/*
    * 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.
   */
  package org.apache.maven.scm.provider.hg.repository;
  
  import java.io.File;
  import java.util.Objects;
  
  import org.apache.commons.lang3.StringUtils;
  import org.apache.maven.scm.provider.ScmProviderRepositoryWithHost;
  
  /**
   * @author <a href="mailto:thurner.rupert@ymono.net">thurner rupert</a>
   */
  public class HgScmProviderRepository extends ScmProviderRepositoryWithHost {
      // Known and tested protocols
      private static final String FILE = "";
  
      private static final String SFTP = "sftp://";
  
      private static final String FTP = "ftp://";
  
      private static final String AFTP = "aftp://";
  
      private static final String HTTP = "http://";
  
      private static final String HTTPS = "https://";
  
      private final String path;
  
      private final String protocol;
  
      private final String orgUrl;
  
      public HgScmProviderRepository(String url) {
          orgUrl = url;
          protocol = getProtocol(url);
          path = parseUrl(url);
      }
  
      public String getURI() {
          return protocol + addAuthority() + addHost() + addPort() + addPath();
      }
  
      /**
       * @return a message if the repository as an invalid URI, null if the URI seems fine
       */
      public String validateURI() {
  
          String msg = null;
  
          if (needsAuthentication()) {
              if (getUser() == null) {
                  msg = "Username is missing for protocol " + protocol;
              } else if (getPassword() == null) {
                  msg = "Password is missing for protocol " + protocol;
              } else if (getHost() == null) {
                  msg = "Host (eg. www.myhost.com) is missing for protocol " + protocol;
              }
          } else if (getPort() != 0 && getHost() == null) {
              msg = "Got port information without any host for protocol " + protocol;
          }
  
          if (msg != null) {
              msg = "Something could be wrong about the repository URL: " + orgUrl + "\nReason: " + msg
                      + "\nCheck http://maven.apache.org/scm for usage and hints.";
          }
          return msg;
      }
  
      private String getProtocol(String url) {
          // Assume we have a file unless we find a URL based syntax
          String prot = FILE;
          if (url.startsWith(SFTP)) {
              prot = SFTP;
          } else if (url.startsWith(HTTP)) {
              prot = HTTP;
          } else if (url.startsWith(HTTPS)) {
              prot = HTTPS;
          }
  
          return prot;
      }
  
     private String parseUrl(String url) {
         if (Objects.equals(protocol, FILE)) {
             return url;
         }
 
         // Strip protocol
         url = url.substring(protocol.length());
 
         url = parseUsernameAndPassword(url);
 
         url = parseHostAndPort(url);
 
         url = parsePath(url);
 
         return url; // is now only the path
     }
 
     private String parseHostAndPort(String url) {
         if (!Objects.equals(protocol, FILE)) {
             int indexSlash = url.indexOf('/');
 
             String hostPort = url;
             if (indexSlash > 0) {
                 hostPort = url.substring(0, indexSlash);
                 url = url.substring(indexSlash);
             }
 
             int indexColon = hostPort.indexOf(':');
             if (indexColon > 0) {
                 setHost(hostPort.substring(0, indexColon));
                 setPort(Integer.parseInt(hostPort.substring(indexColon + 1)));
             } else {
                 setHost(hostPort);
             }
         }
 
         return url;
     }
 
     private String parseUsernameAndPassword(String url) {
         if (canAuthenticate()) {
             String[] split = url.split("@");
             if (split.length == 2) {
                 url = split[1]; // Strip away 'username:password@' from url
                 split = split[0].split(":");
                 if (split.length == 2) { // both username and password
                     setUser(split[0]);
                     setPassword(split[1]);
                 } else { // only username
                     setUser(split[0]);
                 }
             }
         }
         return url;
     }
 
     private String parsePath(String url) {
         if (Objects.equals(protocol, FILE)) {
             // Use OS dependent path separator
             url = StringUtils.replace(url, "/", File.separator);
 
             // Test first path separator (*nix systems use them to denote root)
             File tmpFile = new File(url); // most likly a *nix system
             String url2 = url.substring(File.pathSeparator.length());
             File tmpFile2 = new File(url2); // most likly a windows system
             if (!tmpFile.exists() && !tmpFile2.exists()) {
                 // This is trouble - Trouble is reported in validateURI()
             }
 
             url = tmpFile2.exists() ? url2 : url;
         }
 
         return url;
     }
 
     private String addUser() {
         return (getUser() == null) ? "" : getUser();
     }
 
     private String addPassword() {
         return (getPassword() == null) ? "" : ":" + getPassword();
     }
 
     private String addHost() {
         return (getHost() == null) ? "" : getHost();
     }
 
     private String addPort() {
         return (getPort() == 0) ? "" : ":" + getPort();
     }
 
     private String addPath() {
         return path;
     }
 
     private boolean needsAuthentication() {
         return Objects.equals(protocol, SFTP)
                 || Objects.equals(protocol, FTP)
                 || Objects.equals(protocol, HTTPS)
                 || Objects.equals(protocol, AFTP);
     }
 
     private String addAuthority() {
         return ((canAuthenticate() && (getUser() != null)) ? addUser() + addPassword() + "@" : "");
     }
 
     private boolean canAuthenticate() {
         return needsAuthentication() || Objects.equals(protocol, HTTP);
     }
     /**
      * {@inheritDoc}
      */
     public String toString() {
         return "Hg Repository Interpreted from: " + orgUrl + ":\nProtocol: " + protocol + "\nHost: " + getHost()
                 + "\nPort: " + getPort() + "\nUsername: " + getUser() + "\nPassword: " + getPassword() + "\nPath: "
                 + path;
     }
 }