package com.xuekairui.user.controller;

import com.xuekairui.common.Result;
import com.xuekairui.user.service.OssService;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.UUID;

/**
 * 通用文件上传控制器
 * <ul>
 *   <li>POST /api/upload — 本地存储（兼容旧版）</li>
 *   <li>POST /api/upload/oss — 阿里云 OSS 存储，返回公网 URL</li>
 * </ul>
 */
@Slf4j
@RestController
@RequestMapping("/api/upload")
@RequiredArgsConstructor
public class FileUploadController {

    private final OssService ossService;

    @Value("${upload.path:/opt/uploads}")
    private String uploadPath;

    /**
     * 上传单个文件（本地存储）
     * POST /api/upload
     * Body: multipart/form-data, field: file
     *
     * @return 文件访问相对路径
     */
    @PostMapping
    public Result<String> upload(@RequestParam("file") MultipartFile file) throws IOException {
        if (file.isEmpty()) {
            return Result.error(400, "文件不能为空");
        }

        // 确保目录存在
        Path dir = Paths.get(uploadPath);
        if (!Files.exists(dir)) {
            Files.createDirectories(dir);
            log.info("创建上传目录: {}", dir.toAbsolutePath());
        }

        // 生成唯一文件名（保留扩展名）
        String originalFilename = file.getOriginalFilename();
        String extension = "";
        if (originalFilename != null && originalFilename.contains(".")) {
            extension = originalFilename.substring(originalFilename.lastIndexOf("."));
        }
        String fileName = UUID.randomUUID().toString().replace("-", "") + extension;

        // 写入文件
        Path targetPath = dir.resolve(fileName);
        file.transferTo(targetPath.toFile());

        log.info("文件上传成功: {}", targetPath.toAbsolutePath());

        // 返回可访问的相对路径
        String fileUrl = "/opt/uploads/" + fileName;
        return Result.success(fileUrl);
    }

    /**
     * 上传文件到阿里云 OSS
     * POST /api/upload/oss
     * Body: multipart/form-data, field: file
     *
     * @return 可公开访问的 OSS 文件 URL
     */
    @PostMapping("/oss")
    public Result<String> uploadToOss(@RequestParam("file") MultipartFile file) {
        if (file.isEmpty()) {
            return Result.error(400, "文件不能为空");
        }
        String fileUrl = ossService.upload(file);
        return Result.success(fileUrl);
    }
}