/*
 * Copyright (c) 2012-2018 ymnk, JCraft,Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted
 * provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of conditions
 * and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other materials provided with
 * the distribution.
 *
 * 3. The names of the authors may not be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL JCRAFT, INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.jcraft.jsch;

import java.util.Vector;

class LocalIdentityRepository implements IdentityRepository {
  private static final String name = "Local Identity Repository";

  private Vector<Identity> identities = new Vector<>();
  private JSch.InstanceLogger instLogger;

  LocalIdentityRepository(JSch.InstanceLogger instLogger) {
    this.instLogger = instLogger;
  }

  @Override
  public String getName() {
    return name;
  }

  @Override
  public int getStatus() {
    return RUNNING;
  }

  @Override
  public synchronized Vector<Identity> getIdentities() {
    removeDupulicates();
    Vector<Identity> v = new Vector<>();
    for (int i = 0; i < identities.size(); i++) {
      v.addElement(identities.elementAt(i));
    }
    return v;
  }

  public synchronized void add(Identity identity) {
    if (!identities.contains(identity)) {
      byte[] blob1 = identity.getPublicKeyBlob();
      if (blob1 == null) {
        identities.addElement(identity);
        return;
      }
      for (int i = 0; i < identities.size(); i++) {
        byte[] blob2 = identities.elementAt(i).getPublicKeyBlob();
        if (blob2 != null && Util.array_equals(blob1, blob2)) {
          if (!identity.isEncrypted() && identities.elementAt(i).isEncrypted()) {
            remove(blob2);
          } else {
            return;
          }
        }
      }
      identities.addElement(identity);
    }
  }

  @Override
  public synchronized boolean add(byte[] identity) {
    try {
      Identity _identity = IdentityFile.newInstance("from remote:", identity, null, instLogger);
      add(_identity);
      return true;
    } catch (JSchException e) {
      return false;
    }
  }

  synchronized void remove(Identity identity) {
    if (identities.contains(identity)) {
      identities.removeElement(identity);
      identity.clear();
    } else {
      remove(identity.getPublicKeyBlob());
    }
  }

  @Override
  public synchronized boolean remove(byte[] blob) {
    if (blob == null)
      return false;
    for (int i = 0; i < identities.size(); i++) {
      Identity _identity = identities.elementAt(i);
      byte[] _blob = _identity.getPublicKeyBlob();
      if (_blob == null || !Util.array_equals(blob, _blob))
        continue;
      identities.removeElement(_identity);
      _identity.clear();
      return true;
    }
    return false;
  }

  @Override
  public synchronized void removeAll() {
    for (int i = 0; i < identities.size(); i++) {
      Identity identity = identities.elementAt(i);
      identity.clear();
    }
    identities.removeAllElements();
  }

  private void removeDupulicates() {
    Vector<byte[]> v = new Vector<>();
    int len = identities.size();
    if (len == 0)
      return;
    for (int i = 0; i < len; i++) {
      Identity foo = identities.elementAt(i);
      byte[] foo_blob = foo.getPublicKeyBlob();
      if (foo_blob == null)
        continue;
      for (int j = i + 1; j < len; j++) {
        Identity bar = identities.elementAt(j);
        byte[] bar_blob = bar.getPublicKeyBlob();
        if (bar_blob == null)
          continue;
        if (Util.array_equals(foo_blob, bar_blob) && foo.isEncrypted() == bar.isEncrypted()) {
          v.addElement(foo_blob);
          break;
        }
      }
    }
    for (int i = 0; i < v.size(); i++) {
      remove(v.elementAt(i));
    }
  }
}
