/*
    * ====================================================================
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  
  package org.apache.hc.core5.net;
  
  import java.io.Serializable;
  import java.net.URI;
  import java.net.URISyntaxException;
  import java.util.Objects;
  
  import org.apache.hc.core5.annotation.Contract;
  import org.apache.hc.core5.annotation.ThreadingBehavior;
  import org.apache.hc.core5.util.Args;
  import org.apache.hc.core5.util.LangUtils;
  import org.apache.hc.core5.util.TextUtils;
  import org.apache.hc.core5.util.Tokenizer;
  
  /**
   * Represents authority component of request {@link URI}.
   *
   * @since 5.0
   */
  @Contract(threading = ThreadingBehavior.IMMUTABLE)
  public final class URIAuthority implements NamedEndpoint, Serializable {
  
      private static final long serialVersionUID = 1L;
      private final String userInfo;
      private final Host host;
  
      static URIAuthority parse(final CharSequence s, final Tokenizer.Cursor cursor) throws URISyntaxException {
          final Tokenizer tokenizer = Tokenizer.INSTANCE;
          String userInfo = null;
          final int initPos = cursor.getPos();
          final String token = tokenizer.parseContent(s, cursor, URISupport.HOST_DELIMITERS);
          if (!cursor.atEnd() && s.charAt(cursor.getPos()) == '@') {
              cursor.updatePos(cursor.getPos() + 1);
              if (!TextUtils.isBlank(token)) {
                  userInfo = token;
              }
          } else {
              //Rewind
              cursor.updatePos(initPos);
          }
          final Host host = Host.parse(s, cursor);
          return new URIAuthority(userInfo, host);
      }
  
      static URIAuthority parse(final CharSequence s) throws URISyntaxException {
          final Tokenizer.Cursor cursor = new Tokenizer.Cursor(0, s.length());
          return parse(s, cursor);
      }
  
      static void format(final StringBuilder buf, final URIAuthority uriAuthority) {
          if (uriAuthority.getUserInfo() != null) {
              buf.append(uriAuthority.getUserInfo());
              buf.append("@");
          }
          Host.format(buf, uriAuthority);
      }
  
      static String format(final URIAuthority uriAuthority) {
          final StringBuilder buf = new StringBuilder();
          format(buf, uriAuthority);
          return buf.toString();
      }
  
      /**
       * Constructs a new instance.
       *
       * @throws IllegalArgumentException
       *             If the port parameter is outside the specified range of valid port values, which is between 0 and
       *             65535, inclusive. {@code -1} indicates the scheme default port.
       */
      public URIAuthority(final String userInfo, final String hostname, final int port) {
          super();
         this.userInfo = userInfo;
         this.host = new Host(hostname, port);
     }
 
     public URIAuthority(final String hostname, final int port) {
         this(null, hostname, port);
     }
 
     /**
      * @since 5.2
      */
     public URIAuthority(final String userInfo, final Host host) {
         super();
         Args.notNull(host, "Host");
         this.userInfo = userInfo;
         this.host = host;
     }
 
     /**
      * @since 5.2
      */
     public URIAuthority(final Host host) {
         this(null, host);
     }
 
     /**
      * @since 5.2
      */
     public URIAuthority(final String userInfo, final NamedEndpoint endpoint) {
         super();
         Args.notNull(endpoint, "Endpoint");
         this.userInfo = userInfo;
         this.host = new Host(endpoint.getHostName(), endpoint.getPort());
     }
 
     public URIAuthority(final NamedEndpoint namedEndpoint) {
         this(null, namedEndpoint);
     }
 
     /**
      * Creates a {@code URIAuthority} instance from a string. Text may not contain any blanks.
      *
      * @param s The value to parse
      * @return The parsed URIAuthority.
      * @throws URISyntaxException Thrown if a string could not be parsed as a URIAuthority.
      */
     public static URIAuthority create(final String s) throws URISyntaxException {
         if (TextUtils.isBlank(s)) {
             return null;
         }
         final Tokenizer.Cursor cursor = new Tokenizer.Cursor(0, s.length());
         final URIAuthority uriAuthority = parse(s, cursor);
         if (!cursor.atEnd()) {
             throw URISupport.createException(s, cursor, "Unexpected content");
         }
         return uriAuthority;
     }
 
     public URIAuthority(final String hostname) {
         this(null, hostname, -1);
     }
 
     public String getUserInfo() {
         return userInfo;
     }
 
     @Override
     public String getHostName() {
         return host.getHostName();
     }
 
     @Override
     public int getPort() {
         return host.getPort();
     }
 
     @Override
     public String toString() {
         return format(this);
     }
 
     @Override
     public boolean equals(final Object obj) {
         if (this == obj) {
             return true;
         }
         if (obj instanceof URIAuthority) {
             final URIAuthority that = (URIAuthority) obj;
             return Objects.equals(this.userInfo, that.userInfo) &&
                     Objects.equals(this.host, that.host);
         }
         return false;
     }
 
     @Override
     public int hashCode() {
         int hash = LangUtils.HASH_SEED;
         hash = LangUtils.hashCode(hash, userInfo);
         hash = LangUtils.hashCode(hash, host);
         return hash;
     }
 
 }