ResponseDTO.ok(response);
    }
    //下载印模图片
    //TODO 下载出来0kb的空文件
    @GetMapping("/download")
    public void downloadSeal(@RequestParam String fileName, HttpServletResponse response) {
        try (InputStream is = minioClientService.downloadFile(fileName);
             OutputStream os = response.getOutputStream()) {

            response.setContentType("application/octet-stream");
            response.setHeader("Content-Disposition",
                    "attachment; filename=\"" + URLEncoder.encode(fileName, StandardCharsets.UTF_8) + "\"");

            byte[] buffer = new byte[8192];
            int len;
            while ((len = is.read(buffer)) != -1) {
                os.write(buffer, 0, len);
            }
            os.flush();
        } catch (Exception e) {
            response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
        }
    }
    //删除印模图片
    @PostMapping("/delete")
    public ResponseDTO<String> deleteSeal(@RequestParam Integer id) {


            return pictureService.deletePicture(id);

    }

}