/*
    * 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.eclipse.aether.internal.impl;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  import java.util.Map;
  
  import org.eclipse.aether.RepositorySystemSession;
  import org.eclipse.aether.repository.Authentication;
  import org.eclipse.aether.repository.Proxy;
  import org.eclipse.aether.repository.RemoteRepository;
  import org.eclipse.aether.spi.connector.transport.Transporter;
  import org.eclipse.aether.spi.connector.transport.TransporterFactory;
  import org.eclipse.aether.spi.connector.transport.TransporterProvider;
  import org.eclipse.aether.transfer.NoTransporterException;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   */
  @Singleton
  @Named
  public final class DefaultTransporterProvider implements TransporterProvider {
  
      private static final Logger LOGGER = LoggerFactory.getLogger(DefaultTransporterProvider.class);
  
      private final Map<String, TransporterFactory> transporterFactories;
  
      @Inject
      public DefaultTransporterProvider(Map<String, TransporterFactory> transporterFactories) {
          this.transporterFactories = Collections.unmodifiableMap(transporterFactories);
      }
  
      @Override
      public Transporter newTransporter(RepositorySystemSession session, RemoteRepository repository)
              throws NoTransporterException {
          requireNonNull(session, "session cannot be null");
          requireNonNull(repository, "repository cannot be null");
  
          PrioritizedComponents<TransporterFactory> factories = PrioritizedComponents.reuseOrCreate(
                  session, TransporterFactory.class, transporterFactories, TransporterFactory::getPriority);
  
          List<NoTransporterException> errors = new ArrayList<>();
          for (PrioritizedComponent<TransporterFactory> factory : factories.getEnabled()) {
              try {
                  Transporter transporter = factory.getComponent().newInstance(session, repository);
  
                  if (LOGGER.isDebugEnabled()) {
                      StringBuilder buffer = new StringBuilder(256);
                      buffer.append("Using transporter ")
                              .append(transporter.getClass().getSimpleName());
                      Utils.appendClassLoader(buffer, transporter);
                      buffer.append(" with priority ").append(factory.getPriority());
                      buffer.append(" for ").append(repository.getUrl());
  
                      Authentication auth = repository.getAuthentication();
                      if (auth != null) {
                          buffer.append(" with ").append(auth);
                      }
  
                      Proxy proxy = repository.getProxy();
                      if (proxy != null) {
                          buffer.append(" via ")
                                  .append(proxy.getHost())
                                  .append(':')
                                  .append(proxy.getPort());
  
                          auth = proxy.getAuthentication();
                          if (auth != null) {
                              buffer.append(" with ").append(auth);
                          }
                      }
  
                      LOGGER.debug(buffer.toString());
                  }
 
                 return transporter;
             } catch (NoTransporterException e) {
                 // continue and try next factory
                 LOGGER.debug("Could not obtain transporter factory for {}", repository, e);
                 errors.add(e);
             }
         }
 
         StringBuilder buffer = new StringBuilder(256);
         if (factories.isEmpty()) {
             buffer.append("No transporter factories registered");
         } else {
             buffer.append("Cannot access ").append(repository.getUrl());
             buffer.append(" using the registered transporter factories: ");
             factories.list(buffer);
         }
 
         // create exception: if one error, make it cause
         NoTransporterException ex =
                 new NoTransporterException(repository, buffer.toString(), errors.size() == 1 ? errors.get(0) : null);
         // if more errors, make them all suppressed
         if (errors.size() > 1) {
             errors.forEach(ex::addSuppressed);
         }
         throw ex;
     }
 }