package com.zxyj.service.impl;

import com.zxyj.service.StorageService;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.UUID;

@Service
public class LocalDiskStorageService implements StorageService {

    @Value("${file.upload-dir:./uploads}")
    private String uploadDir;

    @Override
    public String storeFile(MultipartFile file) {
        try {
            // 生成日期路径：uploads/2026/04/05/
            String datePath = LocalDate.now().format(DateTimeFormatter.ofPattern("yyyy/MM/dd"));
            Path uploadPath = Paths.get(uploadDir, datePath);

            // 创建目录
            if (!Files.exists(uploadPath)) {
                Files.createDirectories(uploadPath);
            }

            // 生成唯一文件名
            String originalFilename = file.getOriginalFilename();
            String extension = "";
            if (originalFilename != null && originalFilename.contains(".")) {
                extension = originalFilename.substring(originalFilename.lastIndexOf("."));
            }
            String filename = UUID.randomUUID().toString() + extension;

            // 保存文件
            Path filePath = uploadPath.resolve(filename);
            file.transferTo(filePath.toFile());

            // 返回相对URL路径
            return "/" + datePath + "/" + filename;
        } catch (IOException e) {
            throw new RuntimeException("文件存储失败", e);
        }
    }

    @Override
    public void deleteFile(String fileUrl) {
        if (fileUrl == null || fileUrl.isEmpty()) {
            return;
        }
        try {
            Path filePath = Paths.get(uploadDir, fileUrl);
            Files.deleteIfExists(filePath);
        } catch (IOException e) {
            // 记录日志但不抛出异常
            System.err.println("删除文件失败: " + fileUrl);
        }
    }

    @Override
    public String getFilePath(String filename) {
        return Paths.get(uploadDir, filename).toString();
    }
}