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/**
 * Copyright (c) 2013, impossibl.com
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *  * 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.
 *  * Neither the name of impossibl.com nor the names of its contributors may
 *    be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS 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 THE COPYRIGHT OWNER OR CONTRIBUTORS 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.impossibl.postgres.api.data;

import static com.impossibl.postgres.utils.guava.Strings.isNullOrEmpty;

import java.util.regex.Matcher;
import java.util.regex.Pattern;



public class ACLItem {

  public String user;
  public String privileges;
  public String grantor;

  public ACLItem(String user, String privileges, String grantor) {
    super();
    this.user = user;
    this.privileges = privileges;
    this.grantor = grantor;
  }

  private ACLItem() {
  }

  @Override
  public String toString() {

    StringBuilder sb = new StringBuilder();

    if (user != null && !user.equals("PUBLIC")) {
      sb.append(user);
    }

    sb.append('=');

    if (privileges != null) {
      sb.append(privileges);
    }

    sb.append('/');

    if (grantor != null) {
      sb.append(grantor);
    }

    return sb.toString();
  }

  private static final Pattern ACL_PATTERN = Pattern.compile("(.*)=(\\w*)/(.*)");

  public static ACLItem parse(String aclItemStr) {

    ACLItem aclItem = null;

    Matcher aclMatcher = ACL_PATTERN.matcher(aclItemStr);
    if (aclMatcher.matches()) {

      aclItem = new ACLItem();

      aclItem.user = aclMatcher.group(1);
      if (isNullOrEmpty(aclItem.user)) {
        aclItem.user = "PUBLIC";
      }

      aclItem.privileges = aclMatcher.group(2);
      aclItem.grantor = aclMatcher.group(3);

    }

    return aclItem;
  }

  @Override
  public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + ((grantor == null) ? 0 : grantor.hashCode());
    result = prime * result + ((privileges == null) ? 0 : privileges.hashCode());
    result = prime * result + ((user == null) ? 0 : user.hashCode());
    return result;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj)
      return true;
    if (obj == null)
      return false;
    if (getClass() != obj.getClass())
      return false;
    ACLItem other = (ACLItem) obj;
    if (grantor == null) {
      if (other.grantor != null)
        return false;
    }
    else if (!grantor.equals(other.grantor))
      return false;
    if (privileges == null) {
      if (other.privileges != null)
        return false;
    }
    else if (!privileges.equals(other.privileges))
      return false;
    if (user == null) {
      if (other.user != null)
        return false;
    }
    else if (!user.equals(other.user))
      return false;
    return true;
  }

}