/*
    * Copyright (C) 2006 The Android Open Source Project
    *
    * 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.
   */
  
  package org.exoplatform.utils;
  
  import static android.util.Patterns.GOOD_IRI_CHAR;
  
  import java.util.Locale;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  /**
   *
   * Web Address Parser
   *
   * This is called WebAddress, rather than URL or URI, because it
   * attempts to parse the stuff that a user will actually type into a
   * browser address widget.
   *
   * Unlike java.net.uri, this parser will not choke on URIs missing
   * schemes.  It will only throw a ParseException if the input is
   * really hosed.
   *
   * If given an https scheme but no port, fills in port
   * 
   * cf https://github.com/android/platform_frameworks_base/blob/master/core/java/android/net/WebAddress.java
   *
   */
  public class ExoWebAddress {
    
    public static class ParseException extends Exception {
      private static final long serialVersionUID = 1L;
      
      public ParseException(String message) {
        super(message);
      }
      
      public ParseException(String message, Throwable source) {
        super(message, source);
      }
    }
  
      private String mScheme;
      private String mHost;
      private int mPort;
      private String mPath;
      private String mAuthInfo;
  
      static final int MATCH_GROUP_SCHEME = 1;
      static final int MATCH_GROUP_AUTHORITY = 2;
      static final int MATCH_GROUP_HOST = 3;
      static final int MATCH_GROUP_PORT = 4;
      static final int MATCH_GROUP_PATH = 5;
  
      static Pattern sAddressPattern = Pattern.compile(
              /* scheme    */ "(?:(" + ExoConstants.HTTP_PROTOCOL + "|" + ExoConstants.HTTPS_PROTOCOL + ")\\:\\/\\/)?" +
              /* authority */ "(?:([-A-Za-z0-9$_.+!*'(),;?&=]+(?:\\:[-A-Za-z0-9$_.+!*'(),;?&=]+)?)@)?" +
              /* host      */ "([" + GOOD_IRI_CHAR + "%_-][" + GOOD_IRI_CHAR + "%_\\.-]*|\\[[0-9a-fA-F:\\.]+\\])?" +
              /* port      */ "(?:\\:([0-9]*))?" +
              /* path      */ "(\\/?[^#]*)?" +
              /* anchor    */ ".*", Pattern.CASE_INSENSITIVE);
  
      /** parses given uriString. 
       * @throws ParseException */
      public ExoWebAddress(String address) throws ParseException {
          if (address == null) {
              throw new ParseException("Cannot create ExoWebAddress from null address parameter");
          }
  
          mScheme = "";
          mHost = "";
          mPort = -1;
          mPath = "/";
          mAuthInfo = "";
  
          Matcher m = sAddressPattern.matcher(address);
          String t;
          if (m.matches()) {
              t = m.group(MATCH_GROUP_SCHEME);
              if (t != null) mScheme = t.toLowerCase(Locale.ROOT);
              t = m.group(MATCH_GROUP_AUTHORITY);
              if (t != null) mAuthInfo = t;
              t = m.group(MATCH_GROUP_HOST);
              if (t != null) mHost = t;
              t = m.group(MATCH_GROUP_PORT);
              if (t != null && t.length() > 0) {
                 // The ':' character is not returned by the regex.
                 try {
                     mPort = Integer.parseInt(t);
                 } catch (NumberFormatException ex) {
                     throw new ParseException("Incorrect port number", ex);
                 }
             }
             t = m.group(MATCH_GROUP_PATH);
             if (t != null && t.length() > 0) {
                 /* handle busted myspace frontpage redirect with
                    missing initial "/" */
                 if (t.charAt(0) == '/') {
                     mPath = t;
                 } else {
                     mPath = "/" + t;
                 }
             }
 
         } else {
             // nothing found... outa here
             throw new ParseException("Incorrect address");
         }
 
         if ("".equals(mScheme)) mScheme = ExoConstants.HTTP_PROTOCOL;
     }
 
     @Override
     public String toString() {
         String port = "";
 
         if (mPort != -1 &&
             ((mPort != 443 && mScheme.equals(ExoConstants.HTTPS_PROTOCOL)) ||
              (mPort != 80 && mScheme.equals(ExoConstants.HTTP_PROTOCOL))
             )) {
             port = ":" + Integer.toString(mPort);
         }
         String authInfo = "";
         if (mAuthInfo.length() > 0) {
             authInfo = mAuthInfo + "@";
         }
 
         return mScheme + "://" + authInfo + mHost + port + mPath;
     }
 
     public void setScheme(String scheme) {
       mScheme = scheme;
     }
 
     public String getScheme() {
       return mScheme;
     }
 
     public void setHost(String host) {
       mHost = host;
     }
 
     public String getHost() {
       return mHost;
     }
 
     public void setPort(int port) {
       mPort = port;
     }
 
     public int getPort() {
       return mPort;
     }
 
     public void setPath(String path) {
       mPath = path;
     }
 
     public String getPath() {
       return mPath;
     }
 
     public void setAuthInfo(String authInfo) {
       mAuthInfo = authInfo;
     }
 
     public String getAuthInfo() {
       return mAuthInfo;
     }
     
     /**
      * @return true if this address has an empty host, false otherwise
      */
     public boolean isRelativeURL() {
       return "".equals(mHost);
     }
 }