src/main/java/com/pt/controller/ResourceController.java

package com.pt.controller;

import com.pt.constant.Constants;
import com.pt.entity.Resource;
import com.pt.entity.User;
import com.pt.service.ResourceService;
import com.pt.service.UserService;
import com.pt.utils.JWTUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.io.File;

@RestController
@RequestMapping("/api/resource")
@CrossOrigin(origins = "*")
public class ResourceController {

    @Autowired
    private ResourceService resourceService;
    private UserService userService;

    @GetMapping("/list/all")
    public ResponseEntity<?> getAllResources(@RequestHeader("token") String token,
                                             @RequestParam("username") String username) {
        Map<String, Object> ans = new HashMap<>();

        if(!JWTUtils.checkToken(token, username, Constants.UserRole.USER)){
            ans.put("result", "Invalid token");
            return ResponseEntity.badRequest().body(ans);
        }

        List<Resource> resources = resourceService.getAllResources();
        if (resources.isEmpty()) {
            return ResponseEntity.noContent().build();
        }
        return ResponseEntity.ok(resources);
    }

    @GetMapping("/list/user")
    public ResponseEntity<?> getUserResources(@RequestHeader("token") String token,
                                              @RequestParam("username") String username) {
        Map<String, Object> ans = new HashMap<>();

        if(!JWTUtils.checkToken(token, username, Constants.UserRole.USER)){
            ans.put("result", "Invalid token");
            return ResponseEntity.badRequest().body(ans);
        }

        List<Resource> resources = resourceService.getResourcesByAuthor(username);
        if (resources.isEmpty()) {
            return ResponseEntity.noContent().build();
        }
        return ResponseEntity.ok(resources);
    }

    @PostMapping("/publish")
    public ResponseEntity<?> publishResource(
            @RequestHeader("token") String token,
            @RequestParam("username") String username,
            @RequestParam("size") double size,
            @RequestParam("name") String name,
            @RequestParam("description") String description,
            @RequestParam("torrent") MultipartFile torrentFile) {

        Map<String, Object> ans = new HashMap<>();

        if (!JWTUtils.checkToken(token, username, Constants.UserRole.USER)) {
            ans.put("result", "Invalid token");
            return ResponseEntity.badRequest().body(ans);
        }

        User user = userService.findByUsername(username);
        if (user == null || user.getLevel() < 2) {
            ans.put("result", "Insufficient permissions to publish resources");
            return ResponseEntity.status(403).body(ans);
        }

        try {
            // 传入种子文件字节，同时传入资源其他信息
            resourceService.publishResource(name, description, username, size, torrentFile.getBytes());
        } catch (Exception e) {
            ans.put("result", "Failed to publish resource: " + e.getMessage());
            return ResponseEntity.status(500).body(ans);
        }

        ans.put("result", "Resource published successfully");
        return ResponseEntity.ok(ans);
    }




    @GetMapping("/get/{resourceId}")
    public ResponseEntity<?> getResourceById(@PathVariable("resourceId") int resourceId,
                                              @RequestHeader("token") String token,
                                              @RequestParam("username") String username) {

        Map<String, Object> ans = new HashMap<>();
        if(!JWTUtils.checkToken(token, username, Constants.UserRole.USER)) {
            ans.put("result", "Invalid token");
            return ResponseEntity.badRequest().body(ans);
        }

        Resource resource = resourceService.getResourceById(resourceId);
        if (resource == null) {
            return ResponseEntity.notFound().build();
        }
        return ResponseEntity.ok(resource);
    }

    @GetMapping("/download/{resourceId}")
    public ResponseEntity<?> downloadResource(@PathVariable("resourceId") int resourceId,
                                              @RequestHeader("token") String token,
                                              @RequestParam("username") String username) throws IOException {

        Map<String, Object> ans = new HashMap<>();
        if(!JWTUtils.checkToken(token, username, Constants.UserRole.USER)) {
            ans.put("result", "Invalid token");
            return ResponseEntity.badRequest().body(ans);
        }

        Resource resource = resourceService.getResourceById(resourceId);
        byte[] file = resourceService.getTorrentFileByResource(resource, username);
        if (file == null) {
            return ResponseEntity.notFound().build();
        }

        return ResponseEntity.ok()
                .header("Content-Type", "application/x-bittorrent")
                .header("Content-Disposition", "attachment; filename=\"" + resource.getName() + ".torrent\"")
                .body(file);
    }

    @GetMapping("/search")
    public ResponseEntity<?> searchResources(@RequestHeader("token") String token,
                                             @RequestParam("username") String username,
                                             @RequestParam("query") String query) {
        Map<String, Object> ans = new HashMap<>();

        if(!JWTUtils.checkToken(token, username, Constants.UserRole.USER)){
            ans.put("result", "Invalid token");
            return ResponseEntity.badRequest().body(ans);
        }

        List<Resource> resources = resourceService.searchByQuery(query);
        if (resources.isEmpty()) {
            return ResponseEntity.noContent().build();
        }
        return ResponseEntity.ok(resources);
    }

    @GetMapping("/delete")
    public ResponseEntity<?> deleteResource(@RequestHeader("token") String token,
                                            @RequestParam("username") String username,
                                            @RequestParam("resourceId") int resourceId) {
        Map<String, Object> ans = new HashMap<>();
        Resource resource = resourceService.getResourceById(resourceId);

        if(!JWTUtils.checkToken(token, username, Constants.UserRole.ADMIN) || resource == null || !resource.getAuthor().equals(username)) {
            ans.put("result", "Invalid token or insufficient permissions");
            return ResponseEntity.badRequest().body(ans);
        }

        try {
            resourceService.deleteResource(resourceId);
        } catch (Exception e) {
            ans.put("result", "Failed to delete resource: " + e.getMessage());
            return ResponseEntity.status(500).body(ans);
        }

        ans.put("result", "Resource deleted successfully");
        return ResponseEntity.ok(ans);
    }

}