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/*
 * Copyright © 2021-present Arcade Data Ltd ([email protected])
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * SPDX-FileCopyrightText: 2021-present Arcade Data Ltd ([email protected])
 * SPDX-License-Identifier: Apache-2.0
 */
package com.arcadedb.server.security;

import com.arcadedb.database.DatabaseFactory;
import com.arcadedb.log.LogManager;
import com.arcadedb.security.SecurityManager;
import com.arcadedb.serializer.json.JSONArray;
import com.arcadedb.serializer.json.JSONObject;

import java.io.*;
import java.util.*;
import java.util.logging.*;

public class SecurityUserFileRepository {
  public static final  String FILE_NAME        = "server-users.jsonl";
  private static final int    BUFFER_SIZE      = 65536 * 10;
  private final        String securityConfPath;
  private              long   fileLastModified = -1;

  public SecurityUserFileRepository(String securityConfPath) {
    if (!securityConfPath.endsWith(File.separator))
      securityConfPath += File.separator;
    this.securityConfPath = securityConfPath;
  }

  public void save(final List configuration) throws IOException {
    final File file = new File(securityConfPath, FILE_NAME);
    if (!file.exists())
      file.getParentFile().mkdirs();

    try (final FileWriter writer = new FileWriter(file, DatabaseFactory.getDefaultCharset())) {
      for (final JSONObject line : configuration)
        writer.write(line.toString() + "\n");
    }

    fileLastModified = file.lastModified();
  }

  public List getUsers() {
    try {
      return load();
    } catch (final IOException e) {
      LogManager.instance().log(this, Level.SEVERE, "Error on loading file '%s', using default configuration", e, FILE_NAME);
      return createDefault();
    }
  }

  public boolean isUserFileChanged() {
    final File file = new File(securityConfPath, FILE_NAME);
    return file.lastModified() > fileLastModified;
  }

  protected List load() throws IOException {
    final File file = new File(securityConfPath, FILE_NAME);

    final List resultSet = new ArrayList<>();
    if (file.exists()) {
      fileLastModified = file.lastModified();

      try (final InputStreamReader is = new InputStreamReader(new FileInputStream(file));//
          final BufferedReader reader = new BufferedReader(is, BUFFER_SIZE)) {
        while (reader.ready())
          resultSet.add(new JSONObject(reader.readLine()));
      }
    }

    if (!resultSet.isEmpty())
      return resultSet;
    return createDefault();
  }

  public static List createDefault() {
    // ROOT USER
    return Collections.singletonList(new JSONObject().put("name", "root")
        .put("databases", new JSONObject().put(SecurityManager.ANY, new JSONArray(new String[] { "admin" }))));
  }

  public long getFileLastModified() {
    return fileLastModified;
  }
}