// FileManager.java
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.nio.charset.StandardCharsets;
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;

public class FileManager {
  public static final String ROOT_PATH = "./试卷/";

  public void savePaper(User user, List<String> questions) throws IOException {
    String userDirectory = ROOT_PATH + user.getUsername();
    Path userPath = Paths.get(userDirectory);
    if (!Files.exists(userPath)) {
      Files.createDirectories(userPath);
    }

    String fileName = LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd-HH-mm-ss")) + ".txt";
    Path filePath = userPath.resolve(fileName);
    try (PrintWriter writer = new PrintWriter(new FileWriter(filePath.toFile(), StandardCharsets.UTF_8))) {
      for (int index = 0; index < questions.size(); index++) {
        writer.printf("%d. %s%n%n", index + 1, questions.get(index));
      }
    }
  }

  public boolean checkQuestion(String question, User user) throws IOException {
    String userDirectory = ROOT_PATH + user.getUsername();
    Path userPath = Paths.get(userDirectory);
    if (!Files.exists(userPath)) {
      return true;
    } else {
      File directory = new File("./试卷/" + user.getUsername());
      File[] files = directory.listFiles();
      if (files != null) {
        for (File file : files) {
          for (String line : Files.readAllLines(file.toPath())) {
            if (!line.isEmpty()) {
              line = line.replaceFirst("^\\d+\\.\\s*", "");
              if (line.equals(question)) {
                System.out.println("有道一样的题");
                return false;
              }
            }
          }
        }
      }
    }
    return true;
  }
}