/*******************************************************************************
    * Copyright (c) 2010, 2013 Sonatype, Inc.
    * All rights reserved. This program and the accompanying materials
    * are made available under the terms of the Eclipse Public License v1.0
    * which accompanies this distribution, and is available at
    * http://www.eclipse.org/legal/epl-v10.html
    *
    * Contributors:
    *    Sonatype, Inc. - initial API and implementation
   *******************************************************************************/
  package org.eclipse.aether.repository;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.List;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  /**
   * A repository on a remote server.
   */
  public final class RemoteRepository
      implements ArtifactRepository
  {
  
      private static final Pattern URL_PATTERN =
          Pattern.compile( "([^:/]+(:[^:/]{2,}+(?=://))?):(//([^@/]*@)?([^/:]+))?.*" );
  
      private final String id;
  
      private final String type;
  
      private final String url;
  
      private final String host;
  
      private final String protocol;
  
      private final RepositoryPolicy releasePolicy;
  
      private final RepositoryPolicy snapshotPolicy;
  
      private final Proxy proxy;
  
      private final Authentication authentication;
  
      private final List<RemoteRepository> mirroredRepositories;
  
      private final boolean repositoryManager;
  
      RemoteRepository( Builder builder )
      {
          if ( builder.prototype != null )
          {
              id = ( builder.delta & Builder.ID ) != 0 ? builder.id : builder.prototype.id;
              type = ( builder.delta & Builder.TYPE ) != 0 ? builder.type : builder.prototype.type;
              url = ( builder.delta & Builder.URL ) != 0 ? builder.url : builder.prototype.url;
              releasePolicy =
                  ( builder.delta & Builder.RELEASES ) != 0 ? builder.releasePolicy : builder.prototype.releasePolicy;
              snapshotPolicy =
                  ( builder.delta & Builder.SNAPSHOTS ) != 0 ? builder.snapshotPolicy : builder.prototype.snapshotPolicy;
              proxy = ( builder.delta & Builder.PROXY ) != 0 ? builder.proxy : builder.prototype.proxy;
              authentication =
                  ( builder.delta & Builder.AUTH ) != 0 ? builder.authentication : builder.prototype.authentication;
              repositoryManager =
                  ( builder.delta & Builder.REPOMAN ) != 0 ? builder.repositoryManager
                                  : builder.prototype.repositoryManager;
              mirroredRepositories =
                  ( builder.delta & Builder.MIRRORED ) != 0 ? copy( builder.mirroredRepositories )
                                  : builder.prototype.mirroredRepositories;
          }
          else
          {
              id = builder.id;
              type = builder.type;
              url = builder.url;
              releasePolicy = builder.releasePolicy;
              snapshotPolicy = builder.snapshotPolicy;
              proxy = builder.proxy;
              authentication = builder.authentication;
              repositoryManager = builder.repositoryManager;
              mirroredRepositories = copy( builder.mirroredRepositories );
          }
  
          Matcher m = URL_PATTERN.matcher( url );
          if ( m.matches() )
          {
              protocol = m.group( 1 );
              String host = m.group( 5 );
              this.host = ( host != null ) ? host : "";
          }
          else
          {
              protocol = host = "";
          }
      }
  
      private static List<RemoteRepository> copy( List<RemoteRepository> repos )
     {
         if ( repos == null || repos.isEmpty() )
         {
             return Collections.emptyList();
         }
         return Collections.unmodifiableList( Arrays.asList( repos.toArray( new RemoteRepository[repos.size()] ) ) );
     }
 
     public String getId()
     {
         return id;
     }
 
     public String getContentType()
     {
         return type;
     }
 
     /**
      * Gets the (base) URL of this repository.
      * 
      * @return The (base) URL of this repository, never {@code null}.
      */
     public String getUrl()
     {
         return url;
     }
 
     /**
      * Gets the protocol part from the repository's URL, for example {@code file} or {@code http}. As suggested by RFC
      * 2396, section 3.1 "Scheme Component", the protocol name should be treated case-insensitively.
      * 
      * @return The protocol or an empty string if none, never {@code null}.
      */
     public String getProtocol()
     {
         return protocol;
     }
 
     /**
      * Gets the host part from the repository's URL.
      * 
      * @return The host or an empty string if none, never {@code null}.
      */
     public String getHost()
     {
         return host;
     }
 
     /**
      * Gets the policy to apply for snapshot/release artifacts.
      * 
      * @param snapshot {@code true} to retrieve the snapshot policy, {@code false} to retrieve the release policy.
      * @return The requested repository policy, never {@code null}.
      */
     public RepositoryPolicy getPolicy( boolean snapshot )
     {
         return snapshot ? snapshotPolicy : releasePolicy;
     }
 
     /**
      * Gets the proxy that has been selected for this repository.
      * 
      * @return The selected proxy or {@code null} if none.
      */
     public Proxy getProxy()
     {
         return proxy;
     }
 
     /**
      * Gets the authentication that has been selected for this repository.
      * 
      * @return The selected authentication or {@code null} if none.
      */
     public Authentication getAuthentication()
     {
         return authentication;
     }
 
     /**
      * Gets the repositories that this repository serves as a mirror for.
      * 
      * @return The (read-only) repositories being mirrored by this repository, never {@code null}.
      */
     public List<RemoteRepository> getMirroredRepositories()
     {
         return mirroredRepositories;
     }
 
     /**
      * Indicates whether this repository refers to a repository manager or not.
      * 
      * @return {@code true} if this repository is a repository manager, {@code false} otherwise.
      */
     public boolean isRepositoryManager()
     {
         return repositoryManager;
     }
 
     @Override
     public String toString()
     {
         StringBuilder buffer = new StringBuilder( 256 );
         buffer.append( getId() );
         buffer.append( " (" ).append( getUrl() );
         buffer.append( ", " ).append( getContentType() );
         boolean r = getPolicy( false ).isEnabled(), s = getPolicy( true ).isEnabled();
         if ( r && s )
         {
             buffer.append( ", releases+snapshots" );
         }
         else if ( r )
         {
             buffer.append( ", releases" );
         }
         else if ( s )
         {
             buffer.append( ", snapshots" );
         }
         else
         {
             buffer.append( ", disabled" );
         }
         if ( isRepositoryManager() )
         {
             buffer.append( ", managed" );
         }
         buffer.append( ")" );
         return buffer.toString();
     }
 
     @Override
     public boolean equals( Object obj )
     {
         if ( this == obj )
         {
             return true;
         }
         if ( obj == null || !getClass().equals( obj.getClass() ) )
         {
             return false;
         }
 
         RemoteRepository that = (RemoteRepository) obj;
 
         return eq( url, that.url ) && eq( type, that.type ) && eq( id, that.id )
             && eq( releasePolicy, that.releasePolicy ) && eq( snapshotPolicy, that.snapshotPolicy )
             && eq( proxy, that.proxy ) && eq( authentication, that.authentication )
             && eq( mirroredRepositories, that.mirroredRepositories ) && repositoryManager == that.repositoryManager;
     }
 
     private static <T> boolean eq( T s1, T s2 )
     {
         return s1 != null ? s1.equals( s2 ) : s2 == null;
     }
 
     @Override
     public int hashCode()
     {
         int hash = 17;
         hash = hash * 31 + hash( url );
         hash = hash * 31 + hash( type );
         hash = hash * 31 + hash( id );
         hash = hash * 31 + hash( releasePolicy );
         hash = hash * 31 + hash( snapshotPolicy );
         hash = hash * 31 + hash( proxy );
         hash = hash * 31 + hash( authentication );
         hash = hash * 31 + hash( mirroredRepositories );
         hash = hash * 31 + ( repositoryManager ? 1 : 0 );
         return hash;
     }
 
     private static int hash( Object obj )
     {
         return obj != null ? obj.hashCode() : 0;
     }
 
     /**
      * A builder to create remote repositories.
      */
     public static final class Builder
     {
 
         private static final RepositoryPolicy DEFAULT_POLICY = new RepositoryPolicy();
 
         static final int ID = 0x0001, TYPE = 0x0002, URL = 0x0004, RELEASES = 0x0008, SNAPSHOTS = 0x0010,
                         PROXY = 0x0020, AUTH = 0x0040, MIRRORED = 0x0080, REPOMAN = 0x0100;
 
         int delta;
 
         RemoteRepository prototype;
 
         String id;
 
         String type;
 
         String url;
 
         RepositoryPolicy releasePolicy = DEFAULT_POLICY;
 
         RepositoryPolicy snapshotPolicy = DEFAULT_POLICY;
 
         Proxy proxy;
 
         Authentication authentication;
 
         List<RemoteRepository> mirroredRepositories;
 
         boolean repositoryManager;
 
         /**
          * Creates a new repository builder.
          * 
          * @param id The identifier of the repository, may be {@code null}.
          * @param type The type of the repository, may be {@code null}.
          * @param url The (base) URL of the repository, may be {@code null}.
          */
         public Builder( String id, String type, String url )
         {
             this.id = ( id != null ) ? id : "";
             this.type = ( type != null ) ? type : "";
             this.url = ( url != null ) ? url : "";
         }
 
         /**
          * Creates a new repository builder which uses the specified remote repository as a prototype for the new one.
          * All properties which have not been set on the builder will be copied from the prototype when building the
          * repository.
          * 
          * @param prototype The remote repository to use as prototype, must not be {@code null}.
          */
         public Builder( RemoteRepository prototype )
         {
             if ( prototype == null )
             {
                 throw new IllegalArgumentException( "repository prototype missing" );
             }
             this.prototype = prototype;
         }
 
         /**
          * Builds a new remote repository from the current values of this builder. The state of the builder itself
          * remains unchanged.
          * 
          * @return The remote repository, never {@code null}.
          */
         public RemoteRepository build()
         {
             if ( prototype != null && delta == 0 )
             {
                 return prototype;
             }
             return new RemoteRepository( this );
         }
 
         private <T> void delta( int flag, T builder, T prototype )
         {
             boolean equal = ( builder != null ) ? builder.equals( prototype ) : prototype == null;
             if ( equal )
             {
                 delta &= ~flag;
             }
             else
             {
                 delta |= flag;
             }
         }
 
         /**
          * Sets the identifier of the repository.
          * 
          * @param id The identifier of the repository, may be {@code null}.
          * @return This builder for chaining, never {@code null}.
          */
         public Builder setId( String id )
         {
             this.id = ( id != null ) ? id : "";
             if ( prototype != null )
             {
                 delta( ID, this.id, prototype.getId() );
             }
             return this;
         }
 
         /**
          * Sets the type of the repository, e.g. "default".
          * 
          * @param type The type of the repository, may be {@code null}.
          * @return This builder for chaining, never {@code null}.
          */
         public Builder setContentType( String type )
         {
             this.type = ( type != null ) ? type : "";
             if ( prototype != null )
             {
                 delta( TYPE, this.type, prototype.getContentType() );
             }
             return this;
         }
 
         /**
          * Sets the (base) URL of the repository.
          * 
          * @param url The URL of the repository, may be {@code null}.
          * @return This builder for chaining, never {@code null}.
          */
         public Builder setUrl( String url )
         {
             this.url = ( url != null ) ? url : "";
             if ( prototype != null )
             {
                 delta( URL, this.url, prototype.getUrl() );
             }
             return this;
         }
 
         /**
          * Sets the policy to apply for snapshot and release artifacts.
          * 
          * @param policy The repository policy to set, may be {@code null} to use a default policy.
          * @return This builder for chaining, never {@code null}.
          */
         public Builder setPolicy( RepositoryPolicy policy )
         {
             this.releasePolicy = this.snapshotPolicy = ( policy != null ) ? policy : DEFAULT_POLICY;
             if ( prototype != null )
             {
                 delta( RELEASES, this.releasePolicy, prototype.getPolicy( false ) );
                 delta( SNAPSHOTS, this.snapshotPolicy, prototype.getPolicy( true ) );
             }
             return this;
         }
 
         /**
          * Sets the policy to apply for release artifacts.
          * 
          * @param releasePolicy The repository policy to set, may be {@code null} to use a default policy.
          * @return This builder for chaining, never {@code null}.
          */
         public Builder setReleasePolicy( RepositoryPolicy releasePolicy )
         {
             this.releasePolicy = ( releasePolicy != null ) ? releasePolicy : DEFAULT_POLICY;
             if ( prototype != null )
             {
                 delta( RELEASES, this.releasePolicy, prototype.getPolicy( false ) );
             }
             return this;
         }
 
         /**
          * Sets the policy to apply for snapshot artifacts.
          * 
          * @param snapshotPolicy The repository policy to set, may be {@code null} to use a default policy.
          * @return This builder for chaining, never {@code null}.
          */
         public Builder setSnapshotPolicy( RepositoryPolicy snapshotPolicy )
         {
             this.snapshotPolicy = ( snapshotPolicy != null ) ? snapshotPolicy : DEFAULT_POLICY;
             if ( prototype != null )
             {
                 delta( SNAPSHOTS, this.snapshotPolicy, prototype.getPolicy( true ) );
             }
             return this;
         }
 
         /**
          * Sets the proxy to use in order to access the repository.
          * 
          * @param proxy The proxy to use, may be {@code null}.
          * @return This builder for chaining, never {@code null}.
          */
         public Builder setProxy( Proxy proxy )
         {
             this.proxy = proxy;
             if ( prototype != null )
             {
                 delta( PROXY, this.proxy, prototype.getProxy() );
             }
             return this;
         }
 
         /**
          * Sets the authentication to use in order to access the repository.
          * 
          * @param authentication The authentication to use, may be {@code null}.
          * @return This builder for chaining, never {@code null}.
          */
         public Builder setAuthentication( Authentication authentication )
         {
             this.authentication = authentication;
             if ( prototype != null )
             {
                 delta( AUTH, this.authentication, prototype.getAuthentication() );
             }
             return this;
         }
 
         /**
          * Sets the repositories being mirrored by the repository.
          * 
          * @param mirroredRepositories The repositories being mirrored by the repository, may be {@code null}.
          * @return This builder for chaining, never {@code null}.
          */
         public Builder setMirroredRepositories( List<RemoteRepository> mirroredRepositories )
         {
             if ( this.mirroredRepositories == null )
             {
                 this.mirroredRepositories = new ArrayList<RemoteRepository>();
             }
             else
             {
                 this.mirroredRepositories.clear();
             }
             if ( mirroredRepositories != null )
             {
                 this.mirroredRepositories.addAll( mirroredRepositories );
             }
             if ( prototype != null )
             {
                 delta( MIRRORED, this.mirroredRepositories, prototype.getMirroredRepositories() );
             }
             return this;
         }
 
         /**
          * Adds the specified repository to the list of repositories being mirrored by the repository. If this builder
          * was {@link #RemoteRepository.Builder(RemoteRepository) constructed from a prototype}, the given repository
          * will be added to the list of mirrored repositories from the prototype.
          * 
          * @param mirroredRepository The repository being mirrored by the repository, may be {@code null}.
          * @return This builder for chaining, never {@code null}.
          */
         public Builder addMirroredRepository( RemoteRepository mirroredRepository )
         {
             if ( mirroredRepository != null )
             {
                 if ( this.mirroredRepositories == null )
                 {
                     this.mirroredRepositories = new ArrayList<RemoteRepository>();
                     if ( prototype != null )
                     {
                         mirroredRepositories.addAll( prototype.getMirroredRepositories() );
                     }
                 }
                 mirroredRepositories.add( mirroredRepository );
                 if ( prototype != null )
                 {
                     delta |= MIRRORED;
                 }
             }
             return this;
         }
 
         /**
          * Marks the repository as a repository manager or not.
          * 
          * @param repositoryManager {@code true} if the repository points at a repository manager, {@code false} if the
          *            repository is just serving static contents.
          * @return This builder for chaining, never {@code null}.
          */
         public Builder setRepositoryManager( boolean repositoryManager )
         {
             this.repositoryManager = repositoryManager;
             if ( prototype != null )
             {
                 delta( REPOMAN, this.repositoryManager, prototype.isRepositoryManager() );
             }
             return this;
         }
 
     }
 
 }