package mathpuzzle.service;

import mathpuzzle.entity.User;
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.List;

/**
 * 文件处理器 负责创建用户目录和保存试卷文件
 */
public class FileHandler {

  public void ensureUserDirectory(User user) throws IOException {
    String dirPath = "./" + user.getName();
    Path path = Paths.get(dirPath);
    if (!Files.exists(path)) {
      Files.createDirectories(path);
    }
  }

  public void savePaper(User user, List<String> questions) throws IOException {
    ensureUserDirectory(user);
    // 生成文件名：年-月-日-时-分-秒.txt
    DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd-HH-mm-ss");
    String fileName = LocalDateTime.now().format(formatter) + ".txt";
    String filePath = "./" + user.getName() + "/" + fileName;

    try (BufferedWriter writer = new BufferedWriter(new FileWriter(filePath))) {
      for (int i = 0; i < questions.size(); i++) {
        writer.write((i + 1) + ". " + questions.get(i)); // 添加题号
        writer.newLine();
        writer.newLine(); // 每题之间空一行
      }
    }
  }
}